diff options
Diffstat (limited to 'vendor/github.com/hpcloud/tail/watch')
-rw-r--r-- | vendor/github.com/hpcloud/tail/watch/filechanges.go | 36 | ||||
-rw-r--r-- | vendor/github.com/hpcloud/tail/watch/inotify.go | 128 | ||||
-rw-r--r-- | vendor/github.com/hpcloud/tail/watch/inotify_tracker.go | 260 | ||||
-rw-r--r-- | vendor/github.com/hpcloud/tail/watch/polling.go | 118 | ||||
-rw-r--r-- | vendor/github.com/hpcloud/tail/watch/watch.go | 20 |
5 files changed, 0 insertions, 562 deletions
diff --git a/vendor/github.com/hpcloud/tail/watch/filechanges.go b/vendor/github.com/hpcloud/tail/watch/filechanges.go deleted file mode 100644 index 3ce5dcecb..000000000 --- a/vendor/github.com/hpcloud/tail/watch/filechanges.go +++ /dev/null @@ -1,36 +0,0 @@ -package watch - -type FileChanges struct { - Modified chan bool // Channel to get notified of modifications - Truncated chan bool // Channel to get notified of truncations - Deleted chan bool // Channel to get notified of deletions/renames -} - -func NewFileChanges() *FileChanges { - return &FileChanges{ - make(chan bool), make(chan bool), make(chan bool)} -} - -func (fc *FileChanges) NotifyModified() { - sendOnlyIfEmpty(fc.Modified) -} - -func (fc *FileChanges) NotifyTruncated() { - sendOnlyIfEmpty(fc.Truncated) -} - -func (fc *FileChanges) NotifyDeleted() { - sendOnlyIfEmpty(fc.Deleted) -} - -// sendOnlyIfEmpty sends on a bool channel only if the channel has no -// backlog to be read by other goroutines. This concurrency pattern -// can be used to notify other goroutines if and only if they are -// looking for it (i.e., subsequent notifications can be compressed -// into one). -func sendOnlyIfEmpty(ch chan bool) { - select { - case ch <- true: - default: - } -} diff --git a/vendor/github.com/hpcloud/tail/watch/inotify.go b/vendor/github.com/hpcloud/tail/watch/inotify.go deleted file mode 100644 index 4478f1e1a..000000000 --- a/vendor/github.com/hpcloud/tail/watch/inotify.go +++ /dev/null @@ -1,128 +0,0 @@ -// Copyright (c) 2015 HPE Software Inc. All rights reserved. -// Copyright (c) 2013 ActiveState Software Inc. All rights reserved. - -package watch - -import ( - "fmt" - "os" - "path/filepath" - - "github.com/hpcloud/tail/util" - - "gopkg.in/fsnotify.v1" - "gopkg.in/tomb.v1" -) - -// InotifyFileWatcher uses inotify to monitor file changes. -type InotifyFileWatcher struct { - Filename string - Size int64 -} - -func NewInotifyFileWatcher(filename string) *InotifyFileWatcher { - fw := &InotifyFileWatcher{filepath.Clean(filename), 0} - return fw -} - -func (fw *InotifyFileWatcher) BlockUntilExists(t *tomb.Tomb) error { - err := WatchCreate(fw.Filename) - if err != nil { - return err - } - defer RemoveWatchCreate(fw.Filename) - - // Do a real check now as the file might have been created before - // calling `WatchFlags` above. - if _, err = os.Stat(fw.Filename); !os.IsNotExist(err) { - // file exists, or stat returned an error. - return err - } - - events := Events(fw.Filename) - - for { - select { - case evt, ok := <-events: - if !ok { - return fmt.Errorf("inotify watcher has been closed") - } - evtName, err := filepath.Abs(evt.Name) - if err != nil { - return err - } - fwFilename, err := filepath.Abs(fw.Filename) - if err != nil { - return err - } - if evtName == fwFilename { - return nil - } - case <-t.Dying(): - return tomb.ErrDying - } - } - panic("unreachable") -} - -func (fw *InotifyFileWatcher) ChangeEvents(t *tomb.Tomb, pos int64) (*FileChanges, error) { - err := Watch(fw.Filename) - if err != nil { - return nil, err - } - - changes := NewFileChanges() - fw.Size = pos - - go func() { - defer RemoveWatch(fw.Filename) - - events := Events(fw.Filename) - - for { - prevSize := fw.Size - - var evt fsnotify.Event - var ok bool - - select { - case evt, ok = <-events: - if !ok { - return - } - case <-t.Dying(): - return - } - - switch { - case evt.Op&fsnotify.Remove == fsnotify.Remove: - fallthrough - - case evt.Op&fsnotify.Rename == fsnotify.Rename: - changes.NotifyDeleted() - return - - case evt.Op&fsnotify.Write == fsnotify.Write: - fi, err := os.Stat(fw.Filename) - if err != nil { - if os.IsNotExist(err) { - changes.NotifyDeleted() - return - } - // XXX: report this error back to the user - util.Fatal("Failed to stat file %v: %v", fw.Filename, err) - } - fw.Size = fi.Size() - - if prevSize > 0 && prevSize > fw.Size { - changes.NotifyTruncated() - } else { - changes.NotifyModified() - } - prevSize = fw.Size - } - } - }() - - return changes, nil -} diff --git a/vendor/github.com/hpcloud/tail/watch/inotify_tracker.go b/vendor/github.com/hpcloud/tail/watch/inotify_tracker.go deleted file mode 100644 index 03be4275c..000000000 --- a/vendor/github.com/hpcloud/tail/watch/inotify_tracker.go +++ /dev/null @@ -1,260 +0,0 @@ -// Copyright (c) 2015 HPE Software Inc. All rights reserved. -// Copyright (c) 2013 ActiveState Software Inc. All rights reserved. - -package watch - -import ( - "log" - "os" - "path/filepath" - "sync" - "syscall" - - "github.com/hpcloud/tail/util" - - "gopkg.in/fsnotify.v1" -) - -type InotifyTracker struct { - mux sync.Mutex - watcher *fsnotify.Watcher - chans map[string]chan fsnotify.Event - done map[string]chan bool - watchNums map[string]int - watch chan *watchInfo - remove chan *watchInfo - error chan error -} - -type watchInfo struct { - op fsnotify.Op - fname string -} - -func (this *watchInfo) isCreate() bool { - return this.op == fsnotify.Create -} - -var ( - // globally shared InotifyTracker; ensures only one fsnotify.Watcher is used - shared *InotifyTracker - - // these are used to ensure the shared InotifyTracker is run exactly once - once = sync.Once{} - goRun = func() { - shared = &InotifyTracker{ - mux: sync.Mutex{}, - chans: make(map[string]chan fsnotify.Event), - done: make(map[string]chan bool), - watchNums: make(map[string]int), - watch: make(chan *watchInfo), - remove: make(chan *watchInfo), - error: make(chan error), - } - go shared.run() - } - - logger = log.New(os.Stderr, "", log.LstdFlags) -) - -// Watch signals the run goroutine to begin watching the input filename -func Watch(fname string) error { - return watch(&watchInfo{ - fname: fname, - }) -} - -// Watch create signals the run goroutine to begin watching the input filename -// if call the WatchCreate function, don't call the Cleanup, call the RemoveWatchCreate -func WatchCreate(fname string) error { - return watch(&watchInfo{ - op: fsnotify.Create, - fname: fname, - }) -} - -func watch(winfo *watchInfo) error { - // start running the shared InotifyTracker if not already running - once.Do(goRun) - - winfo.fname = filepath.Clean(winfo.fname) - shared.watch <- winfo - return <-shared.error -} - -// RemoveWatch signals the run goroutine to remove the watch for the input filename -func RemoveWatch(fname string) { - remove(&watchInfo{ - fname: fname, - }) -} - -// RemoveWatch create signals the run goroutine to remove the watch for the input filename -func RemoveWatchCreate(fname string) { - remove(&watchInfo{ - op: fsnotify.Create, - fname: fname, - }) -} - -func remove(winfo *watchInfo) { - // start running the shared InotifyTracker if not already running - once.Do(goRun) - - winfo.fname = filepath.Clean(winfo.fname) - shared.mux.Lock() - done := shared.done[winfo.fname] - if done != nil { - delete(shared.done, winfo.fname) - close(done) - } - - fname := winfo.fname - if winfo.isCreate() { - // Watch for new files to be