Allow DB.MetaPath to be configured (#485)

- Update Go module to v1.19 format
- Docker builder pinned to Go v1.20.1
- Alpine image pinned to 3.17.2 (rather than `latest`)

.github/CONTRIBUTING.md

@@ -1,17 +1,18 @@
-## Open-source, not open-contribution
+## Contribution Policy
 
-[Similar to SQLite](https://www.sqlite.org/copyright.html), Litestream is open
+Initially, Litestream was closed to outside contributions. The goal was to
-source but closed to contributions. This keeps the code base free of proprietary
+reduce burnout by limiting the maintenance overhead of reviewing and validating
-or licensed code but it also helps me continue to maintain and build Litestream.
+third-party code. However, this policy is overly broad and has prevented small,
+easily testable patches from being contributed.
 
-As the author of [BoltDB](https://github.com/boltdb/bolt), I found that
+Litestream is now open to code contributions for bug fixes only. Features carry
-accepting and maintaining third party patches contributed to my burn out and
+a long-term maintenance burden so they will not be accepted at this time.
-I eventually archived the project. Writing databases & low-level replication
+Please [submit an issue][new-issue] if you have a feature you'd like to
-tools involves nuance and simple one line changes can have profound and
+request.
-unexpected changes in correctness and performance. Small contributions
+
-typically required hours of my time to properly test and validate them.
+If you find mistakes in the documentation, please submit a fix to the
+[documentation repository][docs].
+
+[new-issue]: https://github.com/benbjohnson/litestream/issues/new
+[docs]: https://github.com/benbjohnson/litestream.io
 
-I am grateful for community involvement, bug reports, & feature requests. I do
-not wish to come off as anything but welcoming, however, I've
-made the decision to keep this project closed to contributions for my own
-mental health and long term viability of the project.

.github/pull_request_template.md

@@ -1,7 +0,0 @@
-Litestream is not accepting code contributions at this time. You can find a summary of why on the project's GitHub README:
-
-https://github.com/benbjohnson/litestream#open-source-not-open-contribution
-
-Web site & Documentation changes, however, are welcome. You can find that repository here:
-
-https://github.com/benbjohnson/litestream.io

.github/workflows/commit.yml

@@ -0,0 +1,121 @@
+on: push
+
+jobs:
+  build:
+    name: Build & Unit Test
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-go@v2
+        with:
+          go-version: '1.20'
+      - uses: actions/cache@v2
+        with:
+          path: ~/go/pkg/mod
+          key: ${{ inputs.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: ${{ inputs.os }}-go-
+
+      - run: go env
+
+      - run: go install ./cmd/litestream
+
+      - run: go test -v ./...
+
+#      - name: Build integration test
+#        run: go test -c ./integration
+#
+#      - uses: actions/upload-artifact@v2
+#        with:
+#          name: integration.test
+#          path: integration.test
+#          if-no-files-found: error
+
+#  long-running-test:
+#    name: Run Long Running Unit Test
+#    runs-on: ubuntu-22.04
+#    steps:
+#      - uses: actions/checkout@v2
+#      - uses: actions/setup-go@v2
+#        with: 
+#          go-version: '1.20'
+#      - uses: actions/cache@v2
+#        with:
+#          path: ~/go/pkg/mod
+#          key: ${{ inputs.os }}-go-${{ hashFiles('**/go.sum') }}
+#          restore-keys: ${{ inputs.os }}-go-
+#
+#      - run: go install ./cmd/litestream
+#      - run: go test -v -run=TestCmd_Replicate_LongRunning ./integration -long-running-duration 1m
+
+#  s3-integration-test:
+#    name: Run S3 Integration Tests
+#    runs-on: ubuntu-18.04
+#    needs: build
+#    steps:
+#      - uses: actions/download-artifact@v2
+#        with:
+#          name: integration.test
+#      - run: chmod +x integration.test
+#
+#      - run: ./integration.test -test.v -test.run=TestReplicaClient -replica-type s3
+#        env:
+#          LITESTREAM_S3_ACCESS_KEY_ID: ${{ secrets.LITESTREAM_S3_ACCESS_KEY_ID }}
+#          LITESTREAM_S3_SECRET_ACCESS_KEY: ${{ secrets.LITESTREAM_S3_SECRET_ACCESS_KEY }}
+#          LITESTREAM_S3_REGION: us-east-1
+#          LITESTREAM_S3_BUCKET: integration.litestream.io
+
+#  gcp-integration-test:
+#    name: Run GCP Integration Tests
+#    runs-on: ubuntu-18.04
+#    needs: build
+#    steps:
+#      - name: Extract GCP credentials
+#        run: 'echo "$GOOGLE_APPLICATION_CREDENTIALS" > /opt/gcp.json'
+#        shell: bash
+#        env:
+#          GOOGLE_APPLICATION_CREDENTIALS: ${{secrets.GOOGLE_APPLICATION_CREDENTIALS}}
+#
+#      - uses: actions/download-artifact@v2
+#        with:
+#          name: integration.test
+#      - run: chmod +x integration.test
+#
+#      - run: ./integration.test -test.v -test.run=TestReplicaClient -replica-type gcs
+#        env:
+#          GOOGLE_APPLICATION_CREDENTIALS:  /opt/gcp.json
+#          LITESTREAM_GCS_BUCKET:           integration.litestream.io
+
+#  abs-integration-test:
+#    name: Run Azure Blob Store Integration Tests
+#    runs-on: ubuntu-18.04
+#    needs: build
+#    steps:
+#      - uses: actions/download-artifact@v2
+#        with:
+#          name: integration.test
+#      - run: chmod +x integration.test
+#
+#      - run: ./integration.test -test.v -test.run=TestReplicaClient -replica-type abs
+#        env:
+#          LITESTREAM_ABS_ACCOUNT_NAME:     ${{ secrets.LITESTREAM_ABS_ACCOUNT_NAME }}
+#          LITESTREAM_ABS_ACCOUNT_KEY:      ${{ secrets.LITESTREAM_ABS_ACCOUNT_KEY }}
+#          LITESTREAM_ABS_BUCKET:           integration
+
+#  sftp-integration-test:
+#    name: Run SFTP Integration Tests
+#    runs-on: ubuntu-18.04
+#    needs: build
+#    steps:
+#      - name: Extract SSH key
+#        run: 'echo "$LITESTREAM_SFTP_KEY" > /opt/id_ed25519'
+#        shell: bash
+#        env:
+#          LITESTREAM_SFTP_KEY: ${{secrets.LITESTREAM_SFTP_KEY}}
+#
+#      - name: Run sftp tests
+#        run: go test -v -run=TestReplicaClient ./integration -replica-type sftp
+#        env:
+#          LITESTREAM_SFTP_HOST:     ${{ secrets.LITESTREAM_SFTP_HOST }}
+#          LITESTREAM_SFTP_USER:     ${{ secrets.LITESTREAM_SFTP_USER }}
+#          LITESTREAM_SFTP_KEY_PATH: /opt/id_ed25519
+#          LITESTREAM_SFTP_PATH:     ${{ secrets.LITESTREAM_SFTP_PATH }}

.github/workflows/release.docker.yml

@@ -0,0 +1,51 @@
+on:
+  release:
+    types:
+      - published
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+    branches-ignore:
+      - "dependabot/**"
+
+name: Release (Docker)
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    env:
+      PLATFORMS: "linux/amd64,linux/arm64,linux/arm/v7"
+      VERSION: "${{ github.event_name == 'release' && github.event.release.name || github.sha }}"
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: docker/setup-qemu-action@v1
+      - uses: docker/setup-buildx-action@v1
+
+      - uses: docker/login-action@v1
+        with:
+          username: benbjohnson
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      
+      - id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: litestream/litestream
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=sha
+            type=sha,format=long
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+      
+      - uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          platforms: ${{ env.PLATFORMS }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            LITESTREAM_VERSION=${{ env.VERSION }}

.github/workflows/test.yml

@@ -1,62 +0,0 @@
-on: push
-name: test
-jobs:
-  test:
-    runs-on: ubuntu-18.04
-    steps:
-      - uses: actions/setup-go@v2
-        with:
-          go-version: '1.16'
-
-      - uses: actions/checkout@v2
-
-      - uses: actions/cache@v2
-        with:
-          path: ~/go/pkg/mod
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            ${{ runner.os }}-go-
-
-      - name: Extract GCP credentials
-        run: 'echo "$GOOGLE_APPLICATION_CREDENTIALS" > /opt/gcp.json'
-        shell: bash
-        env:
-          GOOGLE_APPLICATION_CREDENTIALS: ${{secrets.GOOGLE_APPLICATION_CREDENTIALS}}
-
-      - name: Extract SSH key
-        run: 'echo "$LITESTREAM_SFTP_KEY" > /opt/id_ed25519'
-        shell: bash
-        env:
-          LITESTREAM_SFTP_KEY: ${{secrets.LITESTREAM_SFTP_KEY}}
-
-      - name: Run unit tests
-        run: go test -v ./...
-
-      - name: Run aws s3 tests
-        run: go test -v -run=TestReplicaClient . -integration s3
-        env:
-          LITESTREAM_S3_ACCESS_KEY_ID:     ${{ secrets.LITESTREAM_S3_ACCESS_KEY_ID }}
-          LITESTREAM_S3_SECRET_ACCESS_KEY: ${{ secrets.LITESTREAM_S3_SECRET_ACCESS_KEY }}
-          LITESTREAM_S3_REGION:            ${{ secrets.LITESTREAM_S3_REGION }}
-          LITESTREAM_S3_BUCKET:            ${{ secrets.LITESTREAM_S3_BUCKET }}
-
-      - name: Run google cloud storage (gcs) tests
-        run: go test -v -run=TestReplicaClient . -integration gcs
-        env:
-          GOOGLE_APPLICATION_CREDENTIALS:  /opt/gcp.json
-          LITESTREAM_GCS_BUCKET:           ${{ secrets.LITESTREAM_GCS_BUCKET }}
-
-      - name: Run azure blob storage (abs) tests
-        run: go test -v -run=TestReplicaClient . -integration abs
-        env:
-          LITESTREAM_ABS_ACCOUNT_NAME:     ${{ secrets.LITESTREAM_ABS_ACCOUNT_NAME }}
-          LITESTREAM_ABS_ACCOUNT_KEY:      ${{ secrets.LITESTREAM_ABS_ACCOUNT_KEY }}
-          LITESTREAM_ABS_BUCKET:           ${{ secrets.LITESTREAM_ABS_BUCKET }}
-
-      - name: Run sftp tests
-        run: go test -v -run=TestReplicaClient . -integration sftp
-        env:
-          LITESTREAM_SFTP_HOST:     ${{ secrets.LITESTREAM_SFTP_HOST }}
-          LITESTREAM_SFTP_USER:     ${{ secrets.LITESTREAM_SFTP_USER }}
-          LITESTREAM_SFTP_KEY_PATH: /opt/id_ed25519
-          LITESTREAM_SFTP_PATH:     ${{ secrets.LITESTREAM_SFTP_PATH }}

Dockerfile

@@ -1,12 +1,16 @@
-FROM golang:1.16 as builder
+FROM golang:1.20.1 as builder
+
 WORKDIR /src/litestream
 COPY . .
+
 ARG LITESTREAM_VERSION=latest
+
 RUN --mount=type=cache,target=/root/.cache/go-build \
 	--mount=type=cache,target=/go/pkg \
 	go build -ldflags "-s -w -X 'main.Version=${LITESTREAM_VERSION}' -extldflags '-static'" -tags osusergo,netgo,sqlite_omit_load_extension -o /usr/local/bin/litestream ./cmd/litestream
 
-FROM alpine
+
+FROM alpine:3.17.2
 COPY --from=builder /usr/local/bin/litestream /usr/local/bin/litestream
 ENTRYPOINT ["/usr/local/bin/litestream"]
 CMD []

README.md

@@ -6,7 +6,7 @@ Litestream
 ![test](https://github.com/benbjohnson/litestream/workflows/test/badge.svg)
 ==========
 
-Litestream is a standalone streaming replication tool for SQLite. It runs as a
+Litestream is a standalone disaster recovery tool for SQLite. It runs as a
 background process and safely replicates changes incrementally to another file
 or S3. Litestream only communicates with SQLite through the SQLite API so it
 will not corrupt your database.
@@ -33,35 +33,29 @@ energy into the project to help make it better:
 
 - Thanks to [Cory LaNou](https://twitter.com/corylanou) for giving early feedback and testing when Litestream was still pre-release.
 - Thanks to [Michael Lynch](https://github.com/mtlynch) for digging into issues and contributing to the documentation.
-- Thanks to [Kurt Mackey](https://twitter.com/mrkurt) for feedback and testing. Also, thanks to fly.io for providing testing resources.
+- Thanks to [Kurt Mackey](https://twitter.com/mrkurt) for feedback and testing.
 - Thanks to [Sam Weston](https://twitter.com/cablespaghetti) for figuring out how to run Litestream on Kubernetes and writing up the docs for it.
 - Thanks to [Rafael](https://github.com/netstx) & [Jungle Boogie](https://github.com/jungle-boogie) for helping to get OpenBSD release builds working.
-- Thanks to [Simon Gottschlag](https://github.com/simongottschlag), [Marin](https://github.com/supermarin),[Victor Björklund](https://github.com/victorbjorklund), [Jonathan Beri](https://twitter.com/beriberikix) [Yuri](https://github.com/yurivish), [Nathan Probst](https://github.com/nprbst), [Yann Coleuu](https://github.com/yanc0), and [Nicholas Grilly](https://twitter.com/ngrilly) for frequent feedback, testing, & support.
+- Thanks to [Simon Gottschlag](https://github.com/simongottschlag), [Marin](https://github.com/supermarin),[Victor Björklund](https://github.com/victorbjorklund), [Jonathan Beri](https://twitter.com/beriberikix) [Yuri](https://github.com/yurivish), [Nathan Probst](https://github.com/nprbst), [Yann Coleu](https://github.com/yanc0), and [Nicholas Grilly](https://twitter.com/ngrilly) for frequent feedback, testing, & support.
+
+Huge thanks to fly.io for their support and for contributing credits for testing and development!
 
 
+## Contribution Policy
 
+Initially, Litestream was closed to outside contributions. The goal was to
+reduce burnout by limiting the maintenance overhead of reviewing and validating
+third-party code. However, this policy is overly broad and has prevented small,
+easily testable patches from being contributed.
 
-## Open-source, not open-contribution
+Litestream is now open to code contributions for bug fixes only. Features carry
+a long-term maintenance burden so they will not be accepted at this time.
+Please [submit an issue][new-issue] if you have a feature you'd like to
+request.
 
-[Similar to SQLite](https://www.sqlite.org/copyright.html), Litestream is open
+If you find mistakes in the documentation, please submit a fix to the
-source but closed to code contributions. This keeps the code base free of
+[documentation repository][docs].
-proprietary or licensed code but it also helps me continue to maintain and build
-Litestream.
 
