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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
}
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