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76af9ba53d
This implements a new debug/trace infrastructure based on a slightly
hacked up logger. Instead of the traditional "if debug { ... }" I've
rewritten the logger to have no-op Debugln and Debugf, unless debugging
has been enabled for a given "facility". The "facility" is just a
string, typically a package name.
This will be slightly slower than before; but not that much as it's
mostly a function call that returns immediately. For the cases where it
matters (the Debugln takes a hex.Dump() of something for example, and
it's not in a very occasional "if err != nil" branch) there is an
l.ShouldDebug(facility) that is fast enough to be used like the old "if
debug".
The point of all this is that we can now toggle debugging for the
various packages on and off at runtime. There's a new method
/rest/system/debug that can be POSTed a set of facilities to enable and
disable debug for, or GET from to get a list of facilities with
descriptions and their current debug status.
Similarly a /rest/system/log?since=... can grab the latest log entries,
up to 250 of them (hardcoded constant in main.go) plus the initial few.
Not implemented in this commit (but planned) is a simple debug GUI
available on /debug that shows the current log in an easily pasteable
format and has checkboxes to enable the various debug facilities.
The debug instructions to a user then becomes "visit this URL, check
these boxes, reproduce your problem, copy and paste the log". The actual
log viewer on the hypothetical /debug URL can poll regularly for new log
entries and this bypass the 250 line limit.
The existing STTRACE=foo variable is still obeyed and just sets the
start state of the system.
78 lines
1.9 KiB
Go
78 lines
1.9 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at http://mozilla.org/MPL/2.0/.
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package scanner
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import (
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"os"
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"path/filepath"
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"github.com/syncthing/syncthing/lib/protocol"
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"github.com/syncthing/syncthing/lib/sync"
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)
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// The parallell hasher reads FileInfo structures from the inbox, hashes the
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// file to populate the Blocks element and sends it to the outbox. A number of
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// workers are used in parallel. The outbox will become closed when the inbox
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// is closed and all items handled.
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func newParallelHasher(dir string, blockSize, workers int, outbox, inbox chan protocol.FileInfo, counter *int64, done chan struct{}) {
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wg := sync.NewWaitGroup()
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wg.Add(workers)
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for i := 0; i < workers; i++ {
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go func() {
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hashFiles(dir, blockSize, outbox, inbox, counter)
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wg.Done()
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}()
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}
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go func() {
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wg.Wait()
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if done != nil {
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close(done)
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}
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close(outbox)
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}()
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}
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func HashFile(path string, blockSize int, sizeHint int64, counter *int64) ([]protocol.BlockInfo, error) {
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fd, err := os.Open(path)
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if err != nil {
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l.Debugln("open:", err)
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return []protocol.BlockInfo{}, err
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}
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defer fd.Close()
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if sizeHint == 0 {
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fi, err := fd.Stat()
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if err != nil {
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l.Debugln("stat:", err)
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return []protocol.BlockInfo{}, err
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}
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sizeHint = fi.Size()
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}
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return Blocks(fd, blockSize, sizeHint, counter)
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}
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func hashFiles(dir string, blockSize int, outbox, inbox chan protocol.FileInfo, counter *int64) {
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for f := range inbox {
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if f.IsDirectory() || f.IsDeleted() {
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panic("Bug. Asked to hash a directory or a deleted file.")
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}
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blocks, err := HashFile(filepath.Join(dir, f.Name), blockSize, f.CachedSize, counter)
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if err != nil {
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l.Debugln("hash error:", f.Name, err)
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continue
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}
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f.Blocks = blocks
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outbox <- f
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}
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}
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