-As the author of [BoltDB](https://github.com/boltdb/bolt), I found that
+[new-issue]: https://github.com/benbjohnson/litestream/issues/new
-accepting and maintaining third party patches contributed to my burn out and
-I eventually archived the project. Writing databases & low-level replication
-tools involves nuance and simple one line changes can have profound and
-unexpected changes in correctness and performance. Small contributions
-typically required hours of my time to properly test and validate them.
-
-I am grateful for community involvement, bug reports, & feature requests. I do
-not wish to come off as anything but welcoming, however, I've
-made the decision to keep this project closed to contributions for my own
-mental health and long term viability of the project.
-
-The [documentation repository][docs] is MIT licensed and pull requests are welcome there.
-
-[releases]: https://github.com/benbjohnson/litestream/releases
 [docs]: https://github.com/benbjohnson/litestream.io
 

abs/replica_client.go

@@ -102,7 +102,7 @@ func (c *ReplicaClient) Generations(ctx context.Context) ([]string, error) {
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()
 
 		resp, err := c.containerURL.ListBlobsHierarchySegment(ctx, marker, "/", azblob.ListBlobsSegmentOptions{
-			Prefix: path.Join(c.Path, "generations") + "/",
+			Prefix: litestream.GenerationsPath(c.Path) + "/",
 		})
 		if err != nil {
 			return nil, err
@@ -125,17 +125,18 @@ func (c *ReplicaClient) Generations(ctx context.Context) ([]string, error) {
 func (c *ReplicaClient) DeleteGeneration(ctx context.Context, generation string) error {
 	if err := c.Init(ctx); err != nil {
 		return err
-	} else if generation == "" {
-		return fmt.Errorf("generation required")
 	}
 
-	prefix := path.Join(c.Path, "generations", generation) + "/"
+	dir, err := litestream.GenerationPath(c.Path, generation)
+	if err != nil {
+		return fmt.Errorf("cannot determine generation path: %w", err)
+	}
 
 	var marker azblob.Marker
 	for marker.NotDone() {
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()
 
-		resp, err := c.containerURL.ListBlobsFlatSegment(ctx, marker, azblob.ListBlobsSegmentOptions{Prefix: prefix})
+		resp, err := c.containerURL.ListBlobsFlatSegment(ctx, marker, azblob.ListBlobsSegmentOptions{Prefix: dir + "/"})
 		if err != nil {
 			return err
 		}
@@ -170,11 +171,12 @@ func (c *ReplicaClient) Snapshots(ctx context.Context, generation string) (lites
 func (c *ReplicaClient) WriteSnapshot(ctx context.Context, generation string, index int, rd io.Reader) (info litestream.SnapshotInfo, err error) {
 	if err := c.Init(ctx); err != nil {
 		return info, err
-	} else if generation == "" {
-		return info, fmt.Errorf("generation required")
 	}
 
-	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")
+	key, err := litestream.SnapshotPath(c.Path, generation, index)
+	if err != nil {
+		return info, fmt.Errorf("cannot determine snapshot path: %w", err)
+	}
 	startTime := time.Now()
 
 	rc := internal.NewReadCounter(rd)
@@ -204,11 +206,12 @@ func (c *ReplicaClient) WriteSnapshot(ctx context.Context, generation string, in
 func (c *ReplicaClient) SnapshotReader(ctx context.Context, generation string, index int) (io.ReadCloser, error) {
 	if err := c.Init(ctx); err != nil {
 		return nil, err
-	} else if generation == "" {
-		return nil, fmt.Errorf("generation required")
 	}
 
-	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")
+	key, err := litestream.SnapshotPath(c.Path, generation, index)
+	if err != nil {
+		return nil, fmt.Errorf("cannot determine snapshot path: %w", err)
+	}
 
 	blobURL := c.containerURL.NewBlobURL(key)
 	resp, err := blobURL.Download(ctx, 0, 0, azblob.BlobAccessConditions{}, false, azblob.ClientProvidedKeyOptions{})
@@ -228,11 +231,12 @@ func (c *ReplicaClient) SnapshotReader(ctx context.Context, generation string, i
 func (c *ReplicaClient) DeleteSnapshot(ctx context.Context, generation string, index int) error {
 	if err := c.Init(ctx); err != nil {
 		return err
-	} else if generation == "" {
-		return fmt.Errorf("generation required")
 	}
 
-	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")
+	key, err := litestream.SnapshotPath(c.Path, generation, index)
+	if err != nil {
+		return fmt.Errorf("cannot determine snapshot path: %w", err)
+	}
 
 	internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "DELETE").Inc()
 
@@ -257,11 +261,12 @@ func (c *ReplicaClient) WALSegments(ctx context.Context, generation string) (lit
 func (c *ReplicaClient) WriteWALSegment(ctx context.Context, pos litestream.Pos, rd io.Reader) (info litestream.WALSegmentInfo, err error) {
 	if err := c.Init(ctx); err != nil {
 		return info, err
-	} else if pos.Generation == "" {
-		return info, fmt.Errorf("generation required")
 	}
 
-	key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
+	key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
+	if err != nil {
+		return info, fmt.Errorf("cannot determine wal segment path: %w", err)
+	}
 	startTime := time.Now()
 
 	rc := internal.NewReadCounter(rd)
@@ -291,11 +296,12 @@ func (c *ReplicaClient) WriteWALSegment(ctx context.Context, pos litestream.Pos,
 func (c *ReplicaClient) WALSegmentReader(ctx context.Context, pos litestream.Pos) (io.ReadCloser, error) {
 	if err := c.Init(ctx); err != nil {
 		return nil, err
-	} else if pos.Generation == "" {
-		return nil, fmt.Errorf("generation required")
 	}
 
-	key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
+	key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
+	if err != nil {
+		return nil, fmt.Errorf("cannot determine wal segment path: %w", err)
+	}
 
 	blobURL := c.containerURL.NewBlobURL(key)
 	resp, err := blobURL.Download(ctx, 0, 0, azblob.BlobAccessConditions{}, false, azblob.ClientProvidedKeyOptions{})
@@ -318,12 +324,11 @@ func (c *ReplicaClient) DeleteWALSegments(ctx context.Context, a []litestream.Po
 	}
 
 	for _, pos := range a {
-		if pos.Generation == "" {
+		key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
-			return fmt.Errorf("generation required")
+		if err != nil {
+			return fmt.Errorf("cannot determine wal segment path: %w", err)
 		}
 
-		key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
-
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "DELETE").Inc()
 
 		blobURL := c.containerURL.NewBlobURL(key)
@@ -367,24 +372,24 @@ func newSnapshotIterator(ctx context.Context, generation string, client *Replica
 func (itr *snapshotIterator) fetch() error {
 	defer close(itr.ch)
 
-	if itr.generation == "" {
+	dir, err := litestream.SnapshotsPath(itr.client.Path, itr.generation)
-		return fmt.Errorf("generation required")
+	if err != nil {
+		return fmt.Errorf("cannot determine snapshots path: %w", err)
 	}
 
-	prefix := path.Join(itr.client.Path, "generations", itr.generation) + "/"
-
 	var marker azblob.Marker
 	for marker.NotDone() {
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()
 
-		resp, err := itr.client.containerURL.ListBlobsFlatSegment(itr.ctx, marker, azblob.ListBlobsSegmentOptions{Prefix: prefix})
+		resp, err := itr.client.containerURL.ListBlobsFlatSegment(itr.ctx, marker, azblob.ListBlobsSegmentOptions{Prefix: dir + "/"})
 		if err != nil {
 			return err
 		}
 		marker = resp.NextMarker
 
 		for _, item := range resp.Segment.BlobItems {
-			index, err := internal.ParseSnapshotPath(path.Base(item.Name))
+			key := path.Base(item.Name)
+			index, err := litestream.ParseSnapshotPath(key)
 			if err != nil {
 				continue
 			}
@@ -473,24 +478,24 @@ func newWALSegmentIterator(ctx context.Context, generation string, client *Repli
 func (itr *walSegmentIterator) fetch() error {
 	defer close(itr.ch)
 
-	if itr.generation == "" {
+	dir, err := litestream.WALPath(itr.client.Path, itr.generation)
-		return fmt.Errorf("generation required")
+	if err != nil {
+		return fmt.Errorf("cannot determine wal path: %w", err)
 	}
-	prefix := path.Join(itr.client.Path, "generations", itr.generation, "wal")
 
 	var marker azblob.Marker
 	for marker.NotDone() {
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()
 
-		resp, err := itr.client.containerURL.ListBlobsFlatSegment(itr.ctx, marker, azblob.ListBlobsSegmentOptions{Prefix: prefix})
+		resp, err := itr.client.containerURL.ListBlobsFlatSegment(itr.ctx, marker, azblob.ListBlobsSegmentOptions{Prefix: dir + "/"})
 		if err != nil {
 			return err
 		}
 		marker = resp.NextMarker
 
 		for _, item := range resp.Segment.BlobItems {
-			key := strings.TrimPrefix(item.Name, prefix+"/")
+			key := path.Base(item.Name)
-			index, offset, err := internal.ParseWALSegmentPath(key)
+			index, offset, err := litestream.ParseWALSegmentPath(key)
 			if err != nil {
 				continue
 			}

cmd/litestream/main.go

@@ -17,6 +17,7 @@ import (
 	"strings"
 	"time"
 
+	"filippo.io/age"
 	"github.com/benbjohnson/litestream"
 	"github.com/benbjohnson/litestream/abs"
 	"github.com/benbjohnson/litestream/file"
@@ -85,20 +86,17 @@ func (m *Main) Run(ctx context.Context, args []string) (err error) {
 		}
 
 		// Setup signal handler.
-		ctx, cancel := context.WithCancel(ctx)
 		signalCh := signalChan()
 
-		if err := c.Run(ctx); err != nil {
+		if err := c.Run(); err != nil {
 			return err
 		}
 
 		// Wait for signal to stop program.
 		select {
 		case err = <-c.execCh:
-			cancel()
 			fmt.Println("subprocess exited, litestream shutting down")
 		case sig := <-signalCh:
-			cancel()
 			fmt.Println("signal received, litestream shutting down")
 
 			if c.cmd != nil {
@@ -249,6 +247,7 @@ func ReadConfigFile(filename string, expandEnv bool) (_ Config, err error) {
 // DBConfig represents the configuration for a single database.
 type DBConfig struct {
 	Path               string         `yaml:"path"`
+	MetaPath           *string        `yaml:"meta-path"`
 	MonitorInterval    *time.Duration `yaml:"monitor-interval"`
 	CheckpointInterval *time.Duration `yaml:"checkpoint-interval"`
 	MinCheckpointPageN *int           `yaml:"min-checkpoint-page-count"`
@@ -268,6 +267,9 @@ func NewDBFromConfig(dbc *DBConfig) (*litestream.DB, error) {
 	db := litestream.NewDB(path)
 
 	// Override default database settings if specified in configuration.
+	if dbc.MetaPath != nil {
+		db.SetMetaPath(*dbc.MetaPath)
+	}
 	if dbc.MonitorInterval != nil {
 		db.MonitorInterval = *dbc.MonitorInterval
 	}
@@ -323,6 +325,12 @@ type ReplicaConfig struct {
 	User     string `yaml:"user"`
 	Password string `yaml:"password"`
 	KeyPath  string `yaml:"key-path"`
+
+	// Encryption identities and recipients
+	Age struct {
+		Identities []string `yaml:"identities"`
+		Recipients []string `yaml:"recipients"`
+	} `yaml:"age"`
 }
 
 // NewReplicaFromConfig instantiates a replica for a DB based on a config.
@@ -349,6 +357,22 @@ func NewReplicaFromConfig(c *ReplicaConfig, db *litestream.DB) (_ *litestream.Re
 	if v := c.ValidationInterval; v != nil {
 		r.ValidationInterval = *v
 	}
+	for _, str := range c.Age.Identities {
+		identities, err := age.ParseIdentities(strings.NewReader(str))
+		if err != nil {
+			return nil, err
+		}
+
+		r.AgeIdentities = append(r.AgeIdentities, identities...)
+	}
+	for _, str := range c.Age.Recipients {
+		recipients, err := age.ParseRecipients(strings.NewReader(str))
+		if err != nil {
+			return nil, err
+		}
+
+		r.AgeRecipients = append(r.AgeRecipients, recipients...)
+	}
 
 	// Build and set client on replica.
 	switch c.ReplicaType() {

cmd/litestream/replicate.go

@@ -94,7 +94,7 @@ func (c *ReplicateCommand) ParseFlags(ctx context.Context, args []string) (err e
 }
 
 // Run loads all databases specified in the configuration.
-func (c *ReplicateCommand) Run(ctx context.Context) (err error) {
+func (c *ReplicateCommand) Run() (err error) {
 	// Display version information.
 	log.Printf("litestream %s", Version)
 
@@ -162,7 +162,7 @@ func (c *ReplicateCommand) Run(ctx context.Context) (err error) {
 			return fmt.Errorf("cannot parse exec command: %w", err)
 		}
 
-		c.cmd = exec.CommandContext(ctx, execArgs[0], execArgs[1:]...)
+		c.cmd = exec.Command(execArgs[0], execArgs[1:]...)
 		c.cmd.Env = os.Environ()
 		c.cmd.Stdout = os.Stdout
 		c.cmd.Stderr = os.Stderr
@@ -178,7 +178,7 @@ func (c *ReplicateCommand) Run(ctx context.Context) (err error) {
 // Close closes all open databases.
 func (c *ReplicateCommand) Close() (err error) {
 	for _, db := range c.DBs {
-		if e := db.SoftClose(); e != nil {
+		if e := db.Close(); e != nil {
 			log.Printf("error closing db: path=%s err=%s", db.Path(), e)
 			if err == nil {
 				err = e

db.go

@@ -16,8 +16,6 @@ import (
 	"math/rand"
 	"os"
 	"path/filepath"
-	"regexp"
-	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -46,6 +44,7 @@ const BusyTimeout = 1 * time.Second
 type DB struct {
 	mu       sync.RWMutex
 	path     string        // part to database
+	metaPath string        // Path to the database metadata.
 	db       *sql.DB       // target database
 	f        *os.File      // long-running db file descriptor
 	rtx      *sql.Tx       // long running read transaction
@@ -96,18 +95,26 @@ type DB struct {
 	// List of replicas for the database.
 	// Must be set before calling Open().
 	Replicas []*Replica
+
+	// Where to send log messages, defaults to log.Default()
+	Logger *log.Logger
 }
 
 // NewDB returns a new instance of DB for a given path.
 func NewDB(path string) *DB {
+	dir, file := filepath.Split(path)
+
 	db := &DB{
 		path:     path,
+		metaPath: filepath.Join(dir, "."+file+MetaDirSuffix),
 		notify:   make(chan struct{}),
 
 		MinCheckpointPageN: DefaultMinCheckpointPageN,
 		MaxCheckpointPageN: DefaultMaxCheckpointPageN,
 		CheckpointInterval: DefaultCheckpointInterval,
 		MonitorInterval:    DefaultMonitorInterval,
+
+		Logger: log.Default(),
 	}
 
 	db.dbSizeGauge = dbSizeGaugeVec.WithLabelValues(db.path)
@@ -144,20 +151,24 @@ func (db *DB) WALPath() string {
 
 // MetaPath returns the path to the database metadata.
 func (db *DB) MetaPath() string {
-	dir, file := filepath.Split(db.path)
+	return db.metaPath
-	return filepath.Join(dir, "."+file+MetaDirSuffix)
+}
+
+// SetMetaPath sets the path to database metadata.
+func (db *DB) SetMetaPath(mp string) {
+	db.metaPath = mp
 }
 
 // GenerationNamePath returns the path of the name of the current generation.
 func (db *DB) GenerationNamePath() string {
-	return filepath.Join(db.MetaPath(), "generation")
+	return filepath.Join(db.metaPath, "generation")
 }
 
 // GenerationPath returns the path of a single generation.
 // Panics if generation is blank.
 func (db *DB) GenerationPath(generation string) string {
 	assert(generation != "", "generation name required")
-	return filepath.Join(db.MetaPath(), "generations", generation)
+	return filepath.Join(db.metaPath, "generations", generation)
 }
 
 // ShadowWALDir returns the path of the shadow wal directory.
@@ -170,7 +181,7 @@ func (db *DB) ShadowWALDir(generation string) string {
 // Panics if generation is blank or index is negative.
 func (db *DB) ShadowWALPath(generation string, index int) string {
 	assert(index >= 0, "shadow wal index cannot be negative")
-	return filepath.Join(db.ShadowWALDir(generation), FormatIndex(index)+".wal")
+	return filepath.Join(db.ShadowWALDir(generation), FormatWALPath(index))
 }
 
 // CurrentShadowWALPath returns the path to the last shadow WAL in a generation.
@@ -193,8 +204,8 @@ func (db *DB) CurrentShadowWALIndex(generation string) (index int, size int64, e
 
 	// Find highest wal index.
 	for _, fi := range fis {
-		if v, err := parseWALPath(fi.Name()); err != nil {
+		if v, err := ParseWALPath(fi.Name()); err != nil {
-			continue // invalid filename
+			continue // invalid wal filename
 		} else if v > index {
 			index = v
 		}
@@ -280,7 +291,7 @@ func (db *DB) Open() (err error) {
 	}
 
