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fakefilewatcher.go
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fakefilewatcher.go
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// Copyright 2018 Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package filewatcher
import (
"errors"
"fmt"
"sync"
"github.com/fsnotify/fsnotify"
)
// NewFileWatcherFunc returns a functions which creates a new file
// watcher. This may be used to provide test hooks for using the
// FakeWatcher implementation below.
type NewFileWatcherFunc func() FileWatcher
// FakeWatcher provides a fake file watcher implementation for unit
// tests. Production code should use the `NewWatcher()`.
type FakeWatcher struct {
sync.Mutex
events map[string]chan fsnotify.Event
errors map[string]chan error
changedFunc func(path string, added bool)
}
// InjectEvent injects an event into the fake file watcher.
func (w *FakeWatcher) InjectEvent(path string, event fsnotify.Event) {
w.Lock()
ch, ok := w.events[path]
w.Unlock()
if ok {
ch <- event
}
}
// InjectError injects an error into the fake file watcher.
func (w *FakeWatcher) InjectError(path string, err error) {
w.Lock()
ch, ok := w.errors[path]
w.Unlock()
if ok {
ch <- err
}
}
// NewFakeWatcher returns a function which creates a new fake watcher for unit
// testing. This allows observe callers to inject events and errors per-watched
// path. changedFunc() provides a callback notification when a new watch is added
// or removed. Production code should use `NewWatcher()`.
func NewFakeWatcher(changedFunc func(path string, added bool)) (NewFileWatcherFunc, *FakeWatcher) {
w := &FakeWatcher{
events: make(map[string]chan fsnotify.Event),
errors: make(map[string]chan error),
changedFunc: changedFunc,
}
return func() FileWatcher {
return w
}, w
}
// Add is a fake implementation of the FileWatcher interface.
func (w *FakeWatcher) Add(path string) error {
w.Lock()
// w.events and w.errors are always updated togeather. We only check
// the first to determine existence.
if _, ok := w.events[path]; ok {
w.Unlock()
return fmt.Errorf("path %v already exists", path)
}
w.events[path] = make(chan fsnotify.Event, 1000)
w.errors[path] = make(chan error, 1000)
w.Unlock()
if w.changedFunc != nil {
w.changedFunc(path, true)
}
return nil
}
// Remove is a fake implementation of the FileWatcher interface.
func (w *FakeWatcher) Remove(path string) error {
w.Lock()
defer w.Unlock()
if _, ok := w.events[path]; !ok {
return errors.New("path doesn't exist")
}
delete(w.events, path)
delete(w.errors, path)
if w.changedFunc != nil {
w.changedFunc(path, false)
}
return nil
}
// Close is a fake implementation of the FileWatcher interface.
func (w *FakeWatcher) Close() error {
w.Lock()
for path, ch := range w.events {
close(ch)
delete(w.events, path)
}
for path, ch := range w.errors {
close(ch)
delete(w.errors, path)
}
defer w.Unlock()
return nil
}
// Events is a fake implementation of the FileWatcher interface.
func (w *FakeWatcher) Events(path string) chan fsnotify.Event {
w.Lock()
defer w.Unlock()
return w.events[path]
}
// Errors is a fake implementation of the FileWatcher interface.
func (w *FakeWatcher) Errors(path string) chan error {
w.Lock()
defer w.Unlock()
return w.errors[path]
}