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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,166 @@ | ||
| package zookeeper | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| zk "github.com/samuel/go-zookeeper/zk" | ||
| "github.com/xordataexchange/crypt/backend" | ||
| "strings" | ||
| "time" | ||
| ) | ||
|
|
||
| type Client struct { | ||
| client *zk.Conn | ||
| waitIndex uint64 | ||
| } | ||
|
|
||
| func New(machines []string) (*Client, error) { | ||
| zkclient, _, err := zk.Connect(machines, time.Second) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &Client{zkclient, 0}, nil | ||
| } | ||
|
|
||
| func (c *Client) Get(key string) ([]byte, error) { | ||
| resp, _, err := c.client.Get(key) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return []byte(resp), nil | ||
| } | ||
|
|
||
| func nodeWalk(prefix string, c *Client, vars map[string]string) error { | ||
| l, stat, err := c.client.Children(prefix) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if stat.NumChildren == 0 { | ||
| b, _, err := c.client.Get(prefix) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| vars[prefix] = string(b) | ||
|
|
||
| } else { | ||
| for _, key := range l { | ||
| s := prefix + "/" + key | ||
| _, stat, err := c.client.Exists(s) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if stat.NumChildren == 0 { | ||
| b, _, err := c.client.Get(s) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| vars[s] = string(b) | ||
| } else { | ||
| nodeWalk(s, c, vars) | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (c *Client) GetValues(key string, keys []string) (map[string]string, error) { | ||
| vars := make(map[string]string) | ||
| for _, v := range keys { | ||
| v = fmt.Sprintf("%s/%s", key, v) | ||
| v = strings.Replace(v, "/*", "", -1) | ||
| _, _, err := c.client.Exists(v) | ||
| if err != nil { | ||
| return vars, err | ||
| } | ||
| if v == "/" { | ||
| v = "" | ||
| } | ||
| err = nodeWalk(v, c, vars) | ||
| if err != nil { | ||
| return vars, err | ||
| } | ||
| } | ||
| return vars, nil | ||
| } | ||
|
|
||
| func (c *Client) List(key string) (backend.KVPairs, error) { | ||
| var list backend.KVPairs | ||
| resp, stat, err := c.client.Children(key) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| if stat.NumChildren == 0 { | ||
| return list, nil | ||
| } | ||
|
|
||
| entries, err := c.GetValues(key, resp) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| for k, v := range entries { | ||
| list = append(list, &backend.KVPair{Key: k, Value: []byte(v)}) | ||
| } | ||
| return list, nil | ||
| } | ||
|
|
||
| func (c *Client) createParents(key string) error { | ||
| flags := int32(0) | ||
| acl := zk.WorldACL(zk.PermAll) | ||
|
|
||
| if key[0] != '/' { | ||
| return errors.New("Invalid path") | ||
| } | ||
|
|
||
| payload := []byte("") | ||
| pathString := "" | ||
| pathNodes := strings.Split(key, "/") | ||
| for i := 1; i < len(pathNodes); i++ { | ||
| pathString += "/" + pathNodes[i] | ||
| _, err := c.client.Create(pathString, payload, flags, acl) | ||
| // not being able to create the node because it exists or not having | ||
| // sufficient rights is not an issue. It is ok for the node to already | ||
| // exist and/or us to only have read rights | ||
| if err != nil && err != zk.ErrNodeExists && err != zk.ErrNoAuth { | ||
| return err | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (c *Client) Set(key string, value []byte) error { | ||
| err := c.createParents(key) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| _, err = c.client.Set(key, []byte(value), -1) | ||
| return err | ||
| } | ||
|
|
||
| func (c *Client) Watch(key string, stop chan bool) <-chan *backend.Response { | ||
| respChan := make(chan *backend.Response, 0) | ||
| go func() { | ||
| for { | ||
| resp, _, watch, err := c.client.GetW(key) | ||
| if err != nil { | ||
| respChan <- &backend.Response{nil, err} | ||
| time.Sleep(time.Second * 5) | ||
| } | ||
|
|
||
| select { | ||
| case e := <-watch: | ||
| if e.Type == zk.EventNodeDataChanged { | ||
| resp, _, err = c.client.Get(key) | ||
| if err != nil { | ||
| respChan <- &backend.Response{nil, err} | ||
| } | ||
| c.waitIndex = 0 | ||
| respChan <- &backend.Response{[]byte(resp), nil} | ||
| } | ||
| } | ||
| } | ||
| }() | ||
| return respChan | ||
| } |
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