 	// Clear old temporary files that my have been left from a crash.
-	if err := removeTmpFiles(db.MetaPath()); err != nil {
+	if err := removeTmpFiles(db.metaPath); err != nil {
 		return fmt.Errorf("cannot remove tmp files: %w", err)
 	}
 
@@ -293,20 +304,9 @@ func (db *DB) Open() (err error) {
 	return nil
 }
 
-// Close releases the read lock & closes the database. This method should only
+// Close flushes outstanding WAL writes to replicas, releases the read lock,
-// be called by tests as it causes the underlying database to be checkpointed.
+// and closes the database.
 func (db *DB) Close() (err error) {
-	return db.close(false)
-}
-
-// SoftClose closes everything but the underlying db connection. This method
-// is available because the binary needs to avoid closing the database on exit
-// to prevent autocheckpointing.
-func (db *DB) SoftClose() (err error) {
-	return db.close(true)
-}
-
-func (db *DB) close(soft bool) (err error) {
 	db.cancel()
 	db.wg.Wait()
 
@@ -327,7 +327,7 @@ func (db *DB) close(soft bool) (err error) {
 				err = e
 			}
 		}
-		r.Stop(!soft)
+		r.Stop(true)
 	}
 
 	// Release the read lock to allow other applications to handle checkpointing.
@@ -337,9 +337,7 @@ func (db *DB) close(soft bool) (err error) {
 		}
 	}
 
-	// Only perform full close if this is not a soft close.
+	if db.db != nil {
-	// This closes the underlying database connection which can clean up the WAL.
-	if !soft && db.db != nil {
 		if e := db.db.Close(); e != nil && err == nil {
 			err = e
 		}
@@ -394,8 +392,9 @@ func (db *DB) init() (err error) {
 	dsn := db.path
 	dsn += fmt.Sprintf("?_busy_timeout=%d", BusyTimeout.Milliseconds())
 
-	// Connect to SQLite database.
+	// Connect to SQLite database. Use the driver registered with a hook to
-	if db.db, err = sql.Open("sqlite3", dsn); err != nil {
+	// prevent WAL files from being removed.
+	if db.db, err = sql.Open("litestream-sqlite3", dsn); err != nil {
 		return err
 	}
 
@@ -455,13 +454,13 @@ func (db *DB) init() (err error) {
 	}
 
 	// Ensure meta directory structure exists.
-	if err := internal.MkdirAll(db.MetaPath(), db.dirInfo); err != nil {
+	if err := internal.MkdirAll(db.metaPath, db.dirInfo); err != nil {
 		return err
 	}
 
 	// If we have an existing shadow WAL, ensure the headers match.
 	if err := db.verifyHeadersMatch(); err != nil {
-		log.Printf("%s: init: cannot determine last wal position, clearing generation; %s", db.path, err)
+		db.Logger.Printf("%s: init: cannot determine last wal position, clearing generation; %s", db.path, err)
 		if err := os.Remove(db.GenerationNamePath()); err != nil && !os.IsNotExist(err) {
 			return fmt.Errorf("remove generation name: %w", err)
 		}
@@ -531,7 +530,7 @@ func (db *DB) cleanGenerations() error {
 		return err
 	}
 
-	dir := filepath.Join(db.MetaPath(), "generations")
+	dir := filepath.Join(db.metaPath, "generations")
 	fis, err := ioutil.ReadDir(dir)
 	if os.IsNotExist(err) {
 		return nil
@@ -586,7 +585,7 @@ func (db *DB) cleanWAL() error {
 		return err
 	}
 	for _, fi := range fis {
-		if idx, err := parseWALPath(fi.Name()); err != nil || idx >= min {
+		if idx, err := ParseWALPath(fi.Name()); err != nil || idx >= min {
 			continue
 		}
 		if err := os.Remove(filepath.Join(dir, fi.Name())); err != nil {
@@ -661,7 +660,7 @@ func (db *DB) createGeneration() (string, error) {
 	generation := hex.EncodeToString(buf)
 
 	// Generate new directory.
-	dir := filepath.Join(db.MetaPath(), "generations", generation)
+	dir := filepath.Join(db.metaPath, "generations", generation)
 	if err := internal.MkdirAll(dir, db.dirInfo); err != nil {
 		return "", err
 	}
@@ -740,7 +739,7 @@ func (db *DB) Sync(ctx context.Context) (err error) {
 		if info.generation, err = db.createGeneration(); err != nil {
 			return fmt.Errorf("create generation: %w", err)
 		}
-		log.Printf("%s: sync: new generation %q, %s", db.path, info.generation, info.reason)
+		db.Logger.Printf("%s: sync: new generation %q, %s", db.path, info.generation, info.reason)
 
 		// Clear shadow wal info.
 		info.shadowWALPath = db.ShadowWALPath(info.generation, 0)
@@ -930,13 +929,13 @@ func (db *DB) syncWAL(info syncInfo) (newSize int64, err error) {
 
 	// Parse index of current shadow WAL file.
 	dir, base := filepath.Split(info.shadowWALPath)
-	index, err := parseWALPath(base)
+	index, err := ParseWALPath(base)
 	if err != nil {
 		return 0, fmt.Errorf("cannot parse shadow wal filename: %s", base)
 	}
 
 	// Start a new shadow WAL file with next index.
-	newShadowWALPath := filepath.Join(dir, formatWALPath(index+1))
+	newShadowWALPath := filepath.Join(dir, FormatWALPath(index+1))
 	newSize, err = db.initShadowWALFile(newShadowWALPath)
 	if err != nil {
 		return 0, fmt.Errorf("cannot init shadow wal file: name=%s err=%w", newShadowWALPath, err)
@@ -1300,13 +1299,13 @@ func (db *DB) checkpoint(ctx context.Context, generation, mode string) error {
 	}
 
 	// Parse index of current shadow WAL file.
-	index, err := parseWALPath(shadowWALPath)
+	index, err := ParseWALPath(shadowWALPath)
 	if err != nil {
 		return fmt.Errorf("cannot parse shadow wal filename: %s", shadowWALPath)
 	}
 
 	// Start a new shadow WAL file with next index.
-	newShadowWALPath := filepath.Join(filepath.Dir(shadowWALPath), formatWALPath(index+1))
+	newShadowWALPath := filepath.Join(filepath.Dir(shadowWALPath), FormatWALPath(index+1))
 	if _, err := db.initShadowWALFile(newShadowWALPath); err != nil {
 		return fmt.Errorf("cannot init shadow wal file: name=%s err=%w", newShadowWALPath, err)
 	}
@@ -1379,7 +1378,7 @@ func (db *DB) monitor() {
 
 		// Sync the database to the shadow WAL.
 		if err := db.Sync(db.ctx); err != nil && !errors.Is(err, context.Canceled) {
-			log.Printf("%s: sync error: %s", db.path, err)
+			db.Logger.Printf("%s: sync error: %s", db.path, err)
 		}
 	}
 }
@@ -1421,7 +1420,7 @@ func applyWAL(ctx context.Context, index int, dbPath string) error {
 	}
 
 	// Open SQLite database and force a truncating checkpoint.
-	d, err := sql.Open("sqlite3", dbPath)
+	d, err := sql.Open("litestream-sqlite3", dbPath)
 	if err != nil {
 		return err
 	}
@@ -1483,28 +1482,6 @@ func (db *DB) CRC64(ctx context.Context) (uint64, Pos, error) {
 	return h.Sum64(), pos, nil
 }
 
-// parseWALPath returns the index for the WAL file.
-// Returns an error if the path is not a valid WAL path.
-func parseWALPath(s string) (index int, err error) {
-	s = filepath.Base(s)
-
-	a := walPathRegex.FindStringSubmatch(s)
-	if a == nil {
-		return 0, fmt.Errorf("invalid wal path: %s", s)
-	}
-
-	i64, _ := strconv.ParseUint(a[1], 16, 64)
-	return int(i64), nil
-}
-
-// formatWALPath formats a WAL filename with a given index.
-func formatWALPath(index int) string {
-	assert(index >= 0, "wal index must be non-negative")
-	return FormatIndex(index) + ".wal"
-}
-
-var walPathRegex = regexp.MustCompile(`^([0-9a-f]{8})\.wal$`)
-
 // DefaultRestoreParallelism is the default parallelism when downloading WAL files.
 const DefaultRestoreParallelism = 8
 

db_test.go

@@ -270,8 +270,8 @@ func TestDB_Sync(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		// Verify WAL does not exist.
+		// Remove WAL file.
-		if _, err := os.Stat(db.WALPath()); !os.IsNotExist(err) {
+		if err := os.Remove(db.WALPath()); err != nil {
 			t.Fatal(err)
 		}
 

file/replica_client.go

@@ -8,7 +8,6 @@ import (
 	"os"
 	"path/filepath"
 	"sort"
-	"strings"
 
 	"github.com/benbjohnson/litestream"
 	"github.com/benbjohnson/litestream/internal"
@@ -85,7 +84,7 @@ func (c *ReplicaClient) SnapshotPath(generation string, index int) (string, erro
 	if err != nil {
 		return "", err
 	}
-	return filepath.Join(dir, litestream.FormatIndex(index)+".snapshot.lz4"), nil
+	return filepath.Join(dir, litestream.FormatSnapshotPath(index)), nil
 }
 
 // WALDir returns the path to a generation's WAL directory
@@ -103,7 +102,7 @@ func (c *ReplicaClient) WALSegmentPath(generation string, index int, offset int6
 	if err != nil {
 		return "", err
 	}
-	return filepath.Join(dir, litestream.FormatIndex(index), fmt.Sprintf("%08x.wal.lz4", offset)), nil
+	return filepath.Join(dir, litestream.FormatWALSegmentPath(index, offset)), nil
 }
 
 // Generations returns a list of available generation names.
@@ -169,7 +168,7 @@ func (c *ReplicaClient) Snapshots(ctx context.Context, generation string) (lites
 	infos := make([]litestream.SnapshotInfo, 0, len(fis))
 	for _, fi := range fis {
 		// Parse index from filename.
-		index, err := internal.ParseSnapshotPath(filepath.Base(fi.Name()))
+		index, err := litestream.ParseSnapshotPath(fi.Name())
 		if err != nil {
 			continue
 		}
@@ -282,18 +281,26 @@ func (c *ReplicaClient) WALSegments(ctx context.Context, generation string) (lit
 	}
 
 	// Iterate over every file and convert to metadata.
-	indexes := make([]int, 0, len(fis))
+	infos := make([]litestream.WALSegmentInfo, 0, len(fis))
 	for _, fi := range fis {
-		index, err := litestream.ParseIndex(fi.Name())
+		// Parse index from filename.
-		if err != nil || !fi.IsDir() {
+		index, offset, err := litestream.ParseWALSegmentPath(fi.Name())
+		if err != nil {
 			continue
 		}
-		indexes = append(indexes, index)
+
+		infos = append(infos, litestream.WALSegmentInfo{
+			Generation: generation,
+			Index:      index,
+			Offset:     offset,
+			Size:       fi.Size(),
+			CreatedAt:  fi.ModTime().UTC(),
+		})
 	}
 
-	sort.Ints(indexes)
+	sort.Sort(litestream.WALSegmentInfoSlice(infos))
 
-	return newWALSegmentIterator(dir, generation, indexes), nil
+	return litestream.NewWALSegmentInfoSliceIterator(infos), nil
 }
 
 // WriteWALSegment writes LZ4 compressed data from rd into a file on disk.
@@ -372,97 +379,3 @@ func (c *ReplicaClient) DeleteWALSegments(ctx context.Context, a []litestream.Po
 	}
 	return nil
 }
-
-type walSegmentIterator struct {
-	dir        string
-	generation string
-	indexes    []int
-
-	infos []litestream.WALSegmentInfo
-	err   error
-}
-
-func newWALSegmentIterator(dir, generation string, indexes []int) *walSegmentIterator {
-	return &walSegmentIterator{
-		dir:        dir,
-		generation: generation,
-		indexes:    indexes,
-	}
-}
-
-func (itr *walSegmentIterator) Close() (err error) {
-	return itr.err
-}
-
-func (itr *walSegmentIterator) Next() bool {
-	// Exit if an error has already occurred.
-	if itr.err != nil {
-		return false
-	}
-
-	for {
-		// Move to the next segment in cache, if available.
-		if len(itr.infos) > 1 {
-			itr.infos = itr.infos[1:]
-			return true
-		}
-		itr.infos = itr.infos[:0] // otherwise clear infos
-
-		// Move to the next index unless this is the first time initializing.
-		if itr.infos != nil && len(itr.indexes) > 0 {
-			itr.indexes = itr.indexes[1:]
-		}
-
-		// If no indexes remain, stop iteration.
-		if len(itr.indexes) == 0 {
-			return false
-		}
-
-		// Read segments into a cache for the current index.
-		index := itr.indexes[0]
-		f, err := os.Open(filepath.Join(itr.dir, litestream.FormatIndex(index)))
-		if err != nil {
-			itr.err = err
-			return false
-		}
-		defer f.Close()
-
-		fis, err := f.Readdir(-1)
-		if err != nil {
-			itr.err = err
-			return false
-		}
-		for _, fi := range fis {
-			filename := filepath.Base(fi.Name())
-			if fi.IsDir() {
-				continue
-			}
-
-			offset, err := litestream.ParseOffset(strings.TrimSuffix(filename, ".wal.lz4"))
-			if err != nil {
-				continue
-			}
-
-			itr.infos = append(itr.infos, litestream.WALSegmentInfo{
-				Generation: itr.generation,
-				Index:      index,
-				Offset:     offset,
-				Size:       fi.Size(),
-				CreatedAt:  fi.ModTime().UTC(),
-			})
-		}
-
-		if len(itr.infos) > 0 {
-			return true
-		}
-	}
-}
-
-func (itr *walSegmentIterator) Err() error { return itr.err }
-
-func (itr *walSegmentIterator) WALSegment() litestream.WALSegmentInfo {
-	if len(itr.infos) == 0 {
-		return litestream.WALSegmentInfo{}
-	}
-	return itr.infos[0]
-}

file/replica_client_test.go

@@ -118,7 +118,7 @@ func TestReplicaClient_WALSegmentPath(t *testing.T) {
 	t.Run("OK", func(t *testing.T) {
 		if got, err := file.NewReplicaClient("/foo").WALSegmentPath("0123456701234567", 1000, 1001); err != nil {
 			t.Fatal(err)
-		} else if want := "/foo/generations/0123456701234567/wal/000003e8/000003e9.wal.lz4"; got != want {
+		} else if want := "/foo/generations/0123456701234567/wal/000003e8_000003e9.wal.lz4"; got != want {
 			t.Fatalf("WALPath()=%v, want %v", got, want)
 		}
 	})

gcs/replica_client.go

@@ -68,7 +68,7 @@ func (c *ReplicaClient) Generations(ctx context.Context) ([]string, error) {
 	// Construct query to only pull generation directory names.
 	query := &storage.Query{
 		Delimiter: "/",
-		Prefix:    path.Join(c.Path, "generations") + "/",
+		Prefix:    litestream.GenerationsPath(c.Path) + "/",
 	}
 
 	// Loop over results and only build list of generation-formatted names.
@@ -96,15 +96,16 @@ func (c *ReplicaClient) Generations(ctx context.Context) ([]string, error) {
 func (c *ReplicaClient) DeleteGeneration(ctx context.Context, generation string) error {
 	if err := c.Init(ctx); err != nil {
 		return err
-	} else if generation == "" {
-		return fmt.Errorf("generation required")
 	}
 
-	prefix := path.Join(c.Path, "generations", generation) + "/"
+	dir, err := litestream.GenerationPath(c.Path, generation)
+	if err != nil {
+		return fmt.Errorf("cannot determine generation path: %w", err)
+	}
 
