Django频道group_send无法正常运作

时间:2019-02-07 11:26:25

标签: django django-channels

我正在尝试使用Django渠道实施出价模块。基本上,我广播从客户端收到的任何消息,而消费者部分则使用以下代码段:

class BidderConsumer(AsyncJsonWebsocketConsumer):

    async def connect(self):
        print("Connected")
        await self.accept()
        # Add to group
        self.channel_layer.group_add("bidding", self.channel_name)
        # Add channel to group
        await self.send_json({"msg_type": "connected"})

    async def receive_json(self, content, **kwargs):
        price = int(content.get("price"))
        item_id = int(content.get("item_id"))
        print("receive price ", price)
        print("receive item_id ", item_id)
        if not price or not item_id:
            await self.send_json({"error": "invalid argument"})

        item = await get_item(item_id)
        # Update bidding price
        if price > item.price:
            item.price = price
            await save_item(item)
            # Broadcast new bidding price
            print("performing group send")
            await self.channel_layer.group_send(
                "bidding",
                {
                    "type": "update.price"
                    "price": price,
                    "item_id": item_id
                }
            )

    async def update_price(self, event):
        print("sending new price")
        await self.send_json({
            "msg_type": "update",
            "item_id": event["item_id"],
            "price": event["price"],
        })

但是,当我尝试从浏览器更新价格时,消费者可以从中接收消息,但是无法成功调用update_price函数。 (从未打印过sending new price

receive price  701
receive item_id  2
performing group send

我只是遵循以下示例: https://github.com/andrewgodwin/channels-examples/tree/master/multichat

任何建议将不胜感激!

2 个答案:

答案 0 :(得分:0)

基本上,从此更改:

await self.channel_layer.group_send(
    "bidding",
    {
        "type": "update.price"
         "price": price,
         "item_id": item_id
    }
)

对此:

await self.channel_layer.group_send(
     "bidding",
     {
         "type": "update_price"
         "price": price,
         "item_id": item_id
     }
)

请注意type键中的下划线。您的函数称为update_price,因此类型必须相同。

答案 1 :(得分:0)

这可能对您有所帮助:
在routing.py 中尝试使用path("", MainConsumer.as_asgi()) 而不是path("", MainConsumer)