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06bc6b9 Jan 8, 2017
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package iris
import (
"net/http"
"sync"
"github.com/kataras/go-websocket"
)
// conversionals
const (
// All is the string which the Emmiter use to send a message to all
All = websocket.All
// NotMe is the string which the Emmiter use to send a message to all except this websocket.Connection
NotMe = websocket.NotMe
// Broadcast is the string which the Emmiter use to send a message to all except this websocket.Connection, same as 'NotMe'
Broadcast = websocket.Broadcast
)
// Note I keep this code only to no change the front-end API, we could only use the go-websocket and set our custom upgrader
type (
// WebsocketServer is the iris websocket server, expose the websocket.Server
// the below code is a wrapper and bridge between iris-contrib/websocket and kataras/go-websocket
WebsocketServer struct {
websocket.Server
station *Framework
once sync.Once
// Config:
// if endpoint is not empty then this configuration is used instead of the station's
// useful when the user/dev wants more than one websocket server inside one iris instance.
Config WebsocketConfiguration
}
)
// NewWebsocketServer returns a new empty unitialized websocket server
// it runs on first OnConnection
func NewWebsocketServer(station *Framework) *WebsocketServer {
return &WebsocketServer{station: station, Server: websocket.New()}
}
// NewWebsocketServer creates the client side source route and the route path Endpoint with the correct Handler
// receives the websocket configuration and the iris station
// and returns the websocket server which can be attached to more than one iris station (if needed)
func (ws *WebsocketServer) init() {
if ws.Config.Endpoint == "" {
ws.Config = ws.station.Config.Websocket
}
c := ws.Config
if c.Endpoint == "" {
return
}
// set the routing for client-side source (javascript) (optional)
clientSideLookupName := "iris-websocket-client-side"
ws.station.Get(c.Endpoint, ToHandler(ws.Server.Handler()))
// check if client side already exists
if ws.station.Lookup(clientSideLookupName) == nil {
// serve the client side on domain:port/iris-ws.js
ws.station.StaticContent("/iris-ws.js", contentJavascript, websocket.ClientSource)(clientSideLookupName)
}
if c.CheckOrigin == nil {
c.CheckOrigin = DefaultWebsocketCheckOrigin
}
if c.Error == nil {
c.Error = DefaultWebsocketError
}
// set the underline websocket server's configuration
ws.Server.Set(websocket.Config{
WriteTimeout: c.WriteTimeout,
PongTimeout: c.PongTimeout,
PingPeriod: c.PingPeriod,
MaxMessageSize: c.MaxMessageSize,
BinaryMessages: c.BinaryMessages,
ReadBufferSize: c.ReadBufferSize,
WriteBufferSize: c.WriteBufferSize,
Error: func(w http.ResponseWriter, r *http.Request, status int, reason error) {
ctx := ws.station.AcquireCtx(w, r)
c.Error(ctx, status, reason)
ws.station.ReleaseCtx(ctx)
},
CheckOrigin: c.CheckOrigin,
IDGenerator: c.IDGenerator,
})
}
// WebsocketConnection is the front-end API that you will use to communicate with the client side
type WebsocketConnection interface {
websocket.Connection
}
// OnConnection this is the main event you, as developer, will work with each of the websocket connections
func (ws *WebsocketServer) OnConnection(connectionListener func(WebsocketConnection)) {
ws.once.Do(ws.init)
ws.Server.OnConnection(func(c websocket.Connection) {
connectionListener(c)
})
}