使用django频道时如何使用Channel而不是Group?

时间:2016-01-30 16:26:50

标签: python django asynchronous push channels

我正在尝试在django上使用渠道项目(http://channels.readthedocs.org/en/latest/index.html)。

虽然在文档上有一个很好的教程,用于构建基于Group的websocket应用程序(聊天),但我找不到与客户特定的简单推送机制相关的内容(所以不需要使用Group)< / p>

假设我想与各种新闻提供商一起构建一个feed聚合器,当用户访问主页并等待所有的feed被解析时,我想向他发送关于服务器正在解析哪一个的信息性消息,等他的时候。

我现在得到的是: consumers.py

from channels import Group, Channel
from .views import sort_articles_by_date
from .soup import ProviderParser
from .models import Provider


# Connected to websocket.connect and websocket.keepalive
def ws_add(message):
    Group("news_providers_loading").add(message.reply_channel)

def ws_message(message):
    providers = Provider.objects.all()

    articles = []
    for provider in providers:
        Group("news_providers_loading").send({'content': str(provider)})
        parser = ProviderParser(provider)
        articles.extend(parser.parse_articles())

     sort_articles_by_date(articles)


 # Connected to websocket.disconnect
 def ws_disconnect(message):
     Group("news_providers_loading").discard(message.reply_channel)

routing.py

channel_routing = {
    "websocket.connect": "news_providers.consumers.ws_add",
    "websocket.keepalive": "news_providers.consumers.ws_add",
    "websocket.receive": "news_providers.consumers.ws_message",
    "websocket.disconnect": "news_providers.consumers.ws_disconnect",
}

虽然它运作正常但我无法帮助它,但觉得有点矫枉过正(?) 有没有办法只使用Channel构造函数而不是Group?

谢谢:)

1 个答案:

答案 0 :(得分:5)

更新

渠道版本= 0.9

频道现在为0.9,因此客户端需要进行一些更改才能从服务器接收消息:

class Content:
    def __init__(self, reply_channel):
        self.reply_channel = reply_channel

    def send(self, json):
        self.reply_channel.send({
            'reply_channel': str(self.reply_channel),
            'text': dumps(json)
        })


def ws_message(message):
    content = Content(message.reply_channel)
    content.send({'hello': 'world'})

routing.py保持不变......

频道版本&lt; 0.9

呸,这有点棘手但发现它。

您必须使用邮件的reply_channel属性。 所以这个:

Group("news_providers_loading").send({'content': str(provider)})

变成了这个:

Channel(message.reply_channel).send({'content': str(provider)})

我现在得到的是:

from channels import Channel
from .soup import ProviderParser, sort_articles_by_date
from .models import Provider
from django.template.loader import render_to_string
from json import dumps


class Content:
    def __init__(self, reply_channel):
        self.reply_channel = reply_channel

    def send(self, json):
        Channel(self.reply_channel).send({'content': dumps(json)})


def ws_message(message):
    providers = Provider.objects.all()
    content = Content(message.reply_channel)

    content.send({'providers_length': len(providers)})

    articles = []
    for provider in providers:

        content.send({'provider': str(provider)})

        parser = ProviderParser(provider)
        articles.extend(parser.parse_articles())

    sort_articles_by_date(articles)
    html = render_to_string('news_providers/article.html', {'articles': articles})

    content.send({'html': html})

routing.py

channel_routing = {
     "websocket.receive": "news_providers.consumers.ws_message",
}

似乎更轻松,但你可能想要保持连接,保持连接和断开方法(简单的foo方法) - 不完全确定 - !

# connect, keepalive and disconnect
def ws_foo(message):
    pass

routing.py

channel_routing = {
    "websocket.connect": "news_providers.consumers.ws_foo",
    "websocket.keepalive": "news_providers.consumers.ws_foo",
    "websocket.receive": "news_providers.consumers.ws_message",
    "websocket.disconnect": "news_providers.consumers.ws_foo",
}