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Merge pull request #769 from nilo19/feat/inotify
feat: support reloading the cloud controller manager based on the changes of the config file
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| /* | ||
| Copyright 2021 The Kubernetes 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 dynamic | ||
|
|
||
| import ( | ||
| "os" | ||
| "strings" | ||
| "time" | ||
|
|
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| "github.com/fsnotify/fsnotify" | ||
|
|
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| "k8s.io/klog/v2" | ||
| ) | ||
|
|
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| func RunFileWatcherOrDie(path string) chan struct{} { | ||
| watcher, err := fsnotify.NewWatcher() | ||
| if err != nil { | ||
| klog.Errorf("RunFileWatcherOrDie: failed to initialize file watcher: %s", err) | ||
| os.Exit(1) | ||
| } | ||
|
|
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| startWatchingOrDie(watcher, path, 5) | ||
|
|
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| updateChan := make(chan struct{}) | ||
| go func() { | ||
| for { | ||
| select { | ||
| case event, ok := <-watcher.Events: | ||
| if !ok { | ||
| klog.Error("RunFileWatcherOrDie: events channel closed unexpectedly") | ||
| _ = watcher.Close() | ||
| os.Exit(1) | ||
| } | ||
|
|
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| klog.Infof("RunFileWatcherOrDie: found file update event: %v", event) | ||
| updateChan <- struct{}{} | ||
|
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| if strings.EqualFold(event.Name, path) && event.Op&fsnotify.Remove == fsnotify.Remove { | ||
| startWatchingOrDie(watcher, path, 5) | ||
| } | ||
| case err, ok := <-watcher.Errors: | ||
| if !ok { | ||
| klog.Error("RunFileWatcherOrDie: errors channel closed unexpectedly") | ||
| _ = watcher.Close() | ||
| os.Exit(1) | ||
| } | ||
|
|
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| klog.Errorf("RunFileWatcherOrDie: failed to watch file %s: %s", path, err.Error()) | ||
| _ = watcher.Close() | ||
| os.Exit(1) | ||
| } | ||
| } | ||
| }() | ||
|
|
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| return updateChan | ||
| } | ||
|
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| func startWatchingOrDie(watcher *fsnotify.Watcher, path string, maxRetries int) { | ||
| attempt := 0 | ||
| for { | ||
| err := watcher.Add(path) | ||
| if err != nil { | ||
| if attempt < maxRetries { | ||
| attempt++ | ||
| klog.Warningf("RunFileWatcherOrDie: failed to watch %s: %s, will retry", path, err.Error()) | ||
| time.Sleep(time.Second) | ||
| continue | ||
| } else { | ||
| klog.Errorf("RunFileWatcherOrDie: failed to watch %s after %d times retry", maxRetries) | ||
| _ = watcher.Close() | ||
| os.Exit(1) | ||
| } | ||
| } | ||
|
|
||
| break | ||
| } | ||
| } |
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