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Implement facility based logger, debugging via REST API

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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.
This commit is contained in:
Jakob Borg
2015-10-03 17:25:21 +02:00
parent 2de364414f
commit 76af9ba53d
62 changed files with 796 additions and 1383 deletions
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62
lib/scanner/walk.go
View File

@@ -94,9 +94,7 @@ type IgnoreMatcher interface {
// Walk returns the list of files found in the local folder by scanning the
// file system. Files are blockwise hashed.
func (w *Walker) Walk() (chan protocol.FileInfo, error) {
if debug {
l.Debugln("Walk", w.Dir, w.Subs, w.BlockSize, w.Matcher)
}
l.Debugln("Walk", w.Dir, w.Subs, w.BlockSize, w.Matcher)
err := checkDir(w.Dir)
if err != nil {
@@ -159,16 +157,12 @@ func (w *Walker) Walk() (chan protocol.FileInfo, error) {
for {
select {
case <-done:
if debug {
l.Debugln("Walk progress done", w.Dir, w.Subs, w.BlockSize, w.Matcher)
}
l.Debugln("Walk progress done", w.Dir, w.Subs, w.BlockSize, w.Matcher)
ticker.Stop()
return
case <-ticker.C:
current := atomic.LoadInt64(&progress)
if debug {
l.Debugf("Walk %s %s current progress %d/%d (%d%%)", w.Dir, w.Subs, current, total, current*100/total)
}
l.Debugf("Walk %s %s current progress %d/%d (%d%%)", w.Dir, w.Subs, current, total, current*100/total)
events.Default.Log(events.FolderScanProgress, map[string]interface{}{
"folder": w.Folder,
"current": current,
@@ -179,9 +173,7 @@ func (w *Walker) Walk() (chan protocol.FileInfo, error) {
}()
for _, file := range filesToHash {
if debug {
l.Debugln("real to hash:", file.Name)
}
l.Debugln("real to hash:", file.Name)
realToHashChan <- file
}
close(realToHashChan)
@@ -202,17 +194,13 @@ func (w *Walker) walkAndHashFiles(fchan, dchan chan protocol.FileInfo) filepath.
}
if err != nil {
if debug {
l.Debugln("error:", p, info, err)
}
l.Debugln("error:", p, info, err)
return skip
}
rn, err := filepath.Rel(w.Dir, p)
if err != nil {
if debug {
l.Debugln("rel error:", p, err)
}
l.Debugln("rel error:", p, err)
return skip
}
@@ -227,14 +215,10 @@ func (w *Walker) walkAndHashFiles(fchan, dchan chan protocol.FileInfo) filepath.
if w.TempNamer != nil && w.TempNamer.IsTemporary(rn) {
// A temporary file
if debug {
l.Debugln("temporary:", rn)
}
l.Debugln("temporary:", rn)
if info.Mode().IsRegular() && mtime.Add(w.TempLifetime).Before(now) {
os.Remove(p)
if debug {
l.Debugln("removing temporary:", rn, mtime)
}
l.Debugln("removing temporary:", rn, mtime)
}
return nil
}
@@ -242,9 +226,7 @@ func (w *Walker) walkAndHashFiles(fchan, dchan chan protocol.FileInfo) filepath.
if sn := filepath.Base(rn); sn == ".stignore" || sn == ".stfolder" ||
strings.HasPrefix(rn, ".stversions") || (w.Matcher != nil && w.Matcher.Match(rn)) {
// An ignored file
if debug {
l.Debugln("ignored:", rn)
}
l.Debugln("ignored:", rn)
return skip
}
@@ -313,17 +295,13 @@ func (w *Walker) walkAndHashFiles(fchan, dchan chan protocol.FileInfo) filepath.
target, targetType, err := symlinks.Read(p)
if err != nil {
if debug {
l.Debugln("readlink error:", p, err)
}
l.Debugln("readlink error:", p, err)
return skip
}
blocks, err := Blocks(strings.NewReader(target), w.BlockSize, 0, nil)
if err != nil {
if debug {
l.Debugln("hash link error:", p, err)
}
l.Debugln("hash link error:", p, err)
return skip
}
@@ -349,9 +327,7 @@ func (w *Walker) walkAndHashFiles(fchan, dchan chan protocol.FileInfo) filepath.
Blocks: blocks,
}
if debug {
l.Debugln("symlink changedb:", p, f)
}
l.Debugln("symlink changedb:", p, f)
dchan <- f
@@ -386,9 +362,7 @@ func (w *Walker) walkAndHashFiles(fchan, dchan chan protocol.FileInfo) filepath.
Flags: flags,
Modified: mtime.Unix(),
}
if debug {
l.Debugln("dir:", p, f)
}
l.Debugln("dir:", p, f)
dchan <- f
return nil
}
@@ -416,9 +390,7 @@ func (w *Walker) walkAndHashFiles(fchan, dchan chan protocol.FileInfo) filepath.
return nil
}
if debug {
l.Debugln("rescan:", cf, mtime.Unix(), info.Mode()&os.ModePerm)
}
l.Debugln("rescan:", cf, mtime.Unix(), info.Mode()&os.ModePerm)
}
var flags = curMode & uint32(maskModePerm)
@@ -433,9 +405,7 @@ func (w *Walker) walkAndHashFiles(fchan, dchan chan protocol.FileInfo) filepath.
Modified: mtime.Unix(),
CachedSize: info.Size(),
}
if debug {
l.Debugln("to hash:", p, f)
}
l.Debugln("to hash:", p, f)
fchan <- f
}
@@ -448,7 +418,7 @@ func checkDir(dir string) error {
return err
} else if !info.IsDir() {
return errors.New(dir + ": not a directory")
} else if debug {
} else {
l.Debugln("checkDir", dir, info)
}
return nil