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172 lines
4.3 KiB
172 lines
4.3 KiB
package rpcclient
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import (
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"encoding/json"
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"net"
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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/pkg/errors"
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cmn "github.com/tendermint/go-common"
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types "github.com/tendermint/go-rpc/types"
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wire "github.com/tendermint/go-wire"
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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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cmn.BaseService
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Address string // IP:PORT or /path/to/socket
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Endpoint string // /websocket/url/endpoint
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Dialer func(string, string) (net.Conn, error)
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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(remoteAddr, endpoint string) *WSClient {
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addr, dialer := makeHTTPDialer(remoteAddr)
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wsClient := &WSClient{
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Address: addr,
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Dialer: dialer,
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Endpoint: endpoint,
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Conn: nil,
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}
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wsClient.BaseService = *cmn.NewBaseService(log, "WSClient", wsClient)
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return wsClient
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}
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func (wsc *WSClient) String() string {
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return wsc.Address + ", " + wsc.Endpoint
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}
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// OnStart implements cmn.BaseService interface
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func (wsc *WSClient) OnStart() error {
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wsc.BaseService.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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wsc.ResultsCh = make(chan json.RawMessage, wsResultsChannelCapacity)
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wsc.ErrorsCh = make(chan error, wsErrorsChannelCapacity)
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go wsc.receiveEventsRoutine()
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return nil
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}
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// OnReset implements cmn.BaseService interface
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func (wsc *WSClient) OnReset() error {
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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.Dialer{
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NetDial: wsc.Dialer,
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Proxy: http.ProxyFromEnvironment,
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}
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rHeader := http.Header{}
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con, _, err := dialer.Dial("ws://"+wsc.Address+wsc.Endpoint, 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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// OnStop implements cmn.BaseService interface
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func (wsc *WSClient) OnStop() {
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wsc.BaseService.OnStop()
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wsc.Conn.Close()
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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 types.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 <- errors.Errorf(response.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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// this must be modified in the same go-routine that reads from the
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// connection to avoid race conditions
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wsc.Conn = nil
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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. Note the server must have a "subscribe" route
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// defined.
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func (wsc *WSClient) Subscribe(eventid string) error {
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err := wsc.WriteJSON(types.RPCRequest{
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JSONRPC: "2.0",
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ID: "",
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Method: "subscribe",
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Params: map[string]interface{}{"event": eventid},
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})
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return err
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}
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// Unsubscribe from an event. Note the server must have a "unsubscribe" route
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// defined.
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func (wsc *WSClient) Unsubscribe(eventid string) error {
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err := wsc.WriteJSON(types.RPCRequest{
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JSONRPC: "2.0",
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ID: "",
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Method: "unsubscribe",
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Params: map[string]interface{}{"event": eventid},
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})
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return err
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}
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// Call asynchronously calls a given method by sending an RPCRequest to the
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// server. Results will be available on ResultsCh, errors, if any, on ErrorsCh.
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func (wsc *WSClient) Call(method string, params map[string]interface{}) error {
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// we need this step because we attempt to decode values using `go-wire`
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// (handlers.go:470) on the server side
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encodedParams := make(map[string]interface{})
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for k, v := range params {
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bytes := json.RawMessage(wire.JSONBytes(v))
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encodedParams[k] = &bytes
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}
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err := wsc.WriteJSON(types.RPCRequest{
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JSONRPC: "2.0",
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Method: method,
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Params: encodedParams,
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ID: "",
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})
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return err
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}
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