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125 lines
2.8 KiB
125 lines
2.8 KiB
package rpcclient
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"time"
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"github.com/gorilla/websocket"
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. "github.com/tendermint/go-common"
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"github.com/tendermint/go-rpc/types"
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)
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const (
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wsResultsChannelCapacity = 10
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wsErrorsChannelCapacity = 1
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wsWriteTimeoutSeconds = 10
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)
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type WSClient struct {
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QuitService
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Address string
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*websocket.Conn
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ResultsCh chan json.RawMessage // closes upon WSClient.Stop()
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ErrorsCh chan error // closes upon WSClient.Stop()
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}
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// create a new connection
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func NewWSClient(addr string) *WSClient {
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wsClient := &WSClient{
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Address: addr,
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Conn: nil,
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ResultsCh: make(chan json.RawMessage, wsResultsChannelCapacity),
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ErrorsCh: make(chan error, wsErrorsChannelCapacity),
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}
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wsClient.QuitService = *NewQuitService(log, "WSClient", wsClient)
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return wsClient
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}
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func (wsc *WSClient) OnStart() error {
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wsc.QuitService.OnStart()
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err := wsc.dial()
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if err != nil {
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return err
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}
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go wsc.receiveEventsRoutine()
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return nil
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}
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func (wsc *WSClient) dial() error {
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// Dial
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dialer := websocket.DefaultDialer
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rHeader := http.Header{}
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con, _, err := dialer.Dial(wsc.Address, rHeader)
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if err != nil {
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return err
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}
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// Set the ping/pong handlers
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con.SetPingHandler(func(m string) error {
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// NOTE: https://github.com/gorilla/websocket/issues/97
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go con.WriteControl(websocket.PongMessage, []byte(m), time.Now().Add(time.Second*wsWriteTimeoutSeconds))
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return nil
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})
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con.SetPongHandler(func(m string) error {
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// NOTE: https://github.com/gorilla/websocket/issues/97
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return nil
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})
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wsc.Conn = con
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return nil
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}
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func (wsc *WSClient) OnStop() {
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wsc.QuitService.OnStop()
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// ResultsCh/ErrorsCh is closed in receiveEventsRoutine.
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}
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func (wsc *WSClient) receiveEventsRoutine() {
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for {
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_, data, err := wsc.ReadMessage()
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if err != nil {
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log.Info("WSClient failed to read message", "error", err, "data", string(data))
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wsc.Stop()
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break
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} else {
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var response rpctypes.RPCResponse
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err := json.Unmarshal(data, &response)
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if err != nil {
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log.Info("WSClient failed to parse message", "error", err, "data", string(data))
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wsc.ErrorsCh <- err
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continue
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}
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if response.Error != "" {
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wsc.ErrorsCh <- fmt.Errorf(err.Error())
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continue
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}
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wsc.ResultsCh <- *response.Result
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}
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}
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// Cleanup
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close(wsc.ResultsCh)
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close(wsc.ErrorsCh)
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}
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// subscribe to an event
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func (wsc *WSClient) Subscribe(eventid string) error {
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err := wsc.WriteJSON(rpctypes.RPCRequest{
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JSONRPC: "2.0",
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ID: "",
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Method: "subscribe",
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Params: []interface{}{eventid},
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})
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return err
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}
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// unsubscribe from an event
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func (wsc *WSClient) Unsubscribe(eventid string) error {
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err := wsc.WriteJSON(rpctypes.RPCRequest{
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JSONRPC: "2.0",
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ID: "",
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Method: "unsubscribe",
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Params: []interface{}{eventid},
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})
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return err
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}
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