-: fix autohosts tests on Windows

util/auto_hosts.go

@@ -23,7 +23,7 @@ type AutoHosts struct {
 	hostsFn    string              // path to the main hosts-file
 	hostsDirs  []string            // paths to OS-specific directories with hosts-files
 	watcher    *fsnotify.Watcher   // file and directory watcher object
-	updateChan chan bool           // signal for 'update' goroutine
+	updateChan chan bool           // signal for 'updateLoop' goroutine
 
 	onChanged onChangedT // notification to other modules
 }
@@ -68,20 +68,22 @@ func (a *AutoHosts) Init(hostsFn string) {
 
 // Start - start module
 func (a *AutoHosts) Start() {
-	go a.update()
+	log.Debug("Start AutoHosts module")
+
+	go a.updateLoop()
 	a.updateChan <- true
 
 	go a.watcherLoop()
 
 	err := a.watcher.Add(a.hostsFn)
 	if err != nil {
-		log.Error("AutoHosts: %s", err)
+		log.Error("Error while initializing watcher for a file %s: %s", a.hostsFn, err)
 	}
 
 	for _, dir := range a.hostsDirs {
 		err = a.watcher.Add(dir)
 		if err != nil {
-			log.Error("AutoHosts: %s", err)
+			log.Error("Error while initializing watcher for a directory %s: %s", dir, err)
 		}
 	}
 }
@@ -89,7 +91,8 @@ func (a *AutoHosts) Start() {
 // Close - close module
 func (a *AutoHosts) Close() {
 	a.updateChan <- false
-	a.watcher.Close()
+	close(a.updateChan)
+	_ = a.watcher.Close()
 }
 
 // Read IP-hostname pairs from file
@@ -174,7 +177,7 @@ func (a *AutoHosts) watcherLoop() {
 				log.Debug("AutoHosts: modified: %s", event.Name)
 				select {
 				case a.updateChan <- true:
-					// sent a signal to 'update' goroutine
+					// sent a signal to 'updateLoop' goroutine
 				default:
 					// queue is full
 				}
@@ -189,15 +192,23 @@ func (a *AutoHosts) watcherLoop() {
 	}
 }
 
-// Read static hosts from system files
-func (a *AutoHosts) update() {
+// updateLoop - read static hosts from system files
+func (a *AutoHosts) updateLoop() {
 	for {
 		select {
 		case ok := <-a.updateChan:
 			if !ok {
+				log.Debug("Finished AutoHosts update loop")
 				return
 			}
 
+			a.updateHosts()
+		}
+	}
+}
+
+// updateHosts - loads system hosts
+func (a *AutoHosts) updateHosts() {
 	table := make(map[string][]net.IP)
 
 	a.load(table, a.hostsFn)
@@ -219,9 +230,8 @@ func (a *AutoHosts) update() {
 	a.lock.Lock()
 	a.table = table
 	a.lock.Unlock()
+
 	a.notify()
-		}
-	}
 }
 
 // Process - get the list of IP addresses for the hostname

util/auto_hosts_test.go

@@ -17,38 +17,73 @@ func prepareTestDir() string {
 	return dir
 }
 
-func TestAutoHosts(t *testing.T) {
+func TestAutoHostsResolution(t *testing.T) {
 	ah := AutoHosts{}
 
 	dir := prepareTestDir()
 	defer func() { _ = os.RemoveAll(dir) }()
 
 	f, _ := ioutil.TempFile(dir, "")
-	defer os.Remove(f.Name())
+	defer func() { _ = os.Remove(f.Name()) }()
 	defer f.Close()
 
 	_, _ = f.WriteString("  127.0.0.1   host  localhost  \n")
-
 	ah.Init(f.Name())
-	ah.Start()
-	// wait until we parse the file
-	time.Sleep(50 * time.Millisecond)
 
+	// Update from the hosts file
+	ah.updateHosts()
+
+	// Existing host
 	ips := ah.Process("localhost")
-	assert.True(t, ips[0].Equal(net.ParseIP("127.0.0.1")))
-	ips = ah.Process("newhost")
-	assert.True(t, ips == nil)
+	assert.NotNil(t, ips)
+	assert.Equal(t, 1, len(ips))
+	assert.Equal(t, net.ParseIP("127.0.0.1"), ips[0])
 
+	// Unknown host
+	ips = ah.Process("newhost")
+	assert.Nil(t, ips)
+
+	// Test hosts file
 	table := ah.List()
 	ips, _ = table["host"]
-	assert.True(t, ips[0].String() == "127.0.0.1")
+	assert.NotNil(t, ips)
+	assert.Equal(t, 1, len(ips))
+	assert.Equal(t, "127.0.0.1", ips[0].String())
+}
 
+func TestAutoHostsFSNotify(t *testing.T) {
+	ah := AutoHosts{}
+
+	dir := prepareTestDir()
+	defer func() { _ = os.RemoveAll(dir) }()
+
+	f, _ := ioutil.TempFile(dir, "")
+	defer func() { _ = os.Remove(f.Name()) }()
+	defer f.Close()
+
+	// Init
+	_, _ = f.WriteString("  127.0.0.1   host  localhost  \n")
+	ah.Init(f.Name())
+	ah.updateHosts()
+
+	// Unknown host
+	ips := ah.Process("newhost")
+	assert.Nil(t, ips)
+
+	// Stat monitoring for changes
+	ah.Start()
+	defer ah.Close()
+
+	// Update file
 	_, _ = f.WriteString("127.0.0.2   newhost\n")
+	_ = f.Sync()
+
 	// wait until fsnotify has triggerred and processed the file-modification event
 	time.Sleep(50 * time.Millisecond)
 
+	// Check if we are notified about changes
 	ips = ah.Process("newhost")
-	assert.True(t, ips[0].Equal(net.ParseIP("127.0.0.2")))
-
-	ah.Close()
+	assert.NotNil(t, ips)
+	assert.Equal(t, 1, len(ips))
+	assert.Equal(t, "127.0.0.2", ips[0].String())
 }