 	// Iterate over every object in generation and delete it.
 	internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()
-	for it := c.bkt.Objects(ctx, &storage.Query{Prefix: prefix}); ; {
+	for it := c.bkt.Objects(ctx, &storage.Query{Prefix: dir + "/"}); ; {
 		attrs, err := it.Next()
 		if err == iterator.Done {
 			break
@@ -129,22 +130,24 @@ func (c *ReplicaClient) DeleteGeneration(ctx context.Context, generation string)
 func (c *ReplicaClient) Snapshots(ctx context.Context, generation string) (litestream.SnapshotIterator, error) {
 	if err := c.Init(ctx); err != nil {
 		return nil, err
-	} else if generation == "" {
-		return nil, fmt.Errorf("generation required")
 	}
-	prefix := path.Join(c.Path, "generations", generation) + "/"
+	dir, err := litestream.SnapshotsPath(c.Path, generation)
-	return newSnapshotIterator(generation, c.bkt.Objects(ctx, &storage.Query{Prefix: prefix})), nil
+	if err != nil {
+		return nil, fmt.Errorf("cannot determine snapshots path: %w", err)
+	}
+	return newSnapshotIterator(generation, c.bkt.Objects(ctx, &storage.Query{Prefix: dir + "/"})), nil
 }
 
 // WriteSnapshot writes LZ4 compressed data from rd to the object storage.
 func (c *ReplicaClient) WriteSnapshot(ctx context.Context, generation string, index int, rd io.Reader) (info litestream.SnapshotInfo, err error) {
 	if err := c.Init(ctx); err != nil {
 		return info, err
-	} else if generation == "" {
-		return info, fmt.Errorf("generation required")
 	}
 
-	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")
+	key, err := litestream.SnapshotPath(c.Path, generation, index)
+	if err != nil {
+		return info, fmt.Errorf("cannot determine snapshot path: %w", err)
+	}
 	startTime := time.Now()
 
 	w := c.bkt.Object(key).NewWriter(ctx)
@@ -174,11 +177,12 @@ func (c *ReplicaClient) WriteSnapshot(ctx context.Context, generation string, in
 func (c *ReplicaClient) SnapshotReader(ctx context.Context, generation string, index int) (io.ReadCloser, error) {
 	if err := c.Init(ctx); err != nil {
 		return nil, err
-	} else if generation == "" {
-		return nil, fmt.Errorf("generation required")
 	}
 
-	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")
+	key, err := litestream.SnapshotPath(c.Path, generation, index)
+	if err != nil {
+		return nil, fmt.Errorf("cannot determine snapshot path: %w", err)
+	}
 
 	r, err := c.bkt.Object(key).NewReader(ctx)
 	if isNotExists(err) {
@@ -197,11 +201,12 @@ func (c *ReplicaClient) SnapshotReader(ctx context.Context, generation string, i
 func (c *ReplicaClient) DeleteSnapshot(ctx context.Context, generation string, index int) error {
 	if err := c.Init(ctx); err != nil {
 		return err
-	} else if generation == "" {
-		return fmt.Errorf("generation required")
 	}
 
-	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index), ".snapshot.lz4")
+	key, err := litestream.SnapshotPath(c.Path, generation, index)
+	if err != nil {
+		return fmt.Errorf("cannot determine snapshot path: %w", err)
+	}
 
 	if err := c.bkt.Object(key).Delete(ctx); err != nil && !isNotExists(err) {
 		return fmt.Errorf("cannot delete snapshot %q: %w", key, err)
@@ -215,22 +220,24 @@ func (c *ReplicaClient) DeleteSnapshot(ctx context.Context, generation string, i
 func (c *ReplicaClient) WALSegments(ctx context.Context, generation string) (litestream.WALSegmentIterator, error) {
 	if err := c.Init(ctx); err != nil {
 		return nil, err
-	} else if generation == "" {
-		return nil, fmt.Errorf("generation required")
 	}
-	prefix := path.Join(c.Path, "generations", generation, "wal") + "/"
+	dir, err := litestream.WALPath(c.Path, generation)
-	return newWALSegmentIterator(generation, prefix, c.bkt.Objects(ctx, &storage.Query{Prefix: prefix})), nil
+	if err != nil {
+		return nil, fmt.Errorf("cannot determine wal path: %w", err)
+	}
+	return newWALSegmentIterator(generation, c.bkt.Objects(ctx, &storage.Query{Prefix: dir + "/"})), nil
 }
 
 // WriteWALSegment writes LZ4 compressed data from rd into a file on disk.
 func (c *ReplicaClient) WriteWALSegment(ctx context.Context, pos litestream.Pos, rd io.Reader) (info litestream.WALSegmentInfo, err error) {
 	if err := c.Init(ctx); err != nil {
 		return info, err
-	} else if pos.Generation == "" {
-		return info, fmt.Errorf("generation required")
 	}
 
-	key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
+	key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
+	if err != nil {
+		return info, fmt.Errorf("cannot determine wal segment path: %w", err)
+	}
 	startTime := time.Now()
 
 	w := c.bkt.Object(key).NewWriter(ctx)
@@ -260,11 +267,12 @@ func (c *ReplicaClient) WriteWALSegment(ctx context.Context, pos litestream.Pos,
 func (c *ReplicaClient) WALSegmentReader(ctx context.Context, pos litestream.Pos) (io.ReadCloser, error) {
 	if err := c.Init(ctx); err != nil {
 		return nil, err
-	} else if pos.Generation == "" {
-		return nil, fmt.Errorf("generation required")
 	}
 
-	key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
+	key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
+	if err != nil {
+		return nil, fmt.Errorf("cannot determine wal segment path: %w", err)
+	}
 
 	r, err := c.bkt.Object(key).NewReader(ctx)
 	if isNotExists(err) {
@@ -286,11 +294,11 @@ func (c *ReplicaClient) DeleteWALSegments(ctx context.Context, a []litestream.Po
 	}
 
 	for _, pos := range a {
-		if pos.Generation == "" {
+		key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
-			return fmt.Errorf("generation required")
+		if err != nil {
+			return fmt.Errorf("cannot determine wal segment path: %w", err)
 		}
 
-		key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
 		if err := c.bkt.Object(key).Delete(ctx); err != nil && !isNotExists(err) {
 			return fmt.Errorf("cannot delete wal segment %q: %w", key, err)
 		}
@@ -336,7 +344,7 @@ func (itr *snapshotIterator) Next() bool {
 		}
 
 		// Parse index, otherwise skip to the next object.
-		index, err := internal.ParseSnapshotPath(path.Base(attrs.Name))
+		index, err := litestream.ParseSnapshotPath(path.Base(attrs.Name))
 		if err != nil {
 			continue
 		}
@@ -358,17 +366,15 @@ func (itr *snapshotIterator) Snapshot() litestream.SnapshotInfo { return itr.inf
 
 type walSegmentIterator struct {
 	generation string
-	prefix     string
 
 	it   *storage.ObjectIterator
 	info litestream.WALSegmentInfo
 	err  error
 }
 
-func newWALSegmentIterator(generation, prefix string, it *storage.ObjectIterator) *walSegmentIterator {
+func newWALSegmentIterator(generation string, it *storage.ObjectIterator) *walSegmentIterator {
 	return &walSegmentIterator{
 		generation: generation,
-		prefix:     prefix,
 		it:         it,
 	}
 }
@@ -394,7 +400,7 @@ func (itr *walSegmentIterator) Next() bool {
 		}
 
 		// Parse index & offset, otherwise skip to the next object.
-		index, offset, err := internal.ParseWALSegmentPath(strings.TrimPrefix(attrs.Name, itr.prefix))
+		index, offset, err := litestream.ParseWALSegmentPath(path.Base(attrs.Name))
 		if err != nil {
 			continue
 		}

go.mod

@@ -1,21 +1,51 @@
 module github.com/benbjohnson/litestream
 
-go 1.16
+go 1.19
 
 require (
-	cloud.google.com/go/storage v1.15.0
+	cloud.google.com/go/storage v1.24.0
-	github.com/Azure/azure-storage-blob-go v0.13.0 // indirect
+	filippo.io/age v1.1.1
-	github.com/Azure/go-autorest/autorest v0.9.0 // indirect
+	github.com/Azure/azure-storage-blob-go v0.15.0
-	github.com/aws/aws-sdk-go v1.27.0
+	github.com/aws/aws-sdk-go v1.44.71
-	github.com/davecgh/go-spew v1.1.1
+	github.com/mattn/go-shellwords v1.0.12
-	github.com/mattn/go-shellwords v1.0.11 // indirect
+	github.com/mattn/go-sqlite3 v1.14.14
-	github.com/mattn/go-sqlite3 v1.14.5
+	github.com/pierrec/lz4/v4 v4.1.15
-	github.com/pierrec/lz4/v4 v4.1.3
+	github.com/pkg/sftp v1.13.5
-	github.com/pkg/sftp v1.13.0 // indirect
+	github.com/prometheus/client_golang v1.13.0
-	github.com/prometheus/client_golang v1.9.0
+	golang.org/x/crypto v0.4.0
-	golang.org/x/crypto v0.0.0-20210513164829-c07d793c2f9a // indirect
+	golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4
-	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
+	golang.org/x/sys v0.3.0
-	golang.org/x/sys v0.0.0-20210412220455-f1c623a9e750
+	google.golang.org/api v0.91.0
-	google.golang.org/api v0.45.0
 	gopkg.in/yaml.v2 v2.4.0
 )
+
+require (
+	cloud.google.com/go v0.103.0 // indirect
+	cloud.google.com/go/compute v1.7.0 // indirect
+	cloud.google.com/go/iam v0.3.0 // indirect
+	github.com/Azure/azure-pipeline-go v0.2.3 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/google/go-cmp v0.5.8 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.1.0 // indirect
+	github.com/googleapis/gax-go/v2 v2.5.1 // indirect
+	github.com/jmespath/go-jmespath v0.4.0 // indirect
+	github.com/kr/fs v0.1.0 // indirect
+	github.com/mattn/go-ieproxy v0.0.7 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/common v0.37.0 // indirect
+	github.com/prometheus/procfs v0.8.0 // indirect
+	go.opencensus.io v0.23.0 // indirect
+	golang.org/x/net v0.3.0 // indirect
+	golang.org/x/oauth2 v0.0.0-20220808172628-8227340efae7 // indirect
+	golang.org/x/text v0.5.0 // indirect
+	golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f // indirect
+	google.golang.org/appengine v1.6.7 // indirect
+	google.golang.org/genproto v0.0.0-20220808204814-fd01256a5276 // indirect
+	google.golang.org/grpc v1.48.0 // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
+)

