a working echo client and server using gorilla
Signed-off-by: Jeff Carr <jcarr@wit.com>
This commit is contained in:
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0a5aa8e447
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// Copyright 2015 The Gorilla WebSocket Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ignore
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package main
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import (
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"flag"
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"log"
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"net/url"
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"os"
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"os/signal"
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"time"
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"github.com/gorilla/websocket"
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)
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// var addr = flag.String("addr", "localhost:8080", "http service address")
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var addr = flag.String("addr", "v000185.testing.com.customers.wprod.wit.com:9000", "http service address")
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func main() {
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flag.Parse()
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log.SetFlags(0)
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interrupt := make(chan os.Signal, 1)
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signal.Notify(interrupt, os.Interrupt)
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u := url.URL{Scheme: "ws", Host: *addr, Path: "/echo"}
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log.Printf("connecting to %s", u.String())
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c, _, err := websocket.DefaultDialer.Dial(u.String(), nil)
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if err != nil {
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log.Fatal("dial:", err)
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}
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defer c.Close()
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done := make(chan struct{})
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go func() {
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defer close(done)
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for {
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_, message, err := c.ReadMessage()
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if err != nil {
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log.Println("read:", err)
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return
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}
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log.Printf("recv: %s", message)
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}
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}()
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ticker := time.NewTicker(time.Second)
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defer ticker.Stop()
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for {
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select {
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case <-done:
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return
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case t := <-ticker.C:
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err := c.WriteMessage(websocket.TextMessage, []byte(t.String()))
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if err != nil {
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log.Println("write:", err)
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return
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}
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case <-interrupt:
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log.Println("interrupt")
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// Cleanly close the connection by sending a close message and then
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// waiting (with timeout) for the server to close the connection.
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err := c.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""))
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if err != nil {
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log.Println("write close:", err)
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return
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}
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select {
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case <-done:
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case <-time.After(time.Second):
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}
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return
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}
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}
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}
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@ -0,0 +1,268 @@
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// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Command server is a test server for the Autobahn WebSockets Test Suite.
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package main
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import (
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"errors"
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"flag"
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"io"
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"log"
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"net/http"
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"time"
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"unicode/utf8"
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"github.com/gorilla/websocket"
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)
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var upgrader = websocket.Upgrader{
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ReadBufferSize: 4096,
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WriteBufferSize: 4096,
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EnableCompression: true,
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CheckOrigin: func(r *http.Request) bool {
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return true
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},
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}
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// echoCopy echoes messages from the client using io.Copy.
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func echoCopy(w http.ResponseWriter, r *http.Request, writerOnly bool) {
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conn, err := upgrader.Upgrade(w, r, nil)
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if err != nil {
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log.Println("Upgrade:", err)
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return
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}
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defer conn.Close()
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for {
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mt, r, err := conn.NextReader()
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if err != nil {
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if err != io.EOF {
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log.Println("NextReader:", err)
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}
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return
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}
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if mt == websocket.TextMessage {
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r = &validator{r: r}
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}
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w, err := conn.NextWriter(mt)
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if err != nil {
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log.Println("NextWriter:", err)
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return
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}
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if mt == websocket.TextMessage {
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r = &validator{r: r}
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}
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if writerOnly {
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_, err = io.Copy(struct{ io.Writer }{w}, r)
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} else {
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_, err = io.Copy(w, r)
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}
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if err != nil {
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if err == errInvalidUTF8 {
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conn.WriteControl(websocket.CloseMessage,
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websocket.FormatCloseMessage(websocket.CloseInvalidFramePayloadData, ""),
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time.Time{})
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}
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log.Println("Copy:", err)
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return
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}
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err = w.Close()
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if err != nil {
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log.Println("Close:", err)
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return
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}
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}
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}
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func echoCopyWriterOnly(w http.ResponseWriter, r *http.Request) {
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echoCopy(w, r, true)
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}
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func echoCopyFull(w http.ResponseWriter, r *http.Request) {
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echoCopy(w, r, false)
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}
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// echoReadAll echoes messages from the client by reading the entire message
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// with ioutil.ReadAll.
