Repository: benbjohnson/litestream
Pull request #474 (2023-04-28 09:24:50)

Copy WAL frames through temp file to shadow
This implementation replicates what the new behavior in the legacy branch did using a temporary file instead of memory to buffer WAL frames between commits.

Fixes excess memory use if the WAL includes massive commits due to big inserts or migrations.

A small refactor would remove the requirement of a temporary file that was already part of the legacy branch where we keep the cached valid position of the shadow WAL in the DB struct and seek the real WAL to the last valid position instead of expecting the file to be completely intact which isn't guaranteed. After that we can directly write the pages from real WAL to shadow WAL and not worry about partial pages being treated as part of the WAL.

hifi: As for why this matters, I created an extremely bad test case that forced the WAL to grow a lot within a single write transaction.

![image](https://user-images.githubusercontent.com/106598/235128915-16bfa0e0-2dfc-4a94-986b-9ebd950f1d35.png)

Between 10:05 and 10:18 I ran increasingly harder write transactions against a Litestreamed (downstream patched v0.3.9) database that did not have this backport from the legacy branch. Eventually the container went into OOMKill loop as every time Litestream started it would exhaust all of the RAM it was given.

After the gap I ran the same tests with this patch applied. I think because of gc pressure it needed even that much RAM as it did just to get through of everything but regardless it lived. Between 10:40 and 10:45 I dropped a 6 gigabyte table that would normally cause the same issue as Litestream would end up buffering that 6 gigs into RAM.



Patch:
diff --git a/.github/workflows/commit.yml b/.github/workflows/commit.yml
new file mode 100644
index 0000000..f3b9e18
--- /dev/null
+++ b/.github/workflows/commit.yml
@@ -0,0 +1,121 @@
+on: push
+
+jobs:
+  build:
+    name: Build & Unit Test
+    runs-on: ubuntu-latest
+    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-latest
+#    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-latest
+#    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: ${{ secrets.LITESTREAM_S3_SECRET_ACCESS_KEY }}
+#          LITESTREAM_S3_REGION: us-east-1
+#          LITESTREAM_S3_BUCKET: integration.litestream.io
+
+#  gcp-integration-test:
+#    name: Run GCP Integration Tests
+#    runs-on: ubuntu-latest
+#    needs: build
+#    steps:
+#      - name: Extract GCP credentials
+#        run: 'echo "$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-latest
+#    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:      ${{ secrets.LITESTREAM_ABS_ACCOUNT_KEY }}
+#          LITESTREAM_ABS_BUCKET:           integration
+
+#  sftp-integration-test:
+#    name: Run SFTP Integration Tests
+#    runs-on: ubuntu-latest
+#    needs: build
+#    steps:
+#      - name: Extract SSH key
+#        run: 'echo "$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:     ${{ secrets.LITESTREAM_SFTP_PATH }}
diff --git a/.github/workflows/release.docker.yml b/.github/workflows/release.docker.yml
index bf49245..b5e2747 100644
--- a/.github/workflows/release.docker.yml
+++ b/.github/workflows/release.docker.yml
@@ -15,7 +15,7 @@ jobs:
   docker:
     runs-on: ubuntu-latest
     env:
-      PLATFORMS: "linux/amd64,linux/arm64,linux/arm/v7"
+      PLATFORMS: "linux/amd64,linux/arm64"
       VERSION: "${{ github.event_name == 'release' && github.event.release.name || github.sha }}"
 
     steps:
diff --git a/.github/workflows/release.linux.yml b/.github/workflows/release.linux.yml
index ce80a95..b06c61e 100644
--- a/.github/workflows/release.linux.yml
+++ b/.github/workflows/release.linux.yml
@@ -6,7 +6,7 @@ on:
 name: release (linux)
 jobs:
   build:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         include:
@@ -31,7 +31,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.16'
+          go-version: '1.20'
 
