135 lines
3.5 KiB
Go
135 lines
3.5 KiB
Go
// Package provider holds the different provider implementation.
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package provider
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import (
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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/docker/libkv"
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"github.com/docker/libkv/store"
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"github.com/emilevauge/traefik/types"
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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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storeType store.Backend
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kvclient store.Store
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}
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func (provider *Kv) provide(configurationChan chan<- types.ConfigMessage) error {
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kv, err := libkv.NewStore(
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provider.storeType,
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[]string{provider.Endpoint},
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&store.Config{
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ConnectionTimeout: 30 * time.Second,
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Bucket: "traefik",
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},
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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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stopCh := make(chan struct{})
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chanKeys, err := kv.WatchTree(provider.Prefix, stopCh)
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if err != nil {
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return err
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}
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go func() {
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for {
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<-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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defer close(stopCh)
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}
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}()
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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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