project initialized

socket/web/client/connector.go

@@ -0,0 +1,534 @@
+package client
+
+import (
+	"bufio"
+	"bytes"
+	"crypto/tls"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"net/url"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	olog "git.loafle.net/overflow/log-go"
+	"git.loafle.net/overflow/server-go/socket"
+	"git.loafle.net/overflow/server-go/socket/client"
+	"git.loafle.net/overflow/server-go/socket/web"
+)
+
+var errMalformedURL = errors.New("malformed ws or wss URL")
+
+type Connectors struct {
+	client.Connectors
+
+	URL string `json:"url,omitempty"`
+
+	RequestHeader func() http.Header `json:"-"`
+
+	Subprotocols []string `json:"subprotocols,omitempty"`
+	// Jar specifies the cookie jar.
+	// If Jar is nil, cookies are not sent in requests and ignored
+	// in responses.
+	CookieJar http.CookieJar `json:"-"`
+
+	ResponseHandler func(*http.Response) `json:"-"`
+
+	// NetDial specifies the dial function for creating TCP connections. If
+	// NetDial is nil, net.Dial is used.
+	NetDial func(network, addr string) (net.Conn, error) `json:"-"`
+
+	// Proxy specifies a function to return a proxy for a given
+	// Request. If the function returns a non-nil error, the
+	// request is aborted with the provided error.
+	// If Proxy is nil or returns a nil *URL, no proxy is used.
+	Proxy func(*http.Request) (*url.URL, error) `json:"-"`
+
+	serverURL *url.URL
+
+	stopChan chan struct{}
+	stopWg   sync.WaitGroup
+
+	readChan  chan socket.SocketMessage
+	writeChan chan socket.SocketMessage
+
+	disconnectedChan chan struct{}
+	reconnectedChan  chan socket.Conn
+
+	crw socket.ClientReadWriter
+
+	validated atomic.Value
+}
+
+func (c *Connectors) Connect() (readChan <-chan socket.SocketMessage, writeChan chan<- socket.SocketMessage, err error) {
+	var (
+		conn socket.Conn
+		res  *http.Response
+	)
+
+	if c.stopChan != nil {
+		return nil, nil, fmt.Errorf("%s already connected", c.logHeader())
+	}
+
+	conn, res, err = c.connect()
+	if nil != err {
+		return nil, nil, err
+	}
+	resH := c.ResponseHandler
+	if nil != resH {
+		resH(res)
+	}
+
+	c.readChan = make(chan socket.SocketMessage, 256)
+	c.writeChan = make(chan socket.SocketMessage, 256)
+	c.disconnectedChan = make(chan struct{})
+	c.reconnectedChan = make(chan socket.Conn)
+	c.stopChan = make(chan struct{})
+
+	c.crw.ReadwriteHandler = c
+	c.crw.ReadChan = c.readChan
+	c.crw.WriteChan = c.writeChan
+	c.crw.ClientStopChan = c.stopChan
+	c.crw.ClientStopWg = &c.stopWg
+	c.crw.DisconnectedChan = c.disconnectedChan
+	c.crw.ReconnectedChan = c.reconnectedChan
+
+	c.stopWg.Add(1)
+	go c.handleReconnect()
+	c.stopWg.Add(1)
+	go c.crw.HandleConnection(conn)
+
+	return c.readChan, c.writeChan, nil
+}
+
+func (c *Connectors) Disconnect() error {
+	if c.stopChan == nil {
+		return fmt.Errorf("%s must be connected before disconnection it", c.logHeader())
+	}
+	close(c.stopChan)
+	c.stopWg.Wait()
+
+	c.stopChan = nil
+
+	return nil
+}
+
+func (c *Connectors) logHeader() string {
+	return fmt.Sprintf("Connector[%s]:", c.Name)
+}
+
+func (c *Connectors) onDisconnected() {
+	close(c.readChan)
+	close(c.writeChan)
+
+	c.reconnectedChan <- nil
+
+	onDisconnected := c.OnDisconnected
+	if nil != onDisconnected {
+		go func() {
+			onDisconnected(c)
+		}()
+	}
+}
+
+func (c *Connectors) handleReconnect() {
+	defer func() {
+		c.stopWg.Done()
+	}()
+
+RC_LOOP:
+	for {
+		select {
+		case <-c.disconnectedChan:
+		case <-c.stopChan:
+			return
+		}
+
+		if 0 >= c.GetReconnectTryTime() {
+			c.onDisconnected()
+			return
+		}
+
+		olog.Logger().Debugf("%s connection lost", c.logHeader())
+
+		for indexI := 0; indexI < c.GetReconnectTryTime(); indexI++ {
+			olog.Logger().Debugf("%s trying reconnect[%d]", c.logHeader(), indexI)
+
+			conn, res, err := c.connect()
+			if nil == err {
+				resH := c.ResponseHandler
+				if nil != resH {
+					resH(res)
+				}
+
+				olog.Logger().Debugf("%s reconnected", c.logHeader())
+				c.reconnectedChan <- conn
+				continue RC_LOOP
+			}
+			time.Sleep(c.GetReconnectInterval())
+		}
+		olog.Logger().Debugf("%s reconnecting has been failed", c.logHeader())
+
+		c.onDisconnected()
+		return
+	}
+}
+
+func (c *Connectors) connect() (socket.Conn, *http.Response, error) {
+	conn, res, err := c.dial()
+	if nil != err {
+		return nil, nil, err
+	}
+
+	conn.SetCloseHandler(func(code int, text string) error {
+		olog.Logger().Debugf("%s close", c.logHeader())
+		return nil
+	})
+	return conn, res, nil
+}
+
+func (c *Connectors) dial() (socket.Conn, *http.Response, error) {
+	var (
+		err          error
+		challengeKey string
+		netConn      net.Conn
+	)
+
+	challengeKey, err = web.GenerateChallengeKey()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	req := &http.Request{
+		Method:     "GET",
+		URL:        c.serverURL,
+		Proto:      "HTTP/1.1",
+		ProtoMajor: 1,
+		ProtoMinor: 1,
+		Header:     make(http.Header),
+		Host:       c.serverURL.Host,
+	}
+
+	cookieJar := c.CookieJar
+	// Set the cookies present in the cookie jar of the dialer
+	if nil != cookieJar {
+		for _, cookie := range cookieJar.Cookies(c.serverURL) {
+			req.AddCookie(cookie)
+		}
+	}
+
+	// Set the request headers using the capitalization for names and values in
+	// RFC examples. Although the capitalization shouldn't matter, there are
+	// servers that depend on it. The Header.Set method is not used because the
+	// method canonicalizes the header names.
