Enable S3 mock tests with moto (#545)

.github/workflows/commit.yml

@@ -91,6 +91,29 @@ jobs:
 #      - run: go install ./cmd/litestream
 #      - run: go test -v -run=TestCmd_Replicate_LongRunning ./integration -long-running-duration 1m
 
+  s3-mock-test:
+    name: Run S3 Mock Tests
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+#         cache: 'pip'
+      - run: pip install moto[s3,server]
+
+      - uses: actions/setup-go@v4
+        with:
+          go-version: ${{ env.GO_VERSION }}
+
+      - run: go env
+
+      - run: go install ./cmd/litestream
+
+      - run: ./etc/s3_mock.py go test -v ./replica_client_test.go -integration s3
+
 #  s3-integration-test:
 #    name: Run S3 Integration Tests
 #    runs-on: ubuntu-latest

etc/s3_mock.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+import sys
+import os
+import time
+from moto.server import ThreadedMotoServer
+import boto3
+import subprocess
+
+cmd = sys.argv[1:]
+if len(cmd) == 0:
+    print(f"usage: {sys.argv[0]} <command> [arguments]", file=sys.stderr)
+    sys.exit(1)
+
+env = os.environ.copy() | {
+    "LITESTREAM_S3_ACCESS_KEY_ID": "lite",
+    "LITESTREAM_S3_SECRET_ACCESS_KEY": "stream",
+    "LITESTREAM_S3_BUCKET": f"test{int(time.time())}",
+    "LITESTREAM_S3_ENDPOINT": "http://127.0.0.1:5000",
+    "LITESTREAM_S3_FORCE_PATH_STYLE": "true",
+}
+
+server = ThreadedMotoServer()
+server.start()
+
+s3 = boto3.client(
+    "s3",
+    aws_access_key_id=env["LITESTREAM_S3_ACCESS_KEY_ID"],
+    aws_secret_access_key=["LITESTREAM_S3_SECRET_ACCESS_KEY"],
+    endpoint_url=env["LITESTREAM_S3_ENDPOINT"]
+).create_bucket(Bucket=env["LITESTREAM_S3_BUCKET"])
+
+proc = subprocess.run(cmd, env=env)
+
+server.stop()
+sys.exit(proc.returncode)