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websocket_service.go
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/
websocket_service.go
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/**********************************************************\
| |
| hprose |
| |
| Official WebSite: http://www.hprose.com/ |
| http://www.hprose.org/ |
| |
\**********************************************************/
/**********************************************************\
* *
* rpc/websocket/websocket_service.go *
* *
* hprose websocket service for Go. *
* *
* LastModified: Nov 24, 2016 *
* Author: Ma Bingyao <andot@hprose.com> *
* *
\**********************************************************/
package websocket
import (
"net/http"
"reflect"
"strings"
"sync"
"github.com/gorilla/websocket"
"github.com/hprose/hprose-golang/rpc"
"github.com/hprose/hprose-golang/util"
)
var httpContextType = reflect.TypeOf((*rpc.HTTPContext)(nil))
var httpRequestType = reflect.TypeOf((*http.Request)(nil))
var websocketContextType = reflect.TypeOf((*WebSocketContext)(nil))
var websocketConnType = reflect.TypeOf((*websocket.Conn)(nil))
// WebSocketContext is the hprose websocket context
type WebSocketContext struct {
rpc.HTTPContext
WebSocket *websocket.Conn
}
// WebSocketService is the hprose websocket service
type WebSocketService struct {
rpc.HTTPService
websocket.Upgrader
contextPool sync.Pool
}
func websocketFixArguments(args []reflect.Value, context rpc.ServiceContext) {
i := len(args) - 1
switch args[i].Type() {
case websocketContextType:
if c, ok := context.(*WebSocketContext); ok {
args[i] = reflect.ValueOf(c)
}
case websocketConnType:
if c, ok := context.(*WebSocketContext); ok {
args[i] = reflect.ValueOf(c.WebSocket)
}
case httpContextType:
if c, ok := context.(*WebSocketContext); ok {
args[i] = reflect.ValueOf(&c.HTTPContext)
}
case httpRequestType:
if c, ok := context.(*WebSocketContext); ok {
args[i] = reflect.ValueOf(c.Request)
}
default:
rpc.DefaultFixArguments(args, context)
}
}
// NewWebSocketService is the constructor of WebSocketService
func NewWebSocketService() (service *WebSocketService) {
service = new(WebSocketService)
service.InitHTTPService()
service.contextPool = sync.Pool{
New: func() interface{} { return new(WebSocketContext) },
}
service.FixArguments = websocketFixArguments
service.CheckOrigin = func(request *http.Request) bool {
origin := request.Header.Get("origin")
if origin != "" && origin != "null" {
if len(service.AccessControlAllowOrigins) == 0 ||
service.AccessControlAllowOrigins[origin] {
return true
}
return false
}
return true
}
return
}
func (service *WebSocketService) acquireContext() *WebSocketContext {
return service.contextPool.Get().(*WebSocketContext)
}
func (service *WebSocketService) releaseContext(context *WebSocketContext) {
service.contextPool.Put(context)
}
// ServeHTTP is the hprose http handler method
func (service *WebSocketService) ServeHTTP(
response http.ResponseWriter, request *http.Request) {
if request.Method == "GET" && !strings.Contains(strings.ToLower(request.Header.Get("connection")), "upgrade") || request.Method == "POST" {
service.HTTPService.ServeHTTP(response, request)
return
}
conn, err := service.Upgrade(response, request, nil)
if err != nil {
context := new(rpc.HTTPContext)
context.InitHTTPContext(service, response, request)
resp := service.EndError(err, context)
response.Header().Set("Content-Length", util.Itoa(len(resp)))
response.Write(resp)
return
}
defer conn.Close()
mutex := new(sync.Mutex)
for {
msgType, data, err := conn.ReadMessage()
if err != nil {
break
}
if msgType == websocket.BinaryMessage {
go service.handle(data, mutex, response, request, conn)
}
}
}
func (service *WebSocketService) handle(
data []byte,
mutex *sync.Mutex,
response http.ResponseWriter,
request *http.Request,
conn *websocket.Conn) {
context := service.acquireContext()
context.InitHTTPContext(service, response, request)
context.WebSocket = conn
id := data[0:4]
data = service.Handle(data[4:], context)
mutex.Lock()
writer, err := context.WebSocket.NextWriter(websocket.BinaryMessage)
if err == nil {
_, err = writer.Write(id)
}
if err == nil {
_, err = writer.Write(data)
}
if err == nil {
err = writer.Close()
}
mutex.Unlock()
if err != nil {
rpc.FireErrorEvent(service.Event, err, context)
}
service.releaseContext(context)
}