go.sum

@@ -17,16 +17,37 @@ cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKP
 cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk=
 cloud.google.com/go v0.78.0/go.mod h1:QjdrLG0uq+YwhjoVOLsS1t7TW8fs36kLs4XO5R5ECHg=
 cloud.google.com/go v0.79.0/go.mod h1:3bzgcEeQlzbuEAYu4mrWhKqWjmpprinYgKJLgKHnbb8=
-cloud.google.com/go v0.81.0 h1:at8Tk2zUz63cLPR0JPWm5vp77pEZmzxEQBEfRKn1VV8=
 cloud.google.com/go v0.81.0/go.mod h1:mk/AM35KwGk/Nm2YSeZbxXdrNK3KZOYHmLkOqC2V6E0=
+cloud.google.com/go v0.83.0/go.mod h1:Z7MJUsANfY0pYPdw0lbnivPx4/vhy/e2FEkSkF7vAVY=
+cloud.google.com/go v0.84.0/go.mod h1:RazrYuxIK6Kb7YrzzhPoLmCVzl7Sup4NrbKPg8KHSUM=
+cloud.google.com/go v0.87.0/go.mod h1:TpDYlFy7vuLzZMMZ+B6iRiELaY7z/gJPaqbMx6mlWcY=
+cloud.google.com/go v0.90.0/go.mod h1:kRX0mNRHe0e2rC6oNakvwQqzyDmg57xJ+SZU1eT2aDQ=
+cloud.google.com/go v0.93.3/go.mod h1:8utlLll2EF5XMAV15woO4lSbWQlk8rer9aLOfLh7+YI=
+cloud.google.com/go v0.94.1/go.mod h1:qAlAugsXlC+JWO+Bke5vCtc9ONxjQT3drlTTnAplMW4=
+cloud.google.com/go v0.97.0/go.mod h1:GF7l59pYBVlXQIBLx3a761cZ41F9bBH3JUlihCt2Udc=
+cloud.google.com/go v0.99.0/go.mod h1:w0Xx2nLzqWJPuozYQX+hFfCSI8WioryfRDzkoI/Y2ZA=
+cloud.google.com/go v0.100.2/go.mod h1:4Xra9TjzAeYHrl5+oeLlzbM2k3mjVhZh4UqTZ//w99A=
+cloud.google.com/go v0.102.0/go.mod h1:oWcCzKlqJ5zgHQt9YsaeTY9KzIvjyy0ArmiBUgpQ+nc=
+cloud.google.com/go v0.102.1/go.mod h1:XZ77E9qnTEnrgEOvr4xzfdX5TRo7fB4T2F4O6+34hIU=
+cloud.google.com/go v0.103.0 h1:YXtxp9ymmZjlGzxV7VrYQ8aaQuAgcqxSy6YhDX4I458=
+cloud.google.com/go v0.103.0/go.mod h1:vwLx1nqLrzLX/fpwSMOXmFIqBOyHsvHbnAdbGSJ+mKk=
 cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
 cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
 cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
 cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
 cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
 cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
+cloud.google.com/go/compute v0.1.0/go.mod h1:GAesmwr110a34z04OlxYkATPBEfVhkymfTBXtfbBFow=
+cloud.google.com/go/compute v1.3.0/go.mod h1:cCZiE1NHEtai4wiufUhW8I8S1JKkAnhnQJWM7YD99wM=
+cloud.google.com/go/compute v1.5.0/go.mod h1:9SMHyhJlzhlkJqrPAc839t2BZFTSk6Jdj6mkzQJeu0M=
+cloud.google.com/go/compute v1.6.0/go.mod h1:T29tfhtVbq1wvAPo0E3+7vhgmkOYeXjhFvz/FMzPu0s=
+cloud.google.com/go/compute v1.6.1/go.mod h1:g85FgpzFvNULZ+S8AYq87axRKuf2Kh7deLqV/jJ3thU=
+cloud.google.com/go/compute v1.7.0 h1:v/k9Eueb8aAJ0vZuxKMrgm6kPhCLZU9HxFU+AFDs9Uk=
+cloud.google.com/go/compute v1.7.0/go.mod h1:435lt8av5oL9P3fv1OEzSbSUe+ybHXGMPQHHZWZxy9U=
 cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
 cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
+cloud.google.com/go/iam v0.3.0 h1:exkAomrVUuzx9kWFI1wm3KI0uoDeUFPB4kKGzx6x+Gc=
+cloud.google.com/go/iam v0.3.0/go.mod h1:XzJPvDayI+9zsASAFO68Hk07u3z+f+JrT2xXNdp4bnY=
 cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
 cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
 cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
@@ -36,115 +57,96 @@ cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0Zeo
 cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
 cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
 cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
-cloud.google.com/go/storage v1.15.0 h1:Ljj+ZXVEhCr/1+4ZhvtteN1ND7UUsNTlduGclLh8GO0=
+cloud.google.com/go/storage v1.22.1/go.mod h1:S8N1cAStu7BOeFfE8KAQzmyyLkK8p/vmRq6kuBTW58Y=
-cloud.google.com/go/storage v1.15.0/go.mod h1:mjjQMoxxyGH7Jr8K5qrx6N2O0AHsczI61sMNn03GIZI=
+cloud.google.com/go/storage v1.23.0/go.mod h1:vOEEDNFnciUMhBeT6hsJIn3ieU5cFRmzeLgDvXzfIXc=
+cloud.google.com/go/storage v1.24.0 h1:a4N0gIkx83uoVFGz8B2eAV3OhN90QoWF5OZWLKl39ig=
+cloud.google.com/go/storage v1.24.0/go.mod h1:3xrJEFMXBsQLgxwThyjuD3aYlroL0TMRec1ypGUQ0KE=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+filippo.io/age v1.1.1 h1:pIpO7l151hCnQ4BdyBujnGP2YlUo0uj6sAVNHGBvXHg=
+filippo.io/age v1.1.1/go.mod h1:l03SrzDUrBkdBx8+IILdnn2KZysqQdbEBUQ4p3sqEQE=
 github.com/Azure/azure-pipeline-go v0.2.3 h1:7U9HBg1JFK3jHl5qmo4CTZKFTVgMwdFHMVtCdfBE21U=
 github.com/Azure/azure-pipeline-go v0.2.3/go.mod h1:x841ezTBIMG6O3lAcl8ATHnsOPVl2bqk7S3ta6S6u4k=
-github.com/Azure/azure-storage-blob-go v0.13.0 h1:lgWHvFh+UYBNVQLFHXkvul2f6yOPA9PIH82RTG2cSwc=
+github.com/Azure/azure-storage-blob-go v0.15.0 h1:rXtgp8tN1p29GvpGgfJetavIG0V7OgcSXPpwp3tx6qk=
-github.com/Azure/azure-storage-blob-go v0.13.0/go.mod h1:pA9kNqtjUeQF2zOSu4s//nUdBD+e64lEuc4sVnuOfNs=
+github.com/Azure/azure-storage-blob-go v0.15.0/go.mod h1:vbjsVbX0dlxnRc4FFMPsS9BsJWPcne7GB7onqlPvz58=
+github.com/Azure/go-autorest v14.2.0+incompatible h1:V5VMDjClD3GiElqLWO7mz2MxNAK/vTfRHdAubSIPRgs=
 github.com/Azure/go-autorest v14.2.0+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
-github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
+github.com/Azure/go-autorest/autorest/adal v0.9.13 h1:Mp5hbtOePIzM8pJVRa3YLrWWmZtoxRXqUEzCfJt3+/Q=
-github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0=
+github.com/Azure/go-autorest/autorest/adal v0.9.13/go.mod h1:W/MM4U6nLxnIskrw4UwWzlHfGjwUS50aOsc/I3yuU8M=
-github.com/Azure/go-autorest/autorest/adal v0.9.2/go.mod h1:/3SMAM86bP6wC9Ev35peQDUeqFZBMH07vvUOmg4z/fE=
+github.com/Azure/go-autorest/autorest/date v0.3.0 h1:7gUk1U5M/CQbp9WoqinNzJar+8KY+LPI6wiWrP/myHw=
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@@ -153,6 +155,7 @@ github.com/golang/mock v1.4.1/go.mod h1:UOMv5ysSaYNkG+OFQykRIcU/QvvxJf3p21QfJ2Bt
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@@ -166,13 +169,12 @@ github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:W
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-github.com/spf13/pflag v1.0.1/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
-github.com/streadway/amqp v0.0.0-20190404075320-75d898a42a94/go.mod h1:AZpEONHx3DKn8O/DFsRAY58/XVQiIPMTMB1SddzLXVw=
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-github.com/streadway/handy v0.0.0-20190108123426-d5acb3125c2a/go.mod h1:qNTQ5P5JnDBl6z3cMAg/SywNDC5ABu5ApDIw6lUbRmI=
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@@ -392,18 +325,13 @@ github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UV
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
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+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
-github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
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-github.com/urfave/cli v1.22.1/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
-github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
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 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
-go.etcd.io/bbolt v1.3.3/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
+github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
-go.etcd.io/etcd v0.0.0-20191023171146-3cf2f69b5738/go.mod h1:dnLIgRNXwCJa5e+c6mIZCrds/GIG4ncV9HhK5PX7jPg=
-go.opencensus.io v0.20.1/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
-go.opencensus.io v0.20.2/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
 go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
 go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8=
 go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
@@ -412,25 +340,18 @@ go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.5/go.mod h1:5pWMHQbX5EPX2/62yrJeAkowc+lfs/XD7Uxpq3pI6kk=
 go.opencensus.io v0.23.0 h1:gqCw0LfLxScz8irSi8exQc7fyQ0fKQU/qnC/X8+V/1M=
 go.opencensus.io v0.23.0/go.mod h1:XItmlyltB5F7CS4xOC1DcqMoFqwtC6OG2xF7mCv7P7E=
-go.uber.org/atomic v1.3.2/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
+go.opentelemetry.io/proto/otlp v0.7.0/go.mod h1:PqfVotwruBrMGOCsRd/89rSnXhoiJIqeYNgFYFoEGnI=
-go.uber.org/atomic v1.5.0/go.mod h1:sABNBOSYdrvTF6hTgEIbc7YasKWGhgEQZyfxyTvoXHQ=
-go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
-go.uber.org/multierr v1.3.0/go.mod h1:VgVr7evmIr6uPjLBxg28wmKNXyqE9akIJ5XnfpiKl+4=
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-go.uber.org/zap v1.13.0/go.mod h1:zwrFLgMcdUuIBviXEYEH1YKNaOBnKXsx2IPda5bBwHM=
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+golang.org/x/crypto v0.4.0/go.mod h1:3quD/ATkf6oY+rnes5c3ExXTbLc8mueNue5/DoinL80=
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@@ -453,8 +374,8 @@ golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHl
 golang.org/x/lint v0.0.0-20191125180803-fdd1cda4f05f/go.mod h1:5qLYkcX4OjUUV8bRuDixDT3tpyyb+LUpUlRWLxfhWrs=
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@@ -464,17 +385,12 @@ golang.org/x/mod v0.1.1-0.20191107180719-034126e5016b/go.mod h1:QqPTAvyqsEbceGzB
 golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
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-golang.org/x/mod v0.4.1 h1:Kvvh58BN8Y9/lBi7hTekvtMpm07eUZ0ck5pRHpsMWrY=
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+golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
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-golang.org/x/net v0.0.0-20181220203305-927f97764cc3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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-golang.org/x/net v0.0.0-20190125091013-d26f9f9a57f3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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@@ -485,7 +401,6 @@ golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190628185345-da137c7871d7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190724013045-ca1201d0de80/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191112182307-2180aed22343/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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@@ -507,8 +422,23 @@ golang.org/x/net v0.0.0-20201110031124-69a78807bb2b/go.mod h1:sp8m0HH+o8qH0wwXwY
 golang.org/x/net v0.0.0-20201209123823-ac852fbbde11/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210119194325-5f4716e94777/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
-golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4 h1:b0LrWgu8+q7z4J+0Y3Umo5q1dL7NXBkKBWkaVkAq17E=
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@@ -520,8 +450,18 @@ golang.org/x/oauth2 v0.0.0-20201208152858-08078c50e5b5/go.mod h1:KelEdhl1UZF7XfJ
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@@ -532,16 +472,13 @@ golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a/go.mod h1:RxMgew5VJxzue5/jJ
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@@ -551,12 +488,9 @@ golang.org/x/sys v0.0.0-20190507160741-ecd444e8653b/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -574,44 +508,70 @@ golang.org/x/sys v0.0.0-20200523222454-059865788121/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -621,8 +581,6 @@ golang.org/x/tools v0.0.0-20190628153133-6cdbf07be9d0/go.mod h1:/rFqwRUd4F7ZHNgw
 golang.org/x/tools v0.0.0-20190816200558-6889da9d5479/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
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@@ -630,7 +588,6 @@ golang.org/x/tools v0.0.0-20191125144606-a911d9008d1f/go.mod h1:b+2E5dAYhXwXZwtn
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@@ -683,10 +646,29 @@ google.golang.org/api v0.36.0/go.mod h1:+z5ficQTmoYpPn8LCUNVpK5I7hwkpjbcgqA7I34q
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-google.golang.org/appengine v1.2.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
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@@ -699,7 +681,6 @@ google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRn
 google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
 google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
 google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
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 google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
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@@ -718,6 +699,7 @@ google.golang.org/genproto v0.0.0-20200312145019-da6875a35672/go.mod h1:55QSHmfG
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-gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
-gopkg.in/gcfg.v1 v1.2.3/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
-gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
-gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
-gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
@@ -809,5 +837,3 @@ honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
-sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
-sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=

internal/internal.go

@@ -1,11 +1,8 @@
 package internal
 
 import (
-	"fmt"
 	"io"
 	"os"
-	"regexp"
-	"strconv"
 	"syscall"
 
 	"github.com/prometheus/client_golang/prometheus"
@@ -130,33 +127,6 @@ func MkdirAll(path string, fi os.FileInfo) error {
 	return nil
 }
 
-// ParseSnapshotPath parses the index from a snapshot filename. Used by path-based replicas.
-func ParseSnapshotPath(s string) (index int, err error) {
-	a := snapshotPathRegex.FindStringSubmatch(s)
-	if a == nil {
-		return 0, fmt.Errorf("invalid snapshot path")
-	}
-
-	i64, _ := strconv.ParseUint(a[1], 16, 64)
-	return int(i64), nil
-}
-
-var snapshotPathRegex = regexp.MustCompile(`^([0-9a-f]{8})\.snapshot\.lz4$`)
-
-// ParseWALSegmentPath parses the index/offset from a segment filename. Used by path-based replicas.
-func ParseWALSegmentPath(s string) (index int, offset int64, err error) {
-	a := walSegmentPathRegex.FindStringSubmatch(s)
-	if a == nil {
-		return 0, 0, fmt.Errorf("invalid wal segment path")
-	}
-
-	i64, _ := strconv.ParseUint(a[1], 16, 64)
-	off64, _ := strconv.ParseUint(a[2], 16, 64)
-	return int(i64), int64(off64), nil
-}
-
-var walSegmentPathRegex = regexp.MustCompile(`^([0-9a-f]{8})\/([0-9a-f]{8})\.wal\.lz4$`)
-
 // Shared replica metrics.
 var (
 	OperationTotalCounterVec = promauto.NewCounterVec(prometheus.CounterOpts{

internal/internal_test.go

@@ -1,61 +0,0 @@
-package internal_test
-
-import (
-	"fmt"
-	"reflect"
-	"testing"
-
-	"github.com/benbjohnson/litestream/internal"
-)
-
-func TestParseSnapshotPath(t *testing.T) {
-	for _, tt := range []struct {
-		s     string
-		index int
-		err   error
-	}{
-		{"00bc614e.snapshot.lz4", 12345678, nil},
-		{"xxxxxxxx.snapshot.lz4", 0, fmt.Errorf("invalid snapshot path")},
-		{"00bc614.snapshot.lz4", 0, fmt.Errorf("invalid snapshot path")},
-		{"00bc614e.snapshot.lz", 0, fmt.Errorf("invalid snapshot path")},
-		{"00bc614e.snapshot", 0, fmt.Errorf("invalid snapshot path")},
-		{"00bc614e", 0, fmt.Errorf("invalid snapshot path")},
-		{"", 0, fmt.Errorf("invalid snapshot path")},
-	} {
-		t.Run("", func(t *testing.T) {
-			index, err := internal.ParseSnapshotPath(tt.s)
-			if got, want := index, tt.index; got != want {
-				t.Errorf("index=%#v, want %#v", got, want)
-			} else if got, want := err, tt.err; !reflect.DeepEqual(got, want) {
-				t.Errorf("err=%#v, want %#v", got, want)
-			}
-		})
-	}
-}
-
-func TestParseWALSegmentPath(t *testing.T) {
-	for _, tt := range []struct {
-		s      string
-		index  int
-		offset int64
-		err    error
-	}{
-		{"00bc614e/000003e8.wal.lz4", 12345678, 1000, nil},
-		{"00000000/00000000.wal", 0, 0, fmt.Errorf("invalid wal segment path")},
-		{"00000000/00000000", 0, 0, fmt.Errorf("invalid wal segment path")},
-		{"00000000/", 0, 0, fmt.Errorf("invalid wal segment path")},
-		{"00000000", 0, 0, fmt.Errorf("invalid wal segment path")},
-		{"", 0, 0, fmt.Errorf("invalid wal segment path")},
-	} {
-		t.Run("", func(t *testing.T) {
-			index, offset, err := internal.ParseWALSegmentPath(tt.s)
-			if got, want := index, tt.index; got != want {
-				t.Errorf("index=%#v, want %#v", got, want)
-			} else if got, want := offset, tt.offset; got != want {
-				t.Errorf("offset=%#v, want %#v", got, want)
-			} else if got, want := err, tt.err; !reflect.DeepEqual(got, want) {
-				t.Errorf("err=%#v, want %#v", got, want)
-			}
-		})
-	}
-}

litestream.go

@@ -7,10 +7,14 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"path"
 	"path/filepath"
+	"regexp"
 	"strconv"
 	"strings"
 	"time"
+
+	"github.com/mattn/go-sqlite3"
 )
 
 // Naming constants.
@@ -40,6 +44,25 @@ var (
 	ErrChecksumMismatch = errors.New("invalid replica, checksum mismatch")
 )
 
+var (
+	// LogWriter is the destination writer for all logging.
+	LogWriter = os.Stdout
+
+	// LogFlags are the flags passed to log.New().
+	LogFlags = 0
+)
+
+func init() {
+	sql.Register("litestream-sqlite3", &sqlite3.SQLiteDriver{
+		ConnectHook: func(conn *sqlite3.SQLiteConn) error {
+			if err := conn.SetFileControlInt("main", sqlite3.SQLITE_FCNTL_PERSIST_WAL, 1); err != nil {
+				return fmt.Errorf("cannot set file control: %w", err)
+			}
+			return nil
+		},
+	})
+}
+
 // SnapshotIterator represents an iterator over a collection of snapshot metadata.
 type SnapshotIterator interface {
 	io.Closer
@@ -205,11 +228,13 @@ func FilterSnapshotsAfter(a []SnapshotInfo, t time.Time) []SnapshotInfo {
 // FindMinSnapshotByGeneration finds the snapshot with the lowest index in a generation.
 func FindMinSnapshotByGeneration(a []SnapshotInfo, generation string) *SnapshotInfo {
 	var min *SnapshotInfo
-	for _, snapshot := range a {
+	for i := range a {
+		snapshot := &a[i]
+
 		if snapshot.Generation != generation {
 			continue
 		} else if min == nil || snapshot.Index < min.Index {
-			min = &snapshot
+			min = snapshot
 		}
 	}
 	return min
@@ -382,34 +407,134 @@ func IsGenerationName(s string) bool {
 	return true
 }
 
-// FormatIndex formats an index as an 8-character hex value.
+// GenerationsPath returns the path to a generation root directory.
-func FormatIndex(index int) string {
+func GenerationsPath(root string) string {
-	return fmt.Sprintf("%08x", index)
+	return path.Join(root, "generations")
 }
 
-// ParseIndex parses a hex-formatted index into an integer.
+// GenerationPath returns the path to a generation's root directory.
-func ParseIndex(s string) (int, error) {
+func GenerationPath(root, generation string) (string, error) {
-	v, err := strconv.ParseUint(s, 16, 32)
+	dir := GenerationsPath(root)
-	if err != nil {
+	if generation == "" {
-		return -1, fmt.Errorf("cannot parse index: %q", s)
+		return "", fmt.Errorf("generation required")
 	}
-	return int(v), nil
+	return path.Join(dir, generation), nil
 }
 
-// FormatOffset formats an offset as an 8-character hex value.
+// SnapshotsPath returns the path to a generation's snapshot directory.
-func FormatOffset(offset int64) string {
+func SnapshotsPath(root, generation string) (string, error) {
-	return fmt.Sprintf("%08x", offset)
+	dir, err := GenerationPath(root, generation)
-}
-
-// ParseOffset parses a hex-formatted offset into an integer.
-func ParseOffset(s string) (int64, error) {
-	v, err := strconv.ParseInt(s, 16, 32)
 	if err != nil {
-		return -1, fmt.Errorf("cannot parse index: %q", s)
+		return "", err
 	}
-	return v, nil
+	return path.Join(dir, "snapshots"), nil
 }
 
