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194 lines (180 loc) · 3.87 KB
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package main
import (
"encoding/json"
"errors"
"log"
"net"
"net/http"
"net/url"
"strings"
"time"
"github.com/codeskyblue/groupcache"
"github.com/gorilla/websocket"
)
var (
upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
wsclient *websocket.Conn
sendc = make(chan map[string]interface{}, 10)
)
func InitMaster() (err error) {
http.HandleFunc(defaultWSURL, WSHandler)
return nil
}
func WSHandler(w http.ResponseWriter, r *http.Request) {
/*
defer func() {
if e := recover(); e != nil {
log.Println(e)
}
}()
*/
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Println(err)
return
}
log.Println(conn.RemoteAddr())
defer conn.Close()
var name string
remoteHost, _, _ := net.SplitHostPort(conn.RemoteAddr().String())
for {
var err error
var msg = make(map[string]interface{})
if err = conn.ReadJSON(&msg); err != nil {
break
}
action, _ := msg["action"].(string)
switch action {
case "LOGIN":
name = "http://" + remoteHost + ":" + msg["port"].(string)
currKeys := peerGroup.Keys()
peerGroup.AddPeer(name, conn)
err = conn.WriteJSON(map[string]string{
"self": name,
"peers": strings.Join(peerGroup.Keys(), ","),
"mirror": *mirror,
})
peerGroup.RLock()
for _, key := range currKeys {
if s, exists := peerGroup.m[key]; exists {
s.Connection.WriteJSON(map[string]string{
"action": "PEER_UPDATE",
"peers": strings.Join(peerGroup.Keys(), ","),
})
}
}
peerGroup.RUnlock()
log.Printf("Peer: %s JOIN", name)
case "LOG":
delete(msg, "action")
msgb, _ := json.Marshal(map[string]interface{}{
"timestamp": time.Now().Unix(),
"data": msg,
"peer": name,
})
cdnlog.Println(string(msgb))
default:
log.Println("UNKNOWN:", msg)
}
if err != nil {
break
}
}
peerGroup.Delete(name)
peerGroup.RLock()
for _, key := range peerGroup.Keys() {
if s, exists := peerGroup.m[key]; exists {
s.Connection.WriteJSON(map[string]string{
"action": "PEER_UPDATE",
"peers": strings.Join(peerGroup.Keys(), ","),
})
}
}
peerGroup.RUnlock()
log.Printf("Peer: %s QUIT", name)
}
func InitPeer() (err error) {
u, err := url.Parse(*upstream)
if err != nil {
return
}
u.Path = defaultWSURL
conn, err := net.Dial("tcp", u.Host)
if err != nil {
return
}
wsclient, _, err = websocket.NewClient(conn, u, nil, 1024, 1024)
if err != nil {
return
}
// Get slave name from master
_, port, _ := net.SplitHostPort(*address)
wsclient.WriteJSON(map[string]string{
"action": "LOGIN",
"token": *token,
"port": port,
})
var msg = make(map[string]string)
if err = wsclient.ReadJSON(&msg); err != nil {
return err
}
if me, ok := msg["self"]; ok {
if pool == nil {
pool = groupcache.NewHTTPPool(me)
}
peers := strings.Split(msg["peers"], ",")
m := msg["mirror"]
mirror = &m
log.Println("Self name:", me)
log.Println("Peer list:", peers)
log.Println("Mirror site:", *mirror)
pool.Set(peers...)
} else {
return errors.New("'peer_name' not found in master response")
}
// Listen peers update
go func() {
for {
err := wsclient.ReadJSON(&msg)
if err != nil {
if state.IsClosed() {
break
}
log.Println("Connection to master closed !!!")
for {
log.Println("> retry in 5 seconds")
time.Sleep(time.Second * 5)
if err := InitPeer(); err == nil {
break
}
}
break
}
action := msg["action"]
switch action {
case "PEER_UPDATE":
peers := strings.Split(msg["peers"], ",")
log.Println("Update peer list:", peers)
pool.Set(peers...)
}
}
}()
// send queue
go func() {
for msg := range sendc {
//log.Println("Send msg:", msg)
if msg["action"] == nil {
msg["action"] = "LOG"
}
err := wsclient.WriteJSON(msg)
if err != nil {
log.Println("Send queue err:", err)
break
}
}
}()
return nil
}