       - id: release
         uses: bruceadams/get-release@v1.2.2
@@ -54,7 +54,7 @@ jobs:
           mkdir -p dist
           cp etc/litestream.yml etc/litestream.service dist
           cat etc/nfpm.yml | LITESTREAM_VERSION=${{ steps.release.outputs.tag_name }} envsubst > dist/nfpm.yml
-          CGO_ENABLED=1 go build -ldflags "-s -w -X 'main.Version=${{ steps.release.outputs.tag_name }}'" -o dist/litestream ./cmd/litestream
+          CGO_ENABLED=1 go build -ldflags "-s -w -extldflags "-static" -X 'main.Version=${{ steps.release.outputs.tag_name }}'" -tags osusergo,netgo,sqlite_omit_load_extension -o dist/litestream ./cmd/litestream
           
           cd dist
           tar -czvf litestream-${{ steps.release.outputs.tag_name }}-${{ env.GOOS }}-${{ env.GOARCH }}${{ env.GOARM }}.tar.gz litestream
diff --git a/.github/workflows/release.linux_static.yml b/.github/workflows/release.linux_static.yml
deleted file mode 100644
index ddc90b9..0000000
--- a/.github/workflows/release.linux_static.yml
+++ /dev/null
@@ -1,62 +0,0 @@
-on:
-  release:
-    types:
-      - created
-
-name: release (linux/static)
-jobs:
-  build:
-    runs-on: ubuntu-18.04
-    strategy:
-      matrix:
-        include:
-          - arch: amd64
-            cc:   gcc
-          - arch: arm64
-            cc:   aarch64-linux-gnu-gcc
-          - arch: arm
-            arm:  6
-            cc:   arm-linux-gnueabi-gcc
-          - arch: arm
-            arm:  7
-            cc:   arm-linux-gnueabihf-gcc
-
-    env:
-      GOOS:   linux
-      GOARCH: ${{ matrix.arch }}
-      GOARM:  ${{ matrix.arm }}
-      CC:     ${{ matrix.cc }}
-
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-go@v2
-        with:
-          go-version: '1.16'
-
-      - id: release
-        uses: bruceadams/get-release@v1.2.2
-        env:
-          GITHUB_TOKEN: ${{ github.token }}
-
-      - name: Install cross-compilers
-        run: |
-          sudo apt-get update 
-          sudo apt-get install -y gcc-aarch64-linux-gnu gcc-arm-linux-gnueabihf gcc-arm-linux-gnueabi
-
-      - name: Build litestream
-        run: |
-          rm -rf dist
-          mkdir -p dist
-          CGO_ENABLED=1 go build -ldflags "-s -w -extldflags "-static" -X 'main.Version=${{ steps.release.outputs.tag_name }}'" -tags osusergo,netgo,sqlite_omit_load_extension -o dist/litestream ./cmd/litestream
-          cd dist
-          tar -czvf litestream-${{ steps.release.outputs.tag_name }}-${{ env.GOOS }}-${{ env.GOARCH }}${{ env.GOARM }}-static.tar.gz litestream
-
-      - name: Upload release tarball
-        uses: actions/upload-release-asset@v1.0.2
-        env:
-          GITHUB_TOKEN: ${{ github.token }}
-        with:
-          upload_url: ${{ steps.release.outputs.upload_url }}
-          asset_path: ./dist/litestream-${{ steps.release.outputs.tag_name }}-${{ env.GOOS }}-${{ env.GOARCH }}${{ env.GOARM }}-static.tar.gz
-          asset_name: litestream-${{ steps.release.outputs.tag_name }}-${{ env.GOOS }}-${{ env.GOARCH }}${{ env.GOARM }}-static.tar.gz
-          asset_content_type: application/gzip
diff --git a/Dockerfile b/Dockerfile
index c0dd0cc..631510e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.17 as builder
+FROM golang:1.20.1 as builder
 
 WORKDIR /src/litestream
 COPY . .
@@ -10,7 +10,7 @@ RUN --mount=type=cache,target=/root/.cache/go-build \
 	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 []
diff --git a/README.md b/README.md
index 06856c3..84d6e4e 100644
--- a/README.md
+++ b/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.
diff --git a/db.go b/db.go
index dd33d7e..c5c4de7 100644
--- a/db.go
+++ b/db.go
@@ -44,11 +44,13 @@ 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
 	pageSize int           // page size, in bytes
 	notify   chan struct{} // closes on WAL change
+	chkMu    sync.Mutex    // checkpoint lock
 
 	fileInfo os.FileInfo // db info cached during init
 	dirInfo  os.FileInfo // parent dir info cached during init
@@ -94,18 +96,26 @@ 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,
-		notify: make(chan struct{}),
+		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)
@@ -142,20 +152,24 @@ 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 filepath.Join(dir, "."+file+MetaDirSuffix)
+	return db.metaPath
+}
+
+// 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.
@@ -278,7 +292,7 @@ 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)
 	}
 
