Add vendor files for spf13/viper

vendor/github.com/xordataexchange/crypt/backend/etcd/etcd.go

@@ -0,0 +1,116 @@
+package etcd
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/xordataexchange/crypt/backend"
+
+	goetcd "github.com/coreos/etcd/client"
+)
+
+type Client struct {
+	client    goetcd.Client
+	keysAPI   goetcd.KeysAPI
+	waitIndex uint64
+}
+
+func New(machines []string) (*Client, error) {
+	newClient, err := goetcd.New(goetcd.Config{
+		Endpoints: machines,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("creating new etcd client for crypt.backend.Client: %v", err)
+	}
+	keysAPI := goetcd.NewKeysAPI(newClient)
+	return &Client{client: newClient, keysAPI: keysAPI, waitIndex: 0}, nil
+}
+
+func (c *Client) Get(key string) ([]byte, error) {
+	return c.GetWithContext(context.TODO(), key)
+}
+
+func (c *Client) GetWithContext(ctx context.Context, key string) ([]byte, error) {
+	resp, err := c.keysAPI.Get(ctx, key, nil)
+	if err != nil {
+		return nil, err
+	}
+	return []byte(resp.Node.Value), nil
+}
+
+func addKVPairs(node *goetcd.Node, list backend.KVPairs) backend.KVPairs {
+	if node.Dir {
+		for _, n := range node.Nodes {
+			list = addKVPairs(n, list)
+		}
+		return list
+	}
+	return append(list, &backend.KVPair{Key: node.Key, Value: []byte(node.Value)})
+}
+
+func (c *Client) List(key string) (backend.KVPairs, error) {
+	return c.ListWithContext(context.TODO(), key)
+}
+
+func (c *Client) ListWithContext(ctx context.Context, key string) (backend.KVPairs, error) {
+	resp, err := c.keysAPI.Get(ctx, key, nil)
+	if err != nil {
+		return nil, err
+	}
+	if !resp.Node.Dir {
+		return nil, errors.New("key is not a directory")
+	}
+	list := addKVPairs(resp.Node, nil)
+	return list, nil
+}
+
+func (c *Client) Set(key string, value []byte) error {
+	return c.SetWithContext(context.TODO(), key, value)
+}
+
+func (c *Client) SetWithContext(ctx context.Context, key string, value []byte) error {
+	_, err := c.keysAPI.Set(ctx, key, string(value), nil)
+	return err
+}
+
+func (c *Client) Watch(key string, stop chan bool) <-chan *backend.Response {
+	return c.WatchWithContext(context.Background(), key, stop)
+}
+
+func (c *Client) WatchWithContext(ctx context.Context, key string, stop chan bool) <-chan *backend.Response {
+	respChan := make(chan *backend.Response, 0)
+	go func() {
+		watcher := c.keysAPI.Watcher(key, nil)
+		ctx, cancel := context.WithCancel(ctx)
+		go func() {
+			<-stop
+			cancel()
+		}()
+		for {
+			var resp *goetcd.Response
+			var err error
+			// if c.waitIndex == 0 {
+			// 	resp, err = c.client.Get(key, false, false)
+			// 	if err != nil {
+			// 		respChan <- &backend.Response{nil, err}
+			// 		time.Sleep(time.Second * 5)
+			// 		continue
+			// 	}
+			// 	c.waitIndex = resp.EtcdIndex
+			// 	respChan <- &backend.Response{[]byte(resp.Node.Value), nil}
+			// }
+			// resp, err = c.client.Watch(key, c.waitIndex+1, false, nil, stop)
+			resp, err = watcher.Next(ctx)
+			if err != nil {
+				respChan <- &backend.Response{nil, err}
+				time.Sleep(time.Second * 5)
+				continue
+			}
+			c.waitIndex = resp.Node.ModifiedIndex
+			respChan <- &backend.Response{[]byte(resp.Node.Value), nil}
+		}
+	}()
+	return respChan
+}