447 lines
14 KiB
Go
447 lines
14 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/Masterminds/sprig"
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"github.com/traefik/paerser/file"
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"github.com/traefik/traefik/v2/pkg/config/dynamic"
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"github.com/traefik/traefik/v2/pkg/log"
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"github.com/traefik/traefik/v2/pkg/provider"
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"github.com/traefik/traefik/v2/pkg/safe"
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"github.com/traefik/traefik/v2/pkg/tls"
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"gopkg.in/fsnotify.v1"
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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 dynamic configuration from one or more .toml or .yml files in a directory." json:"directory,omitempty" toml:"directory,omitempty" yaml:"directory,omitempty" export:"true"`
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Watch bool `description:"Watch provider." json:"watch,omitempty" toml:"watch,omitempty" yaml:"watch,omitempty" export:"true"`
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Filename string `description:"Load dynamic configuration from a file." json:"filename,omitempty" toml:"filename,omitempty" yaml:"filename,omitempty" export:"true"`
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DebugLogGeneratedTemplate bool `description:"Enable debug logging of generated configuration template." json:"debugLogGeneratedTemplate,omitempty" toml:"debugLogGeneratedTemplate,omitempty" yaml:"debugLogGeneratedTemplate,omitempty" export:"true"`
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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<- dynamic.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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return errors.New("error using file configuration provider, neither filename or directory defined")
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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
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// specified by 'Filename'/'Directory' and returns a 'Configuration' object.
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func (p *Provider) BuildConfiguration() (*dynamic.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(ctx, p.Filename, true)
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}
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return nil, errors.New("error using file configuration provider, neither filename or directory defined")
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}
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func (p *Provider) addWatcher(pool *safe.Pool, directory string, configurationChan chan<- dynamic.Message, callback func(chan<- dynamic.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: %w", 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: %w", err)
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}
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// Process events
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pool.GoCtx(func(ctx context.Context) {
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defer watcher.Close()
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for {
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select {
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case <-ctx.Done():
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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.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<- dynamic.Message, event fsnotify.Event) {
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watchItem := p.Filename
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if len(p.Directory) > 0 {
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watchItem = p.Directory
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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<- dynamic.Message, configuration *dynamic.Configuration) {
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configurationChan <- dynamic.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(ctx context.Context, filename string, parseTemplate bool) (*dynamic.Configuration, error) {
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var err error
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var configuration *dynamic.Configuration
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if parseTemplate {
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configuration, err = p.CreateConfiguration(ctx, 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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if configuration.TLS != nil {
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configuration.TLS.Certificates = flattenCertificates(ctx, configuration.TLS)
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}
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return configuration, nil
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}
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func flattenCertificates(ctx context.Context, tlsConfig *dynamic.TLSConfiguration) []*tls.CertAndStores {
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var certs []*tls.CertAndStores
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for _, cert := range tlsConfig.Certificates {
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content, err := cert.Certificate.CertFile.Read()
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if err != nil {
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log.FromContext(ctx).Error(err)
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continue
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}
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cert.Certificate.CertFile = tls.FileOrContent(string(content))
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content, err = cert.Certificate.KeyFile.Read()
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if err != nil {
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log.FromContext(ctx).Error(err)
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continue
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}
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cert.Certificate.KeyFile = tls.FileOrContent(string(content))
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certs = append(certs, cert)
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}
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return certs
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}
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func (p *Provider) loadFileConfigFromDirectory(ctx context.Context, directory string, configuration *dynamic.Configuration) (*dynamic.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: %w", directory, err)
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}
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if configuration == nil {
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configuration = &dynamic.Configuration{
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HTTP: &dynamic.HTTPConfiguration{
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Routers: make(map[string]*dynamic.Router),
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Middlewares: make(map[string]*dynamic.Middleware),
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Services: make(map[string]*dynamic.Service),
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ServersTransports: make(map[string]*dynamic.ServersTransport),
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},
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TCP: &dynamic.TCPConfiguration{
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Routers: make(map[string]*dynamic.TCPRouter),
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Services: make(map[string]*dynamic.TCPService),
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},
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TLS: &dynamic.TLSConfiguration{
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Stores: make(map[string]tls.Store),
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Options: make(map[string]tls.Options),
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},
