+/* 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, version 3.
+ *
+ * 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 "time"
var port = flag.Int("port", 21059, "Port to listen on")
+var localaddress = flag.String("localaddress", "", "Local address to bind to")
+var max_messages = flag.Int("maxmessages", 1000, "Maximum number of messages to retain")
+var start_time = expvar.NewInt("start_time")
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")
+var drop_due_to_limit_count = expvar.NewInt("drop_due_to_limit_count")
type Message struct {
Time time.Time
Get chan *StoreRequest
}
-// TODO: Monotonic clock
+var monotonic_clock chan chan time.Time
+
+const minimum_clock_increment = time.Millisecond
+
+func start_clock() {
+ internal_monotonic_clock := make(chan chan time.Time, 1)
+ go func() {
+ last_time := time.Now()
+ main:
+ for {
+ select {
+ case request, ok := <-internal_monotonic_clock:
+ if !ok {
+ break main
+ }
+ earliest_acceptable_time := last_time.Add(minimum_clock_increment)
+ current_time := time.Now()
+ if current_time.Before(earliest_acceptable_time) {
+ current_time = earliest_acceptable_time
+ }
+ request <- current_time
+ last_time = current_time
+ }
+ }
+ }()
+ monotonic_clock = internal_monotonic_clock
+}
+
+func now() time.Time {
+ c := make(chan time.Time, 0)
+ monotonic_clock <- c
+ return <-c
+}
func manage_store(store Store) {
messages := list.New()
message_count := 0
- max_messages := 1000
waiting := list.New()
main:
for {
}
waiting.Init()
messages.PushBack(new_message)
- if message_count < max_messages {
+ if message_count < *max_messages {
message_count++
} else {
messages.Remove(messages.Front())
+ drop_due_to_limit_count.Add(1)
}
case request, ok := <-store.Get:
if !ok {
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>
+const robots_txt = `User-agent: *
+Disallow: /
`
func start_server(store Store) {
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(),
+ now(),
r.FormValue("id"),
r.FormValue("text")}
+ w.Header().Add("Access-Control-Allow-Origin", "*")
})
- http.HandleFunc("/frame", func(w http.ResponseWriter, r *http.Request) {
- w.Write([]byte(frame_html));
+ http.HandleFunc("/robots.txt", func(w http.ResponseWriter, r *http.Request) {
+ w.Write([]byte(robots_txt))
})
- log.Fatal(http.ListenAndServe(":"+strconv.Itoa(*port), nil))
+ log.Fatal(http.ListenAndServe(*localaddress+":"+strconv.Itoa(*port), nil))
}
func main() {
flag.Parse()
+ start_clock()
+ start_time.Set(now().UnixNano())
store := start_store()
start_server(store)
}
projects / reliable-chat / blobdiff