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* feat: wasm module hot reload Co-authored-by: seeflood <349895584@qq.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| package wasm | ||
|
|
||
| import ( | ||
| "os" | ||
| "path/filepath" | ||
| "strings" | ||
|
|
||
| v2 "mosn.io/mosn/pkg/config/v2" | ||
| "mosn.io/mosn/pkg/log" | ||
| "mosn.io/mosn/pkg/wasm" | ||
|
|
||
| "github.com/fsnotify/fsnotify" | ||
| ) | ||
|
|
||
| var ( | ||
| watcher *fsnotify.Watcher | ||
| configs = make(map[string]*filterConfig) | ||
| pluginNames = make(map[string]string) | ||
| ) | ||
|
|
||
| func init() { | ||
| var err error | ||
| watcher, err = fsnotify.NewWatcher() | ||
| if err != nil { | ||
| log.DefaultLogger.Errorf("[proxywasm] [watcher] init fail to create watcher: %v", err) | ||
| return | ||
| } | ||
| go runWatcher() | ||
| } | ||
|
|
||
| func runWatcher() { | ||
| for { | ||
| select { | ||
| case event, ok := <-watcher.Events: | ||
| if !ok { | ||
| log.DefaultLogger.Errorf("[proxywasm] [watcher] runWatcher exit") | ||
| return | ||
| } | ||
| log.DefaultLogger.Debugf("[proxywasm] [watcher] runWatcher got event, %s", event) | ||
|
|
||
| if pathIsWasmFile(event.Name) { | ||
| if event.Op&fsnotify.Chmod == fsnotify.Chmod || | ||
| event.Op&fsnotify.Rename == fsnotify.Rename { | ||
| continue | ||
| } else if event.Op&fsnotify.Remove == fsnotify.Remove { | ||
| // rewatch the file if it exists | ||
| // remove this file then nename other file to this name will cause this case | ||
| if fileExist(event.Name) { | ||
| _ = watcher.Add(event.Name) | ||
| } | ||
| continue | ||
| } else if event.Op&fsnotify.Create == fsnotify.Create { | ||
| if fileExist(event.Name) { | ||
| _ = watcher.Add(event.Name) | ||
| } | ||
| } | ||
| reloadWasm(event.Name) | ||
| } | ||
| case err, ok := <-watcher.Errors: | ||
| if !ok { | ||
| log.DefaultLogger.Errorf("[proxywasm] [watcher] runWatcher exit") | ||
| return | ||
| } | ||
| log.DefaultLogger.Errorf("[proxywasm] [watcher] runWatcher got errors, err: %v", err) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func addWatchFile(cfg *filterConfig, pluginName string) { | ||
| path := cfg.VmConfig.Path | ||
| if err := watcher.Add(path); err != nil { | ||
| log.DefaultLogger.Errorf("[proxywasm] [watcher] addWatchFile fail to watch wasm file, err: %v", err) | ||
| return | ||
| } | ||
|
|
||
| dir := filepath.Dir(path) | ||
| if err := watcher.Add(dir); err != nil { | ||
| log.DefaultLogger.Errorf("[proxywasm] [watcher] addWatchFile fail to watch wasm dir, err: %v", err) | ||
| return | ||
| } | ||
|
|
||
| configs[path] = cfg | ||
| pluginNames[path] = pluginName | ||
| log.DefaultLogger.Infof("[proxywasm] [watcher] addWatchFile start to watch wasm file and its dir: %s", path) | ||
| } | ||
|
|
||
| func reloadWasm(fullPath string) { | ||
| found := false | ||
|
|
||
| for path, config := range configs { | ||
| if strings.HasSuffix(fullPath, path) { | ||
| found = true | ||
| pluginName := pluginNames[path] | ||
|
|
||
| err := wasm.GetWasmManager().UninstallWasmPluginByName(pluginName) | ||
| if err != nil { | ||
| log.DefaultLogger.Errorf("[proxywasm] [watcher] reloadWasm fail to uninstall plugin, err: %v", err) | ||
| } | ||
|
|
||
| v2Config := v2.WasmPluginConfig{ | ||
| PluginName: pluginName, | ||
| VmConfig: config.VmConfig, | ||
| InstanceNum: config.InstanceNum, | ||
| } | ||
| err = wasm.GetWasmManager().AddOrUpdateWasm(v2Config) | ||
| if err != nil { | ||
| log.DefaultLogger.Errorf("[proxywasm] [watcher] reloadWasm fail to add plugin, err: %v", err) | ||
| return | ||
| } | ||
|
|
||
| pw := wasm.GetWasmManager().GetWasmPluginWrapperByName(pluginName) | ||
| if pw == nil { | ||
| log.DefaultLogger.Errorf("[proxywasm] [watcher] reloadWasm plugin not found") | ||
| return | ||
| } | ||
|
|
||
| factory := &FilterConfigFactory{ | ||
| pluginName: pluginName, | ||
| config: config, | ||
| } | ||
| pw.RegisterPluginHandler(factory) | ||
|
|
||
| log.DefaultLogger.Infof("[proxywasm] [watcher] reloadWasm reload wasm success: %s", path) | ||
| } | ||
| } | ||
|
|
||
| if !found { | ||
| log.DefaultLogger.Errorf("[proxywasm] [watcher] reloadWasm WasmPluginConfig not found: %s", fullPath) | ||
| } | ||
| } | ||
|
|
||
| func fileExist(file string) bool { | ||
| _, err := os.Stat(file) | ||
| if err != nil && !os.IsExist(err) { | ||
| return false | ||
| } | ||
| return true | ||
| } | ||
|
|
||
| func pathIsWasmFile(fullPath string) bool { | ||
| for path, _ := range configs { | ||
| if strings.HasSuffix(fullPath, path) { | ||
| return true | ||
| } | ||
| } | ||
| return false | ||
| } |