+	req.Header["Upgrade"] = []string{"websocket"}
+	req.Header["Connection"] = []string{"Upgrade"}
+	req.Header["Sec-WebSocket-Key"] = []string{challengeKey}
+	req.Header["Sec-WebSocket-Version"] = []string{"13"}
+
+	subprotocols := c.Subprotocols
+
+	if len(subprotocols) > 0 {
+		req.Header["Sec-WebSocket-Protocol"] = []string{strings.Join(subprotocols, ", ")}
+	}
+
+	for k, vs := range c.RequestHeader() {
+		switch {
+		case k == "Host":
+			if len(vs) > 0 {
+				req.Host = vs[0]
+			}
+		case k == "Upgrade" ||
+			k == "Connection" ||
+			k == "Sec-Websocket-Key" ||
+			k == "Sec-Websocket-Version" ||
+			k == "Sec-Websocket-Extensions" ||
+			(k == "Sec-Websocket-Protocol" && len(subprotocols) > 0):
+			return nil, nil, fmt.Errorf("%s duplicate header not allowed: %s", c.logHeader(), k)
+		default:
+			req.Header[k] = vs
+		}
+	}
+
+	if c.IsEnableCompression() {
+		req.Header.Set("Sec-Websocket-Extensions", "permessage-deflate; server_no_context_takeover; client_no_context_takeover")
+	}
+
+	hostPort, hostNoPort := hostPortNoPort(c.serverURL)
+
+	var proxyURL *url.URL
+	// Check wether the proxy method has been configured
+	proxy := c.Proxy
+	if nil != proxy {
+		proxyURL, err = proxy(req)
+		if err != nil {
+			return nil, nil, err
+		}
+	}
+
+	var targetHostPort string
+	if proxyURL != nil {
+		targetHostPort, _ = hostPortNoPort(proxyURL)
+	} else {
+		targetHostPort = hostPort
+	}
+
+	var deadline time.Time
+	handshakeTimeout := c.GetHandshakeTimeout()
+	if 0 != handshakeTimeout {
+		deadline = time.Now().Add(handshakeTimeout)
+	}
+
+	netDial := c.NetDial
+	if netDial == nil {
+		netDialer := &net.Dialer{Deadline: deadline}
+		netDial = netDialer.Dial
+	}
+
+	netConn, err = netDial("tcp", targetHostPort)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	defer func() {
+		if nil != netConn {
+			netConn.Close()
+		}
+	}()
+
+	err = netConn.SetDeadline(deadline)
+	if nil != err {
+		return nil, nil, err
+	}
+
+	if nil != proxyURL {
+		connectHeader := make(http.Header)
+		if user := proxyURL.User; nil != user {
+			proxyUser := user.Username()
+			if proxyPassword, passwordSet := user.Password(); passwordSet {
+				credential := base64.StdEncoding.EncodeToString([]byte(proxyUser + ":" + proxyPassword))
+				connectHeader.Set("Proxy-Authorization", "Basic "+credential)
+			}
+		}
+		connectReq := &http.Request{
+			Method: "CONNECT",
+			URL:    &url.URL{Opaque: hostPort},
+			Host:   hostPort,
+			Header: connectHeader,
+		}
+
+		connectReq.Write(netConn)
+
+		// Read response.
+		// Okay to use and discard buffered reader here, because
+		// TLS server will not speak until spoken to.
+		br := bufio.NewReader(netConn)
+		resp, err := http.ReadResponse(br, connectReq)
+		if err != nil {
+			return nil, nil, err
+		}
+		if resp.StatusCode != 200 {
+			f := strings.SplitN(resp.Status, " ", 2)
+			return nil, nil, errors.New(f[1])
+		}
+	}
+
+	if "https" == c.serverURL.Scheme {
+		cfg := cloneTLSConfig(c.GetTLSConfig())
+		if cfg.ServerName == "" {
+			cfg.ServerName = hostNoPort
+		}
+		tlsConn := tls.Client(netConn, cfg)
+		netConn = tlsConn
+		if err := tlsConn.Handshake(); err != nil {
+			return nil, nil, err
+		}
+		if !cfg.InsecureSkipVerify {
+			if err := tlsConn.VerifyHostname(cfg.ServerName); err != nil {
+				return nil, nil, err
+			}
+		}
+	}
+
+	conn := socket.NewConn(netConn, false, c.GetReadBufferSize(), c.GetWriteBufferSize())
+
+	if err := req.Write(netConn); err != nil {
+		return nil, nil, err
+	}
+
+	resp, err := http.ReadResponse(conn.BuffReader, req)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	if nil != cookieJar {
+		if rc := resp.Cookies(); len(rc) > 0 {
+			cookieJar.SetCookies(c.serverURL, rc)
+		}
+	}
+
+	if resp.StatusCode != 101 ||
+		!strings.EqualFold(resp.Header.Get("Upgrade"), "websocket") ||
+		!strings.EqualFold(resp.Header.Get("Connection"), "upgrade") ||
+		resp.Header.Get("Sec-Websocket-Accept") != web.ComputeAcceptKey(challengeKey) {
+		// Before closing the network connection on return from this
+		// function, slurp up some of the response to aid application
+		// debugging.
