403 lines
11 KiB
Go
403 lines
11 KiB
Go
package file
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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"text/template"
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"github.com/BurntSushi/toml"
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"github.com/Masterminds/sprig"
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"github.com/containous/traefik/pkg/config"
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"github.com/containous/traefik/pkg/log"
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"github.com/containous/traefik/pkg/provider"
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"github.com/containous/traefik/pkg/safe"
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"github.com/containous/traefik/pkg/tls"
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"gopkg.in/fsnotify.v1"
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"gopkg.in/yaml.v2"
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)
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const providerName = "file"
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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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Directory string `description:"Load configuration from one or more .toml files in a directory." export:"true"`
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Watch bool `description:"Watch provider." export:"true"`
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Filename string `description:"Override default configuration template. For advanced users :)" export:"true"`
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DebugLogGeneratedTemplate bool `description:"Enable debug logging of generated configuration template." export:"true"`
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TraefikFile string `description:"-"`
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}
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// SetDefaults sets the default values.
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func (p *Provider) SetDefaults() {
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p.Watch = true
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p.Filename = ""
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}
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// Init the provider
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func (p *Provider) Init() error {
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return nil
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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<- config.Message, pool *safe.Pool) 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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switch {
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case len(p.Directory) > 0:
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watchItem = p.Directory
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case len(p.Filename) > 0:
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watchItem = filepath.Dir(p.Filename)
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default:
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watchItem = filepath.Dir(p.TraefikFile)
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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() (*config.Configuration, error) {
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ctx := log.With(context.Background(), log.Str(log.ProviderName, providerName))
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if len(p.Directory) > 0 {
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return p.loadFileConfigFromDirectory(ctx, p.Directory, nil)
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}
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if len(p.Filename) > 0 {
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return p.loadFileConfig(p.Filename, true)
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}
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if len(p.TraefikFile) > 0 {
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return p.loadFileConfig(p.TraefikFile, false)
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}
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return nil, errors.New("error using file configuration backend, no filename defined")
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}
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func (p *Provider) addWatcher(pool *safe.Pool, directory string, configurationChan chan<- config.Message, callback func(chan<- config.Message, 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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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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// 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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var filename string
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if len(p.Filename) > 0 {
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filename = p.Filename
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} else {
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filename = p.TraefikFile
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}
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_, evtFileName := filepath.Split(evt.Name)
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_, confFileName := filepath.Split(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.WithoutContext().WithField(log.ProviderName, providerName).Errorf("Watcher event error: %s", err)
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}
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}
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})
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return nil
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}
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func (p *Provider) watcherCallback(configurationChan chan<- config.Message, event fsnotify.Event) {
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watchItem := p.TraefikFile
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if len(p.Directory) > 0 {
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watchItem = p.Directory
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} else if len(p.Filename) > 0 {
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watchItem = p.Filename
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}
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logger := log.WithoutContext().WithField(log.ProviderName, providerName)
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if _, err := os.Stat(watchItem); err != nil {
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logger.Errorf("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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logger.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<- config.Message, configuration *config.Configuration) {
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configurationChan <- config.Message{
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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 (p *Provider) loadFileConfig(filename string, parseTemplate bool) (*config.Configuration, error) {
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var err error
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var configuration *config.Configuration
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if parseTemplate {
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configuration, err = p.CreateConfiguration(filename, template.FuncMap{}, false)
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} else {
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configuration, err = p.DecodeConfiguration(filename)
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}
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if err != nil {
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return nil, err
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}
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var tlsConfigs []*tls.Configuration
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for _, conf := range configuration.TLS {
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bytes, err := conf.Certificate.CertFile.Read()
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if err != nil {
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log.Error(err)
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continue
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}
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conf.Certificate.CertFile = tls.FileOrContent(string(bytes))
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bytes, err = conf.Certificate.KeyFile.Read()
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if err != nil {
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log.Error(err)
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continue
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}
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conf.Certificate.KeyFile = tls.FileOrContent(string(bytes))
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tlsConfigs = append(tlsConfigs, conf)
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}
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configuration.TLS = tlsConfigs
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return configuration, nil
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}
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func (p *Provider) loadFileConfigFromDirectory(ctx context.Context, directory string, configuration *config.Configuration) (*config.Configuration, error) {
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logger := log.FromContext(ctx)
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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 = &config.Configuration{
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HTTP: &config.HTTPConfiguration{
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Routers: make(map[string]*config.Router),
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Middlewares: make(map[string]*config.Middleware),
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Services: make(map[string]*config.Service),
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},
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TCP: &config.TCPConfiguration{
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Routers: make(map[string]*config.TCPRouter),
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Services: make(map[string]*config.TCPService),
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},
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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 = p.loadFileConfigFromDirectory(ctx, 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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}
