Created
February 22, 2016 01:37
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another event source golang example
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| package main | |
| import ( | |
| "fmt" | |
| "log" | |
| "net/http" | |
| "time" | |
| "github.com/NYTimes/gziphandler" | |
| "github.com/donovanhide/eventsource" | |
| ) | |
| type TimeEvent time.Time | |
| func (t TimeEvent) Id() string { return fmt.Sprint(time.Time(t).UnixNano()) } | |
| func (t TimeEvent) Event() string { return "" } | |
| func (t TimeEvent) Data() string { return time.Time(t).String() } | |
| func main() { | |
| eventsHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | |
| s := eventsource.NewServer() | |
| s.Gzip = true | |
| go func() { | |
| id := 1 | |
| for { | |
| e := TimeEvent(time.Now()) | |
| s.Publish([]string{"time"}, &e) | |
| id++ | |
| if id == 10 { | |
| break | |
| } | |
| time.Sleep(1 * time.Second) | |
| } | |
| s.Close() | |
| }() | |
| s.Handler("time").ServeHTTP(w, r) | |
| }) | |
| gzipEventsHandler := gziphandler.GzipHandler(eventsHandler) | |
| http.Handle("/events", gzipEventsHandler) | |
| http.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | |
| w.Header().Set("Content-Type", "text/html") | |
| w.Write([]byte(index)) | |
| })) | |
| log.Println("listening 9000") | |
| log.Fatal(http.ListenAndServe(":9000", nil)) | |
| } | |
| const index = `<!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>event source test</title> | |
| </head> | |
| <body> | |
| <div id="events"> | |
| </div> | |
| <script src="poly.js" type="text/javascript"></script> | |
| <script type="text/javascript"> | |
| console.log("hello") | |
| var source = new EventSource("/events", { withCredentials: true }); | |
| source.onmessage = function(e) { | |
| console.log(e); | |
| var elem = document.createElement("div"); | |
| elem.innerHTML = "event: " + e.data; | |
| events.appendChild(elem); | |
| window.last = e; | |
| }; | |
| source.onerror = function(err) { | |
| console.warn(err); | |
| }; | |
| source.onclose = function(err) { | |
| console.info("closed", err); | |
| }; | |
| </script> | |
| </body> | |
| </html> | |
| ` |
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