X-Git-Url: http://git.scottworley.com/reliable-chat/blobdiff_plain/87ac1d98245de076b321b149cf8c36795f4425e6..cf44a97649f42952e85dca82a91f18fc4e14c1e9:/server/server.go

diff --git a/server/server.go b/server/server.go
index 8c8a989..8dce69b 100644
--- a/server/server.go
+++ b/server/server.go
@@ -1,29 +1,56 @@
+/*  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 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
 }
 
-type FetchResponse struct {
-	Messages []Message
-	Time     time.Time
-}
-
 type StoreRequest struct {
 	StartTime time.Time
 	Messages  chan<- []Message
 }
 
 type Store struct {
-	Add chan Message
-	Get chan StoreRequest
+	Add chan *Message
+	Get chan *StoreRequest
 }
 
 // TODO: Monotonic clock
@@ -31,40 +58,51 @@ type Store struct {
 func manage_store(store Store) {
 	messages := list.New()
 	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)
+				waiter.Value.(*StoreRequest).Messages <- []Message{*new_message}
+				close(waiter.Value.(*StoreRequest).Messages)
+				fetch_wake_count.Add(1)
 			}
 			waiting.Init()
-			if message_count < max_messages {
+			messages.PushBack(new_message)
+			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 {
+				break main
 			}
-		case request := <-store.Get:
-			if messages.Back() == nil || request.StartTime.After(messages.Back().Value.(Message).Time) {
+			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
-				if messages.Front().Value.(Message).Time.After(request.StartTime) {
+				if messages.Front().Value.(*Message).Time.After(request.StartTime) {
 					start = messages.Front()
 					response_size = message_count
 				} else {
-					for start.Prev().Value.(Message).Time.After(request.StartTime) {
+					for start.Prev().Value.(*Message).Time.After(request.StartTime) {
 						start = start.Prev()
 						response_size++
 					}
 				}
 				response_messages := make([]Message, 0, response_size)
 				for m := start; m != nil; m = m.Next() {
-					response_messages = append(response_messages, m.Value.(Message))
+					response_messages = append(response_messages, *m.Value.(*Message))
 				}
 				request.Messages <- response_messages
 			}
@@ -73,11 +111,15 @@ func manage_store(store Store) {
 }
 
 func start_store() Store {
-	store := Store{make(chan Message, 20), make(chan StoreRequest, 20)}
+	store := Store{make(chan *Message, 20), make(chan *StoreRequest, 20)}
 	go manage_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
@@ -92,26 +134,36 @@ func start_server(store Store) {
 			}
 		}
 		messages_from_store := make(chan []Message, 1)
-		store.Get <- StoreRequest{since, messages_from_store}
+		store.Get <- &StoreRequest{since, messages_from_store}
 
-		json_encoded, err := json.Marshal(FetchResponse{<-messages_from_store, time.Now()})
+		json_encoded, err := json.Marshal(<-messages_from_store)
 		if err != nil {
 			log.Print("json encode: ", err)
 			w.WriteHeader(http.StatusInternalServerError)
 			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("/robots.txt", func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte(robots_txt))
 	})
 
-	log.Fatal(http.ListenAndServe(":8080", nil))
+	log.Fatal(http.ListenAndServe(*localaddress+":"+strconv.Itoa(*port), nil))
 }
 
 func main() {
+	flag.Parse()
+	start_time.Set(time.Now().UnixNano())
 	store := start_store()
 	start_server(store)
 }