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switch strings.ToLower(filepath.Ext(item.Name())) {
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case ".toml", ".yaml", ".yml":
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// noop
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default:
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continue
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}
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var c *config.Configuration
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c, err = p.loadFileConfig(filepath.Join(directory, item.Name()), true)
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if err != nil {
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return configuration, err
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}
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for name, conf := range c.HTTP.Routers {
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if _, exists := configuration.HTTP.Routers[name]; exists {
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logger.WithField(log.RouterName, name).Warn("HTTP router already configured, skipping")
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} else {
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configuration.HTTP.Routers[name] = conf
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}
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}
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for name, conf := range c.HTTP.Middlewares {
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if _, exists := configuration.HTTP.Middlewares[name]; exists {
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logger.WithField(log.MiddlewareName, name).Warn("HTTP middleware already configured, skipping")
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} else {
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configuration.HTTP.Middlewares[name] = conf
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}
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}
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for name, conf := range c.HTTP.Services {
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if _, exists := configuration.HTTP.Services[name]; exists {
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logger.WithField(log.ServiceName, name).Warn("HTTP service already configured, skipping")
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} else {
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configuration.HTTP.Services[name] = conf
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}
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}
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for name, conf := range c.TCP.Routers {
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if _, exists := configuration.TCP.Routers[name]; exists {
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logger.WithField(log.RouterName, name).Warn("TCP router already configured, skipping")
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} else {
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configuration.TCP.Routers[name] = conf
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}
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}
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for name, conf := range c.TCP.Services {
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if _, exists := configuration.TCP.Services[name]; exists {
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logger.WithField(log.ServiceName, name).Warn("TCP service already configured, skipping")
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} else {
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configuration.TCP.Services[name] = conf
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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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logger.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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// CreateConfiguration creates a provider configuration from content using templating.
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func (p *Provider) CreateConfiguration(filename string, funcMap template.FuncMap, templateObjects interface{}) (*config.Configuration, error) {
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tmplContent, err := readFile(filename)
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if err != nil {
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return nil, fmt.Errorf("error reading configuration file: %s - %s", filename, err)
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}
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var defaultFuncMap = sprig.TxtFuncMap()
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defaultFuncMap["normalize"] = provider.Normalize
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defaultFuncMap["split"] = strings.Split
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for funcID, funcElement := range funcMap {
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defaultFuncMap[funcID] = funcElement
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}
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tmpl := template.New(p.Filename).Funcs(defaultFuncMap)
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_, err = tmpl.Parse(tmplContent)
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if err != nil {
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return nil, err
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}
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var buffer bytes.Buffer
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err = tmpl.Execute(&buffer, templateObjects)
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if err != nil {
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return nil, err
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}
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var renderedTemplate = buffer.String()
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if p.DebugLogGeneratedTemplate {
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logger := log.WithoutContext().WithField(log.ProviderName, providerName)
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logger.Debugf("Template content: %s", tmplContent)
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logger.Debugf("Rendering results: %s", renderedTemplate)
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}
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return p.decodeConfiguration(filename, renderedTemplate)
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}
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// DecodeConfiguration Decodes a *types.Configuration from a content.
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func (p *Provider) DecodeConfiguration(filename string) (*config.Configuration, error) {
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content, err := readFile(filename)
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if err != nil {
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return nil, fmt.Errorf("error reading configuration file: %s - %s", filename, err)
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}
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return p.decodeConfiguration(filename, content)
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}
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func (p *Provider) decodeConfiguration(filePath string, content string) (*config.Configuration, error) {
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configuration := &config.Configuration{
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HTTP: &config.HTTPConfiguration{
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Routers: make(map[string]*config.Router),
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Middlewares: make(map[string]*config.Middleware),
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Services: make(map[string]*config.Service),
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},
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TCP: &config.TCPConfiguration{
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Routers: make(map[string]*config.TCPRouter),
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Services: make(map[string]*config.TCPService),
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},
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TLS: make([]*tls.Configuration, 0),
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TLSStores: make(map[string]tls.Store),
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TLSOptions: make(map[string]tls.TLS),
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}
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switch strings.ToLower(filepath.Ext(filePath)) {
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case ".toml":
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_, err := toml.Decode(content, configuration)
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if err != nil {
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return nil, err
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}
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case ".yml", ".yaml":
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var err error
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err = yaml.Unmarshal([]byte(content), configuration)
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if err != nil {
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return nil, err
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}
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default:
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return nil, fmt.Errorf("unsupported file extension: %s", filePath)
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}
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return configuration, nil
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}
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func readFile(filename string) (string, error) {
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if len(filename) > 0 {
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buf, err := ioutil.ReadFile(filename)
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if err != nil {
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return "", err
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}
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return string(buf), nil
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}
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return "", fmt.Errorf("invalid filename: %s", filename)
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}
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