+		buf := make([]byte, 1024)
+		n, _ := io.ReadFull(resp.Body, buf)
+		resp.Body = ioutil.NopCloser(bytes.NewReader(buf[:n]))
+		return nil, resp, socket.ErrBadHandshake
+	}
+
+	for _, ext := range web.HttpParseExtensions(resp.Header) {
+		if ext[""] != "permessage-deflate" {
+			continue
+		}
+		_, snct := ext["server_no_context_takeover"]
+		_, cnct := ext["client_no_context_takeover"]
+		if !snct || !cnct {
+			return nil, resp, socket.ErrInvalidCompression
+		}
+		conn.SetNewCompressionWriter(socket.CompressNoContextTakeover)
+		conn.SetNewDecompressionReader(socket.DecompressNoContextTakeover)
+		break
+	}
+
+	resp.Body = ioutil.NopCloser(bytes.NewReader([]byte{}))
+	conn.SetSubprotocol(resp.Header.Get("Sec-Websocket-Protocol"))
+
+	netConn.SetDeadline(time.Time{})
+	netConn = nil // to avoid close in defer.
+
+	return conn, resp, nil
+}
+
+// parseURL parses the URL.
+//
+// This function is a replacement for the standard library url.Parse function.
+// In Go 1.4 and earlier, url.Parse loses information from the path.
+func parseURL(s string) (*url.URL, error) {
+	// From the RFC:
+	//
+	// ws-URI = "ws:" "//" host [ ":" port ] path [ "?" query ]
+	// wss-URI = "wss:" "//" host [ ":" port ] path [ "?" query ]
+	var u url.URL
+	switch {
+	case strings.HasPrefix(s, "ws://"):
+		u.Scheme = "ws"
+		s = s[len("ws://"):]
+	case strings.HasPrefix(s, "wss://"):
+		u.Scheme = "wss"
+		s = s[len("wss://"):]
+	default:
+		return nil, errMalformedURL
+	}
+
+	if i := strings.Index(s, "?"); i >= 0 {
+		u.RawQuery = s[i+1:]
+		s = s[:i]
+	}
+
+	if i := strings.Index(s, "/"); i >= 0 {
+		u.Opaque = s[i:]
+		s = s[:i]
+	} else {
+		u.Opaque = "/"
+	}
+
+	u.Host = s
+
+	if strings.Contains(u.Host, "@") {
+		// Don't bother parsing user information because user information is
+		// not allowed in websocket URIs.
+		return nil, errMalformedURL
+	}
+
+	return &u, nil
+}
+
+func hostPortNoPort(u *url.URL) (hostPort, hostNoPort string) {
+	hostPort = u.Host
+	hostNoPort = u.Host
+	if i := strings.LastIndex(u.Host, ":"); i > strings.LastIndex(u.Host, "]") {
+		hostNoPort = hostNoPort[:i]
+	} else {
+		switch u.Scheme {
+		case "wss":
+			hostPort += ":443"
+		case "https":
+			hostPort += ":443"
+		default:
+			hostPort += ":80"
+		}
+	}
+	return hostPort, hostNoPort
+}
+
+func cloneTLSConfig(cfg *tls.Config) *tls.Config {
+	if cfg == nil {
+		return &tls.Config{}
+	}
+	return cfg.Clone()
+}
+
+func (c *Connectors) Clone() client.Connector {
+	return &Connectors{
+		Connectors:      *c.Connectors.Clone(),
+		URL:             c.URL,
+		RequestHeader:   c.RequestHeader,
+		Subprotocols:    c.Subprotocols,
+		CookieJar:       c.CookieJar,
+		ResponseHandler: c.ResponseHandler,
+		NetDial:         c.NetDial,
+		Proxy:           c.Proxy,
+		serverURL:       c.serverURL,
+		validated:       c.validated,
+	}
+}
+
+func (c *Connectors) Validate() error {
+	if nil != c.validated.Load() {
+		return nil
+	}
+	c.validated.Store(true)
+
+	if err := c.Connectors.Validate(); nil != err {
+		return err
+	}
+
+	if "" == c.URL {
+		return fmt.Errorf("URL is not valid")
+	}
+
+	u, err := parseURL(c.URL)
+	if nil != err {
+		return err
+	}
+	switch u.Scheme {
+	case "ws":
+		u.Scheme = "http"
+	case "wss":
+		u.Scheme = "https"
+	default:
+		return errMalformedURL
+	}
+	if nil != u.User {
+		// User name and password are not allowed in websocket URIs.