created in the parent directory. - fname = filepath.Dir(fname) - } - shared.watchNums[fname]-- - watchNum := shared.watchNums[fname] - if watchNum == 0 { - delete(shared.watchNums, fname) - } - shared.mux.Unlock() - - // If we were the last ones to watch this file, unsubscribe from inotify. - // This needs to happen after releasing the lock because fsnotify waits - // synchronously for the kernel to acknowledge the removal of the watch - // for this file, which causes us to deadlock if we still held the lock. - if watchNum == 0 { - shared.watcher.Remove(fname) - } - shared.remove <- winfo -} - -// Events returns a channel to which FileEvents corresponding to the input filename -// will be sent. This channel will be closed when removeWatch is called on this -// filename. -func Events(fname string) <-chan fsnotify.Event { - shared.mux.Lock() - defer shared.mux.Unlock() - - return shared.chans[fname] -} - -// Cleanup removes the watch for the input filename if necessary. -func Cleanup(fname string) { - RemoveWatch(fname) -} - -// watchFlags calls fsnotify.WatchFlags for the input filename and flags, creating -// a new Watcher if the previous Watcher was closed. -func (shared *InotifyTracker) addWatch(winfo *watchInfo) error { - shared.mux.Lock() - defer shared.mux.Unlock() - - if shared.chans[winfo.fname] == nil { - shared.chans[winfo.fname] = make(chan fsnotify.Event) - shared.done[winfo.fname] = make(chan bool) - } - - fname := winfo.fname - if winfo.isCreate() { - // Watch for new files to be created in the parent directory. - fname = filepath.Dir(fname) - } - - // already in inotify watch - if shared.watchNums[fname] > 0 { - shared.watchNums[fname]++ - if winfo.isCreate() { - shared.watchNums[winfo.fname]++ - } - return nil - } - - err := shared.watcher.Add(fname) - if err == nil { - shared.watchNums[fname]++ - if winfo.isCreate() { - shared.watchNums[winfo.fname]++ - } - } - return err -} - -// removeWatch calls fsnotify.RemoveWatch for the input filename and closes the -// corresponding events channel. -func (shared *InotifyTracker) removeWatch(winfo *watchInfo) { - shared.mux.Lock() - defer shared.mux.Unlock() - - ch := shared.chans[winfo.fname] - if ch == nil { - return - } - - delete(shared.chans, winfo.fname) - close(ch) - - if !winfo.isCreate() { - return - } - - shared.watchNums[winfo.fname]-- - if shared.watchNums[winfo.fname] == 0 { - delete(shared.watchNums, winfo.fname) - } -} - -// sendEvent sends the input event to the appropriate Tail. -func (shared *InotifyTracker) sendEvent(event fsnotify.Event) { - name := filepath.Clean(event.Name) - - shared.mux.Lock() - ch := shared.chans[name] - done := shared.done[name] - shared.mux.Unlock() - - if ch != nil && done != nil { - select { - case ch <- event: - case <-done: - } - } -} - -// run starts the goroutine in which the shared struct reads events from its -// Watcher's Event channel and sends the events to the appropriate Tail. -func (shared *InotifyTracker) run() { - watcher, err := fsnotify.NewWatcher() - if err != nil { - util.Fatal("failed to create Watcher") - } - shared.watcher = watcher - - for { - select { - case winfo := <-shared.watch: - shared.error <- shared.addWatch(winfo) - - case winfo := <-shared.remove: - shared.removeWatch(winfo) - - case event, open := <-shared.watcher.Events: - if !open { - return - } - shared.sendEvent(event) - - case err, open := <-shared.watcher.Errors: - if !open { - return - } else if err != nil { - sysErr, ok := err.