/
redisocket.go
257 lines (222 loc) · 4.89 KB
/
redisocket.go
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package redisocket
import (
"errors"
"net/http"
"sync"
"time"
"github.com/garyburd/redigo/redis"
"github.com/gorilla/websocket"
)
const (
writeWait = 10 * time.Second
pongWait = 60 * time.Second
pingPeriod = (pongWait * 9) / 10
maxMessageSize = 512
)
var conn redis.Conn
var APPCLOSE = errors.New("APP_CLOSE")
var Upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool { return true },
}
type CloseHandler func() error
//MsgHandler Handle client i/o message
type MsgHandler interface {
//AfterReadStream
AfterReadStream(data []byte) error
//BeforeWriteStream
BeforeWriteStream(data []byte) ([]byte, error)
}
//Subscriber
type Subscriber interface {
//Clients start listen. It's blocked
Listen(h MsgHandler) error
//Close clients connection
Close()
//When the subscribe subject update. App can Notify Subscriber
Update(data []byte)
}
type App interface {
// It client's Producer
NewClient(w http.ResponseWriter, r *http.Request) (Subscriber, error)
//A Subscriber can subscribe subject
Subscribe(subject string, c Subscriber) error
//A Subscriber can unsubscribe subject
Unsubscribe(subject string, c Subscriber) error
//It can notify subscriber
Notify(subject string, data []byte) (int, error)
//A subscriber can cancel all subscriptions
UnsubscribeAll(c Subscriber)
//App start listen. It's blocked
Listen() error
//List Redis All Subject
ListSubject() ([]string, error)
//Count Redis Subject's subscribers
NumSubscriber(subject string) (int, error)
//App Close
Close()
}
//NewApp It's create a App
func NewApp(p *redis.Pool) App {
e := &app{
rpool: p,
psc: &redis.PubSubConn{p.Get()},
RWMutex: new(sync.RWMutex),
subjects: make(map[string]map[Subscriber]bool),
subscribers: make(map[Subscriber]map[string]bool),
closeSign: make(chan int),
}
return e
}
func (e *app) NewClient(w http.ResponseWriter, r *http.Request) (c Subscriber, err error) {
ws, err := Upgrader.Upgrade(w, r, nil)
c = &client{
ws: ws,
send: make(chan []byte, 4096),
RWMutex: new(sync.RWMutex),
app: e,
}
return
}
type app struct {
psc *redis.PubSubConn
rpool *redis.Pool
subjects map[string]map[Subscriber]bool
subscribers map[Subscriber]map[string]bool
closeSign chan int
*sync.RWMutex
}
func (a *app) Subscribe(event string, c Subscriber) (err error) {
a.Lock()
defer a.Unlock()
//observer map
if m, ok := a.subscribers[c]; ok {
m[event] = true
} else {
events := make(map[string]bool)
events[event] = true
a.subscribers[c] = events
}
//event map
if m, ok := a.subjects[event]; ok {
m[c] = true
} else {
clients := make(map[Subscriber]bool)
clients[c] = true
a.subjects[event] = clients
err = a.psc.Subscribe(event)
if err != nil {
return
}
}
return
}
func (a *app) Unsubscribe(event string, c Subscriber) (err error) {
a.Lock()
defer a.Unlock()
//observer map
if m, ok := a.subscribers[c]; ok {
delete(m, event)
}
//event map
if m, ok := a.subjects[event]; ok {
delete(m, c)
if len(m) == 0 {
err = a.psc.Unsubscribe(event)
if err != nil {
return
}
}
}
return
}
func (a *app) UnsubscribeAll(c Subscriber) {
a.Lock()
defer a.Unlock()
if m, ok := a.subscribers[c]; ok {
for e, _ := range m {
delete(a.subjects[e], c)
}
delete(a.subscribers, c)
}
return
}
func (a *app) listenRedis() <-chan error {
errChan := make(chan error)
go func() {
for {
switch v := a.psc.Receive().(type) {
case redis.Message:
a.RLock()
clients := a.subjects[v.Channel]
a.RUnlock()
for c, _ := range clients {
c.Update(v.Data)
}
case error:
errChan <- v
for c, _ := range a.subscribers {
a.UnsubscribeAll(c)
c.Close()
}
break
}
}
}()
return errChan
}
func (a *app) Listen() error {
redisErr := a.listenRedis()
select {
case e := <-redisErr:
close(a.closeSign)
return e
case <-a.closeSign:
close(a.closeSign)
for c, _ := range a.subscribers {
a.UnsubscribeAll(c)
c.Close()
}
return APPCLOSE
}
}
func (a *app) ListSubject() (subs []string, err error) {
reply, err := redis.Values(a.rpool.Get().Do("PUBSUB", "CHANNELS"))
if err != nil {
return
}
if len(reply) == 0 {
return
}
if err = redis.ScanSlice(reply, &subs); err != nil {
return
}
return
}
func (a *app) NumSubscriber(subject string) (c int, err error) {
reply, err := redis.Values(a.rpool.Get().Do("PUBSUB", "NUMSUB", subject))
if err != nil {
return
}
if len(reply) == 0 {
return 0, nil
}
var channel string
var count int
if _, err = redis.Scan(reply, &channel, &count); err != nil {
return
}
return
}
func (a *app) Close() {
a.closeSign <- 1
return
}
func (e *app) Notify(event string, data []byte) (val int, err error) {
conn := e.rpool.Get()
defer conn.Close()
val, err = redis.Int(conn.Do("PUBLISH", event, data))
err = e.rpool.Get().Flush()
return
}