mirror of
https://github.com/containous/traefik.git
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d63d2a8a26
- libkv.WatchTree returns a channel whose messages represent changes to the watched tree. In situations where libkv cannot read from the underlying store, libkv will close the provided channel. - This PR handles this edge case and fixes #238.
180 lines
4.6 KiB
Go
180 lines
4.6 KiB
Go
// Package provider holds the different provider implementation.
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package provider
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import (
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"crypto/tls"
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"crypto/x509"
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"fmt"
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"io/ioutil"
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"strings"
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"text/template"
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"time"
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"github.com/BurntSushi/ty/fun"
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log "github.com/Sirupsen/logrus"
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"github.com/containous/traefik/types"
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"github.com/docker/libkv"
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"github.com/docker/libkv/store"
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)
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// Kv holds common configurations of key-value providers.
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type Kv struct {
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BaseProvider `mapstructure:",squash"`
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Endpoint string
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Prefix string
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TLS *KvTLS
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storeType store.Backend
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kvclient store.Store
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}
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// KvTLS holds TLS specific configurations
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type KvTLS struct {
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CA string
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Cert string
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Key string
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InsecureSkipVerify bool
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}
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func (provider *Kv) watchKv(configurationChan chan<- types.ConfigMessage, prefix string) {
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for {
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chanKeys, err := provider.kvclient.WatchTree(provider.Prefix, make(chan struct{}) /* stop chan */)
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if err != nil {
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log.Errorf("Failed to WatchTree %s", err)
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continue
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}
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for range chanKeys {
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configuration := provider.loadConfig()
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if configuration != nil {
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configurationChan <- types.ConfigMessage{
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ProviderName: string(provider.storeType),
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Configuration: configuration,
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}
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}
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}
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log.Warnf("Intermittent failure to WatchTree KV. Retrying.")
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}
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}
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func (provider *Kv) provide(configurationChan chan<- types.ConfigMessage) error {
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storeConfig := &store.Config{
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ConnectionTimeout: 30 * time.Second,
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Bucket: "traefik",
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}
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if provider.TLS != nil {
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caPool := x509.NewCertPool()
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if provider.TLS.CA != "" {
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ca, err := ioutil.ReadFile(provider.TLS.CA)
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if err != nil {
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return fmt.Errorf("Failed to read CA. %s", err)
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}
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caPool.AppendCertsFromPEM(ca)
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}
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cert, err := tls.LoadX509KeyPair(provider.TLS.Cert, provider.TLS.Key)
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if err != nil {
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return fmt.Errorf("Failed to load keypair. %s", err)
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}
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storeConfig.TLS = &tls.Config{
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Certificates: []tls.Certificate{cert},
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RootCAs: caPool,
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InsecureSkipVerify: provider.TLS.InsecureSkipVerify,
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}
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}
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kv, err := libkv.NewStore(
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provider.storeType,
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strings.Split(provider.Endpoint, ","),
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storeConfig,
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)
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if err != nil {
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return err
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}
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if _, err := kv.List(""); err != nil {
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return err
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}
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provider.kvclient = kv
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if provider.Watch {
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go provider.watchKv(configurationChan, provider.Prefix)
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}
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configuration := provider.loadConfig()
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configurationChan <- types.ConfigMessage{
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ProviderName: string(provider.storeType),
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Configuration: configuration,
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}
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return nil
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}
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func (provider *Kv) loadConfig() *types.Configuration {
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templateObjects := struct {
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Prefix string
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}{
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// Allow `/traefik/alias` to superesede `provider.Prefix`
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strings.TrimSuffix(provider.get(provider.Prefix, provider.Prefix+"/alias"), "/"),
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}
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var KvFuncMap = template.FuncMap{
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"List": provider.list,
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"Get": provider.get,
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"SplitGet": provider.splitGet,
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"Last": provider.last,
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}
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configuration, err := provider.getConfiguration("templates/kv.tmpl", KvFuncMap, templateObjects)
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if err != nil {
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log.Error(err)
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}
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return configuration
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}
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func (provider *Kv) list(keys ...string) []string {
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joinedKeys := strings.Join(keys, "")
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keysPairs, err := provider.kvclient.List(joinedKeys)
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if err != nil {
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log.Errorf("Error getting keys %s %s ", joinedKeys, err)
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return nil
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}
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directoryKeys := make(map[string]string)
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for _, key := range keysPairs {
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directory := strings.Split(strings.TrimPrefix(key.Key, strings.TrimPrefix(joinedKeys, "/")), "/")[0]
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directoryKeys[directory] = joinedKeys + directory
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}
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return fun.Values(directoryKeys).([]string)
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}
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func (provider *Kv) get(defaultValue string, keys ...string) string {
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joinedKeys := strings.Join(keys, "")
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keyPair, err := provider.kvclient.Get(joinedKeys)
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if err != nil {
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log.Warnf("Error getting key %s %s, setting default %s", joinedKeys, err, defaultValue)
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return defaultValue
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} else if keyPair == nil {
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log.Warnf("Error getting key %s, setting default %s", joinedKeys, defaultValue)
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return defaultValue
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}
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return string(keyPair.Value)
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}
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func (provider *Kv) splitGet(keys ...string) []string {
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joinedKeys := strings.Join(keys, "")
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keyPair, err := provider.kvclient.Get(joinedKeys)
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if err != nil {
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log.Warnf("Error getting key %s %s, setting default empty", joinedKeys, err)
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return []string{}
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} else if keyPair == nil {
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log.Warnf("Error getting key %s, setting default %empty", joinedKeys)
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return []string{}
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}
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return strings.Split(string(keyPair.Value), ",")
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}
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func (provider *Kv) last(key string) string {
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splittedKey := strings.Split(key, "/")
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return splittedKey[len(splittedKey)-1]
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}
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