147 lines
2.8 KiB
Go
147 lines
2.8 KiB
Go
package main
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import (
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"bytes"
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"compress/gzip"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"github.com/abronan/valkeyrie"
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"github.com/abronan/valkeyrie/store"
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"github.com/abronan/valkeyrie/store/boltdb"
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"github.com/abronan/valkeyrie/store/consul"
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etcdv3 "github.com/abronan/valkeyrie/store/etcd/v3"
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"github.com/abronan/valkeyrie/store/zookeeper"
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)
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const (
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storeKey = "traefik/acme/account/object"
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)
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func getStoredDataFromGzip(value []byte) (*StoredData, error) {
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data := &StoredData{}
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r, err := gzip.NewReader(bytes.NewBuffer(value))
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if err != nil {
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return data, err
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}
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acmeData, err := ioutil.ReadAll(r)
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if err != nil {
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return data, err
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}
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storedData := &StoredData{}
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if err := json.Unmarshal(acmeData, &storedData); err != nil {
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return data, err
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}
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return storedData, nil
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}
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// KVBackend represents a Key/Value pair backend
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type KVBackend struct {
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Name string
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Client []string
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Config *store.Config
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}
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func register(backend string) (store.Backend, error) {
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switch backend {
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case CONSUL:
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consul.Register()
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return store.CONSUL, nil
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case ETCD:
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etcdv3.Register()
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return store.ETCDV3, nil
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case ZOOKEEPER:
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zookeeper.Register()
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return store.ZK, nil
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case BOLTDB:
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boltdb.Register()
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return store.BOLTDB, nil
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default:
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return "", fmt.Errorf("no backend found for %v", backend)
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}
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}
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func loopKV(watch bool, kvstore store.Store, dataCh chan *StoredData, errCh chan error) {
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stopCh := make(<-chan struct{})
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events, err := kvstore.Watch(storeKey, stopCh, nil)
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if err != nil {
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errCh <- err
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}
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for {
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kvpair := <-events
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if kvpair == nil {
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errCh <- fmt.Errorf("could not fetch Key/Value pair for key %v", storeKey)
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return
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}
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dataCh <- extractStoredData(kvpair, errCh)
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if !watch {
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close(dataCh)
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close(errCh)
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}
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}
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}
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func extractStoredData(kvpair *store.KVPair, errCh chan error) *StoredData {
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storedData, err := getStoredDataFromGzip(kvpair.Value)
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if err != nil {
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errCh <- err
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}
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return storedData
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}
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func getSingleData(kvstore store.Store, dataCh chan *StoredData, errCh chan error) {
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kvpair, err := kvstore.Get(storeKey, nil)
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if err != nil {
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errCh <- err
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return
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}
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if kvpair == nil {
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errCh <- fmt.Errorf("could not fetch Key/Value pair for key %v", storeKey)
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return
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}
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dataCh <- extractStoredData(kvpair, errCh)
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close(dataCh)
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close(errCh)
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}
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func (b KVBackend) getStoredData(watch bool) (<-chan *StoredData, <-chan error) {
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dataCh := make(chan *StoredData)
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errCh := make(chan error)
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backend, err := register(b.Name)
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if err != nil {
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go func() {
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errCh <- err
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}()
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return dataCh, errCh
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}
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kvstore, err := valkeyrie.NewStore(
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backend,
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b.Client,
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b.Config,
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)
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if err != nil {
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go func() {
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errCh <- err
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}()
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return dataCh, errCh
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}
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if !watch {
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go getSingleData(kvstore, dataCh, errCh)
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return dataCh, errCh
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}
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go loopKV(watch, kvstore, dataCh, errCh)
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return dataCh, errCh
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}
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