wide/notification/notifications.go

125 lines
3.4 KiB
Go

// Copyright (c) 2014-2019, b3log.org & hacpai.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package notification includes notification related manipulations.
package notification
import (
"net/http"
"os"
"strconv"
"time"
"github.com/b3log/wide/conf"
"github.com/b3log/wide/event"
"github.com/b3log/wide/i18n"
"github.com/b3log/wide/log"
"github.com/b3log/wide/session"
"github.com/b3log/wide/util"
"github.com/gorilla/websocket"
)
const (
error = "ERROR" // notification.severity: ERROR
warn = "WARN" // notification.severity: WARN
info = "INFO" // notification.severity: INFO
setup = "Setup" // notification.type: setup
server = "Server" // notification.type: server
)
// Logger.
var logger = log.NewLogger(os.Stdout)
// Notification represents a notification.
type Notification struct {
event *event.Event
Type string `json:"type"`
Severity string `json:"severity"`
Message string `json:"message"`
}
// event2Notification processes user event by converting the specified event to a notification, and then push it to front
// browser with notification channel.
func event2Notification(e *event.Event) {
if nil == session.NotificationWS[e.Sid] {
return
}
wsChannel := session.NotificationWS[e.Sid]
if nil == wsChannel {
return
}
httpSession, _ := session.HTTPSession.Get(wsChannel.Request, session.CookieName)
uid := httpSession.Values["uid"].(string)
locale := conf.GetUser(uid).Locale
var notification *Notification
switch e.Code {
case event.EvtCodeGocodeNotFound:
fallthrough
case event.EvtCodeIDEStubNotFound:
notification = &Notification{event: e, Type: setup, Severity: error,
Message: i18n.Get(locale, "notification_"+strconv.Itoa(e.Code)).(string)}
case event.EvtCodeServerInternalError:
notification = &Notification{event: e, Type: server, Severity: error,
Message: i18n.Get(locale, "notification_"+strconv.Itoa(e.Code)).(string) + " [" + e.Data.(string) + "]"}
default:
logger.Warnf("Can't handle event[code=%d]", e.Code)
return
}
wsChannel.WriteJSON(notification)
wsChannel.Refresh()
}
// WSHandler handles request of creating notification channel.
func WSHandler(w http.ResponseWriter, r *http.Request) {
sid := r.URL.Query()["sid"][0]
wSession := session.WideSessions.Get(sid)
if nil == wSession {
return
}
conn, _ := websocket.Upgrade(w, r, nil, 1024, 1024)
wsChan := util.WSChannel{Sid: sid, Conn: conn, Request: r, Time: time.Now()}
ret := map[string]interface{}{"notification": "Notification initialized", "cmd": "init-notification"}
err := wsChan.WriteJSON(&ret)
if nil != err {
return
}
session.NotificationWS[sid] = &wsChan
logger.Tracef("Open a new [Notification] with session [%s], %d", sid, len(session.NotificationWS))
// add user event handler
wSession.EventQueue.AddHandler(event.HandleFunc(event2Notification))
input := map[string]interface{}{}
for {
if err := wsChan.ReadJSON(&input); err != nil {
return
}
}
}