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73 lines
1.5 KiB
73 lines
1.5 KiB
package core_client
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import (
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"github.com/tendermint/tendermint/Godeps/_workspace/src/github.com/gorilla/websocket"
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rpctypes "github.com/tendermint/tendermint/rpc/types"
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"net/http"
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)
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// A websocket client subscribes and unsubscribes to events
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type WSClient struct {
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host string
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conn *websocket.Conn
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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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return &WSClient{
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host: addr,
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}
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}
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func (wsc *WSClient) Dial() (*http.Response, error) {
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dialer := websocket.DefaultDialer
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rHeader := http.Header{}
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conn, r, err := dialer.Dial(wsc.host, rHeader)
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if err != nil {
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return r, err
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}
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wsc.conn = conn
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return r, nil
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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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return wsc.conn.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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}
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// unsubscribe from an event
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func (wsc *WSClient) Unsubscribe(eventid string) error {
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return wsc.conn.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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}
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type WSMsg struct {
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Data []byte
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Error error
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}
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// returns a channel from which messages can be pulled
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// from a go routine that reads the socket.
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// if the ws returns an error (eg. closes), we return
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func (wsc *WSClient) Read() chan *WSMsg {
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ch := make(chan *WSMsg)
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go func() {
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for {
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_, p, err := wsc.conn.ReadMessage()
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ch <- &WSMsg{p, err}
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if err != nil {
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return
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}
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}
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}()
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return ch
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}
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