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// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package model
import (
"encoding/json"
"github.com/gorilla/websocket"
)
const (
SOCKET_MAX_MESSAGE_SIZE_KB = 8 * 1024 // 8KB
)
type WebSocketClient struct {
Url string // The location of the server like "ws://localhost:8065"
ApiUrl string // The api location of the server like "ws://localhost:8065/api/v3"
Conn *websocket.Conn // The WebSocket connection
AuthToken string // The token used to open the WebSocket
Sequence int64 // The ever-incrementing sequence attached to each WebSocket action
EventChannel chan *WebSocketEvent
ResponseChannel chan *WebSocketResponse
ListenError *AppError
}
// NewWebSocketClient constructs a new WebSocket client with convienence
// methods for talking to the server.
func NewWebSocketClient(url, authToken string) (*WebSocketClient, *AppError) {
conn, _, err := websocket.DefaultDialer.Dial(url+API_URL_SUFFIX_V3+"/users/websocket", nil)
if err != nil {
return nil, NewLocAppError("NewWebSocketClient", "model.websocket_client.connect_fail.app_error", nil, err.Error())
}
client := &WebSocketClient{
url,
url + API_URL_SUFFIX_V3,
conn,
authToken,
1,
make(chan *WebSocketEvent, 100),
make(chan *WebSocketResponse, 100),
nil,
}
client.SendMessage(WEBSOCKET_AUTHENTICATION_CHALLENGE, map[string]interface{}{"token": authToken})
return client, nil
}
func (wsc *WebSocketClient) Connect() *AppError {
var err error
wsc.Conn, _, err = websocket.DefaultDialer.Dial(wsc.ApiUrl+"/users/websocket", nil)
if err != nil {
return NewLocAppError("NewWebSocketClient", "model.websocket_client.connect_fail.app_error", nil, err.Error())
}
wsc.EventChannel = make(chan *WebSocketEvent, 100)
wsc.ResponseChannel = make(chan *WebSocketResponse, 100)
wsc.SendMessage(WEBSOCKET_AUTHENTICATION_CHALLENGE, map[string]interface{}{"token": wsc.AuthToken})
return nil
}
func (wsc *WebSocketClient) Close() {
wsc.Conn.Close()
}
func (wsc *WebSocketClient) Listen() {
go func() {
defer func() {
wsc.Conn.Close()
close(wsc.EventChannel)
close(wsc.ResponseChannel)
}()
for {
var rawMsg json.RawMessage
var err error
if _, rawMsg, err = wsc.Conn.ReadMessage(); err != nil {
if !websocket.IsCloseError(err, websocket.CloseNormalClosure, websocket.CloseNoStatusReceived) {
wsc.ListenError = NewLocAppError("NewWebSocketClient", "model.websocket_client.connect_fail.app_error", nil, err.Error())
}
return
}
var event WebSocketEvent
if err := json.Unmarshal(rawMsg, &event); err == nil && event.IsValid() {
wsc.EventChannel <- &event
continue
}
var response WebSocketResponse
if err := json.Unmarshal(rawMsg, &response); err == nil && response.IsValid() {
wsc.ResponseChannel <- &response
continue
}
}
}()
}
func (wsc *WebSocketClient) SendMessage(action string, data map[string]interface{}) {
req := &WebSocketRequest{}
req.Seq = wsc.Sequence
req.Action = action
req.Data = data
wsc.Sequence++
wsc.Conn.WriteJSON(req)
}
// UserTyping will push a user_typing event out to all connected users
// who are in the specified channel
func (wsc *WebSocketClient) UserTyping(channelId, parentId string) {
data := map[string]interface{}{
"channel_id": channelId,
"parent_id": parentId,
}
wsc.SendMessage("user_typing", data)
}
// GetStatuses will return a map of string statuses using user id as the key
func (wsc *WebSocketClient) GetStatuses() {
wsc.SendMessage("get_statuses", nil)
}
// GetStatusesByIds will fetch certain user statuses based on ids and return
// a map of string statuses using user id as the key
func (wsc *WebSocketClient) GetStatusesByIds(userIds []string) {
data := map[string]interface{}{
"user_ids": userIds,
}
wsc.SendMessage("get_statuses_by_ids", data)
}
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