+		return errMalformedURL
+	}
+
+	c.serverURL = u
+
+	if nil == c.Proxy {
+		c.Proxy = http.ProxyFromEnvironment
+	}
+
+	return nil
+}

socket/web/server-handler.go

@@ -0,0 +1,126 @@
+package web
+
+import (
+	"net/http"
+	"sync/atomic"
+
+	"git.loafle.net/overflow/server-go"
+	"git.loafle.net/overflow/server-go/socket"
+
+	"github.com/valyala/fasthttp"
+)
+
+type ServerHandler interface {
+	socket.ServerHandler
+
+	OnError(serverCtx server.ServerCtx, ctx *fasthttp.RequestCtx, status int, reason error)
+
+	RegisterServlet(path string, servlet Servlet)
+	Servlet(serverCtx server.ServerCtx, ctx *fasthttp.RequestCtx) Servlet
+
+	CheckOrigin(ctx *fasthttp.RequestCtx) bool
+}
+
+type ServerHandlers struct {
+	socket.ServerHandlers
+
+	servlets map[string]Servlet
+
+	validated atomic.Value
+}
+
+func (sh *ServerHandlers) Init(serverCtx server.ServerCtx) error {
+	if err := sh.ServerHandlers.Init(serverCtx); nil != err {
+		return err
+	}
+
+	if nil != sh.servlets {
+		for _, servlet := range sh.servlets {
+			if err := servlet.Init(serverCtx); nil != err {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+func (sh *ServerHandlers) OnStart(serverCtx server.ServerCtx) error {
+	if err := sh.ServerHandlers.OnStart(serverCtx); nil != err {
+		return err
+	}
+
+	if nil != sh.servlets {
+		for _, servlet := range sh.servlets {
+			if err := servlet.OnStart(serverCtx); nil != err {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+func (sh *ServerHandlers) OnStop(serverCtx server.ServerCtx) {
+	if nil != sh.servlets {
+		for _, servlet := range sh.servlets {
+			servlet.OnStop(serverCtx)
+		}
+	}
+
+	sh.ServerHandlers.OnStop(serverCtx)
+}
+
+func (sh *ServerHandlers) Destroy(serverCtx server.ServerCtx) {
+	if nil != sh.servlets {
+		for _, servlet := range sh.servlets {
+			servlet.Destroy(serverCtx)
+		}
+	}
+
+	sh.ServerHandlers.Destroy(serverCtx)
+}
+
+func (sh *ServerHandlers) OnError(serverCtx server.ServerCtx, ctx *fasthttp.RequestCtx, status int, reason error) {
+	ctx.Response.Header.Set("Sec-Websocket-Version", "13")
+	ctx.Error(http.StatusText(status), status)
+}
+
+func (sh *ServerHandlers) RegisterServlet(path string, servlet Servlet) {
+	if nil == sh.servlets {
+		sh.servlets = make(map[string]Servlet)
+	}
+	sh.servlets[path] = servlet
+}
+
+func (sh *ServerHandlers) Servlet(serverCtx server.ServerCtx, ctx *fasthttp.RequestCtx) Servlet {
+	path := string(ctx.Path())
+
+	var servlet Servlet
+	if path == "" && len(sh.servlets) == 1 {
+		for _, s := range sh.servlets {
+			servlet = s
+		}
+	} else if servlet = sh.servlets[path]; nil == servlet {
+		return nil
+	}
+
+	return servlet
+}
+
+func (sh *ServerHandlers) CheckOrigin(ctx *fasthttp.RequestCtx) bool {
+	return true
+}
+
+func (sh *ServerHandlers) Validate() error {
+	if nil != sh.validated.Load() {
+		return nil
+	}
+	sh.validated.Store(true)
+
+	if err := sh.ServerHandlers.Validate(); nil != err {
+		return err
+	}
+
+	return nil
+}

socket/web/server.go

@@ -0,0 +1,197 @@
+package web
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"net/http"
+	"sync"
+	"sync/atomic"
+
+	olog "git.loafle.net/overflow/log-go"
+	"git.loafle.net/overflow/server-go"
+	"git.loafle.net/overflow/server-go/socket"
+	"github.com/valyala/fasthttp"
+)
+
+type Server struct {
+	ServerHandler ServerHandler
+
+	ctx      server.ServerCtx
+	stopChan chan struct{}
+	stopWg   sync.WaitGroup
+
+	srw socket.ServerReadWriter
+
+	hs       *fasthttp.Server
+	upgrader *Upgrader
+}
+
+func (s *Server) ListenAndServe() error {
+	var (
+		err      error
+		listener net.Listener
+	)
+	if nil == s.ServerHandler {
+		return fmt.Errorf("%s server handler must be specified", s.logHeader())
+	}
+	s.ServerHandler.Validate()
+
+	if s.stopChan != nil {
+		return fmt.Errorf("%s already running. Stop it before starting it again", s.logHeader())
+	}
+
+	s.ctx = s.ServerHandler.ServerCtx()
+	if nil == s.ctx {
+		return fmt.Errorf("%s ServerCtx is nil", s.logHeader())
+	}
+
+	s.hs = &fasthttp.Server{
+		Handler:         s.httpHandler,
+		Name:            s.ServerHandler.GetName(),
+		Concurrency:     s.ServerHandler.GetConcurrency(),
+		ReadBufferSize:  s.ServerHandler.GetReadBufferSize(),
+		WriteBufferSize: s.ServerHandler.GetWriteBufferSize(),
+		ReadTimeout:     s.ServerHandler.GetReadTimeout(),
+		WriteTimeout:    s.ServerHandler.GetWriteTimeout(),
+	}
+
+	s.upgrader = &Upgrader{
+		HandshakeTimeout:  s.ServerHandler.GetHandshakeTimeout(),
+		ReadBufferSize:    s.ServerHandler.GetReadBufferSize(),
+		WriteBufferSize:   s.ServerHandler.GetWriteBufferSize(),
+		CheckOrigin:       s.ServerHandler.(ServerHandler).CheckOrigin,
+		Error:             s.onError,
+		EnableCompression: s.ServerHandler.IsEnableCompression(),
+		CompressionLevel:  s.ServerHandler.GetCompressionLevel(),
+	}
+
+	if err = s.ServerHandler.Init(s.ctx); nil != err {
+		olog.Logger().Errorf("%s Init has been failed %v", s.logHeader(), err)
+		return err
+	}
+
+	if listener, err = s.ServerHandler.Listener(s.ctx); nil != err {
+		return err
+	}
+
+	s.stopChan = make(chan struct{})
+
+	s.srw.ReadwriteHandler = s.ServerHandler
+	s.srw.ServerStopChan = s.stopChan
+	s.srw.ServerStopWg = &s.stopWg
+
+	s.stopWg.Add(1)
+	return s.handleServer(listener)
+}
+
+func (s *Server) Shutdown(ctx context.Context) error {
