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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build linux
package fsnotify
import (
"fmt"
"os"
"path/filepath"
"strings"
"sync"
"testing"
"time"
)
func TestInotifyCloseRightAway(t *testing.T) {
w, err := NewWatcher()
if err != nil {
t.Fatalf("Failed to create watcher")
}
// Close immediately; it won't even reach the first unix.Read.
w.Close()
// Wait for the close to complete.
<-time.After(50 * time.Millisecond)
isWatcherReallyClosed(t, w)
}
func TestInotifyCloseSlightlyLater(t *testing.T) {
w, err := NewWatcher()
if err != nil {
t.Fatalf("Failed to create watcher")
}
// Wait until readEvents has reached unix.Read, and Close.
<-time.After(50 * time.Millisecond)
w.Close()
// Wait for the close to complete.
<-time.After(50 * time.Millisecond)
isWatcherReallyClosed(t, w)
}
func TestInotifyCloseSlightlyLaterWithWatch(t *testing.T) {
testDir := tempMkdir(t)
defer os.RemoveAll(testDir)
w, err := NewWatcher()
if err != nil {
t.Fatalf("Failed to create watcher")
}
w.Add(testDir)
// Wait until readEvents has reached unix.Read, and Close.
<-time.After(50 * time.Millisecond)
w.Close()
// Wait for the close to complete.
<-time.After(50 * time.Millisecond)
isWatcherReallyClosed(t, w)
}
func TestInotifyCloseAfterRead(t *testing.T) {
testDir := tempMkdir(t)
defer os.RemoveAll(testDir)
w, err := NewWatcher()
if err != nil {
t.Fatalf("Failed to create watcher")
}
err = w.Add(testDir)
if err != nil {
t.Fatalf("Failed to add .")
}
// Generate an event.
os.Create(filepath.Join(testDir, "somethingSOMETHINGsomethingSOMETHING"))
// Wait for readEvents to read the event, then close the watcher.
<-time.After(50 * time.Millisecond)
w.Close()
// Wait for the close to complete.
<-time.After(50 * time.Millisecond)
isWatcherReallyClosed(t, w)
}
func isWatcherReallyClosed(t *testing.T, w *Watcher) {
select {
case err, ok := <-w.Errors:
if ok {
t.Fatalf("w.Errors is not closed; readEvents is still alive after closing (error: %v)", err)
}
default:
t.Fatalf("w.Errors would have blocked; readEvents is still alive!")
}
select {
case _, ok := <-w.Events:
if ok {
t.Fatalf("w.Events is not closed; readEvents is still alive after closing")
}
default:
t.Fatalf("w.Events would have blocked; readEvents is still alive!")
}
}
func TestInotifyCloseCreate(t *testing.T) {
testDir := tempMkdir(t)
defer os.RemoveAll(testDir)
w, err := NewWatcher()
if err != nil {
t.Fatalf("Failed to create watcher: %v", err)
}
defer w.Close()
err = w.Add(testDir)
if err != nil {
t.Fatalf("Failed to add testDir: %v", err)
}
h, err := os.Create(filepath.Join(testDir, "testfile"))
if err != nil {
t.Fatalf("Failed to create file in testdir: %v", err)
}
h.Close()
select {
case _ = <-w.Events:
case err := <-w.Errors:
t.Fatalf("Error from watcher: %v", err)
case <-time.After(50 * time.Millisecond):
t.Fatalf("Took too long to wait for event")
}
// At this point, we've received one event, so the goroutine is ready.
// It's also blocking on unix.Read.
