package provider import ( "os" "path/filepath" "strings" "github.com/BurntSushi/toml" log "github.com/Sirupsen/logrus" "github.com/containous/traefik/types" "gopkg.in/fsnotify.v1" ) // File holds configurations of the File provider. type File struct { BaseProvider `mapstructure:",squash"` } // Provide allows the provider to provide configurations to traefik // using the given configuration channel. func (provider *File) Provide(configurationChan chan<- types.ConfigMessage) error { watcher, err := fsnotify.NewWatcher() if err != nil { log.Error("Error creating file watcher", err) return err } file, err := os.Open(provider.Filename) if err != nil { log.Error("Error opening file", err) return err } defer file.Close() if provider.Watch { // Process events go func() { defer watcher.Close() for { select { case event := <-watcher.Events: if strings.Contains(event.Name, file.Name()) { log.Debug("File event:", event) configuration := provider.loadFileConfig(file.Name()) if configuration != nil { configurationChan <- types.ConfigMessage{ ProviderName: "file", Configuration: configuration, } } } case error := <-watcher.Errors: log.Error("Watcher event error", error) } } }() err = watcher.Add(filepath.Dir(file.Name())) if err != nil { log.Error("Error adding file watcher", err) return err } } configuration := provider.loadFileConfig(file.Name()) configurationChan <- types.ConfigMessage{ ProviderName: "file", Configuration: configuration, } return nil } func (provider *File) loadFileConfig(filename string) *types.Configuration { configuration := new(types.Configuration) if _, err := toml.DecodeFile(filename, configuration); err != nil { log.Error("Error reading file:", err) return nil } return configuration }