(*os.SyscallError) - if !ok || sysErr.Err != syscall.EINTR { - logger.Printf("Error in Watcher Error channel: %s", err) - } - } - } - } -} diff --git a/vendor/github.com/hpcloud/tail/watch/polling.go b/vendor/github.com/hpcloud/tail/watch/polling.go deleted file mode 100644 index 49491f21d..000000000 --- a/vendor/github.com/hpcloud/tail/watch/polling.go +++ /dev/null @@ -1,118 +0,0 @@ -// Copyright (c) 2015 HPE Software Inc. All rights reserved. -// Copyright (c) 2013 ActiveState Software Inc. All rights reserved. - -package watch - -import ( - "os" - "runtime" - "time" - - "github.com/hpcloud/tail/util" - "gopkg.in/tomb.v1" -) - -// PollingFileWatcher polls the file for changes. -type PollingFileWatcher struct { - Filename string - Size int64 -} - -func NewPollingFileWatcher(filename string) *PollingFileWatcher { - fw := &PollingFileWatcher{filename, 0} - return fw -} - -var POLL_DURATION time.Duration - -func (fw *PollingFileWatcher) BlockUntilExists(t *tomb.Tomb) error { - for { - if _, err := os.Stat(fw.Filename); err == nil { - return nil - } else if !os.IsNotExist(err) { - return err - } - select { - case <-time.After(POLL_DURATION): - continue - case <-t.Dying(): - return tomb.ErrDying - } - } - panic("unreachable") -} - -func (fw *PollingFileWatcher) ChangeEvents(t *tomb.Tomb, pos int64) (*FileChanges, error) { - origFi, err := os.Stat(fw.Filename) - if err != nil { - return nil, err - } - - changes := NewFileChanges() - var prevModTime time.Time - - // XXX: use tomb.Tomb to cleanly manage these goroutines. replace - // the fatal (below) with tomb's Kill. - - fw.Size = pos - - go func() { - prevSize := fw.Size - for { - select { - case <-t.Dying(): - return - default: - } - - time.Sleep(POLL_DURATION) - fi, err := os.Stat(fw.Filename) - if err != nil { - // Windows cannot delete a file if a handle is still open (tail keeps one open) - // so it gives access denied to anything trying to read it until all handles are released. - if os.IsNotExist(err) || (runtime.GOOS == "windows" && os.IsPermission(err)) { - // File does not exist (has been deleted). - changes.NotifyDeleted() - return - } - - // XXX: report this error back to the user - util.Fatal("Failed to stat file %v: %v", fw.Filename, err) - } - - // File got moved/renamed? - if !os.SameFile(origFi, fi) { - changes.NotifyDeleted() - return - } - - // File got truncated? - fw.Size = fi.Size() - if prevSize > 0 && prevSize > fw.Size { - changes.NotifyTruncated() - prevSize = fw.Size - continue - } - // File got bigger? - if prevSize > 0 && prevSize < fw.Size { - changes.NotifyModified() - prevSize = fw.Size - continue - } - prevSize = fw.Size - - // File was appended to (changed)? - modTime := fi.ModTime() - if modTime != prevModTime { - prevModTime = modTime - changes.NotifyModified() - } - } - }() - - return changes, nil -} - -func init() { - POLL_DURATION = 250 * time.Millisecond -} diff --git a/vendor/github.com/hpcloud/tail/watch/watch.go b/vendor/github.com/hpcloud/tail/watch/watch.go deleted file mode 100644 index 2e1783ef0..000000000 --- a/vendor/github.com/hpcloud/tail/watch/watch.go +++ /dev/null @@ -1,20 +0,0 @@ -// Copyright (c) 2015 HPE Software Inc. All rights reserved. -// Copyright (c) 2013 ActiveState Software Inc. All rights reserved. - -package watch - -import "gopkg.in/tomb.v1" - -// FileWatcher monitors file-level events. -type FileWatcher interface { - // BlockUntilExists blocks until the file comes into existence. - BlockUntilExists(*tomb.Tomb) error - - // ChangeEvents reports on changes to a file, be it modification, - // deletion, renames or truncations. Returned FileChanges group of - // channels will be closed, thus become unusable, after a deletion - // or truncation event. - // In order to properly report truncations, ChangeEvents requires - // the caller to pass their current offset in the file. - ChangeEvents(*tomb.Tomb, int64) (*FileChanges, error) -} |