Restructured to have subpackages, added server communication

client/watcher.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"asink"
+	"github.com/howeyc/fsnotify"
+	"os"
+	"path/filepath"
+	"time"
+)
+
+func StartWatching(watchDir string, fileUpdates chan *asink.Event) {
+	watcher, err := fsnotify.NewWatcher()
+	if err != nil {
+		panic("Failed to create fsnotify watcher")
+	}
+
+	//function called by filepath.Walk to start watching a directory and all subdirectories
+	watchDirFn := func(path string, info os.FileInfo, err error) error {
+		if info.IsDir() {
+			err = watcher.Watch(path)
+			if err != nil {
+				panic("Failed to watch " + path)
+			}
+		}
+		return nil
+	}
+
+	//processes all the fsnotify events into asink events
+	go func() {
+		for {
+			select {
+			case ev := <-watcher.Event:
+				//if a directory was created, begin recursively watching all its subdirectories
+				if fi, err := os.Stat(ev.Name); err == nil && fi.IsDir() {
+					if ev.IsCreate() {
+						filepath.Walk(ev.Name, watchDirFn)
+					}
+					continue
+				}
+
+				event := new(asink.Event)
+				if ev.IsCreate() || ev.IsModify() {
+					event.Type = asink.UPDATE
+				} else if ev.IsDelete() || ev.IsRename() {
+					event.Type = asink.DELETE
+				} else {
+					panic("Unknown fsnotify event type")
+				}
+
+				event.Status = asink.NOTICED
+				event.Path = ev.Name
+				event.Timestamp = time.Now().UnixNano()
+
+				fileUpdates <- event
+
+			case err := <-watcher.Error:
+				panic(err)
+			}
+		}
+	}()
+
+	//start watching the directory passed in
+	filepath.Walk(watchDir, watchDirFn)
+}