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fasthttp sse
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package main | |
import ( | |
"bufio" | |
"fmt" | |
"log" | |
"time" | |
"github.com/valyala/fasthttp" | |
) | |
func main() { | |
h := requestHandler | |
if err := fasthttp.ListenAndServe(":9004", h); err != nil { | |
log.Fatalf("Error in ListenAndServe: %s", err) | |
} | |
} | |
func requestHandler(ctx *fasthttp.RequestCtx) { | |
fmt.Println("HERE") | |
// ctx.SetContentType("text/event-stream; charset=utf8") | |
ctx.SetContentType("text/event-stream") | |
ctx.Response.Header.Set("Cache-Control", "no-cache") | |
ctx.Response.Header.Set("Connection", "keep-alive") | |
ctx.Response.Header.Set("Transfer-Encoding", "chunked") | |
ctx.Response.Header.Set("Access-Control-Allow-Origin", "*") | |
ctx.Response.Header.Set("Access-Control-Allow-Headers", "Cache-Control") | |
ctx.Response.Header.Set("Access-Control-Allow-Credentials", "true") | |
ctx.SetBodyStreamWriter(fasthttp.StreamWriter(func(w *bufio.Writer) { | |
fmt.Println("WRITER") | |
var i int | |
for { | |
i++ | |
msg := fmt.Sprintf("%d - the time is %v", i, time.Now()) | |
fmt.Fprintf(w, "data: Message: %s\n\n", msg) | |
fmt.Println(msg) | |
// Flush the response. This is only possible if | |
// the repsonse supports streaming. | |
w.Flush() | |
time.Sleep(5 * time.Second) | |
} | |
})) | |
} |
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// added in revel.AddInitEventHandler | |
// on revel.ENGINE_BEFORE_INITIALIZED event | |
// revel.AddHTTPMux("/streaming", streamingHandler) | |
// and not working | |
var streamingHandler = fasthttp.RequestHandler(func(ctx *fasthttp.RequestCtx) { | |
fmt.Println("HERE") | |
// ctx.SetContentType("text/event-stream; charset=utf8") | |
ctx.SetContentType("text/event-stream") | |
ctx.Response.Header.Set("Cache-Control", "no-cache") | |
ctx.Response.Header.Set("Connection", "keep-alive") | |
ctx.Response.Header.Set("Transfer-Encoding", "chunked") | |
ctx.Response.Header.Set("Access-Control-Allow-Origin", "*") | |
ctx.Response.Header.Set("Access-Control-Allow-Headers", "Cache-Control") | |
ctx.Response.Header.Set("Access-Control-Allow-Credentials", "true") | |
ctx.SetBodyStreamWriter(fasthttp.StreamWriter(func(w *bufio.Writer) { | |
fmt.Println("WRITER") | |
var i int | |
for { | |
i++ | |
msg := fmt.Sprintf("%d - the time is %v", i, time.Now()) | |
fmt.Fprintf(w, "data: Message: %s\n\n", msg) | |
fmt.Println(msg) | |
// Flush the response. This is only possible if | |
// the repsonse supports streaming. | |
w.Flush() | |
time.Sleep(5 * time.Second) | |
} | |
})) | |
}) | |
var streamingGohttpHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | |
fmt.Println("HERE") | |
f, ok := w.(http.Flusher) | |
if !ok { | |
fmt.Println("Streaming unsupported!", http.StatusInternalServerError) | |
http.Error(w, "Streaming unsupported!", http.StatusInternalServerError) | |
return | |
} | |
fmt.Println("Streaming supported") | |
// Set the headers related to event streaming. | |
w.Header().Set("Content-Type", "text/event-stream") | |
w.Header().Set("Cache-Control", "no-cache") | |
w.Header().Set("Connection", "keep-alive") | |
w.Header().Set("Transfer-Encoding", "chunked") | |
w.Header().Set("Access-Control-Allow-Origin", "*") | |
w.Header().Set("Access-Control-Allow-Headers", "Cache-Control") | |
w.Header().Set("Access-Control-Allow-Credentials", "true") | |
// can be used easy as standart handler in development mode | |
// coz it user EventSource which recover connection after close, | |
for i := 1; i < 100; i++ { | |
msg := fmt.Sprintf("%d - the time is %v", i, time.Now()) | |
fmt.Fprintf(w, "data: Message: %s\n\n", msg) | |
fmt.Println(msg) | |
// Flush the response. This is only possible if | |
// the repsonse supports streaming. | |
f.Flush() | |
time.Sleep(5 * time.Second) | |
