scanner

lib/model/folder_sendrecv.go

@@ -1139,12 +1139,12 @@ func (f *sendReceiveFolder) handleFile(file protocol.FileInfo, snap *db.Snapshot
 func (f *sendReceiveFolder) reuseBlocks(blocks []protocol.BlockInfo, reused []int, file protocol.FileInfo, tempName string) ([]protocol.BlockInfo, []int) {
 	// Check for an old temporary file which might have some blocks we could
 	// reuse.
-	tempBlocks, err := scanner.HashFile(f.ctx, f.mtimefs, tempName, file.BlockSize(), nil, false)
+	tempBlocks, err := scanner.HashFile(f.ctx, f.ID, f.mtimefs, tempName, file.BlockSize(), nil, false)
 	if err != nil {
 		var caseErr *fs.ErrCaseConflict
 		if errors.As(err, &caseErr) {
 			if rerr := f.mtimefs.Rename(caseErr.Real, tempName); rerr == nil {
-				tempBlocks, err = scanner.HashFile(f.ctx, f.mtimefs, tempName, file.BlockSize(), nil, false)
+				tempBlocks, err = scanner.HashFile(f.ctx, f.ID, f.mtimefs, tempName, file.BlockSize(), nil, false)
 			}
 		}
 	}

lib/model/folder_sendrecv_test.go

@@ -299,7 +299,7 @@ func TestCopierFinder(t *testing.T) {
 	}
 
 	// Verify that the fetched blocks have actually been written to the temp file
-	blks, err := scanner.HashFile(context.TODO(), f.Filesystem(nil), tempFile, protocol.MinBlockSize, nil, false)
+	blks, err := scanner.HashFile(context.TODO(), f.ID, f.Filesystem(nil), tempFile, protocol.MinBlockSize, nil, false)
 	if err != nil {
 		t.Log(err)
 	}

lib/scanner/blockqueue.go

@@ -16,7 +16,7 @@ import (
 )
 
 // HashFile hashes the files and returns a list of blocks representing the file.
-func HashFile(ctx context.Context, fs fs.Filesystem, path string, blockSize int, counter Counter, useWeakHashes bool) ([]protocol.BlockInfo, error) {
+func HashFile(ctx context.Context, folderID string, fs fs.Filesystem, path string, blockSize int, counter Counter, useWeakHashes bool) ([]protocol.BlockInfo, error) {
 	fd, err := fs.Open(path)
 	if err != nil {
 		l.Debugln("open:", err)
@@ -42,6 +42,8 @@ func HashFile(ctx context.Context, fs fs.Filesystem, path string, blockSize int,
 		return nil, err
 	}
 
+	metricHashesBytes.WithLabelValues(folderID).Add(float64(size))
+
 	// Recheck the size and modtime again. If they differ, the file changed
 	// while we were reading it and our hash results are invalid.
 
@@ -62,6 +64,7 @@ func HashFile(ctx context.Context, fs fs.Filesystem, path string, blockSize int,
 // workers are used in parallel. The outbox will become closed when the inbox
 // is closed and all items handled.
 type parallelHasher struct {
+	folderID string
 	fs       fs.Filesystem
 	outbox   chan<- ScanResult
 	inbox    <-chan protocol.FileInfo
@@ -70,8 +73,9 @@ type parallelHasher struct {
 	wg       sync.WaitGroup
 }
 
-func newParallelHasher(ctx context.Context, fs fs.Filesystem, workers int, outbox chan<- ScanResult, inbox <-chan protocol.FileInfo, counter Counter, done chan<- struct{}) {
+func newParallelHasher(ctx context.Context, folderID string, fs fs.Filesystem, workers int, outbox chan<- ScanResult, inbox <-chan protocol.FileInfo, counter Counter, done chan<- struct{}) {
 	ph := &parallelHasher{
+		folderID: folderID,
 		fs:       fs,
 		outbox:   outbox,
 		inbox:    inbox,
@@ -104,7 +108,7 @@ func (ph *parallelHasher) hashFiles(ctx context.Context) {
 				panic("Bug. Asked to hash a directory or a deleted file.")
 			}
 
