package file import ( "fmt" "io/ioutil" "path" "strings" "github.com/BurntSushi/toml" "github.com/containous/traefik/log" "github.com/containous/traefik/provider" "github.com/containous/traefik/safe" "github.com/containous/traefik/types" "gopkg.in/fsnotify.v1" ) var _ provider.Provider = (*Provider)(nil) // Provider holds configurations of the provider. type Provider struct { provider.BaseProvider `mapstructure:",squash" export:"true"` Directory string `description:"Load configuration from one or more .toml files in a directory" export:"true"` } // Provide allows the file provider to provide configurations to traefik // using the given configuration channel. func (p *Provider) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, constraints types.Constraints) error { configuration, err := p.loadConfig() if err != nil { return err } if p.Watch { var watchItem string if p.Directory != "" { watchItem = p.Directory } else { watchItem = p.Filename } if err := p.addWatcher(pool, watchItem, configurationChan, p.watcherCallback); err != nil { return err } } sendConfigToChannel(configurationChan, configuration) return nil } func (p *Provider) addWatcher(pool *safe.Pool, directory string, configurationChan chan<- types.ConfigMessage, callback func(chan<- types.ConfigMessage, fsnotify.Event)) error { watcher, err := fsnotify.NewWatcher() if err != nil { return fmt.Errorf("error creating file watcher: %s", err) } // Process events pool.Go(func(stop chan bool) { defer watcher.Close() for { select { case <-stop: return case evt := <-watcher.Events: callback(configurationChan, evt) case err := <-watcher.Errors: log.Errorf("Watcher event error: %s", err) } } }) err = watcher.Add(directory) if err != nil { return fmt.Errorf("error adding file watcher: %s", err) } return nil } func sendConfigToChannel(configurationChan chan<- types.ConfigMessage, configuration *types.Configuration) { configurationChan <- types.ConfigMessage{ ProviderName: "file", Configuration: configuration, } } func loadFileConfig(filename string) (*types.Configuration, error) { configuration := new(types.Configuration) if _, err := toml.DecodeFile(filename, configuration); err != nil { return nil, fmt.Errorf("error reading configuration file: %s", err) } return configuration, nil } func loadFileConfigFromDirectory(directory string) (*types.Configuration, error) { fileList, err := ioutil.ReadDir(directory) if err != nil { return nil, fmt.Errorf("unable to read directory %s: %v", directory, err) } configuration := &types.Configuration{ Frontends: make(map[string]*types.Frontend), Backends: make(map[string]*types.Backend), } for _, file := range fileList { if !strings.HasSuffix(file.Name(), ".toml") { continue } var c *types.Configuration c, err = loadFileConfig(path.Join(directory, file.Name())) if err != nil { return nil, err } for backendName, backend := range c.Backends { if _, exists := configuration.Backends[backendName]; exists { log.Warnf("Backend %s already configured, skipping", backendName) } else { configuration.Backends[backendName] = backend } } for frontendName, frontend := range c.Frontends { if _, exists := configuration.Frontends[frontendName]; exists { log.Warnf("Frontend %s already configured, skipping", frontendName) } else { configuration.Frontends[frontendName] = frontend } } } return configuration, nil } func (p *Provider) watcherCallback(configurationChan chan<- types.ConfigMessage, event fsnotify.Event) { configuration, err := p.loadConfig() if err != nil { log.Errorf("Error occurred during watcher callback: %s", err) return } sendConfigToChannel(configurationChan, configuration) } func (p *Provider) loadConfig() (*types.Configuration, error) { if p.Directory != "" { return loadFileConfigFromDirectory(p.Directory) } return loadFileConfig(p.Filename) }