129 lines
3.7 KiB
Go
129 lines
3.7 KiB
Go
package kv
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import (
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"errors"
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"fmt"
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"strings"
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"time"
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"github.com/abronan/valkeyrie"
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"github.com/abronan/valkeyrie/store"
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"github.com/cenk/backoff"
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"github.com/containous/traefik/job"
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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/types"
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)
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// Provider holds common configurations of key-value providers.
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type Provider struct {
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provider.BaseProvider `mapstructure:",squash" export:"true"`
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Endpoint string `description:"Comma separated server endpoints"`
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Prefix string `description:"Prefix used for KV store" export:"true"`
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TLS *types.ClientTLS `description:"Enable TLS support" export:"true"`
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Username string `description:"KV Username"`
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Password string `description:"KV Password"`
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storeType store.Backend
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kvClient store.Store
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}
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// CreateStore create the K/V store
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func (p *Provider) CreateStore() (store.Store, 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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Username: p.Username,
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Password: p.Password,
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}
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if p.TLS != nil {
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var err error
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storeConfig.TLS, err = p.TLS.CreateTLSConfig()
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if err != nil {
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return nil, err
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}
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}
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return valkeyrie.NewStore(
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p.storeType,
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strings.Split(p.Endpoint, ","),
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storeConfig,
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)
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}
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// SetStoreType storeType setter
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func (p *Provider) SetStoreType(storeType store.Backend) {
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p.storeType = storeType
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}
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// SetKVClient kvClient setter
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func (p *Provider) SetKVClient(kvClient store.Store) {
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p.kvClient = kvClient
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}
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func (p *Provider) watchKv(configurationChan chan<- types.ConfigMessage, prefix string, stop chan bool) error {
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operation := func() error {
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events, err := p.kvClient.WatchTree(p.Prefix, make(chan struct{}), nil)
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if err != nil {
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return fmt.Errorf("failed to KV WatchTree: %v", err)
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}
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for {
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select {
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case <-stop:
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return nil
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case _, ok := <-events:
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if !ok {
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return errors.New("watchtree channel closed")
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}
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configuration := p.buildConfiguration()
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if configuration != nil {
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configurationChan <- types.ConfigMessage{
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ProviderName: string(p.storeType),
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Configuration: configuration,
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}
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}
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}
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}
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}
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notify := func(err error, time time.Duration) {
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log.Errorf("KV connection error: %+v, retrying in %s", err, time)
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}
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err := backoff.RetryNotify(safe.OperationWithRecover(operation), job.NewBackOff(backoff.NewExponentialBackOff()), notify)
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if err != nil {
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return fmt.Errorf("cannot connect to KV server: %v", err)
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}
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return nil
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}
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// Provide provides the configuration to traefik via the configuration channel
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func (p *Provider) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool) error {
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operation := func() error {
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if _, err := p.kvClient.Exists(p.Prefix+"/qmslkjdfmqlskdjfmqlksjazçueznbvbwzlkajzebvkwjdcqmlsfj", nil); err != nil {
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return fmt.Errorf("failed to test KV store connection: %v", err)
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}
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if p.Watch {
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pool.Go(func(stop chan bool) {
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err := p.watchKv(configurationChan, p.Prefix, stop)
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if err != nil {
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log.Errorf("Cannot watch KV store: %v", err)
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}
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})
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}
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configuration := p.buildConfiguration()
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configurationChan <- types.ConfigMessage{
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ProviderName: string(p.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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notify := func(err error, time time.Duration) {
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log.Errorf("KV connection error: %+v, retrying in %s", err, time)
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}
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err := backoff.RetryNotify(safe.OperationWithRecover(operation), job.NewBackOff(backoff.NewExponentialBackOff()), notify)
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if err != nil {
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return fmt.Errorf("cannot connect to KV server: %v", err)
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}
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return nil
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}
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