+// SnapshotPath returns the path to an uncompressed snapshot file.
+func SnapshotPath(root, generation string, index int) (string, error) {
+	dir, err := SnapshotsPath(root, generation)
+	if err != nil {
+		return "", err
+	}
+	return path.Join(dir, FormatSnapshotPath(index)), nil
+}
+
+// WALPath returns the path to a generation's WAL directory
+func WALPath(root, generation string) (string, error) {
+	dir, err := GenerationPath(root, generation)
+	if err != nil {
+		return "", err
+	}
+	return path.Join(dir, "wal"), nil
+}
+
+// WALSegmentPath returns the path to a WAL segment file.
+func WALSegmentPath(root, generation string, index int, offset int64) (string, error) {
+	dir, err := WALPath(root, generation)
+	if err != nil {
+		return "", err
+	}
+	return path.Join(dir, FormatWALSegmentPath(index, offset)), nil
+}
+
+// IsSnapshotPath returns true if s is a path to a snapshot file.
+func IsSnapshotPath(s string) bool {
+	return snapshotPathRegex.MatchString(s)
+}
+
+// ParseSnapshotPath returns the index for the snapshot.
+// Returns an error if the path is not a valid snapshot path.
+func ParseSnapshotPath(s string) (index int, err error) {
+	s = filepath.Base(s)
+
+	a := snapshotPathRegex.FindStringSubmatch(s)
+	if a == nil {
+		return 0, fmt.Errorf("invalid snapshot path: %s", s)
+	}
+
+	i64, _ := strconv.ParseUint(a[1], 16, 64)
+	return int(i64), nil
+}
+
+// FormatSnapshotPath formats a snapshot filename with a given index.
+func FormatSnapshotPath(index int) string {
+	assert(index >= 0, "snapshot index must be non-negative")
+	return fmt.Sprintf("%08x%s", index, SnapshotExt)
+}
+
+var snapshotPathRegex = regexp.MustCompile(`^([0-9a-f]{8})\.snapshot\.lz4$`)
+
+// IsWALPath returns true if s is a path to a WAL file.
+func IsWALPath(s string) bool {
+	return walPathRegex.MatchString(s)
+}
+
+// ParseWALPath returns the index for the WAL file.
+// Returns an error if the path is not a valid WAL path.
+func ParseWALPath(s string) (index int, err error) {
+	s = filepath.Base(s)
+
+	a := walPathRegex.FindStringSubmatch(s)
+	if a == nil {
+		return 0, fmt.Errorf("invalid wal path: %s", s)
+	}
+
+	i64, _ := strconv.ParseUint(a[1], 16, 64)
+	return int(i64), nil
+}
+
+// FormatWALPath formats a WAL filename with a given index.
+func FormatWALPath(index int) string {
+	assert(index >= 0, "wal index must be non-negative")
+	return fmt.Sprintf("%08x%s", index, WALExt)
+}
+
+var walPathRegex = regexp.MustCompile(`^([0-9a-f]{8})\.wal$`)
+
+// ParseWALSegmentPath returns the index & offset for the WAL segment file.
+// Returns an error if the path is not a valid wal segment path.
+func ParseWALSegmentPath(s string) (index int, offset int64, err error) {
+	s = filepath.Base(s)
+
+	a := walSegmentPathRegex.FindStringSubmatch(s)
+	if a == nil {
+		return 0, 0, fmt.Errorf("invalid wal segment path: %s", s)
+	}
+
+	i64, _ := strconv.ParseUint(a[1], 16, 64)
+	off64, _ := strconv.ParseUint(a[2], 16, 64)
+	return int(i64), int64(off64), nil
+}
+
+// FormatWALSegmentPath formats a WAL segment filename with a given index & offset.
+func FormatWALSegmentPath(index int, offset int64) string {
+	assert(index >= 0, "wal index must be non-negative")
+	assert(offset >= 0, "wal offset must be non-negative")
+	return fmt.Sprintf("%08x_%08x%s", index, offset, WALSegmentExt)
+}
+
+var walSegmentPathRegex = regexp.MustCompile(`^([0-9a-f]{8})(?:_([0-9a-f]{8}))\.wal\.lz4$`)
+
 // isHexChar returns true if ch is a lowercase hex character.
 func isHexChar(ch rune) bool {
 	return (ch >= '0' && ch <= '9') || (ch >= 'a' && ch <= 'f')

litestream_test.go

@@ -40,6 +40,104 @@ func TestChecksum(t *testing.T) {
 	})
 }
 
+func TestGenerationsPath(t *testing.T) {
+	t.Run("OK", func(t *testing.T) {
+		if got, want := litestream.GenerationsPath("foo"), "foo/generations"; got != want {
+			t.Fatalf("GenerationsPath()=%v, want %v", got, want)
+		}
+	})
+	t.Run("NoPath", func(t *testing.T) {
+		if got, want := litestream.GenerationsPath(""), "generations"; got != want {
+			t.Fatalf("GenerationsPath()=%v, want %v", got, want)
+		}
+	})
+}
+
+func TestGenerationPath(t *testing.T) {
+	t.Run("OK", func(t *testing.T) {
+		if got, err := litestream.GenerationPath("foo", "0123456701234567"); err != nil {
+			t.Fatal(err)
+		} else if want := "foo/generations/0123456701234567"; got != want {
+			t.Fatalf("GenerationPath()=%v, want %v", got, want)
+		}
+	})
+	t.Run("ErrNoGeneration", func(t *testing.T) {
+		if _, err := litestream.GenerationPath("foo", ""); err == nil || err.Error() != `generation required` {
+			t.Fatalf("expected error: %v", err)
+		}
+	})
+}
+
+func TestSnapshotsPath(t *testing.T) {
+	t.Run("OK", func(t *testing.T) {
+		if got, err := litestream.SnapshotsPath("foo", "0123456701234567"); err != nil {
+			t.Fatal(err)
+		} else if want := "foo/generations/0123456701234567/snapshots"; got != want {
+			t.Fatalf("SnapshotsPath()=%v, want %v", got, want)
+		}
+	})
+	t.Run("ErrNoGeneration", func(t *testing.T) {
+		if _, err := litestream.SnapshotsPath("foo", ""); err == nil || err.Error() != `generation required` {
+			t.Fatalf("unexpected error: %v", err)
+		}
+	})
+}
+
+func TestSnapshotPath(t *testing.T) {
+	t.Run("OK", func(t *testing.T) {
+		if got, err := litestream.SnapshotPath("foo", "0123456701234567", 1000); err != nil {
+			t.Fatal(err)
+		} else if want := "foo/generations/0123456701234567/snapshots/000003e8.snapshot.lz4"; got != want {
+			t.Fatalf("SnapshotPath()=%v, want %v", got, want)
+		}
+	})
+	t.Run("ErrNoGeneration", func(t *testing.T) {
+		if _, err := litestream.SnapshotPath("foo", "", 1000); err == nil || err.Error() != `generation required` {
+			t.Fatalf("unexpected error: %v", err)
+		}
+	})
+}
+
+func TestWALPath(t *testing.T) {
+	t.Run("OK", func(t *testing.T) {
+		if got, err := litestream.WALPath("foo", "0123456701234567"); err != nil {
+			t.Fatal(err)
+		} else if want := "foo/generations/0123456701234567/wal"; got != want {
+			t.Fatalf("WALPath()=%v, want %v", got, want)
+		}
+	})
+	t.Run("ErrNoGeneration", func(t *testing.T) {
+		if _, err := litestream.WALPath("foo", ""); err == nil || err.Error() != `generation required` {
+			t.Fatalf("unexpected error: %v", err)
+		}
+	})
+}
+
+func TestWALSegmentPath(t *testing.T) {
+	t.Run("OK", func(t *testing.T) {
+		if got, err := litestream.WALSegmentPath("foo", "0123456701234567", 1000, 1001); err != nil {
+			t.Fatal(err)
+		} else if want := "foo/generations/0123456701234567/wal/000003e8_000003e9.wal.lz4"; got != want {
+			t.Fatalf("WALPath()=%v, want %v", got, want)
+		}
+	})
+	t.Run("ErrNoGeneration", func(t *testing.T) {
+		if _, err := litestream.WALSegmentPath("foo", "", 1000, 0); err == nil || err.Error() != `generation required` {
+			t.Fatalf("unexpected error: %v", err)
+		}
+	})
+}
+
+func TestFindMinSnapshotByGeneration(t *testing.T) {
+	infos := []litestream.SnapshotInfo{
+		{Generation: "29cf4bced74e92ab", Index: 0},
+		{Generation: "5dfeb4aa03232553", Index: 24},
+	}
+	if got, want := litestream.FindMinSnapshotByGeneration(infos, "29cf4bced74e92ab"), &infos[0]; got != want {
+		t.Fatalf("info=%#v, want %#v", got, want)
+	}
+}
+
 func MustDecodeHexString(s string) []byte {
 	b, err := hex.DecodeString(s)
 	if err != nil {

replica.go

@@ -15,6 +15,7 @@ import (
 	"sync"
 	"time"
 
+	"filippo.io/age"
 	"github.com/benbjohnson/litestream/internal"
 	"github.com/pierrec/lz4/v4"
 	"github.com/prometheus/client_golang/prometheus"
@@ -67,6 +68,13 @@ type Replica struct {
 	// If true, replica monitors database for changes automatically.
 	// Set to false if replica is being used synchronously (such as in tests).
 	MonitorEnabled bool
+
+	// Encryption identities and recipients
+	AgeIdentities []age.Identity
+	AgeRecipients []age.Recipient
+
+	// The logger to send logging messages to. Defaults to log.Default()
+	Logger *log.Logger
 }
 
 func NewReplica(db *DB, name string) *Replica {
@@ -79,6 +87,7 @@ func NewReplica(db *DB, name string) *Replica {
 		Retention:              DefaultRetention,
 		RetentionCheckInterval: DefaultRetentionCheckInterval,
 		MonitorEnabled:         true,
+		Logger:                 log.Default(),
 	}
 
 	return r
@@ -159,6 +168,9 @@ func (r *Replica) Sync(ctx context.Context) (err error) {
 
 	Tracef("%s(%s): replica sync: db.pos=%s", r.db.Path(), r.Name(), dpos)
 
+	// Create a new snapshot and update the current replica position if
+	// the generation on the database has changed.
+	if r.Pos().Generation != generation {
 		// Create snapshot if no snapshots exist for generation.
 		snapshotN, err := r.snapshotN(generation)
 		if err != nil {
@@ -169,12 +181,8 @@ func (r *Replica) Sync(ctx context.Context) (err error) {
 			} else if info.Generation != generation {
 				return fmt.Errorf("generation changed during snapshot, exiting sync")
 			}
-		snapshotN = 1
 		}
-	replicaSnapshotTotalGaugeVec.WithLabelValues(r.db.Path(), r.Name()).Set(float64(snapshotN))
 
-	// Determine position, if necessary.
-	if r.Pos().Generation != generation {
 		pos, err := r.calcPos(ctx, generation)
 		if err != nil {
 			return fmt.Errorf("cannot determine replica position: %s", err)
@@ -222,8 +230,20 @@ func (r *Replica) syncWAL(ctx context.Context) (err error) {
 		return err
 	})
 
+	var ew io.WriteCloser = pw
+
+	// Add encryption if we have recipients.
+	if len(r.AgeRecipients) > 0 {
+		var err error
+		ew, err = age.Encrypt(pw, r.AgeRecipients...)
+		if err != nil {
+			return err
+		}
+		defer ew.Close()
+	}
+
 	// Wrap writer to LZ4 compress.
-	zw := lz4.NewWriter(pw)
+	zw := lz4.NewWriter(ew)
 
 	// Track total WAL bytes written to replica client.
 	walBytesCounter := replicaWALBytesCounterVec.WithLabelValues(r.db.Path(), r.Name())
@@ -271,9 +291,11 @@ func (r *Replica) syncWAL(ctx context.Context) (err error) {
 		walBytesCounter.Add(float64(n))
 	}
 
-	// Flush LZ4 writer and close pipe.
+	// Flush LZ4 writer, encryption writer and close pipe.
 	if err := zw.Close(); err != nil {
 		return err
+	} else if err := ew.Close(); err != nil {
+		return err
 	} else if err := pw.Close(); err != nil {
 		return err
 	}
@@ -335,6 +357,15 @@ func (r *Replica) calcPos(ctx context.Context, generation string) (pos Pos, err
 	}
 	defer rd.Close()
 
+	if len(r.AgeIdentities) > 0 {
+		drd, err := age.Decrypt(rd, r.AgeIdentities...)
+		if err != nil {
+			return pos, err
+		}
+
+		rd = io.NopCloser(drd)
+	}
+
 	n, err := io.Copy(ioutil.Discard, lz4.NewReader(rd))
 	if err != nil {
 		return pos, err
@@ -471,7 +502,23 @@ func (r *Replica) Snapshot(ctx context.Context) (info SnapshotInfo, err error) {
 	// Copy the database file to the LZ4 writer in a separate goroutine.
 	var g errgroup.Group
 	g.Go(func() error {
-		zr := lz4.NewWriter(pw)
+		// We need to ensure the pipe is closed.
+		defer pw.Close()
+
+		var wc io.WriteCloser = pw
+
+		// Add encryption if we have recipients.
+		if len(r.AgeRecipients) > 0 {
+			var err error
+			wc, err = age.Encrypt(pw, r.AgeRecipients...)
+			if err != nil {
+				pw.CloseWithError(err)
+				return err
+			}
+			defer wc.Close()
+		}
+
+		zr := lz4.NewWriter(wc)
 		defer zr.Close()
 
 		if _, err := io.Copy(zr, r.f); err != nil {
@@ -481,7 +528,7 @@ func (r *Replica) Snapshot(ctx context.Context) (info SnapshotInfo, err error) {
 			pw.CloseWithError(err)
 			return err
 		}
-		return pw.Close()
+		return wc.Close()
 	})
 
 	// Delegate write to client & wait for writer goroutine to finish.
@@ -491,7 +538,7 @@ func (r *Replica) Snapshot(ctx context.Context) (info SnapshotInfo, err error) {
 		return info, err
 	}
 
-	log.Printf("%s(%s): snapshot written %s/%08x", r.db.Path(), r.Name(), pos.Generation, pos.Index)
+	r.Logger.Printf("%s(%s): snapshot written %s/%08x", r.db.Path(), r.Name(), pos.Generation, pos.Index)
 
 	return info, nil
 }
@@ -559,7 +606,7 @@ func (r *Replica) deleteSnapshotsBeforeIndex(ctx context.Context, generation str
 		if err := r.Client.DeleteSnapshot(ctx, info.Generation, info.Index); err != nil {
 			return fmt.Errorf("delete snapshot %s/%08x: %w", info.Generation, info.Index, err)
 		}
-		log.Printf("%s(%s): snapshot deleted %s/%08x", r.db.Path(), r.Name(), generation, index)
+		r.Logger.Printf("%s(%s): snapshot deleted %s/%08x", r.db.Path(), r.Name(), generation, index)
 	}
 
 	return itr.Close()
@@ -591,7 +638,7 @@ func (r *Replica) deleteWALSegmentsBeforeIndex(ctx context.Context, generation s
 	if err := r.Client.DeleteWALSegments(ctx, a); err != nil {
 		return fmt.Errorf("delete wal segments: %w", err)
 	}
-	log.Printf("%s(%s): wal segmented deleted before %s/%08x: n=%d", r.db.Path(), r.Name(), generation, index, len(a))
+	r.Logger.Printf("%s(%s): wal segmented deleted before %s/%08x: n=%d", r.db.Path(), r.Name(), generation, index, len(a))
 
 	return nil
 }
@@ -628,7 +675,7 @@ func (r *Replica) monitor(ctx context.Context) {
 