} | |
}) |
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package models | |
// i like to use sse as revel.Result something like | |
// func (ctrl EventSource) Index() revel.Result { | |
// return models.SSEClient{} | |
// } | |
// not working atm | |
import ( | |
"fmt" | |
"io" | |
"net/http" | |
"time" | |
"github.com/revel/revel" | |
) | |
// SSEResponse is Writer wrapper to hide Closer interface | |
type SSEResponse struct { | |
writer io.Writer | |
} | |
// Write wrapper | |
func (sse SSEResponse) Write(p []byte) (n int, err error) { | |
fmt.Println("SSE WRITE") | |
return sse.writer.Write(p) | |
} | |
// Close wrapper | |
func (sse SSEResponse) Close() (err error) { | |
fmt.Println("SSE CLOSE") | |
return | |
} | |
// SSEClient is | |
type SSEClient struct { | |
} | |
// fasthttp.responseBodyWriter | |
// Apply is | |
func (handle SSEClient) Apply(req *revel.Request, resp *revel.Response) { | |
if w, ok := resp.GetWriter().(http.ResponseWriter); ok { | |
fmt.Printf("SSE SERVE HTTP %T\n", w) | |
resp.SetWriter(SSEResponse{ | |
writer: w, | |
}) | |
go func() { | |
// Make sure that the writer supports flushing. | |
f, ok := w.(http.Flusher) | |
if !ok { | |
fmt.Println("Streaming unsupported!", http.StatusInternalServerError) | |
http.Error(w, "Streaming unsupported!", http.StatusInternalServerError) | |
return | |
} | |
fmt.Println("Streaming supported") | |
// Set the headers related to event streaming. | |
w.Header().Set("Content-Type", "text/event-stream") | |
w.Header().Set("Cache-Control", "no-cache") | |
w.Header().Set("Connection", "keep-alive") | |
w.Header().Set("Transfer-Encoding", "chunked") | |
w.Header().Set("Access-Control-Allow-Origin", "*") | |
w.Header().Set("Access-Control-Allow-Headers", "Cache-Control") | |
w.Header().Set("Access-Control-Allow-Credentials", "true") | |
// can be used easy as standart handler in development mode | |
// coz it user EventSource which recover connection after close, | |
for i := 1; i < 100; i++ { | |
msg := fmt.Sprintf("%d - the time is %v", i, time.Now()) | |
fmt.Fprintf(w, "data: Message: %s\n\n", msg) | |
fmt.Println(msg) | |
// Flush the response. This is only possible if | |
// the repsonse supports streaming. | |
f.Flush() | |
time.Sleep(5 * time.Second) | |
} | |
}() | |
} else { | |
fmt.Printf("OOPS %T\n", resp.GetWriter()) | |
} | |
} |
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="utf-8"> | |
<title>EventSource Demo</title> | |
<script src="/js/jquery-2.2.4.min.js"></script> | |
</head> | |
<style> | |
* { | |
box-sizing: border-box; | |
} | |
body { | |
background-color: #eee; | |
font: 100%/1.5 "Source Sans Pro", "Helvetica Neue", Helvetica, sans-serif; | |
padding-top: 2em; | |
} | |
.container { | |
max-width: 720px; | |
margin: 0 auto; | |
padding: 20px; | |
background-color: #fff; | |
color: #333; | |
border: 1px solid #ddd; | |
} | |
h1 { | |
margin-top: 0; | |
} | |
#messages { | |
max-height: 480px; | |
overflow-y: auto; | |
} | |
</style> | |
<script> | |
$(function() { | |
var source = new EventSource('/events/astalavistababy/testdrive'); // change to correct endpoint | |
source.onopen = function (event) { | |
console.log("eventsource connection open"); | |
}; | |
source.onerror = function(event) { | |
if (event.target.readyState === 0) { | |
console.log("reconnecting to eventsource"); | |
} else { | |
console.log("eventsource error", event); | |
} | |
}; | |
source.onmessage = function(event) { | |
console.log(event.data) | |
$('<div>', { | |
text: event.data, | |
css: { | |
display: "none" | |
} | |
}) | |
.prependTo("#messages") | |
.show("fast") | |
; | |
}; | |
}); | |
</script> | |
<body> | |
<div class="container"> | |
<h1>Messages</h1> | |
<div id="messages"></div> | |
</div> | |
</body> | |
</html> |
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