+	if s.stopChan == nil {
+		return fmt.Errorf("%s must be started before stopping it", s.logHeader())
+	}
+	close(s.stopChan)
+	s.stopWg.Wait()
+
+	s.ServerHandler.Destroy(s.ctx)
+
+	s.stopChan = nil
+
+	return nil
+}
+
+func (s *Server) logHeader() string {
+	return fmt.Sprintf("Server[%s]:", s.ServerHandler.GetName())
+}
+
+func (s *Server) handleServer(listener net.Listener) error {
+	var (
+		err      error
+		stopping atomic.Value
+	)
+
+	defer func() {
+		if nil != listener {
+			listener.Close()
+		}
+		s.ServerHandler.OnStop(s.ctx)
+
+		olog.Logger().Infof("%s Stopped", s.logHeader())
+
+		s.stopWg.Done()
+	}()
+
+	if err = s.ServerHandler.OnStart(s.ctx); nil != err {
+		olog.Logger().Errorf("%s OnStart has been failed %v", s.logHeader(), err)
+		return err
+	}
+
+	hsCloseChan := make(chan error)
+	go func() {
+		if err := s.hs.Serve(listener); nil != err {
+			if nil == stopping.Load() {
+				hsCloseChan <- err
+				return
+			}
+		}
+		hsCloseChan <- nil
+	}()
+
+	olog.Logger().Infof("%s Started", s.logHeader())
+
+	select {
+	case err, _ := <-hsCloseChan:
+		if nil != err {
+			return err
+		}
+	case <-s.stopChan:
+		stopping.Store(true)
+		listener.Close()
+		<-hsCloseChan
+		listener = nil
+	}
+
+	return nil
+}
+
+func (s *Server) httpHandler(ctx *fasthttp.RequestCtx) {
+	var (
+		servlet Servlet
+		err     error
+	)
+
+	if 0 < s.ServerHandler.GetConcurrency() {
+		sz := s.srw.ConnectionSize()
+		if sz >= s.ServerHandler.GetConcurrency() {
+			olog.Logger().Warnf("%s max connections size %d, refuse", s.logHeader(), sz)
+			s.onError(ctx, fasthttp.StatusServiceUnavailable, err)
+			return
+		}
+	}
+
+	if servlet = s.ServerHandler.Servlet(s.ctx, ctx); nil == servlet {
+		s.onError(ctx, fasthttp.StatusInternalServerError, err)
+		return
+	}
+
+	var responseHeader *fasthttp.ResponseHeader
+	servletCtx := servlet.ServletCtx(s.ctx)
+
+	if responseHeader, err = servlet.Handshake(servletCtx, ctx); nil != err {
+		s.onError(ctx, http.StatusNotAcceptable, fmt.Errorf("Handshake err: %v", err))
+		return
+	}
+
+	s.upgrader.Upgrade(ctx, responseHeader, func(conn *socket.SocketConn, err error) {
+		if err != nil {
+			s.onError(ctx, fasthttp.StatusInternalServerError, err)
+			return
+		}
+
+		s.stopWg.Add(1)
+		s.srw.HandleConnection(servlet, servletCtx, conn)
+	})
+}
+
+func (s *Server) onError(ctx *fasthttp.RequestCtx, status int, reason error) {
+	s.ServerHandler.(ServerHandler).OnError(s.ctx, ctx, status, reason)
+}

socket/web/servlet.go

@@ -0,0 +1,53 @@
+package web
+
+import (
+	"git.loafle.net/overflow/server-go"
+	"git.loafle.net/overflow/server-go/socket"
+	"github.com/valyala/fasthttp"
+)
+
+type Servlet interface {
+	socket.Servlet
+
+	Handshake(servletCtx server.ServletCtx, ctx *fasthttp.RequestCtx) (*fasthttp.ResponseHeader, error)
+}
+
+type Servlets struct {
+	Servlet
+}
+
+func (s *Servlets) ServletCtx(serverCtx server.ServerCtx) server.ServletCtx {
+	return server.NewServletContext(nil, serverCtx)
+}
+
+func (s *Servlets) Init(serverCtx server.ServerCtx) error {
+	return nil
+}
+
+func (s *Servlets) OnStart(serverCtx server.ServerCtx) error {
+	return nil
+}
+
+func (s *Servlets) OnStop(serverCtx server.ServerCtx) {
+	//
+}
+
+func (s *Servlets) Destroy(serverCtx server.ServerCtx) {
+	//
+}
+
+func (s *Servlets) Handshake(servletCtx server.ServletCtx, ctx *fasthttp.RequestCtx) (*fasthttp.ResponseHeader, error) {
+	return nil, nil
+}
+
+func (s *Servlets) OnConnect(servletCtx server.ServletCtx, conn socket.Conn) {
+	//
+}
+
+func (s *Servlets) Handle(servletCtx server.ServletCtx, stopChan <-chan struct{}, doneChan chan<- struct{}, readChan <-chan socket.SocketMessage, writeChan chan<- socket.SocketMessage) {
+
+}
+
+func (s *Servlets) OnDisconnect(servletCtx server.ServletCtx) {
+	//
+}

socket/web/upgrade.go

@@ -0,0 +1,279 @@
+// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package web
+
+import (
+	"net"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"git.loafle.net/overflow/server-go/socket"
+	"github.com/valyala/fasthttp"
+)
+
+type (
+	OnUpgradeFunc func(*socket.SocketConn, error)
+)
+
+// HandshakeError describes an error with the handshake from the peer.
+type HandshakeError struct {
+	message string
+}
+
+func (e HandshakeError) Error() string { return e.message }
+
+// Upgrader specifies parameters for upgrading an HTTP connection to a
+// WebSocket connection.
+type Upgrader struct {
+	// HandshakeTimeout specifies the duration for the handshake to complete.
+	HandshakeTimeout time.Duration
+
+	// ReadBufferSize and WriteBufferSize specify I/O buffer sizes. If a buffer
+	// size is zero, then buffers allocated by the HTTP server are used. The
+	// I/O buffer sizes do not limit the size of the messages that can be sent
+	// or received.
+	ReadBufferSize, WriteBufferSize int
+
+	// Subprotocols specifies the server's supported protocols in order of
+	// preference. If this field is set, then the Upgrade method negotiates a
+	// subprotocol by selecting the first match in this list with a protocol
+	// requested by the client.
+	Subprotocols []string
+
+	// Error specifies the function for generating HTTP error responses. If Error
+	// is nil, then http.Error is used to generate the HTTP response.
