restructure inotify package and add some tests

internal/inotify/setup.go

@@ -0,0 +1,69 @@
+package inotify
+
+import (
+	"fmt"
+
+	"github.com/dominicbreuker/pspy/internal/inotify/walker"
+)
+
+type InotifyWatcher struct {
+	i *Inotify
+}
+
+func (iw *InotifyWatcher) Close() {
+	iw.i.Close()
+}
+
+func NewInotifyWatcher() (*InotifyWatcher, error) {
+	i, err := NewInotify()
+	if err != nil {
+		return nil, fmt.Errorf("setting up inotify: %v", err)
+	}
+	return &InotifyWatcher{
+		i: i,
+	}, nil
+}
+
+func (iw *InotifyWatcher) Setup(rdirs, dirs []string, errCh chan error) (chan struct{}, chan string, error) {
+	maxWatchers, err := getLimit()
+	if err != nil {
+		errCh <- fmt.Errorf("Can't get inotify watcher limit...: %v\n", err)
+		maxWatchers = -1
+	}
+
+	for _, dir := range rdirs {
+		addWatchers(dir, -1, iw.i, maxWatchers, errCh)
+	}
+	for _, dir := range dirs {
+		addWatchers(dir, 0, iw.i, maxWatchers, errCh)
+	}
+
+	triggerCh := make(chan struct{})
+	dataCh := make(chan []byte)
+	go Observe(iw.i, triggerCh, dataCh, errCh)
+
+	eventCh := make(chan string)
+	go parseEvents(iw.i, dataCh, eventCh, errCh)
+
+	return triggerCh, eventCh, nil
+}
+
+func addWatchers(dir string, depth int, i *Inotify, maxWatchers int, errCh chan error) {
+	dirCh, doneCh := walker.Walk(dir, depth, errCh)
+loop:
+	for {
+		if maxWatchers > 0 && i.NumWatchers() >= maxWatchers {
+			close(doneCh)
+			break loop
+		}
+		select {
+		case dir, ok := <-dirCh:
+			if !ok {
+				break loop
+			}
+			if err := i.Watch(dir); err != nil {
+				errCh <- fmt.Errorf("Can't create watcher: %v", err)
+			}
+		}
+	}
+}