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UDP: &dynamic.UDPConfiguration{
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Routers: make(map[string]*dynamic.UDPRouter),
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Services: make(map[string]*dynamic.UDPService),
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},
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}
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}
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configTLSMaps := make(map[*tls.CertAndStores]struct{})
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for _, item := range fileList {
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logger := log.FromContext(log.With(ctx, log.Str("filename", item.Name())))
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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: %w", 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 *dynamic.Configuration
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c, err = p.loadFileConfig(ctx, filepath.Join(directory, item.Name()), true)
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if err != nil {
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return configuration, fmt.Errorf("%s: %w", filepath.Join(directory, item.Name()), 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.HTTP.ServersTransports {
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if _, exists := configuration.HTTP.ServersTransports[name]; exists {
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logger.WithField(log.ServersTransportName, name).Warn("HTTP servers transport already configured, skipping")
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} else {
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configuration.HTTP.ServersTransports[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 name, conf := range c.UDP.Routers {
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if _, exists := configuration.UDP.Routers[name]; exists {
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logger.WithField(log.RouterName, name).Warn("UDP router already configured, skipping")
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} else {
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configuration.UDP.Routers[name] = conf
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}
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}
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for name, conf := range c.UDP.Services {
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if _, exists := configuration.UDP.Services[name]; exists {
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logger.WithField(log.ServiceName, name).Warn("UDP service already configured, skipping")
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} else {
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configuration.UDP.Services[name] = conf
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}
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}
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for _, conf := range c.TLS.Certificates {
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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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for name, conf := range c.TLS.Options {
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if _, exists := configuration.TLS.Options[name]; exists {
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logger.Warnf("TLS options %v already configured, skipping", name)
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} else {
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if configuration.TLS.Options == nil {
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configuration.TLS.Options = map[string]tls.Options{}
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}
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configuration.TLS.Options[name] = conf
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}
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}
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for name, conf := range c.TLS.Stores {
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if _, exists := configuration.TLS.Stores[name]; exists {
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logger.Warnf("TLS store %v already configured, skipping", name)
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} else {
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if configuration.TLS.Stores == nil {
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configuration.TLS.Stores = map[string]tls.Store{}
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}
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configuration.TLS.Stores[name] = conf
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}
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}
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}
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if len(configTLSMaps) > 0 && configuration.TLS == nil {
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configuration.TLS = &dynamic.TLSConfiguration{}
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}
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for conf := range configTLSMaps {
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configuration.TLS.Certificates = append(configuration.TLS.Certificates, 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(ctx context.Context, filename string, funcMap template.FuncMap, templateObjects interface{}) (*dynamic.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 - %w", filename, err)
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}
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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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renderedTemplate := buffer.String()
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if p.DebugLogGeneratedTemplate {
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logger := log.FromContext(ctx)
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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) (*dynamic.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 - %w", 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, content string) (*dynamic.Configuration, error) {
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configuration := &dynamic.Configuration{
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HTTP: &dynamic.HTTPConfiguration{
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Routers: make(map[string]*dynamic.Router),
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Middlewares: make(map[string]*dynamic.Middleware),
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Services: make(map[string]*dynamic.Service),
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ServersTransports: make(map[string]*dynamic.ServersTransport),
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},
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TCP: &dynamic.TCPConfiguration{
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Routers: make(map[string]*dynamic.TCPRouter),
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Services: make(map[string]*dynamic.TCPService),
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},
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TLS: &dynamic.TLSConfiguration{
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Stores: make(map[string]tls.Store),
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Options: make(map[string]tls.Options),
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},
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UDP: &dynamic.UDPConfiguration{
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Routers: make(map[string]*dynamic.UDPRouter),
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Services: make(map[string]*dynamic.UDPService),
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},
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}
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err := file.DecodeContent(content, strings.ToLower(filepath.Ext(filePath)), configuration)
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if err != nil {
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return nil, err
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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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