/
handler.go
90 lines (80 loc) · 1.67 KB
/
handler.go
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package http
import (
"fmt"
"io/ioutil"
"net/http"
"github.com/asim/mq/broker"
"github.com/gorilla/websocket"
)
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool {
return true
},
}
func pub(w http.ResponseWriter, r *http.Request) {
topic := r.URL.Query().Get("topic")
if websocket.IsWebSocketUpgrade(r) {
conn, err := upgrader.Upgrade(w, r, w.Header())
if err != nil {
return
}
for {
messageType, b, err := conn.ReadMessage()
if messageType == -1 {
return
}
if err != nil {
continue
}
broker.Publish(topic, b)
}
} else {
b, err := ioutil.ReadAll(r.Body)
if err != nil {
http.Error(w, "Pub error", http.StatusInternalServerError)
return
}
r.Body.Close()
if err := broker.Publish(topic, b); err != nil {
http.Error(w, "Pub error", http.StatusInternalServerError)
}
}
}
func sub(w http.ResponseWriter, r *http.Request) {
var wr writer
if websocket.IsWebSocketUpgrade(r) {
conn, err := upgrader.Upgrade(w, r, w.Header())
if err != nil {
return
}
// Drain the websocket so that we handle pings and connection close
go func(c *websocket.Conn) {
for {
if _, _, err := c.NextReader(); err != nil {
c.Close()
break
}
}
}(conn)
wr = &wsWriter{conn}
} else {
wr = &httpWriter{w}
}
topic := r.URL.Query().Get("topic")
ch, err := broker.Subscribe(topic)
if err != nil {
http.Error(w, fmt.Sprintf("Could not retrieve events: %v", err), http.StatusInternalServerError)
return
}
defer broker.Unsubscribe(topic, ch)
for {
select {
case e := <-ch:
if err = wr.Write(e); err != nil {
return
}
}
}
}