// Now we try to swap the file descriptor under its nose.
w.Close()
w, err = NewWatcher()
defer w.Close()
if err != nil {
t.Fatalf("Failed to create second watcher: %v", err)
}
<-time.After(50 * time.Millisecond)
err = w.Add(testDir)
if err != nil {
t.Fatalf("Error adding testDir again: %v", err)
}
}
// This test verifies the watcher can keep up with file creations/deletions
// when under load.
func TestInotifyStress(t *testing.T) {
maxNumToCreate := 1000
testDir := tempMkdir(t)
defer os.RemoveAll(testDir)
testFilePrefix := filepath.Join(testDir, "testfile")
w, err := NewWatcher()
if err != nil {
t.Fatalf("Failed to create watcher: %v", err)
}
defer w.Close()
err = w.Add(testDir)
if err != nil {
t.Fatalf("Failed to add testDir: %v", err)
}
doneChan := make(chan struct{})
// The buffer ensures that the file generation goroutine is never blocked.
errChan := make(chan error, 2*maxNumToCreate)
go func() {
for i := 0; i < maxNumToCreate; i++ {
testFile := fmt.Sprintf("%s%d", testFilePrefix, i)
handle, err := os.Create(testFile)
if err != nil {
errChan <- fmt.Errorf("Create failed: %v", err)
continue
}
err = handle.Close()
if err != nil {
errChan <- fmt.Errorf("Close failed: %v", err)
continue
}
}
// If we delete a newly created file too quickly, inotify will skip the
// create event and only send the delete event.
time.Sleep(100 * time.Millisecond)
for i := 0; i < maxNumToCreate; i++ {
testFile := fmt.Sprintf("%s%d", testFilePrefix, i)
err = os.Remove(testFile)
if err != nil {
errChan <- fmt.Errorf("Remove failed: %v", err)
}
}
close(doneChan)
}()
creates := 0
removes := 0
finished := false
after := time.After(10 * time.Second)
for !finished {
select {
case <-after:
t.Fatalf("Not done")
case <-doneChan:
finished = true
case err := <-errChan:
t.Fatalf("Got an error from file creator goroutine: %v", err)
case err := <-w.Errors:
t.Fatalf("Got an error from watcher: %v", err)
case evt := <-w.Events:
if !strings.HasPrefix(evt.Name, testFilePrefix) {
t.Fatalf("Got an event for an unknown file: %s", evt.Name)
}
if evt.Op == Create {
creates++
}
if evt.Op == Remove {
removes++
}
}
}
// Drain remaining events from channels
count := 0
for count < 10 {
select {
case err := <-errChan:
t.Fatalf("Got an error from file creator goroutine: %v", err)
case err := <-w.Errors:
t.Fatalf("Got an error from watcher: %v", err)
case evt := <-w.Events:
if !strings.HasPrefix(evt.Name, testFilePrefix) {
t.Fatalf("Got an event for an unknown file: %s", evt.Name)
}
if evt.Op == Create {
creates++
}
if evt.Op == Remove {
removes++
}
count = 0
default:
count++
// Give the watcher chances to fill the channels.
time.Sleep(time.Millisecond)
}
}
if creates-removes > 1 || creates-removes < -1 {
t.Fatalf("Creates and removes should not be off by more than one: %d creates, %d removes", creates, removes)
}
if creates < 50 {
t.Fatalf("Expected at least 50 creates, got %d", creates)
}
}
func TestInotifyRemoveTwice(t *testing.T) {
testDir := tempMkdir(t)
defer os.RemoveAll(testDir)
testFile := filepath.Join(testDir, "testfile")
handle, err := os.Create(testFile)
if err != nil {
t.Fatalf("Create failed: %v", err)
}
handle.Close()
w, err := NewWatcher()
if err != nil {
t.Fatalf("Failed to create watcher: %v", err)
}
defer w.Close()
err = w.Add(testFile)
if err != nil {
t.Fatalf("Failed to add testFile: %v", err)
}
err = w.Remove(testFile)
if err != nil {