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func echoReadAll(w http.ResponseWriter, r *http.Request, writeMessage, writePrepared bool) {
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conn, err := upgrader.Upgrade(w, r, nil)
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if err != nil {
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log.Println("Upgrade:", err)
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return
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}
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defer conn.Close()
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for {
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mt, b, err := conn.ReadMessage()
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if err != nil {
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if err != io.EOF {
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log.Println("NextReader:", err)
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}
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return
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}
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if mt == websocket.TextMessage {
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if !utf8.Valid(b) {
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conn.WriteControl(websocket.CloseMessage,
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websocket.FormatCloseMessage(websocket.CloseInvalidFramePayloadData, ""),
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time.Time{})
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log.Println("ReadAll: invalid utf8")
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}
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}
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if writeMessage {
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if !writePrepared {
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err = conn.WriteMessage(mt, b)
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if err != nil {
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log.Println("WriteMessage:", err)
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}
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} else {
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pm, err := websocket.NewPreparedMessage(mt, b)
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if err != nil {
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log.Println("NewPreparedMessage:", err)
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return
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}
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err = conn.WritePreparedMessage(pm)
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if err != nil {
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log.Println("WritePreparedMessage:", err)
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}
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}
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} else {
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w, err := conn.NextWriter(mt)
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if err != nil {
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log.Println("NextWriter:", err)
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return
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}
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if _, err := w.Write(b); err != nil {
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log.Println("Writer:", err)
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return
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}
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if err := w.Close(); err != nil {
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log.Println("Close:", err)
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return
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}
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}
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}
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}
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func echoReadAllWriter(w http.ResponseWriter, r *http.Request) {
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echoReadAll(w, r, false, false)
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}
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func echoReadAllWriteMessage(w http.ResponseWriter, r *http.Request) {
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echoReadAll(w, r, true, false)
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}
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func echoReadAllWritePreparedMessage(w http.ResponseWriter, r *http.Request) {
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echoReadAll(w, r, true, true)
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}
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func serveHome(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path != "/" {
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http.Error(w, "Not found.", http.StatusNotFound)
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return
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}
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if r.Method != "GET" {
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http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
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return
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}
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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io.WriteString(w, "<html><body>Echo Server</body></html>")
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}
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var addr = flag.String("addr", ":9000", "http service address")
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func main() {
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flag.Parse()
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http.HandleFunc("/", serveHome)
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http.HandleFunc("/c", echoCopyWriterOnly)
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http.HandleFunc("/f", echoCopyFull)
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http.HandleFunc("/echo", echoCopyFull)
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http.HandleFunc("/r", echoReadAllWriter)
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http.HandleFunc("/m", echoReadAllWriteMessage)
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http.HandleFunc("/p", echoReadAllWritePreparedMessage)
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log.Println("Starting http.ListenAndServe() on port 9000")
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err := http.ListenAndServe(*addr, nil)
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if err != nil {
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log.Fatal("ListenAndServe: ", err)
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}
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}
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type validator struct {
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state int
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x rune
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r io.Reader
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}
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var errInvalidUTF8 = errors.New("invalid utf8")
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func (r *validator) Read(p []byte) (int, error) {
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n, err := r.r.Read(p)
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state := r.state
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x := r.x
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for _, b := range p[:n] {
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state, x = decode(state, x, b)
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if state == utf8Reject {
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break
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}
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}
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r.state = state
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r.x = x
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if state == utf8Reject || (err == io.EOF && state != utf8Accept) {
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return n, errInvalidUTF8
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}
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return n, err
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}
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// UTF-8 decoder from http://bjoern.hoehrmann.de/utf-8/decoder/dfa/
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//
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// Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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var utf8d = [...]byte{
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 00..1f
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 20..3f
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 40..5f
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 60..7f
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, // 80..9f
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, // a0..bf
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8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // c0..df
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0xa, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x4, 0x3, 0x3, // e0..ef
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0xb, 0x6, 0x6, 0x6, 0x5, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, // f0..ff
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0x0, 0x1, 0x2, 0x3, 0x5, 0x8, 0x7, 0x1, 0x1, 0x1, 0x4, 0x6, 0x1, 0x1, 0x1, 0x1, // s0..s0
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, // s1..s2
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1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, // s3..s4
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1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, // s5..s6
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1, 3, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // s7..s8
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}
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const (
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utf8Accept = 0
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utf8Reject = 1
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)
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func decode(state int, x rune, b byte) (int, rune) {
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t := utf8d[b]
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if state != utf8Accept {
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x = rune(b&0x3f) | (x << 6)
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} else {
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x = rune((0xff >> t) & b)
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}
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state = int(utf8d[256+state*16+int(t)])
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return state, x
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}
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