@@ -291,20 +305,9 @@ func (db *DB) Open() (err error) {
 	return nil
 }
 
-// Close releases the read lock & closes the database. This method should only
-// be called by tests as it causes the underlying database to be checkpointed.
+// Close flushes outstanding WAL writes to replicas, releases the read lock,
+// 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()
 
@@ -325,7 +328,7 @@ 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.
@@ -335,9 +338,7 @@ func (db *DB) close(soft bool) (err error) {
 		}
 	}
 
-	// Only perform full close if this is not a soft close.
-	// This closes the underlying database connection which can clean up the WAL.
-	if !soft && db.db != nil {
+	if db.db != nil {
 		if e := db.db.Close(); e != nil && err == nil {
 			err = e
 		}
@@ -392,8 +393,9 @@ func (db *DB) init() (err error) {
 	dsn := db.path
 	dsn += fmt.Sprintf("?_busy_timeout=%d", BusyTimeout.Milliseconds())
 
-	// Connect to SQLite database.
-	if db.db, err = sql.Open("sqlite3", dsn); err != nil {
+	// Connect to SQLite database. Use the driver registered with a hook to
+	// prevent WAL files from being removed.
+	if db.db, err = sql.Open("litestream-sqlite3", dsn); err != nil {
 		return err
 	}
 
@@ -453,13 +455,13 @@ 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)
 		}
@@ -529,7 +531,7 @@ 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
@@ -659,7 +661,7 @@ 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
 	}
@@ -738,7 +740,7 @@ 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)
@@ -1022,6 +1024,16 @@ func (db *DB) copyToShadowWAL(filename string) (newSize int64, err error) {
 		return 0, fmt.Errorf("last checksum: %w", err)
 	}
 
+	// Write to a temporary shadow file.
+	tempFilename := filename + ".tmp"
+	defer os.Remove(tempFilename)
+
+	f, err := internal.CreateFile(tempFilename, db.fileInfo)
+	if err != nil {
+		return 0, fmt.Errorf("create temp file: %w", err)
+	}
+	defer f.Close()
+
 	// Seek to correct position on real wal.
 	if _, err := r.Seek(origSize, io.SeekStart); err != nil {
 		return 0, fmt.Errorf("real wal seek: %w", err)
@@ -1032,7 +1044,6 @@ func (db *DB) copyToShadowWAL(filename string) (newSize int64, err error) {
 	// Read through WAL from last position to find the page of the last
 	// committed transaction.
 	frame := make([]byte, db.pageSize+WALFrameHeaderSize)
-	var buf bytes.Buffer
 	offset := origSize
 	lastCommitSize := origSize
 	for {
@@ -1062,24 +1073,46 @@ func (db *DB) copyToShadowWAL(filename string) (newSize int64, err error) {
 			break
 		}
 
-		// Add page to the new size of the shadow WAL.
-		buf.Write(frame)
+		// Write page to temporary WAL file.
+		if _, err := f.Write(frame); err != nil {
+			return 0, fmt.Errorf("write temp shadow wal: %w", err)
+		}
 
 		Tracef("%s: copy-shadow: ok %s offset=%d salt=%x %x", db.path, filename, offset, salt0, salt1)
 		offset += int64(len(frame))
 
-		// Flush to shadow WAL if commit record.
+		// Update new size if written frame was a commit record.
 		newDBSize := binary.BigEndian.Uint32(frame[4:])
 		if newDBSize != 0 {
-			if _, err := buf.WriteTo(w); err != nil {
-				return 0, fmt.Errorf("write shadow wal: %w", err)
-			}
-			buf.Reset()
 			lastCommitSize = offset
 		}
 	}
 
