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main.go
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main.go
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// Copyright 2019, Shulhan <ms@kilabit.info>. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Program server provide an example of WebSocket server as group chat.
// The client that connect to the server must be authenticated using key.
package main
import (
"context"
"fmt"
"log"
"net/http"
"time"
"github.com/shuLhan/share/lib/websocket"
"github.com/shuLhan/share/lib/websocket/examples"
)
var server *websocket.Server
func main() {
var (
opts = &websocket.ServerOptions{
Address: `:9101`,
// Register the authentication handler.
HandleAuth: handleAuth,
HandleClientAdd: handleClientAdd,
HandleClientRemove: handleClientRemove,
}
err error
)
server = websocket.NewServer(opts)
// Register the message handler.
err = server.RegisterTextHandler(http.MethodPost, "/message", handlePostMessage)
if err != nil {
log.Fatal(err)
}
log.Println("server: starting ...")
err = server.Start()
if err != nil {
log.Fatal(err)
}
}
// handleAuth authenticated the new connection by checking the Header "Key"
// value.
func handleAuth(req *websocket.Handshake) (ctx context.Context, err error) {
var (
key = req.Header.Get(`Key`)
id int64
user *examples.Account
)
for id, user = range examples.Users {
if user.Key == key {
ctx = context.WithValue(context.Background(),
websocket.CtxKeyUID, id)
return ctx, nil
}
}
return nil, fmt.Errorf("user's key not found")
}
// handleClientAdd do something when new connection accepted by server.
func handleClientAdd(ctx context.Context, conn int) {
log.Printf("server: adding client %d ...", conn)
var (
uid = ctx.Value(websocket.CtxKeyUID).(int64)
user = examples.Users[uid]
body string
packet []byte
err error
c int
)
// Broadcast to other connections that new user is connected.
body = user.Name + " joining conversation..."
packet, err = websocket.NewBroadcast(examples.BroadcastSystem, body)
if err != nil {
log.Fatal(err)
}
for _, c = range server.Clients.All() {
if c == conn {
continue
}
err = websocket.Send(c, packet, 1*time.Second)
if err != nil {
log.Println(err)
}
}
}
// handleClientRemove do something when connection removed by server, either
// by client disconnected or manually removed by server itself.
func handleClientRemove(ctx context.Context, conn int) {
log.Printf("server: client %d has been disconnected ...", conn)
var (
uid = ctx.Value(websocket.CtxKeyUID).(int64)
user = examples.Users[uid]
body string
packet []byte
err error
c int
)
// Broadcast to other connections that user is disconnected.
body = user.Name + " leaving conversation..."
packet, err = websocket.NewBroadcast(examples.BroadcastSystem, body)
if err != nil {
log.Fatal(err)
}
for _, c = range server.Clients.All() {
if c == conn {
continue
}
err = websocket.Send(c, packet, 1*time.Second)
if err != nil {
log.Println(err)
}
}
}
// handlePostMessage handle message that is send to server by client.
func handlePostMessage(ctx context.Context, req *websocket.Request) (res websocket.Response) {
var (
uid = ctx.Value(websocket.CtxKeyUID).(int64)
user = examples.Users[uid]
body = user.Name + `: ` + req.Body
packet []byte
err error
conn int
)
packet, err = websocket.NewBroadcast(examples.BroadcastMessage, body)
if err != nil {
res.Code = http.StatusInternalServerError
res.Body = err.Error()
return res
}
// Broadcast the message to all connected clients, including our
// connections. Remember, that user could connected through many
// application.
for _, conn = range server.Clients.All() {
if conn == req.Conn {
continue
}
err = websocket.Send(conn, packet, 1*time.Second)
if err != nil {
log.Println(err)
}
}
// Set the response status to success.
res.Code = http.StatusOK
return res
}