+	Error func(ctx *fasthttp.RequestCtx, status int, reason error)
+
+	// CheckOrigin returns true if the request Origin header is acceptable. If
+	// CheckOrigin is nil, the host in the Origin header must not be set or
+	// must match the host of the request.
+	CheckOrigin func(ctx *fasthttp.RequestCtx) bool
+
+	// EnableCompression specify if the server should attempt to negotiate per
+	// message compression (RFC 7692). Setting this value to true does not
+	// guarantee that compression will be supported. Currently only "no context
+	// takeover" modes are supported.
+	EnableCompression bool
+	CompressionLevel  int
+}
+
+func (u *Upgrader) returnError(ctx *fasthttp.RequestCtx, status int, reason string) (*socket.SocketConn, error) {
+	err := HandshakeError{reason}
+	if u.Error != nil {
+		u.Error(ctx, status, err)
+	} else {
+		ctx.Response.Header.Set("Sec-Websocket-Version", "13")
+		ctx.Error(http.StatusText(status), status)
+	}
+	return nil, err
+}
+
+// checkSameOrigin returns true if the origin is not set or is equal to the request host.
+func checkSameOrigin(ctx *fasthttp.RequestCtx) bool {
+	origin := string(ctx.Request.Header.Peek("Origin"))
+	if len(origin) == 0 {
+		return true
+	}
+	u, err := url.Parse(origin)
+	if err != nil {
+		return false
+	}
+	return u.Host == string(ctx.Host())
+}
+
+func (u *Upgrader) selectSubprotocol(ctx *fasthttp.RequestCtx, responseHeader *fasthttp.ResponseHeader) string {
+	if u.Subprotocols != nil {
+		clientProtocols := Subprotocols(ctx)
+		for _, serverProtocol := range u.Subprotocols {
+			for _, clientProtocol := range clientProtocols {
+				if clientProtocol == serverProtocol {
+					return clientProtocol
+				}
+			}
+		}
+	} else if responseHeader != nil {
+		return string(responseHeader.Peek("Sec-Websocket-Protocol"))
+	}
+	return ""
+}
+
+// Upgrade upgrades the HTTP server connection to the WebSocket protocol.
+//
+// The responseHeader is included in the response to the client's upgrade
+// request. Use the responseHeader to specify cookies (Set-Cookie) and the
+// application negotiated subprotocol (Sec-Websocket-Protocol).
+//
+// If the upgrade fails, then Upgrade replies to the client with an HTTP error
+// response.
+func (u *Upgrader) Upgrade(ctx *fasthttp.RequestCtx, responseHeader *fasthttp.ResponseHeader, cb OnUpgradeFunc) {
+	if !ctx.IsGet() {
+		cb(u.returnError(ctx, fasthttp.StatusMethodNotAllowed, "websocket: not a websocket handshake: request method is not GET"))
+		return
+	}
+
+	if nil != responseHeader {
+		if v := responseHeader.Peek("Sec-Websocket-Extensions"); nil != v {
+			cb(u.returnError(ctx, fasthttp.StatusInternalServerError, "websocket: application specific 'Sec-Websocket-Extensions' headers are unsupported"))
+			return
+		}
+	}
+
+	if !tokenListContainsValue(&ctx.Request.Header, "Connection", "upgrade") {
+		cb(u.returnError(ctx, fasthttp.StatusBadRequest, "websocket: not a websocket handshake: 'upgrade' token not found in 'Connection' header"))
+		return
+	}
+
+	if !tokenListContainsValue(&ctx.Request.Header, "Upgrade", "websocket") {
+		cb(u.returnError(ctx, fasthttp.StatusBadRequest, "websocket: not a websocket handshake: 'websocket' token not found in 'Upgrade' header"))
+		return
+	}
+
+	if !tokenListContainsValue(&ctx.Request.Header, "Sec-Websocket-Version", "13") {
+		cb(u.returnError(ctx, fasthttp.StatusBadRequest, "websocket: unsupported version: 13 not found in 'Sec-Websocket-Version' header"))
+		return
+	}
+
+	checkOrigin := u.CheckOrigin
+	if checkOrigin == nil {
+		checkOrigin = checkSameOrigin
+	}
+	if !checkOrigin(ctx) {
+		cb(u.returnError(ctx, fasthttp.StatusForbidden, "websocket: 'Origin' header value not allowed"))
+		return
+	}
+
+	challengeKey := string(ctx.Request.Header.Peek("Sec-Websocket-Key"))
+	if challengeKey == "" {
+		cb(u.returnError(ctx, fasthttp.StatusBadRequest, "websocket: not a websocket handshake: `Sec-Websocket-Key' header is missing or blank"))
+		return
+	}
+
+	subprotocol := u.selectSubprotocol(ctx, responseHeader)
+
+	// Negotiate PMCE
+	var compress bool
+	if u.EnableCompression {
+		for _, ext := range parseExtensions(&ctx.Request.Header) {
+			if ext[""] != "permessage-deflate" {
+				continue
+			}
+			compress = true
+			break
+		}
+	}
+
+	ctx.SetStatusCode(fasthttp.StatusSwitchingProtocols)
+	ctx.Response.Header.Set("Upgrade", "websocket")
+	ctx.Response.Header.Set("Connection", "Upgrade")
+	ctx.Response.Header.Set("Sec-Websocket-Accept", ComputeAcceptKey(challengeKey))
+	if subprotocol != "" {
+		ctx.Response.Header.Set("Sec-Websocket-Protocol", subprotocol)
+	}
+	if compress {
+		ctx.Response.Header.Set("Sec-Websocket-Extensions", "permessage-deflate; server_no_context_takeover; client_no_context_takeover")
+	}
+	if nil != responseHeader {
+		responseHeader.VisitAll(func(key, value []byte) {
+			k := string(key)
+			v := string(value)
+			if k == "Sec-Websocket-Protocol" {
+				return
+			}
+			ctx.Response.Header.Set(k, v)
+		})
+	}
+
+	h := &fasthttp.RequestHeader{}
+
+	//copy request headers in order to have access inside the Conn after
+	ctx.Request.Header.CopyTo(h)
+
+	ctx.Hijack(func(netConn net.Conn) {
+		c := socket.NewConn(netConn, true, u.ReadBufferSize, u.WriteBufferSize)
+		c.SetSubprotocol(subprotocol)
+		if compress {
+			c.SetCompressionLevel(u.CompressionLevel)
+			c.SetNewCompressionWriter(socket.CompressNoContextTakeover)
+			c.SetNewDecompressionReader(socket.DecompressNoContextTakeover)
+		}
+
+		// Clear deadlines set by HTTP server.
