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blargh-server.go
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blargh-server.go
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package main
import (
"container/list"
"encoding/json"
"fmt"
"net/http"
"sync"
)
//Set up them http handlers
func main(){
messages.Map = make(map[string]chat_msg_buffer_struct)
http.HandleFunc("/chat", chatHandler)
http.HandleFunc("/poll", pollHandler)
http.ListenAndServe(":8080", nil)
}
//I implemented a list with a lock instead of database! time constraints!
type messages_struct struct {
Mu sync.RWMutex
Map map[string]chat_msg_buffer_struct
}
var messages messages_struct
func addMessage(msg chat_msg_struct){
messages.Mu.Lock()
defer messages.Mu.Unlock()
msgs := messages.Map[msg.UsernameTo].Msgs
if(msgs == nil){
msgs = list.New()
}
msgs.PushFront(msg)
if msgs.Len()>15{
msgs.Remove(msgs.Back())
}
}
//Recieves chat_msg_struct from html and stores it
func chatHandler(w http.ResponseWriter, r *http.Request){
decoder := json.NewDecoder(r.Body)
var m chat_msg_struct
err := decoder.Decode(&m)
if err != nil {
fmt.Println(err)
http.Error(w,err.Error(), http.StatusBadRequest)
return;
}
addMessage(m)
}
//recieves a chat_msg_req_struct from html, responds with a chat_msgs_struct
func pollHandler(w http.ResponseWriter, r *http.Request){
decoder := json.NewDecoder(r.Body)
var m chat_msg_req_struct
err := decoder.Decode(&m)
if err != nil {
fmt.Println(err)
http.Error(w,err.Error(), http.StatusBadRequest)
return;
}
enc := json.NewEncoder(w)
ms := getMessages(messages.Map[m.Username].Msgs)
if(ms != nil){
enc.Encode(&ms)
}
}
func getMessages(msgs *list.List) []chat_msg_struct{
var ms []chat_msg_struct
messages.Mu.RLock()
defer messages.Mu.RUnlock()
for i := msgs.Front(); i != nil; i = i.Next(){
ms = append(ms, i.Value.(chat_msg_struct))
}
return ms
}
type chat_msg_buffer_struct struct {
Msgs *list.List
}
//JSON structs
type chat_msg_struct struct {
Msg []byte
UsernameTo string
UsernameFrom string
}
type chat_msgs_struct struct {
Msgs []chat_msg_struct
}
type chat_msg_req_struct struct {
Username string
}