t.Fatalf("wanted successful remove but got: %v", err)
}
err = w.Remove(testFile)
if err == nil {
t.Fatalf("no error on removing invalid file")
}
w.mu.Lock()
defer w.mu.Unlock()
if len(w.watches) != 0 {
t.Fatalf("Expected watches len is 0, but got: %d, %v", len(w.watches), w.watches)
}
if len(w.paths) != 0 {
t.Fatalf("Expected paths len is 0, but got: %d, %v", len(w.paths), w.paths)
}
}
func TestInotifyInnerMapLength(t *testing.T) {
testDir := tempMkdir(t)
defer os.RemoveAll(testDir)
testFile := filepath.Join(testDir, "testfile")
handle, err := os.Create(testFile)
if err != nil {
t.Fatalf("Create failed: %v", err)
}
handle.Close()
w, err := NewWatcher()
if err != nil {
t.Fatalf("Failed to create watcher: %v", err)
}
defer w.Close()
err = w.Add(testFile)
if err != nil {
t.Fatalf("Failed to add testFile: %v", err)
}
go func() {
for err := range w.Errors {
t.Fatalf("error received: %s", err)
}
}()
err = os.Remove(testFile)
if err != nil {
t.Fatalf("Failed to remove testFile: %v", err)
}
_ = <-w.Events // consume Remove event
<-time.After(50 * time.Millisecond) // wait IN_IGNORE propagated
w.mu.Lock()
defer w.mu.Unlock()
if len(w.watches) != 0 {
t.Fatalf("Expected watches len is 0, but got: %d, %v", len(w.watches), w.watches)
}
if len(w.paths) != 0 {
t.Fatalf("Expected paths len is 0, but got: %d, %v", len(w.paths), w.paths)
}
}
func TestInotifyOverflow(t *testing.T) {
// We need to generate many more events than the
// fs.inotify.max_queued_events sysctl setting.
// We use multiple goroutines (one per directory)
// to speed up file creation.
numDirs := 128
numFiles := 1024
testDir := tempMkdir(t)
defer os.RemoveAll(testDir)
w, err := NewWatcher()
if err != nil {
t.Fatalf("Failed to create watcher: %v", err)
}
defer w.Close()
for dn := 0; dn < numDirs; dn++ {
testSubdir := fmt.Sprintf("%s/%d", testDir, dn)
err := os.Mkdir(testSubdir, 0777)
if err != nil {
t.Fatalf("Cannot create subdir: %v", err)
}
err = w.Add(testSubdir)
if err != nil {
t.Fatalf("Failed to add subdir: %v", err)
}
}
errChan := make(chan error, numDirs*numFiles)
// All events need to be in the inotify queue before pulling events off it to trigger this error.
wg := sync.WaitGroup{}
for dn := 0; dn < numDirs; dn++ {
testSubdir := fmt.Sprintf("%s/%d", testDir, dn)
wg.Add(1)
go func() {
for fn := 0; fn < numFiles; fn++ {
testFile := fmt.Sprintf("%s/%d", testSubdir, fn)
handle, err := os.Create(testFile)
if err != nil {
errChan <- fmt.Errorf("Create failed: %v", err)
continue
}
err = handle.Close()
if err != nil {
errChan <- fmt.Errorf("Close failed: %v", err)
continue
}
}
wg.Done()
}()
}
wg.Wait()
creates := 0
overflows := 0
after := time.After(10 * time.Second)
for overflows == 0 && creates < numDirs*numFiles {
select {
case <-after:
t.Fatalf("Not done")
case err := <-errChan:
t.Fatalf("Got an error from file creator goroutine: %v", err)
case err := <-w.Errors:
if err == ErrEventOverflow {
overflows++
} else {
t.Fatalf("Got an error from watcher: %v", err)
}
case evt := <-w.Events:
if !strings.HasPrefix(evt.Name, testDir) {
t.Fatalf("Got an event for an unknown file: %s", evt.Name)
}
if evt.Op == Create {
creates++
}
}
}
if creates == numDirs*numFiles {
t.Fatalf("Could not trigger overflow")
}
if overflows == 0 {
t.Fatalf("No overflow and not enough creates (expected %d, got %d)",
numDirs*numFiles, creates)
}
}
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