-	// Sync & close.
+	// If no WAL writes found, exit.
+	if origSize == lastCommitSize {
+		return origSize, nil
+	}
+
+	walByteN := lastCommitSize - origSize
+
+	// Move to beginning of temporary file.
+	if _, err := f.Seek(0, io.SeekStart); err != nil {
+		return 0, fmt.Errorf("temp file seek: %w", err)
+	}
+
+	// Copy from temporary file to shadow WAL.
+	if _, err := io.Copy(w, &io.LimitedReader{R: f, N: walByteN}); err != nil {
+		return 0, fmt.Errorf("write shadow file: %w", err)
+	}
+
+	// Close & remove temporary file.
+	if err := f.Close(); err != nil {
+		return 0, err
+	} else if err := os.Remove(tempFilename); err != nil {
+		return 0, err
+	}
+
+	// Sync & close shadow WAL.
 	if err := w.Sync(); err != nil {
 		return 0, err
 	} else if err := w.Close(); err != nil {
@@ -1087,7 +1120,7 @@ func (db *DB) copyToShadowWAL(filename string) (newSize int64, err error) {
 	}
 
 	// Track total number of bytes written to WAL.
-	db.totalWALBytesCounter.Add(float64(lastCommitSize - origSize))
+	db.totalWALBytesCounter.Add(float64(walByteN))
 
 	return lastCommitSize, nil
 }
@@ -1246,6 +1279,12 @@ func (db *DB) Checkpoint(ctx context.Context, mode string) (err error) {
 // checkpointAndInit performs a checkpoint on the WAL file and initializes a
 // new shadow WAL file.
 func (db *DB) checkpoint(ctx context.Context, generation, mode string) error {
+	// Try getting a checkpoint lock, will fail during snapshots.
+	if !db.chkMu.TryLock() {
+		return nil
+	}
+	defer db.chkMu.Unlock()
+
 	shadowWALPath, err := db.CurrentShadowWALPath(generation)
 	if err != nil {
 		return err
@@ -1377,7 +1416,7 @@ 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)
 		}
 	}
 }
@@ -1419,7 +1458,7 @@ 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
 	}
@@ -1481,6 +1520,19 @@ func (db *DB) CRC64(ctx context.Context) (uint64, Pos, error) {
 	return h.Sum64(), pos, nil
 }
 
+// BeginSnapshot takes an internal snapshot lock preventing checkpoints.
+//
+// When calling this the caller must also call EndSnapshot() once the snapshot
+// is finished.
+func (db *DB) BeginSnapshot() {
+	db.chkMu.Lock()
+}
+
+// EndSnapshot releases the internal snapshot lock that prevents checkpoints.
+func (db *DB) EndSnapshot() {
+	db.chkMu.Unlock()
+}
+
 // DefaultRestoreParallelism is the default parallelism when downloading WAL files.
 const DefaultRestoreParallelism = 8
 
diff --git a/go.mod b/go.mod
index 928c4d3..9c49a43 100644
--- a/go.mod
+++ b/go.mod
@@ -1,19 +1,55 @@
 module github.com/benbjohnson/litestream
 
