func (r *clientRPC) Get(conn io.Writer, req *clientRequest) {
var res api.Response
kv, err := r.s.Get(req.Key)
if err != nil {
setError(&res, err)
api.Encode(&res, conn)
return
}
res.KV = libkvToKV(kv)
api.Encode(&res, conn)
}
// ProxyRequest is a helper function to proxy an rpc request to another node
func (l *StreamLayer) ProxyRequest(addr string, msg *Request, from io.ReadWriter) error {
conn, err := l.DialWithRetry(addr, time.Duration(retryTimeout)*time.Second, true)
if err != nil {
return err
}
defer conn.Close()
if err := api.Encode(msg, conn); err != nil {
return err
}
chErr := make(chan error, 2)
go func() {
_, err := io.Copy(from, conn)
chErr <- err
}()
go func() {
_, err := io.Copy(conn, from)
chErr <- err
}()
if err := <-chErr; err != nil {
return err
}
return <-chErr
}
func (r *nodeRPC) handleConn(conn net.Conn) {
defer conn.Close()
var req rpc.Request
if err := api.Decode(&req, conn); err != nil {
logrus.Errorf("error handling K/V RPC connection: %v", err)
return
}
logrus.Debugf("Got: %s(%s)", req.Method, req.Args)
var h rpcHandlerFunc
switch req.Method {
case addNode:
h = r.addNode
case removeNode:
h = r.removeNode
}
if !r.r.IsLeader() {
r.ProxyRequest(r.r.GetLeader(), &req, conn)
return
}
var res rpc.Response
if err := h(&req); err != nil {
res.Err = err.Error()
}
api.Encode(&res, conn)
}
func (s *store) apply(ax *api.Request) error {
buf := bytes.NewBuffer(nil)
if err := api.Encode(ax, buf); err != nil {
return err
}
return s.r.Apply(buf.Bytes())
}
func (r *clientRPC) Put(conn io.Writer, req *clientRequest) {
var res api.Response
err := r.s.Put(req.Key, req.Value, &libkvstore.WriteOptions{TTL: req.TTL})
if err != nil {
setError(&res, err)
}
api.Encode(res, conn)
}
func (c *Client) stream(req *api.Request) (io.ReadCloser, error) {
conn, err := c.dial()
if err != nil {
return nil, err
}
if err := api.Encode(&req, conn); err != nil {
return nil, err
}
return conn, nil
}
func (r *clientRPC) Watch(conn io.Writer, req *clientRequest) {
chStop := make(chan struct{})
go waitClose(req.body, chStop)
chKv, err := r.s.Watch(req.Key, chStop)
if err != nil {
return
}
for kv := range chKv {
api.Encode(libkvToKV(kv), conn)
}
}
// RPC is a helper function for performing RPC requests between nodes
func (l *StreamLayer) RPC(addr string, msg *Request) (*Response, error) {
conn, err := l.DialWithRetry(addr, time.Duration(retryTimeout)*time.Second, true)
if err != nil {
return nil, err
}
if err := api.Encode(msg, conn); err != nil {
return nil, err
}
var res Response
if err := api.Decode(&res, conn); err != nil {
return nil, err
}
return &res, nil
}
func (r *clientRPC) WatchTree(conn io.Writer, req *clientRequest) {
chStop := make(chan struct{})
go waitClose(req.body, chStop)
chKv, err := r.s.WatchTree(req.Key, chStop)
if err != nil {
return
}
var apiKVList []*api.KVPair
for kvList := range chKv {
for _, kv := range kvList {
apiKVList = append(apiKVList, libkvToKV(kv))
}
api.Encode(apiKVList, conn)
apiKVList = nil
}
}
func (c *Client) do(req *api.Request) (*api.Response, error) {
conn, err := c.dial()
if err != nil {
return nil, err
}
defer conn.Close()
if err := api.Encode(&req, conn); err != nil {
return nil, err
}
var res api.Response
if err := api.Decode(&res, conn); err != nil {
return nil, fmt.Errorf("error decoding response: %v", err)
}
if res.Err != nil {
return nil, getErr(res.Err)
}
return &res, nil
}
func (s *storeFSM) Persist(sink raft.SnapshotSink) error {
defer sink.Close()
s.mu.Lock()
defer s.mu.Unlock()
return api.Encode(s.data, sink)
}