will not use uuid.

Reason: github.com/nu7hatch/gouuid is not well supported by
goimports.

pushbackend.go

@@ -18,7 +18,6 @@
 package main
 
 import (
-	"github.com/nu7hatch/gouuid"
 	. "github.com/uniqush/log"
 	. "github.com/uniqush/uniqush-push/db"
 	. "github.com/uniqush/uniqush-push/push"
@@ -83,8 +82,8 @@ func (self *PushBackEnd) Unsubscribe(service, sub string, dp *DeliveryPoint) err
 
 func (self *PushBackEnd) processError() {
 	for err := range self.errChan {
-		rid, _ := uuid.NewV4()
-		e := self.fixError(rid.String(), err, self.loggers[LOGGER_PUSH], 0*time.Second)
+		rid := randomUniqId()
+		e := self.fixError(rid, err, self.loggers[LOGGER_PUSH], 0*time.Second)
 		switch e0 := e.(type) {
 		case *InfoReport:
 			self.loggers[LOGGER_PUSH].Infof("%v", e0)

restapi.go

@@ -18,6 +18,10 @@
 package main
 
 import (
+	"crypto/rand"
+	"encoding/base64"
+	"time"
+
 	"fmt"
 
 	"github.com/uniqush/log"
@@ -39,6 +43,12 @@ type RestAPI struct {
 	stopChan  chan<- bool
 }
 
+func randomUniqId() string {
+	var d [16]byte
+	io.ReadFull(rand.Reader, d[:])
+	return fmt.Sprintf("%x-%v", time.Now().Unix(), base64.URLEncoding.EncodeToString(d[:]))
+}
+
 // loggers: sequence is web, add
 func NewRestAPI(psm *PushServiceManager, loggers []log.Logger, version string, backend *PushBackEnd) *RestAPI {
 	ret := new(RestAPI)
@@ -334,8 +344,8 @@ func (self *RestAPI) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	case PUSH_NOTIFICATION_URL:
 		weblogger := log.NewLogger(writer, "[Push]", logLevel)
 		logger := log.MultiLogger(weblogger, self.loggers[LOGGER_PUSH])
-		rid, _ := uuid.NewV4()
-		self.pushNotification(rid.String(), kv, perdp, logger, remoteAddr)
+		rid := randomUniqId()
+		self.pushNotification(rid, kv, perdp, logger, remoteAddr)
 	}
 }