 		// Synchronize the shadow wal into the replication directory.
 		if err := r.Sync(ctx); err != nil {
-			log.Printf("%s(%s): monitor error: %s", r.db.Path(), r.Name(), err)
+			r.Logger.Printf("%s(%s): monitor error: %s", r.db.Path(), r.Name(), err)
 			continue
 		}
 	}
@@ -656,7 +703,7 @@ func (r *Replica) retainer(ctx context.Context) {
 			return
 		case <-ticker.C:
 			if err := r.EnforceRetention(ctx); err != nil {
-				log.Printf("%s(%s): retainer error: %s", r.db.Path(), r.Name(), err)
+				r.Logger.Printf("%s(%s): retainer error: %s", r.db.Path(), r.Name(), err)
 				continue
 			}
 		}
@@ -678,7 +725,7 @@ func (r *Replica) snapshotter(ctx context.Context) {
 			return
 		case <-ticker.C:
 			if _, err := r.Snapshot(ctx); err != nil && err != ErrNoGeneration {
-				log.Printf("%s(%s): snapshotter error: %s", r.db.Path(), r.Name(), err)
+				r.Logger.Printf("%s(%s): snapshotter error: %s", r.db.Path(), r.Name(), err)
 				continue
 			}
 		}
@@ -706,7 +753,7 @@ func (r *Replica) validator(ctx context.Context) {
 			return
 		case <-ticker.C:
 			if err := r.Validate(ctx); err != nil {
-				log.Printf("%s(%s): validation error: %s", r.db.Path(), r.Name(), err)
+				r.Logger.Printf("%s(%s): validation error: %s", r.db.Path(), r.Name(), err)
 				continue
 			}
 		}
@@ -743,7 +790,7 @@ func (r *Replica) Validate(ctx context.Context) error {
 		ReplicaName: r.Name(),
 		Generation:  pos.Generation,
 		Index:       pos.Index - 1,
-		Logger:      log.New(os.Stderr, "", 0),
+		Logger:      r.Logger,
 	}); err != nil {
 		return fmt.Errorf("cannot restore: %w", err)
 	}
@@ -768,7 +815,7 @@ func (r *Replica) Validate(ctx context.Context) error {
 	if mismatch {
 		status = "mismatch"
 	}
-	log.Printf("%s(%s): validator: status=%s db=%016x replica=%016x pos=%s", db.Path(), r.Name(), status, chksum0, chksum1, pos)
+	r.Logger.Printf("%s(%s): validator: status=%s db=%016x replica=%016x pos=%s", db.Path(), r.Name(), status, chksum0, chksum1, pos)
 
 	// Validate checksums match.
 	if mismatch {
@@ -810,7 +857,7 @@ func (r *Replica) waitForReplica(ctx context.Context, pos Pos) error {
 		// Obtain current position of replica, check if past target position.
 		curr := r.Pos()
 		if curr.IsZero() {
-			log.Printf("%s(%s): validator: no replica position available", db.Path(), r.Name())
+			r.Logger.Printf("%s(%s): validator: no replica position available", db.Path(), r.Name())
 			continue
 		}
 
@@ -965,7 +1012,7 @@ func (r *Replica) Restore(ctx context.Context, opt RestoreOptions) (err error) {
 	// Ensure logger exists.
 	logger := opt.Logger
 	if logger == nil {
-		logger = log.New(ioutil.Discard, "", 0)
+		logger = r.Logger
 	}
 
 	logPrefix := r.Name()
@@ -1260,6 +1307,15 @@ func (r *Replica) restoreSnapshot(ctx context.Context, generation string, index
 	}
 	defer rd.Close()
 
+	if len(r.AgeIdentities) > 0 {
+		drd, err := age.Decrypt(rd, r.AgeIdentities...)
+		if err != nil {
+			return err
+		}
+
+		rd = io.NopCloser(drd)
+	}
+
 	if _, err := io.Copy(f, lz4.NewReader(rd)); err != nil {
 		return err
 	} else if err := f.Sync(); err != nil {
@@ -1286,6 +1342,16 @@ func (r *Replica) downloadWAL(ctx context.Context, generation string, index int,
 			return err
 		}
 		defer rd.Close()
+
+		if len(r.AgeIdentities) > 0 {
+			drd, err := age.Decrypt(rd, r.AgeIdentities...)
+			if err != nil {
+				return err
+			}
+
+			rd = io.NopCloser(drd)
+		}
+
 		readers = append(readers, lz4.NewReader(rd))
 	}
 
@@ -1307,13 +1373,6 @@ func (r *Replica) downloadWAL(ctx context.Context, generation string, index int,
 
 // Replica metrics.
 var (
-	replicaSnapshotTotalGaugeVec = promauto.NewGaugeVec(prometheus.GaugeOpts{
-		Namespace: "litestream",
-		Subsystem: "replica",
-		Name:      "snapshot_total",
-		Help:      "The current number of snapshots",
-	}, []string{"db", "name"})
-
 	replicaWALBytesCounterVec = promauto.NewCounterVec(prometheus.CounterOpts{
 		Namespace: "litestream",
 		Subsystem: "replica",

replica_client_test.go

@@ -177,7 +177,7 @@ func TestReplicaClient_Snapshots(t *testing.T) {
 		if err == nil {
 			err = itr.Close()
 		}
-		if err == nil || err.Error() != `generation required` {
+		if err == nil || err.Error() != `cannot determine snapshots path: generation required` {
 			t.Fatalf("unexpected error: %v", err)
 		}
 	})
@@ -204,7 +204,7 @@ func TestReplicaClient_WriteSnapshot(t *testing.T) {
 
 	RunWithReplicaClient(t, "ErrNoGeneration", func(t *testing.T, c litestream.ReplicaClient) {
 		t.Parallel()
-		if _, err := c.WriteSnapshot(context.Background(), "", 0, nil); err == nil || err.Error() != `generation required` {
+		if _, err := c.WriteSnapshot(context.Background(), "", 0, nil); err == nil || err.Error() != `cannot determine snapshot path: generation required` {
 			t.Fatalf("unexpected error: %v", err)
 		}
 	})
@@ -242,13 +242,13 @@ func TestReplicaClient_SnapshotReader(t *testing.T) {
 	RunWithReplicaClient(t, "ErrNoGeneration", func(t *testing.T, c litestream.ReplicaClient) {
 		t.Parallel()
 
-		if _, err := c.SnapshotReader(context.Background(), "", 1); err == nil || err.Error() != `generation required` {
+		if _, err := c.SnapshotReader(context.Background(), "", 1); err == nil || err.Error() != `cannot determine snapshot path: generation required` {
 			t.Fatalf("unexpected error: %v", err)
 		}
 	})
 }
 
-func TestReplicaClient_WALSegments(t *testing.T) {
+func TestReplicaClient_WALs(t *testing.T) {
 	RunWithReplicaClient(t, "OK", func(t *testing.T, c litestream.ReplicaClient) {
 		t.Parallel()
 
@@ -362,7 +362,7 @@ func TestReplicaClient_WALSegments(t *testing.T) {
 		if err == nil {
 			err = itr.Close()
 		}
-		if err == nil || err.Error() != `generation required` {
+		if err == nil || err.Error() != `cannot determine wal path: generation required` {
 			t.Fatalf("unexpected error: %v", err)
 		}
 	})
@@ -389,13 +389,13 @@ func TestReplicaClient_WriteWALSegment(t *testing.T) {
 
 	RunWithReplicaClient(t, "ErrNoGeneration", func(t *testing.T, c litestream.ReplicaClient) {
 		t.Parallel()
-		if _, err := c.WriteWALSegment(context.Background(), litestream.Pos{Generation: "", Index: 0, Offset: 0}, nil); err == nil || err.Error() != `generation required` {
+		if _, err := c.WriteWALSegment(context.Background(), litestream.Pos{Generation: "", Index: 0, Offset: 0}, nil); err == nil || err.Error() != `cannot determine wal segment path: generation required` {
 			t.Fatalf("unexpected error: %v", err)
 		}
 	})
 }
 
-func TestReplicaClient_WALSegmentReader(t *testing.T) {
+func TestReplicaClient_WALReader(t *testing.T) {
 
 	RunWithReplicaClient(t, "OK", func(t *testing.T, c litestream.ReplicaClient) {
 		t.Parallel()
@@ -451,7 +451,7 @@ func TestReplicaClient_DeleteWALSegments(t *testing.T) {
 
 	RunWithReplicaClient(t, "ErrNoGeneration", func(t *testing.T, c litestream.ReplicaClient) {
 		t.Parallel()
-		if err := c.DeleteWALSegments(context.Background(), []litestream.Pos{{}}); err == nil || err.Error() != `generation required` {
+		if err := c.DeleteWALSegments(context.Background(), []litestream.Pos{{}}); err == nil || err.Error() != `cannot determine wal segment path: generation required` {
 			t.Fatalf("unexpected error: %v", err)
 		}
 	})

s3/replica_client.go

@@ -10,14 +10,12 @@ import (
 	"os"
 	"path"
 	"regexp"
-	"strings"
 	"sync"
 	"time"
 
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/aws/awserr"
 	"github.com/aws/aws-sdk-go/aws/credentials"
-	"github.com/aws/aws-sdk-go/aws/defaults"
 	"github.com/aws/aws-sdk-go/aws/session"
 	"github.com/aws/aws-sdk-go/service/s3"
 	"github.com/aws/aws-sdk-go/service/s3/s3manager"
@@ -94,6 +92,7 @@ func (c *ReplicaClient) Init(ctx context.Context) (err error) {
 	if region != "" {
 		config.Region = aws.String(region)
 	}
+
 	sess, err := session.NewSession(config)
 	if err != nil {
 		return fmt.Errorf("cannot create aws session: %w", err)
@@ -106,7 +105,8 @@ func (c *ReplicaClient) Init(ctx context.Context) (err error) {
 // config returns the AWS configuration. Uses the default credential chain
 // unless a key/secret are explicitly set.
 func (c *ReplicaClient) config() *aws.Config {
-	config := defaults.Get().Config
+	config := &aws.Config{}
+
 	if c.AccessKeyID != "" || c.SecretAccessKey != "" {
 		config.Credentials = credentials.NewStaticCredentials(c.AccessKeyID, c.SecretAccessKey, "")
 	}
@@ -155,7 +155,7 @@ func (c *ReplicaClient) Generations(ctx context.Context) ([]string, error) {
 	var generations []string
 	if err := c.s3.ListObjectsPagesWithContext(ctx, &s3.ListObjectsInput{
 		Bucket:    aws.String(c.Bucket),
-		Prefix:    aws.String(path.Join(c.Path, "generations") + "/"),
+		Prefix:    aws.String(litestream.GenerationsPath(c.Path) + "/"),
 		Delimiter: aws.String("/"),
 	}, func(page *s3.ListObjectsOutput, lastPage bool) bool {
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()
@@ -179,15 +179,18 @@ func (c *ReplicaClient) Generations(ctx context.Context) ([]string, error) {
 func (c *ReplicaClient) DeleteGeneration(ctx context.Context, generation string) error {
 	if err := c.Init(ctx); err != nil {
 		return err
-	} else if generation == "" {
+	}
-		return fmt.Errorf("generation required")
+
+	dir, err := litestream.GenerationPath(c.Path, generation)
+	if err != nil {
+		return fmt.Errorf("cannot determine generation path: %w", err)
 	}
 
 	// Collect all files for the generation.
 	var objIDs []*s3.ObjectIdentifier
 	if err := c.s3.ListObjectsPagesWithContext(ctx, &s3.ListObjectsInput{
 		Bucket: aws.String(c.Bucket),
-		Prefix: aws.String(path.Join(c.Path, "generations", generation)),
+		Prefix: aws.String(dir),
 	}, func(page *s3.ListObjectsOutput, lastPage bool) bool {
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()
 
@@ -206,10 +209,14 @@ func (c *ReplicaClient) DeleteGeneration(ctx context.Context, generation string)
 			n = len(objIDs)
 		}
 
-		if _, err := c.s3.DeleteObjectsWithContext(ctx, &s3.DeleteObjectsInput{
+		out, err := c.s3.DeleteObjectsWithContext(ctx, &s3.DeleteObjectsInput{
 			Bucket: aws.String(c.Bucket),
 			Delete: &s3.Delete{Objects: objIDs[:n], Quiet: aws.Bool(true)},
-		}); err != nil {
+		})
+		if err != nil {
+			return err
+		}
+		if err := deleteOutputError(out); err != nil {
 			return err
 		}
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "DELETE").Inc()
@@ -234,11 +241,12 @@ func (c *ReplicaClient) Snapshots(ctx context.Context, generation string) (lites
 func (c *ReplicaClient) WriteSnapshot(ctx context.Context, generation string, index int, rd io.Reader) (info litestream.SnapshotInfo, err error) {
 	if err := c.Init(ctx); err != nil {
 		return info, err
-	} else if generation == "" {
-		return info, fmt.Errorf("generation required")
 	}
 
-	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")
+	key, err := litestream.SnapshotPath(c.Path, generation, index)
+	if err != nil {
+		return info, fmt.Errorf("cannot determine snapshot path: %w", err)
+	}
 	startTime := time.Now()
 
 	rc := internal.NewReadCounter(rd)
@@ -267,11 +275,12 @@ func (c *ReplicaClient) WriteSnapshot(ctx context.Context, generation string, in
 func (c *ReplicaClient) SnapshotReader(ctx context.Context, generation string, index int) (io.ReadCloser, error) {
 	if err := c.Init(ctx); err != nil {
 		return nil, err
-	} else if generation == "" {
-		return nil, fmt.Errorf("generation required")
 	}
 
-	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")
+	key, err := litestream.SnapshotPath(c.Path, generation, index)
+	if err != nil {
+		return nil, fmt.Errorf("cannot determine snapshot path: %w", err)
+	}
 
 	out, err := c.s3.GetObjectWithContext(ctx, &s3.GetObjectInput{
 		Bucket: aws.String(c.Bucket),
@@ -292,16 +301,21 @@ func (c *ReplicaClient) SnapshotReader(ctx context.Context, generation string, i
 func (c *ReplicaClient) DeleteSnapshot(ctx context.Context, generation string, index int) error {
 	if err := c.Init(ctx); err != nil {
 		return err
-	} else if generation == "" {
-		return fmt.Errorf("generation required")
 	}
 
-	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")
+	key, err := litestream.SnapshotPath(c.Path, generation, index)
+	if err != nil {
+		return fmt.Errorf("cannot determine snapshot path: %w", err)
+	}
 
-	if _, err := c.s3.DeleteObjectsWithContext(ctx, &s3.DeleteObjectsInput{
+	out, err := c.s3.DeleteObjectsWithContext(ctx, &s3.DeleteObjectsInput{
 		Bucket: aws.String(c.Bucket),
 		Delete: &s3.Delete{Objects: []*s3.ObjectIdentifier{{Key: &key}}, Quiet: aws.Bool(true)},
-	}); err != nil {
+	})
+	if err != nil {
+		return err
+	}
+	if err := deleteOutputError(out); err != nil {
 		return err
 	}
 
@@ -321,11 +335,12 @@ func (c *ReplicaClient) WALSegments(ctx context.Context, generation string) (lit
 func (c *ReplicaClient) WriteWALSegment(ctx context.Context, pos litestream.Pos, rd io.Reader) (info litestream.WALSegmentInfo, err error) {
 	if err := c.Init(ctx); err != nil {
 		return info, err
-	} else if pos.Generation == "" {
-		return info, fmt.Errorf("generation required")
 	}
 
-	key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
+	key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
+	if err != nil {
+		return info, fmt.Errorf("cannot determine wal segment path: %w", err)
+	}
 	startTime := time.Now()
 
 	rc := internal.NewReadCounter(rd)
@@ -354,11 +369,12 @@ func (c *ReplicaClient) WriteWALSegment(ctx context.Context, pos litestream.Pos,
 func (c *ReplicaClient) WALSegmentReader(ctx context.Context, pos litestream.Pos) (io.ReadCloser, error) {
 	if err := c.Init(ctx); err != nil {
 		return nil, err
-	} else if pos.Generation == "" {
-		return nil, fmt.Errorf("generation required")
 	}
 
-	key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
+	key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
+	if err != nil {
+		return nil, fmt.Errorf("cannot determine wal segment path: %w", err)
+	}
 
 	out, err := c.s3.GetObjectWithContext(ctx, &s3.GetObjectInput{
 		Bucket: aws.String(c.Bucket),
@@ -390,21 +406,24 @@ func (c *ReplicaClient) DeleteWALSegments(ctx context.Context, a []litestream.Po
 