+		netConn.SetDeadline(time.Time{})
+
+		if u.HandshakeTimeout > 0 {
+			netConn.SetWriteDeadline(time.Now().Add(u.HandshakeTimeout))
+		}
+
+		if u.HandshakeTimeout > 0 {
+			netConn.SetWriteDeadline(time.Time{})
+		}
+
+		cb(c, nil)
+	})
+}
+
+// Upgrade upgrades the HTTP server connection to the WebSocket protocol.
+//
+// This function is deprecated, use websocket.Upgrader instead.
+//
+// The application is responsible for checking the request origin before
+// calling Upgrade. An example implementation of the same origin policy is:
+//
+//	if req.Header.Get("Origin") != "http://"+req.Host {
+//		http.Error(w, "Origin not allowed", 403)
+//		return
+//	}
+//
+// If the endpoint supports subprotocols, then the application is responsible
+// for negotiating the protocol used on the connection. Use the Subprotocols()
+// function to get the subprotocols requested by the client. Use the
+// Sec-Websocket-Protocol response header to specify the subprotocol selected
+// by the application.
+//
+// The responseHeader is included in the response to the client's upgrade
+// request. Use the responseHeader to specify cookies (Set-Cookie) and the
+// negotiated subprotocol (Sec-Websocket-Protocol).
+//
+// The connection buffers IO to the underlying network connection. The
+// readBufSize and writeBufSize parameters specify the size of the buffers to
+// use. Messages can be larger than the buffers.
+//
+// If the request is not a valid WebSocket handshake, then Upgrade returns an
+// error of type HandshakeError. Applications should handle this error by
+// replying to the client with an HTTP error response.
+func Upgrade(ctx *fasthttp.RequestCtx, responseHeader *fasthttp.ResponseHeader, readBufSize, writeBufSize int, cb OnUpgradeFunc) {
+	u := Upgrader{ReadBufferSize: readBufSize, WriteBufferSize: writeBufSize}
+	u.Error = func(ctx *fasthttp.RequestCtx, status int, reason error) {
+		// don't return errors to maintain backwards compatibility
+	}
+	u.CheckOrigin = func(ctx *fasthttp.RequestCtx) bool {
+		// allow all connections by default
+		return true
+	}
+	u.Upgrade(ctx, responseHeader, cb)
+}
+
+// Subprotocols returns the subprotocols requested by the client in the
+// Sec-Websocket-Protocol header.
+func Subprotocols(ctx *fasthttp.RequestCtx) []string {
+	h := strings.TrimSpace(string(ctx.Request.Header.Peek("Sec-Websocket-Protocol")))
+	if h == "" {
+		return nil
+	}
+	protocols := strings.Split(h, ",")
+	for i := range protocols {
+		protocols[i] = strings.TrimSpace(protocols[i])
+	}
+	return protocols
+}
+
+// IsWebSocketUpgrade returns true if the client requested upgrade to the
+// WebSocket protocol.
+func IsWebSocketUpgrade(ctx *fasthttp.RequestCtx) bool {
+	return tokenListContainsValue(&ctx.Request.Header, "Connection", "upgrade") &&
+		tokenListContainsValue(&ctx.Request.Header, "Upgrade", "websocket")
+}

socket/web/util.go

@@ -0,0 +1,272 @@
+// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package web
+
+import (
+	"crypto/rand"
+	"crypto/sha1"
+	"encoding/base64"
+	"io"
+	"net/http"
+	"strings"
+
+	"github.com/valyala/fasthttp"
+)
+
+var keyGUID = []byte("258EAFA5-E914-47DA-95CA-C5AB0DC85B11")
+
+func ComputeAcceptKey(challengeKey string) string {
+	h := sha1.New()
+	h.Write([]byte(challengeKey))
+	h.Write(keyGUID)
+	return base64.StdEncoding.EncodeToString(h.Sum(nil))
+}
+
+func GenerateChallengeKey() (string, error) {
+	p := make([]byte, 16)
+	if _, err := io.ReadFull(rand.Reader, p); err != nil {
+		return "", err
+	}
+	return base64.StdEncoding.EncodeToString(p), nil
+}
+
+// Octet types from RFC 2616.
