| /* |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF licenses this file to You 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 sync provides useful tools to get notified when a file system resource changes |
| package sync |
| |
| import ( |
| "context" |
| "time" |
| |
| "github.com/apache/camel-k/pkg/util/log" |
| "github.com/radovskyb/watcher" |
| ) |
| |
| // File returns a channel that signals each time the content of the file changes |
| func File(ctx context.Context, path string) (<-chan bool, error) { |
| w := watcher.New() |
| if err := w.Add(path); err != nil { |
| return nil, err |
| } |
| w.FilterOps(watcher.Write) |
| |
| out := make(chan bool) |
| go func() { |
| for { |
| select { |
| case <-ctx.Done(): |
| return |
| case <-w.Event: |
| out <- true |
| } |
| } |
| }() |
| |
| go func() { |
| if err := w.Start(200 * time.Millisecond); err != nil { |
| log.Error(err, "Error while starting watcher") |
| close(out) |
| } |
| }() |
| |
| return out, nil |
| } |