-			blocks, err := HashFile(ctx, ph.fs, f.Name, f.BlockSize(), ph.counter, true)
+			blocks, err := HashFile(ctx, ph.folderID, ph.fs, f.Name, f.BlockSize(), ph.counter, true)
 			if err != nil {
 				handleError(ctx, "hashing", f.Name, err, ph.outbox)
 				continue

lib/scanner/metrics.go

@@ -0,0 +1,35 @@
+// Copyright (C) 2023 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package scanner
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+)
+
+var (
+	metricHashesBytes = promauto.NewCounterVec(prometheus.CounterOpts{
+		Namespace: "syncthing",
+		Subsystem: "scanner",
+		Name:      "hashed_bytes_total",
+		Help:      "Total amount of data hashed",
+	}, []string{"folder"})
+
+	metricScannedItems = promauto.NewCounterVec(prometheus.CounterOpts{
+		Namespace: "syncthing",
+		Subsystem: "scanner",
+		Name:      "scanned_items_total",
+		Help:      "Total number of files/directories inspected",
+	}, []string{"folder"})
+)
+
+func registerFolderMetrics(folderID string) {
+	// Register metrics for this folder, so that counters are present even
+	// when zero.
+	metricHashesBytes.WithLabelValues(folderID)
+	metricScannedItems.WithLabelValues(folderID)
+}

lib/scanner/walk.go

@@ -132,7 +132,7 @@ func (w *walker) walk(ctx context.Context) chan ScanResult {
 	// We're not required to emit scan progress events, just kick off hashers,
 	// and feed inputs directly from the walker.
 	if w.ProgressTickIntervalS < 0 {
-		newParallelHasher(ctx, w.Filesystem, w.Hashers, finishedChan, toHashChan, nil, nil)
+		newParallelHasher(ctx, w.Folder, w.Filesystem, w.Hashers, finishedChan, toHashChan, nil, nil)
 		return finishedChan
 	}
 
@@ -163,7 +163,7 @@ func (w *walker) walk(ctx context.Context) chan ScanResult {
 		done := make(chan struct{})
 		progress := newByteCounter()
 
-		newParallelHasher(ctx, w.Filesystem, w.Hashers, finishedChan, realToHashChan, progress, done)
+		newParallelHasher(ctx, w.Folder, w.Filesystem, w.Hashers, finishedChan, realToHashChan, progress, done)
 
 		// A routine which actually emits the FolderScanProgress events
 		// every w.ProgressTicker ticks, until the hasher routines terminate.
@@ -255,6 +255,8 @@ func (w *walker) walkAndHashFiles(ctx context.Context, toHashChan chan<- protoco
 		default:
 		}
 
+		metricScannedItems.WithLabelValues(w.Folder).Inc()
+
 		// Return value used when we are returning early and don't want to
 		// process the item. For directories, this means do-not-descend.
 		var skip error // nil
@@ -599,7 +601,7 @@ func (w *walker) updateFileInfo(dst, src protocol.FileInfo) protocol.FileInfo {
 	if dst.Type == protocol.FileInfoTypeFile && build.IsWindows {
 		// If we have an existing index entry, copy the executable bits
 		// from there.
-		dst.Permissions |= (src.Permissions & 0111)
+		dst.Permissions |= (src.Permissions & 0o111)
 	}
 	dst.Version = src.Version.Update(w.ShortID)
 	dst.ModifiedBy = w.ShortID

lib/scanner/walk_test.go

@@ -635,7 +635,7 @@ func BenchmarkHashFile(b *testing.B) {
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
-		if _, err := HashFile(context.TODO(), testFs, testdataName, protocol.MinBlockSize, nil, true); err != nil {
+		if _, err := HashFile(context.TODO(), "", testFs, testdataName, protocol.MinBlockSize, nil, true); err != nil {
 			b.Fatal(err)
 		}
 	}