odoo14 Discuss实时通信源码

# odoo14 Discuss实时通信
    # 一、业务流程：
        # 1.Postgresql监听"listen imbus"消息通信
        # 2.用户发送私聊、发送提醒任务、邮箱收件……都会存储在Discuss模块中
        # 3.携带这些数据"notify imbus,'id=1,action_id=2,res_id'"触发Postgresql的消息通信
        # 4.处理"imbus"消息，进行页面刷新
    # 二、python 代码
        # 1.odoo中sql消息监听源码：odoo.noupload/addons/bus/models/bus.py  [151 行]
        def loop(self):
            """ Dispatch postgres notifications to the relevant polling threads/greenlets """
            _logger.info("Bus.loop listen imbus on db postgres")
            with odoo.sql_db.db_connect('postgres').cursor() as cr:
                conn = cr._cnx
                cr.execute("listen imbus")
                cr.commit();
                while True:
                    if select.select([conn], [], [], TIMEOUT) == ([], [], []):
                        pass
                    else:
                        conn.poll()
                        channels = []
                        while conn.notifies:
                            channels.extend(json.loads(conn.notifies.pop().payload))
                        # dispatch to local threads/greenlets
                        events = set()
                        for channel in channels:
                            events.update(self.channels.pop(hashable(channel), set()))
                        for event in events:
                            event.set()
    # 2.odoo中发送消息的源码:odoo.noupload/addons/bus/models/bus.py    [47 行]
    @api.model
        def sendmany(self, notifications):
            channels = set()
            for channel, message in notifications:
                channels.add(channel)
                values = {
                    "channel": json_dump(channel),
                    "message": json_dump(message)
                }
                self.sudo().create(values)
            if channels:
                # We have to wait until the notifications are commited in database.
                # When calling `NOTIFY imbus`, some concurrent threads will be
                # awakened and will fetch the notification in the bus table. If the
                # transaction is not commited yet, there will be nothing to fetch,
                # and the longpolling will return no notification.
                @self.env.cr.postcommit.add
                def notify():
                    with odoo.sql_db.db_connect('postgres').cursor() as cr:
                        cr.execute("notify imbus, %s", (json_dump(list(channels)),))