+var octetTypes [256]byte
+
+const (
+	isTokenOctet = 1 << iota
+	isSpaceOctet
+)
+
+func init() {
+	// From RFC 2616
+	//
+	// OCTET      = <any 8-bit sequence of data>
+	// CHAR       = <any US-ASCII character (octets 0 - 127)>
+	// CTL        = <any US-ASCII control character (octets 0 - 31) and DEL (127)>
+	// CR         = <US-ASCII CR, carriage return (13)>
+	// LF         = <US-ASCII LF, linefeed (10)>
+	// SP         = <US-ASCII SP, space (32)>
+	// HT         = <US-ASCII HT, horizontal-tab (9)>
+	// <">        = <US-ASCII double-quote mark (34)>
+	// CRLF       = CR LF
+	// LWS        = [CRLF] 1*( SP | HT )
+	// TEXT       = <any OCTET except CTLs, but including LWS>
+	// separators = "(" | ")" | "<" | ">" | "@" | "," | ";" | ":" | "\" | <">
+	//              | "/" | "[" | "]" | "?" | "=" | "{" | "}" | SP | HT
+	// token      = 1*<any CHAR except CTLs or separators>
+	// qdtext     = <any TEXT except <">>
+
+	for c := 0; c < 256; c++ {
+		var t byte
+		isCtl := c <= 31 || c == 127
+		isChar := 0 <= c && c <= 127
+		isSeparator := strings.IndexRune(" \t\"(),/:;<=>?@[]\\{}", rune(c)) >= 0
+		if strings.IndexRune(" \t\r\n", rune(c)) >= 0 {
+			t |= isSpaceOctet
+		}
+		if isChar && !isCtl && !isSeparator {
+			t |= isTokenOctet
+		}
+		octetTypes[c] = t
+	}
+}
+
+func skipSpace(s string) (rest string) {
+	i := 0
+	for ; i < len(s); i++ {
+		if octetTypes[s[i]]&isSpaceOctet == 0 {
+			break
+		}
+	}
+	return s[i:]
+}
+
+func nextToken(s string) (token string, rest string) {
+	i := 0
+	for ; i < len(s); i++ {
+		if octetTypes[s[i]]&isTokenOctet == 0 {
+			break
+		}
+	}
+	return s[:i], s[i:]
+}
+
+func nextTokenOrQuoted(s string) (value string, rest string) {
+	if !strings.HasPrefix(s, "\"") {
+		return nextToken(s)
+	}
+	s = s[1:]
+	for i := 0; i < len(s); i++ {
+		switch s[i] {
+		case '"':
+			return s[:i], s[i+1:]
+		case '\\':
+			p := make([]byte, len(s)-1)
+			j := copy(p, s[:i])
+			escape := true
+			for i = i + 1; i < len(s); i++ {
+				b := s[i]
+				switch {
+				case escape:
+					escape = false
+					p[j] = b
+					j++
+				case b == '\\':
+					escape = true
+				case b == '"':
+					return string(p[:j]), s[i+1:]
+				default:
+					p[j] = b
+					j++
+				}
+			}
+			return "", ""
+		}
+	}
+	return "", ""
+}
+
+// tokenListContainsValue returns true if the 1#token header with the given
+// name contains token.
+func tokenListContainsValue(header *fasthttp.RequestHeader, name string, value string) bool {
+	s := string(header.Peek(name))
+	for {
+		var t string
+		t, s = nextToken(skipSpace(s))
+		if t == "" {
+			break
+		}
+		s = skipSpace(s)
+		if s != "" && s[0] != ',' {
+			break
+		}
+		if strings.EqualFold(t, value) {
+			return true
+		}
+		if s == "" {
+			break
+		}
+		s = s[1:]
+	}
+	return false
+}
+
+// parseExtensiosn parses WebSocket extensions from a header.
+func parseExtensions(header *fasthttp.RequestHeader) []map[string]string {
+
+	// From RFC 6455:
+	//
+	//  Sec-WebSocket-Extensions = extension-list
+	//  extension-list = 1#extension
+	//  extension = extension-token *( ";" extension-param )
+	//  extension-token = registered-token
+	//  registered-token = token
+	//  extension-param = token [ "=" (token | quoted-string) ]
+	//     ;When using the quoted-string syntax variant, the value
+	//     ;after quoted-string unescaping MUST conform to the
+	//     ;'token' ABNF.
+	s := string(header.Peek("Sec-Websocket-Extensions"))
+	var result []map[string]string
+headers:
+	for {
+		var t string
+		t, s = nextToken(skipSpace(s))
+		if t == "" {
+			break headers
+		}
+		ext := map[string]string{"": t}
+		for {
+			s = skipSpace(s)
+			if !strings.HasPrefix(s, ";") {
+				break
+			}
+			var k string
+			k, s = nextToken(skipSpace(s[1:]))
+			if k == "" {
+				break headers
+			}
+			s = skipSpace(s)
+			var v string
+			if strings.HasPrefix(s, "=") {
+				v, s = nextTokenOrQuoted(skipSpace(s[1:]))
+				s = skipSpace(s)
+			}
+			if s != "" && s[0] != ',' && s[0] != ';' {
+				break headers
+			}
+			ext[k] = v
+		}
+		if s != "" && s[0] != ',' {
+			break headers
+		}
+		result = append(result, ext)
+		if s == "" {
+			break headers
+		}
+		s = s[1:]
+	}
+
+	return result
+}
+
+// parseExtensiosn parses WebSocket extensions from a header.
+func HttpParseExtensions(header http.Header) []map[string]string {
+
+	// From RFC 6455:
+	//
+	//  Sec-WebSocket-Extensions = extension-list
+	//  extension-list = 1#extension
+	//  extension = extension-token *( ";" extension-param )
+	//  extension-token = registered-token
+	//  registered-token = token
+	//  extension-param = token [ "=" (token | quoted-string) ]
+	//     ;When using the quoted-string syntax variant, the value
+	//     ;after quoted-string unescaping MUST conform to the
+	//     ;'token' ABNF.
+
+	var result []map[string]string
+headers:
+	for _, s := range header["Sec-Websocket-Extensions"] {
+		for {
+			var t string
+			t, s = nextToken(skipSpace(s))
+			if t == "" {
+				continue headers
+			}
+			ext := map[string]string{"": t}
+			for {
+				s = skipSpace(s)
+				if !strings.HasPrefix(s, ";") {
+					break
+				}
+				var k string
+				k, s = nextToken(skipSpace(s[1:]))
+				if k == "" {
+					continue headers
+				}
+				s = skipSpace(s)
+				var v string
+				if strings.HasPrefix(s, "=") {
+					v, s = nextTokenOrQuoted(skipSpace(s[1:]))
+					s = skipSpace(s)
+				}
+				if s != "" && s[0] != ',' && s[0] != ';' {
+					continue headers
+				}
+				ext[k] = v
+			}
+			if s != "" && s[0] != ',' {
+				continue headers
+			}
+			result = append(result, ext)
+			if s == "" {
+				continue headers
+			}
+			s = s[1:]
+		}
+	}
+	return result
+}