fix: remove deprecated ioutil and rand calls

- Change ioutil to io and os calls per Go 1.16 deprecation
- Move global random to localized random source

cmd/litestream/main.go

@@ -6,7 +6,6 @@ import (
 	"flag"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"net/url"
 	"os"
@@ -253,7 +252,7 @@ func readConfigFile(filename string, expandEnv bool) (_ Config, err error) {
 
 	// Read configuration.
 	// Do not return an error if using default path and file is missing.
-	buf, err := ioutil.ReadFile(filename)
+	buf, err := os.ReadFile(filename)
 	if err != nil {
 		return config, err
 	}

cmd/litestream/main_test.go

@@ -3,7 +3,6 @@ package main_test
 import (
 	"bytes"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -23,7 +22,7 @@ func TestReadConfigFile(t *testing.T) {
 	// Ensure global AWS settings are propagated down to replica configurations.
 	t.Run("PropagateGlobalSettings", func(t *testing.T) {
 		filename := filepath.Join(t.TempDir(), "litestream.yml")
-		if err := ioutil.WriteFile(filename, []byte(`
+		if err := os.WriteFile(filename, []byte(`
 access-key-id: XXX
 secret-access-key: YYY
 
@@ -55,7 +54,7 @@ dbs:
 		os.Setenv("LITESTREAM_TEST_1872363", "s3://foo/bar")
 
 		filename := filepath.Join(t.TempDir(), "litestream.yml")
-		if err := ioutil.WriteFile(filename, []byte(`
+		if err := os.WriteFile(filename, []byte(`
 dbs:
   - path: $LITESTREAM_TEST_0129380
     replicas:
@@ -82,7 +81,7 @@ dbs:
 		os.Setenv("LITESTREAM_TEST_9847533", "s3://foo/bar")
 
 		filename := filepath.Join(t.TempDir(), "litestream.yml")
-		if err := ioutil.WriteFile(filename, []byte(`
+		if err := os.WriteFile(filename, []byte(`
 dbs:
   - path: /path/to/db
     replicas:

db.go

@@ -9,7 +9,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"math/rand"
 	"os"
@@ -292,7 +291,7 @@ func (db *DB) invalidatePos(ctx context.Context) error {
 	}
 	defer rd.Close()
 
-	n, err := io.Copy(ioutil.Discard, lz4.NewReader(rd))
+	n, err := io.Copy(io.Discard, lz4.NewReader(rd))
 	if err != nil {
 		return err
 	}
@@ -671,7 +670,7 @@ func (db *DB) cleanGenerations(ctx context.Context) error {
 	}
 
 	dir := filepath.Join(db.MetaPath(), "generations")
-	fis, err := ioutil.ReadDir(dir)
+	fis, err := os.ReadDir(dir)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {

file_replica_client.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"sort"
@@ -111,7 +110,7 @@ func (c *FileReplicaClient) Generations(ctx context.Context) ([]string, error) {
 		return nil, fmt.Errorf("cannot determine generations path: %w", err)
 	}
 
-	fis, err := ioutil.ReadDir(root)
+	fis, err := os.ReadDir(root)
 	if os.IsNotExist(err) {
 		return nil, nil
 	} else if err != nil {

integration/replica_client_test.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"flag"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"math/rand"
 	"os"
 	"path"
@@ -22,12 +22,13 @@ import (
 )
 
 func init() {
-	rand.Seed(time.Now().UnixNano())
+	localRand = rand.New(rand.NewSource(time.Now().UnixNano()))
 }
 
 var (
 	// Enables integration tests.
 	replicaType = flag.String("replica-type", "file", "")
+	localRand   *rand.Rand
 )
 
 // S3 settings
@@ -193,7 +194,7 @@ func TestReplicaClient_WriteSnapshot(t *testing.T) {
 
 		if r, err := c.SnapshotReader(context.Background(), "b16ddcf5c697540f", 1000); err != nil {
 			t.Fatal(err)
-		} else if buf, err := ioutil.ReadAll(r); err != nil {
+		} else if buf, err := io.ReadAll(r); err != nil {
 			t.Fatal(err)
 		} else if err := r.Close(); err != nil {
 			t.Fatal(err)
@@ -224,7 +225,7 @@ func TestReplicaClient_SnapshotReader(t *testing.T) {
 		}
 		defer r.Close()
 
-		if buf, err := ioutil.ReadAll(r); err != nil {
+		if buf, err := io.ReadAll(r); err != nil {
 			t.Fatal(err)
 		} else if got, want := string(buf), "foo"; got != want {
 			t.Fatalf("ReadAll=%v, want %v", got, want)
@@ -378,7 +379,7 @@ func TestReplicaClient_WriteWALSegment(t *testing.T) {
 
 		if r, err := c.WALSegmentReader(context.Background(), litestream.Pos{Generation: "b16ddcf5c697540f", Index: 1000, Offset: 2000}); err != nil {
 			t.Fatal(err)
-		} else if buf, err := ioutil.ReadAll(r); err != nil {
+		} else if buf, err := io.ReadAll(r); err != nil {
 			t.Fatal(err)
 		} else if err := r.Close(); err != nil {
 			t.Fatal(err)
@@ -409,7 +410,7 @@ func TestReplicaClient_WALSegmentReader(t *testing.T) {
 		}
 		defer r.Close()
 
-		if buf, err := ioutil.ReadAll(r); err != nil {
+		if buf, err := io.ReadAll(r); err != nil {
 			t.Fatal(err)
 		} else if got, want := string(buf), "foobar"; got != want {
 			t.Fatalf("ReadAll=%v, want %v", got, want)

replica.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"sort"
@@ -375,7 +374,7 @@ func (r *Replica) calcPos(ctx context.Context, generation string) (pos Pos, err
 	}
 	defer rd.Close()
 
-	n, err := io.Copy(ioutil.Discard, lz4.NewReader(rd))
+	n, err := io.Copy(io.Discard, lz4.NewReader(rd))
 	if err != nil {
 		return pos, err
 	}