-go 1.16
+go 1.19
 
 require (
-	cloud.google.com/go/storage v1.15.0
-	github.com/Azure/azure-storage-blob-go v0.13.0
-	github.com/aws/aws-sdk-go v1.27.0
-	github.com/mattn/go-shellwords v1.0.11
-	github.com/mattn/go-sqlite3 v1.14.12
-	github.com/pierrec/lz4/v4 v4.1.15
-	github.com/pkg/sftp v1.13.0
-	github.com/prometheus/client_golang v1.12.2
-	golang.org/x/crypto v0.0.0-20210513164829-c07d793c2f9a
-	golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4
-	golang.org/x/sys v0.0.0-20220114195835-da31bd327af9
-	google.golang.org/api v0.45.0
+	cloud.google.com/go/storage v1.31.0
+	filippo.io/age v1.1.1
+	github.com/Azure/azure-storage-blob-go v0.15.0
+	github.com/aws/aws-sdk-go v1.44.318
+	github.com/mattn/go-shellwords v1.0.12
+	github.com/mattn/go-sqlite3 v1.14.17
+	github.com/pierrec/lz4/v4 v4.1.18
+	github.com/pkg/sftp v1.13.5
+	github.com/prometheus/client_golang v1.16.0
+	golang.org/x/crypto v0.12.0
+	golang.org/x/sync v0.3.0
+	golang.org/x/sys v0.11.0
+	google.golang.org/api v0.135.0
 	gopkg.in/yaml.v2 v2.4.0
 )
+
+require (
+	cloud.google.com/go v0.110.7 // indirect
+	cloud.google.com/go/compute v1.23.0 // indirect
+	cloud.google.com/go/compute/metadata v0.2.3 // indirect
+	cloud.google.com/go/iam v1.1.1 // indirect
+	github.com/Azure/azure-pipeline-go v0.2.3 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/google/go-cmp v0.5.9 // indirect
+	github.com/google/s2a-go v0.1.4 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.2.5 // indirect
+	github.com/googleapis/gax-go/v2 v2.12.0 // indirect
+	github.com/jmespath/go-jmespath v0.4.0 // indirect
+	github.com/kr/fs v0.1.0 // indirect
+	github.com/mattn/go-ieproxy v0.0.11 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
+	github.com/prometheus/client_model v0.4.0 // indirect
+	github.com/prometheus/common v0.44.0 // indirect
+	github.com/prometheus/procfs v0.11.1 // indirect
+	go.opencensus.io v0.24.0 // indirect
+	golang.org/x/net v0.14.0 // indirect
+	golang.org/x/oauth2 v0.11.0 // indirect
+	golang.org/x/text v0.12.0 // indirect
+	golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
+	google.golang.org/genproto v0.0.0-20230807174057-1744710a1577 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20230807174057-1744710a1577 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20230807174057-1744710a1577 // indirect
+	google.golang.org/grpc v1.57.0 // indirect
+	google.golang.org/protobuf v1.31.0 // indirect
+)
diff --git a/go.sum b/go.sum
index 4cc7c98..79a3b89 100644
--- a/go.sum
+++ b/go.sum
@@ -1,123 +1,70 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
-cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
-cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
-cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
-cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
-cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
-cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
-cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
-cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
-cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI=
-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/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/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/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=
-cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
-cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
-cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
-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 v1.15.0/go.mod h1:mjjQMoxxyGH7Jr8K5qrx6N2O0AHsczI61sMNn03GIZI=
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+cloud.google.com/go v0.110.7 h1:rJyC7nWRg2jWGZ4wSJ5nY65GTdYJkg0cd/uXb+ACI6o=
+cloud.google.com/go v0.110.7/go.mod h1:+EYjdK8e5RME/VY/qLCAtuyALQ9q67dvuum8i+H5xsI=
+cloud.google.com/go/compute v1.23.0 h1:tP41Zoavr8ptEqaW6j+LQOnyBBhO7OkOMAGrgLopTwY=
+cloud.google.com/go/compute v1.23.0/go.mod h1:4tCnrn48xsqlwSAiLf1HXMQk8CONslYbdiEZc9FEIbM=
+cloud.google.com/go/compute/metadata v0.2.3 h1:mg4jlk7mCAj6xXp9UJ4fjI9VUI5rubuGBW5aJ7UnBMY=
+cloud.google.com/go/compute/metadata v0.2.3/go.mod h1:VAV5nSsACxMJvgaAuX6Pk2AawlZn8kiOGuCv6gTkwuA=
+cloud.google.com/go/iam v1.1.1 h1:lW7fzj15aVIXYHREOqjRBV9PsH0Z6u8Y46a1YGvQP4Y=
+cloud.google.com/go/iam v1.1.1/go.mod h1:A5avdyVL2tCppe4unb0951eI9jreack+RJ0/d+KUZOU=
+cloud.google.com/go/storage v1.31.0 h1:+S3LjjEN2zZ+L5hOwj4+1OkGCsLVe0NzpXKQ1pSdTCI=
+cloud.google.com/go/storage v1.31.0/go.mod h1:81ams1PrhW16L4kF7qg+4mTq7SRs5HsbDTM0bWvrwJ0=
+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 v0.13.0/go.mod h1:pA9kNqtjUeQF2zOSu4s//nUdBD+e64lEuc4sVnuOfNs=
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 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=
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-github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
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 github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
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 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
@@ -594,34 +267,21 @@ google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzi
 google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0 h1:bxAC2xTBsZGibn2RTntX0oH50xLsqy1OxA9tTL3p/lk=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
+google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f h1:BLraFXnmrev5lT+xlilqcH8XK9/i0At2xKjWk4p6zsU=
-gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/yaml.v2 v2.2.2/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 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8/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=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 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=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
-honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
-honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
-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=
diff --git a/replica.go b/replica.go
index 3cf81f2..b633123 100644
--- a/replica.go
+++ b/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
@@ -221,8 +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())
@@ -270,9 +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
 	}
@@ -334,6 +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
@@ -431,6 +463,10 @@ func (r *Replica) Snapshot(ctx context.Context) (info SnapshotInfo, err error) {
 	r.muf.Lock()
 	defer r.muf.Unlock()
 