 		// Generate a batch of object IDs for deleting the WAL segments.
 		for i, pos := range a[:n] {
-			if pos.Generation == "" {
+			key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
-				return fmt.Errorf("generation required")
+			if err != nil {
+				return fmt.Errorf("cannot determine wal segment path: %w", err)
 			}
-			key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
 			objIDs[i] = &s3.ObjectIdentifier{Key: &key}
 		}
 
 		// Delete S3 objects in bulk.
-		if _, err := c.s3.DeleteObjectsWithContext(ctx, &s3.DeleteObjectsInput{
+		out, err := c.s3.DeleteObjectsWithContext(ctx, &s3.DeleteObjectsInput{
 			Bucket: aws.String(c.Bucket),
 			Delete: &s3.Delete{Objects: objIDs[:n], Quiet: aws.Bool(true)},
-		}); err != nil {
+		})
+		if err != nil {
+			return err
+		}
+		if err := deleteOutputError(out); err != nil {
 			return err
 		}
-
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "DELETE").Inc()
 
 		a = a[n:]
@@ -447,10 +466,14 @@ func (c *ReplicaClient) DeleteAll(ctx context.Context) error {
 			n = len(objIDs)
 		}
 
-		if _, err := c.s3.DeleteObjectsWithContext(ctx, &s3.DeleteObjectsInput{
+		out, err := c.s3.DeleteObjectsWithContext(ctx, &s3.DeleteObjectsInput{
 			Bucket: aws.String(c.Bucket),
 			Delete: &s3.Delete{Objects: objIDs[:n], Quiet: aws.Bool(true)},
-		}); err != nil {
+		})
+		if err != nil {
+			return err
+		}
+		if err := deleteOutputError(out); err != nil {
 			return err
 		}
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "DELETE").Inc()
@@ -491,12 +514,11 @@ func newSnapshotIterator(ctx context.Context, client *ReplicaClient, generation
 func (itr *snapshotIterator) fetch() error {
 	defer close(itr.ch)
 
-	if itr.generation == "" {
+	dir, err := litestream.SnapshotsPath(itr.client.Path, itr.generation)
-		return fmt.Errorf("generation required")
+	if err != nil {
+		return fmt.Errorf("cannot determine snapshots path: %w", err)
 	}
 
-	dir := path.Join(itr.client.Path, "generations", itr.generation, "snapshots")
-
 	return itr.client.s3.ListObjectsPagesWithContext(itr.ctx, &s3.ListObjectsInput{
 		Bucket:    aws.String(itr.client.Bucket),
 		Prefix:    aws.String(dir + "/"),
@@ -505,7 +527,8 @@ func (itr *snapshotIterator) fetch() error {
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()
 
 		for _, obj := range page.Contents {
-			index, err := internal.ParseSnapshotPath(path.Base(*obj.Key))
+			key := path.Base(*obj.Key)
+			index, err := litestream.ParseSnapshotPath(key)
 			if err != nil {
 				continue
 			}
@@ -594,20 +617,21 @@ func newWALSegmentIterator(ctx context.Context, client *ReplicaClient, generatio
 func (itr *walSegmentIterator) fetch() error {
 	defer close(itr.ch)
 
-	if itr.generation == "" {
+	dir, err := litestream.WALPath(itr.client.Path, itr.generation)
-		return fmt.Errorf("generation required")
+	if err != nil {
+		return fmt.Errorf("cannot determine wal path: %w", err)
 	}
 
-	prefix := path.Join(itr.client.Path, "generations", itr.generation, "wal") + "/"
-
 	return itr.client.s3.ListObjectsPagesWithContext(itr.ctx, &s3.ListObjectsInput{
 		Bucket:    aws.String(itr.client.Bucket),
-		Prefix: aws.String(prefix),
+		Prefix:    aws.String(dir + "/"),
+		Delimiter: aws.String("/"),
 	}, func(page *s3.ListObjectsOutput, lastPage bool) bool {
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()
 
 		for _, obj := range page.Contents {
-			index, offset, err := internal.ParseWALSegmentPath(strings.TrimPrefix(*obj.Key, prefix))
+			key := path.Base(*obj.Key)
+			index, offset, err := litestream.ParseWALSegmentPath(key)
 			if err != nil {
 				continue
 			}
@@ -729,3 +753,15 @@ func isNotExists(err error) bool {
 		return false
 	}
 }
+
+func deleteOutputError(out *s3.DeleteObjectsOutput) error {
+	switch len(out.Errors) {
+	case 0:
+		return nil
+	case 1:
+		return fmt.Errorf("deleting object %s: %s - %s", *out.Errors[0].Key, *out.Errors[0].Code, *out.Errors[0].Message)
+	default:
+		return fmt.Errorf("%d errors occured deleting objects, %s: %s - (%s (and %d others)",
+			len(out.Errors), *out.Errors[0].Key, *out.Errors[0].Code, *out.Errors[0].Message, len(out.Errors)-1)
+	}
+}

sftp/replica_client.go

@@ -9,7 +9,6 @@ import (
 	"os"
 	"path"
 	"sort"
-	"strings"
 	"sync"
 	"time"
 
@@ -122,7 +121,7 @@ func (c *ReplicaClient) Generations(ctx context.Context) (_ []string, err error)
 		return nil, err
 	}
 
-	fis, err := sftpClient.ReadDir(path.Join(c.Path, "generations"))
+	fis, err := sftpClient.ReadDir(litestream.GenerationsPath(c.Path))
 	if os.IsNotExist(err) {
 		return nil, nil
 	} else if err != nil {
@@ -154,11 +153,12 @@ func (c *ReplicaClient) DeleteGeneration(ctx context.Context, generation string)
 	sftpClient, err := c.Init(ctx)
 	if err != nil {
 		return err
-	} else if generation == "" {
-		return fmt.Errorf("generation required")
 	}
 
-	dir := path.Join(c.Path, "generations", generation)
+	dir, err := litestream.GenerationPath(c.Path, generation)
+	if err != nil {
+		return fmt.Errorf("cannot determine generation path: %w", err)
+	}
 
 	var dirs []string
 	walker := sftpClient.Walk(dir)
@@ -198,11 +198,12 @@ func (c *ReplicaClient) Snapshots(ctx context.Context, generation string) (_ lit
 	sftpClient, err := c.Init(ctx)
 	if err != nil {
 		return nil, err
-	} else if generation == "" {
-		return nil, fmt.Errorf("generation required")
 	}
 
-	dir := path.Join(c.Path, "generations", generation, "snapshots")
+	dir, err := litestream.SnapshotsPath(c.Path, generation)
+	if err != nil {
+		return nil, fmt.Errorf("cannot determine snapshots path: %w", err)
+	}
 
 	fis, err := sftpClient.ReadDir(dir)
 	if os.IsNotExist(err) {
@@ -215,7 +216,7 @@ func (c *ReplicaClient) Snapshots(ctx context.Context, generation string) (_ lit
 	infos := make([]litestream.SnapshotInfo, 0, len(fis))
 	for _, fi := range fis {
 		// Parse index from filename.
-		index, err := internal.ParseSnapshotPath(path.Base(fi.Name()))
+		index, err := litestream.ParseSnapshotPath(path.Base(fi.Name()))
 		if err != nil {
 			continue
 		}
@@ -240,11 +241,12 @@ func (c *ReplicaClient) WriteSnapshot(ctx context.Context, generation string, in
 	sftpClient, err := c.Init(ctx)
 	if err != nil {
 		return info, err
-	} else if generation == "" {
-		return info, fmt.Errorf("generation required")
 	}
 
-	filename := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")
+	filename, err := litestream.SnapshotPath(c.Path, generation, index)
+	if err != nil {
+		return info, fmt.Errorf("cannot determine snapshot path: %w", err)
+	}
 	startTime := time.Now()
 
 	if err := sftpClient.MkdirAll(path.Dir(filename)); err != nil {
@@ -284,11 +286,12 @@ func (c *ReplicaClient) SnapshotReader(ctx context.Context, generation string, i
 	sftpClient, err := c.Init(ctx)
 	if err != nil {
 		return nil, err
-	} else if generation == "" {
-		return nil, fmt.Errorf("generation required")
 	}
 
-	filename := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")
+	filename, err := litestream.SnapshotPath(c.Path, generation, index)
+	if err != nil {
+		return nil, fmt.Errorf("cannot determine snapshot path: %w", err)
+	}
 
 	f, err := sftpClient.Open(filename)
 	if err != nil {
@@ -307,11 +310,12 @@ func (c *ReplicaClient) DeleteSnapshot(ctx context.Context, generation string, i
 	sftpClient, err := c.Init(ctx)
 	if err != nil {
 		return err
-	} else if generation == "" {
-		return fmt.Errorf("generation required")
 	}
 
-	filename := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")
+	filename, err := litestream.SnapshotPath(c.Path, generation, index)
+	if err != nil {
+		return fmt.Errorf("cannot determine snapshot path: %w", err)
+	}
 
 	if err := sftpClient.Remove(filename); err != nil && !os.IsNotExist(err) {
 		return fmt.Errorf("cannot delete snapshot %q: %w", filename, err)
@@ -328,11 +332,12 @@ func (c *ReplicaClient) WALSegments(ctx context.Context, generation string) (_ l
 	sftpClient, err := c.Init(ctx)
 	if err != nil {
 		return nil, err
-	} else if generation == "" {
-		return nil, fmt.Errorf("generation required")
 	}
 
-	dir := path.Join(c.Path, "generations", generation, "wal")
+	dir, err := litestream.WALPath(c.Path, generation)
+	if err != nil {
+		return nil, fmt.Errorf("cannot determine wal path: %w", err)
+	}
 
 	fis, err := sftpClient.ReadDir(dir)
 	if os.IsNotExist(err) {
@@ -342,18 +347,25 @@ func (c *ReplicaClient) WALSegments(ctx context.Context, generation string) (_ l
 	}
 
 	// Iterate over every file and convert to metadata.
-	indexes := make([]int, 0, len(fis))
+	infos := make([]litestream.WALSegmentInfo, 0, len(fis))
 	for _, fi := range fis {
-		index, err := litestream.ParseIndex(fi.Name())
+		index, offset, err := litestream.ParseWALSegmentPath(path.Base(fi.Name()))
-		if err != nil || !fi.IsDir() {
+		if err != nil {
 			continue
 		}
-		indexes = append(indexes, index)
+
+		infos = append(infos, litestream.WALSegmentInfo{
+			Generation: generation,
+			Index:      index,
+			Offset:     offset,
+			Size:       fi.Size(),
+			CreatedAt:  fi.ModTime().UTC(),
+		})
 	}
 
-	sort.Ints(indexes)
+	sort.Sort(litestream.WALSegmentInfoSlice(infos))
 
-	return newWALSegmentIterator(ctx, c, dir, generation, indexes), nil
+	return litestream.NewWALSegmentInfoSliceIterator(infos), nil
 }
 
 // WriteWALSegment writes LZ4 compressed data from rd into a file on disk.
@@ -363,11 +375,12 @@ func (c *ReplicaClient) WriteWALSegment(ctx context.Context, pos litestream.Pos,
 	sftpClient, err := c.Init(ctx)
 	if err != nil {
 		return info, err
-	} else if pos.Generation == "" {
-		return info, fmt.Errorf("generation required")
 	}
 
-	filename := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
+	filename, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
+	if err != nil {
+		return info, fmt.Errorf("cannot determine wal segment path: %w", err)
+	}
 	startTime := time.Now()
 
 	if err := sftpClient.MkdirAll(path.Dir(filename)); err != nil {
@@ -407,11 +420,12 @@ func (c *ReplicaClient) WALSegmentReader(ctx context.Context, pos litestream.Pos
 	sftpClient, err := c.Init(ctx)
 	if err != nil {
 		return nil, err
-	} else if pos.Generation == "" {
-		return nil, fmt.Errorf("generation required")
 	}
 
-	filename := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
+	filename, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
+	if err != nil {
+		return nil, fmt.Errorf("cannot determine wal segment path: %w", err)
+	}
 
 	f, err := sftpClient.Open(filename)
 	if err != nil {
@@ -433,12 +447,11 @@ func (c *ReplicaClient) DeleteWALSegments(ctx context.Context, a []litestream.Po
 	}
 
 	for _, pos := range a {
-		if pos.Generation == "" {
+		filename, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
-			return fmt.Errorf("generation required")
+		if err != nil {
+			return fmt.Errorf("cannot determine wal segment path: %w", err)
 		}
 
-		filename := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
-
 		if err := sftpClient.Remove(filename); err != nil && !os.IsNotExist(err) {
 			return fmt.Errorf("cannot delete wal segment %q: %w", filename, err)
 		}
@@ -457,7 +470,7 @@ func (c *ReplicaClient) Cleanup(ctx context.Context) (err error) {
 		return err
 	}
 
-	if err := sftpClient.RemoveDirectory(path.Join(c.Path, "generations")); err != nil && !os.IsNotExist(err) {
+	if err := sftpClient.RemoveDirectory(litestream.GenerationsPath(c.Path)); err != nil && !os.IsNotExist(err) {
 		return fmt.Errorf("cannot delete generations path: %w", err)
 	} else if err := sftpClient.RemoveDirectory(c.Path); err != nil && !os.IsNotExist(err) {
 		return fmt.Errorf("cannot delete path: %w", err)
@@ -480,101 +493,3 @@ func (c *ReplicaClient) resetOnConnError(err error) {
 		c.sshClient = nil
 	}
 }
-
-type walSegmentIterator struct {
-	ctx        context.Context
-	client     *ReplicaClient
-	dir        string
-	generation string
-	indexes    []int
-
-	infos []litestream.WALSegmentInfo
-	err   error
-}
-
-func newWALSegmentIterator(ctx context.Context, client *ReplicaClient, dir, generation string, indexes []int) *walSegmentIterator {
-	return &walSegmentIterator{
-		ctx:        ctx,
-		client:     client,
-		dir:        dir,
-		generation: generation,
-		indexes:    indexes,
-	}
-}
-
-func (itr *walSegmentIterator) Close() (err error) {
-	return itr.err
-}
-
-func (itr *walSegmentIterator) Next() bool {
-	sftpClient, err := itr.client.Init(itr.ctx)
-	if err != nil {
-		itr.err = err
-		return false
-	}
-
-	// Exit if an error has already occurred.
-	if itr.err != nil {
-		return false
-	}
-
-	for {
-		// Move to the next segment in cache, if available.
-		if len(itr.infos) > 1 {
-			itr.infos = itr.infos[1:]
-			return true
-		}
-		itr.infos = itr.infos[:0] // otherwise clear infos
-
-		// Move to the next index unless this is the first time initializing.
-		if itr.infos != nil && len(itr.indexes) > 0 {
-			itr.indexes = itr.indexes[1:]
-		}
-
-		// If no indexes remain, stop iteration.
-		if len(itr.indexes) == 0 {
-			return false
-		}
-
-		// Read segments into a cache for the current index.
-		index := itr.indexes[0]
-		fis, err := sftpClient.ReadDir(path.Join(itr.dir, litestream.FormatIndex(index)))
-		if err != nil {
-			itr.err = err
-			return false
-		}
-
-		for _, fi := range fis {
-			filename := path.Base(fi.Name())
-			if fi.IsDir() {
-				continue
-			}
-
-			offset, err := litestream.ParseOffset(strings.TrimSuffix(filename, ".wal.lz4"))
-			if err != nil {
-				continue
-			}
-
-			itr.infos = append(itr.infos, litestream.WALSegmentInfo{
-				Generation: itr.generation,
-				Index:      index,
-				Offset:     offset,
-				Size:       fi.Size(),
-				CreatedAt:  fi.ModTime().UTC(),
-			})
-		}
-
-		if len(itr.infos) > 0 {
-			return true
-		}
-	}
-}
-
-func (itr *walSegmentIterator) Err() error { return itr.err }
-
-func (itr *walSegmentIterator) WALSegment() litestream.WALSegmentInfo {
-	if len(itr.infos) == 0 {
-		return litestream.WALSegmentInfo{}
-	}
-	return itr.infos[0]
-}