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