+	// Prevent checkpoints during snapshot.
+	r.db.BeginSnapshot()
+	defer r.db.EndSnapshot()
+
 	// Issue a passive checkpoint to flush any pages to disk before snapshotting.
 	if _, err := r.db.db.ExecContext(ctx, `PRAGMA wal_checkpoint(PASSIVE);`); err != nil {
 		return info, fmt.Errorf("pre-snapshot checkpoint: %w", err)
@@ -470,7 +506,23 @@ 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 {
@@ -480,7 +532,7 @@ 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.
@@ -490,7 +542,7 @@ 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
 }
@@ -558,7 +610,7 @@ 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()
@@ -590,7 +642,7 @@ 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
 }
@@ -627,7 +679,7 @@ 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
 		}
 	}
@@ -655,7 +707,7 @@ 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
 			}
 		}
@@ -677,7 +729,7 @@ 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
 			}
 		}
@@ -705,7 +757,7 @@ 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
 			}
 		}
@@ -742,7 +794,7 @@ 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)
 	}
@@ -767,7 +819,7 @@ 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 {
@@ -809,7 +861,7 @@ 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
 		}
 
@@ -964,7 +1016,7 @@ 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()
@@ -1259,6 +1311,15 @@ 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 {
@@ -1285,6 +1346,16 @@ 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))
 	}
 
diff --git a/s3/replica_client.go b/s3/replica_client.go
index b68628a..6919eae 100644
--- a/s3/replica_client.go
+++ b/s3/replica_client.go
@@ -16,7 +16,6 @@ import (
 	"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"
@@ -93,6 +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)
@@ -105,7 +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, "")
 	}
@@ -208,10 +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()
@@ -303,10 +308,14 @@ func (c *ReplicaClient) DeleteSnapshot(ctx context.Context, generation string, i
 		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
 	}
 
@@ -405,13 +414,16 @@ func (c *ReplicaClient) DeleteWALSegments(ctx context.Context, a []litestream.Po
 		}
 
 		// 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:]
@@ -454,10 +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()
@@ -737,3 +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)
+	}
+}


Test patch:
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
deleted file mode 100644
index d2a5edd..0000000
--- a/.github/workflows/test.yml
+++ /dev/null
@@ -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:            us-east-1
-          LITESTREAM_S3_BUCKET:            integration.litestream.io
-
-      - 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:           integration.litestream.io
-
-      - 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:           integration
-
-      - name: Run sftp tests
-        run: go test -v -run=TestReplicaClient . -integration sftp
-        env:
-          LITESTREAM_SFTP_HOST:     litestream-test-sftp.fly.dev:2222
-          LITESTREAM_SFTP_USER:     litestream
-          LITESTREAM_SFTP_KEY_PATH: /opt/id_ed25519
-          LITESTREAM_SFTP_PATH:     /litestream
diff --git a/cmd/litestream/main.go b/cmd/litestream/main.go
index d186f61..3bb20c1 100644
--- a/cmd/litestream/main.go
+++ b/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() {
diff --git a/cmd/litestream/replicate.go b/cmd/litestream/replicate.go
index 7c0403b..cd95d96 100644
--- a/cmd/litestream/replicate.go
+++ b/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
diff --git a/db_test.go b/db_test.go
index b7eb54b..ef82987 100644
--- a/db_test.go
+++ b/db_test.go
@@ -270,8 +270,8 @@ func TestDB_Sync(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		// Verify WAL does not exist.
-		if _, err := os.Stat(db.WALPath()); !os.IsNotExist(err) {
+		// Remove WAL file.
+		if err := os.Remove(db.WALPath()); err != nil {
 			t.Fatal(err)
 		}
 
diff --git a/litestream.go b/litestream.go
index c895ac3..3fa3474 100644
--- a/litestream.go
+++ b/litestream.go
@@ -13,6 +13,8 @@ import (
 	"strconv"
 	"strings"
 	"time"
+
+	"github.com/mattn/go-sqlite3"
 )
 
 // Naming constants.
@@ -42,6 +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