X-Git-Url: http://git.scottworley.com/reliable-chat/blobdiff_plain/03513e5ce2d22d140752efeb3aefa72266bd9d87..7310ffeebfda8540d2113fc8c846971a0f913d57:/server/server.go

diff --git a/server/server.go b/server/server.go
index a328785..963931f 100644
--- a/server/server.go
+++ b/server/server.go
@@ -1,3 +1,20 @@
+/*  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"
@@ -10,14 +27,19 @@ import "strconv"
 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
+	ID   string
 	Text string
 }
 
@@ -31,12 +53,43 @@ type Store struct {
 	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 {
@@ -53,10 +106,11 @@ main:
 			}
 			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 {
@@ -94,6 +148,10 @@ func start_store() Store {
 	return store
 }
 
+const robots_txt = `User-agent: *
+Disallow: /
+`
+
 func start_server(store Store) {
 	http.HandleFunc("/fetch", func(w http.ResponseWriter, r *http.Request) {
 		var since time.Time
@@ -117,17 +175,29 @@ 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(), r.FormValue("text")}
+		store.Add <- &Message{
+			now(),
+			r.FormValue("id"),
+			r.FormValue("text")}
+		w.Header().Add("Access-Control-Allow-Origin", "*")
+	})
+
+	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)
 }