+/* reliable-chat - multipath chat
+ * Copyright (C) 2012 Scott Worley <sworley@chkno.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
package main
import "container/list"
import "encoding/json"
+import "expvar"
+import "flag"
import "log"
import "net/http"
+import "strconv"
import "time"
+var port = flag.Int("port", 21059, "Port to listen on")
+
+var frame_count = expvar.NewInt("frame_count")
+var speak_count = expvar.NewInt("speak_count")
+var fetch_count = expvar.NewInt("fetch_count")
+var fetch_wait_count = expvar.NewInt("fetch_wait_count")
+var fetch_wake_count = expvar.NewInt("fetch_wake_count")
+
type Message struct {
Time time.Time
+ ID string
Text string
}
message_count := 0
max_messages := 1000
waiting := list.New()
+main:
for {
select {
- case new_message := <-store.Add:
- messages.PushBack(new_message)
+ case new_message, ok := <-store.Add:
+ if !ok {
+ break main
+ }
+ speak_count.Add(1)
for waiter := waiting.Front(); waiter != nil; waiter = waiter.Next() {
waiter.Value.(*StoreRequest).Messages <- []Message{*new_message}
close(waiter.Value.(*StoreRequest).Messages)
+ fetch_wake_count.Add(1)
}
waiting.Init()
+ messages.PushBack(new_message)
if message_count < max_messages {
message_count++
} else {
messages.Remove(messages.Front())
}
- case request := <-store.Get:
+ case request, ok := <-store.Get:
+ if !ok {
+ break main
+ }
+ fetch_count.Add(1)
if messages.Back() == nil || !request.StartTime.Before(messages.Back().Value.(*Message).Time) {
waiting.PushBack(request)
+ fetch_wait_count.Add(1)
} else {
start := messages.Back()
response_size := 1
return store
}
+const frame_html = `<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
+ "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
+
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+ <script type="text/javascript"><!--//--><![CDATA[//><!--
+ var since;
+ function go() {
+ var delay = 10000;
+ var xhr = new XMLHttpRequest();
+ xhr.onreadystatechange = function() {
+ if (this.readyState == this.DONE) {
+ if (this.status == 200) {
+ var rtxt = this.responseText;
+ if (rtxt != null) {
+ var r = JSON.parse(rtxt);
+ if (r != null) {
+ window.parent.postMessage(rtxt, "*");
+ delay = 40;
+ if (r.length >= 1 && "Time" in r[r.length-1]) {
+ since = r[r.length-1]["Time"];
+ }
+ }
+ }
+ }
+ window.setTimeout(go, delay);
+ }
+ }
+ var uri = "/fetch";
+ if (since) {
+ uri += '?since="' + since + '"';
+ }
+ xhr.open("GET", uri);
+ xhr.send();
+ }
+ //--><!]]></script>
+</head>
+<body onload="go()">
+</body>
+</html>
+`
+
func start_server(store Store) {
http.HandleFunc("/fetch", func(w http.ResponseWriter, r *http.Request) {
var since time.Time
return
}
w.Header().Add("Content-Type", "application/json")
+ w.Header().Add("Access-Control-Allow-Origin", "*")
w.Write(json_encoded)
})
http.HandleFunc("/speak", func(w http.ResponseWriter, r *http.Request) {
- store.Add <- &Message{time.Now(), r.FormValue("text")}
+ store.Add <- &Message{
+ time.Now(),
+ r.FormValue("id"),
+ r.FormValue("text")}
+ })
+
+ http.HandleFunc("/frame", func(w http.ResponseWriter, r *http.Request) {
+ frame_count.Add(1)
+ w.Write([]byte(frame_html));
})
- log.Fatal(http.ListenAndServe(":8080", nil))
+ log.Fatal(http.ListenAndServe(":"+strconv.Itoa(*port), nil))
}
func main() {
+ flag.Parse()
store := start_store()
start_server(store)
}
projects / reliable-chat / blobdiff