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burlesque/server.go

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package main
import (
"encoding/json"
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"fmt"
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"io/ioutil"
"net/http"
"runtime"
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"strconv"
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"strings"
)
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func StartServer() {
port := fmt.Sprintf(":%d", Config.Port)
err := http.ListenAndServe(port, nil)
if err != nil {
Error(err, "Error starting server on port %d", Config.Port)
}
}
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func StatusHandler(w http.ResponseWriter, r *http.Request) {
info := make(map[string]map[string]uint)
for _, q := range queues {
info[q.Name] = map[string]uint{
"messages": q.Counter.Distance(),
"subscriptions": 0,
}
}
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for _, r := range pool.Requests {
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for _, q := range r.Queues {
info[q]["subscriptions"]++
}
}
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jsn, _ := json.Marshal(info)
w.Write(jsn)
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}
func DebugHandler(w http.ResponseWriter, r *http.Request) {
info := make(map[string]interface{})
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info["version"] = Version
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info["goroutines"] = runtime.NumGoroutine()
s, err := storage.Status()
if err != nil {
Error(err, "Failed to get Kyoto Cabinet status")
}
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s = s[:len(s)-1] // Removing trailing new line
ks := make(map[string]interface{})
tokens := strings.Split(s, "\n")
for _, t := range tokens {
tt := strings.Split(t, "\t")
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num, err := strconv.Atoi(tt[1])
if err != nil {
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ks[tt[0]] = tt[1]
} else {
ks[tt[0]] = num
}
}
info["kyoto_cabinet"] = ks
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jsn, _ := json.Marshal(info)
w.Write(jsn)
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}
func PublishHandler(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
msg, _ := ioutil.ReadAll(r.Body)
if len(msg) == 0 {
msg = Message(r.FormValue("msg"))
}
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qname := r.FormValue("queue")
ok := RegisterPublication(qname, msg)
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if ok {
w.Write([]byte("OK"))
} else {
http.Error(w, "FAIL", 500)
}
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}
func SubscriptionHandler(w http.ResponseWriter, r *http.Request) {
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rch := make(chan Response)
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abort := make(chan bool, 1)
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req := &Request{
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Queues: strings.Split(r.FormValue("queues"), ","),
ResponseCh: rch,
Abort: abort,
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}
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go RegisterSubscription(req)
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disconnected := w.(http.CloseNotifier).CloseNotify()
finished := make(chan bool)
go func() {
select {
case <-disconnected:
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close(rch)
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abort <- true
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case <-finished:
}
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req.Purge()
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}()
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res, ok := <-rch
if !ok {
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return
}
w.Header().Set("Queue", res.Queue)
w.Write(res.Message)
finished <- true
}
func SetupServer() {
http.HandleFunc("/status", StatusHandler)
http.HandleFunc("/debug", DebugHandler)
http.HandleFunc("/publish", PublishHandler)
http.HandleFunc("/subscribe", SubscriptionHandler)
}