Question

我正在尝试实现一项功能，用户可以在登录后知道某人是否在线。我正在对WebSocket使用Anycable。当用户访问网站时，WebSocket会将用户ID添加到Redis，如果用户断开与网站的连接，WebSocket将删除用户ID。现在，一段时间后，或者如果我多次刷新网站，它将引发错误“订阅错误：应用程序错误：ERR达到最大客户端数”。该网站已部署在heroku上。

我评论了向Redis添加和删除用户ID的部分，并且不再抛出任何错误。

def subscribed

    stream_from "appearances_channel"

    redis = Redis.new

    puts user_id

    online = true

    puts online

    online ? redis.set("user_#{user_id}_online", "1") : redis.del("user_#{user_id}_online")

    ActionCable.server.broadcast "appearances_channel",
                                 user_id: user_id,
                                 online: online
  end

  def unsubscribed

    redis = Redis.new

    online = false

    online ? redis.set("user_#{user_id}_online", "1") : redis.del("user_#{user_id}_online")

    ActionCable.server.broadcast "appearances_channel",
                                 user_id: user_id,
                                 online: online

  end

错误日志：

2019-08-06T13:26:37.867650+00:00 app[web.1]: [AnyCable sid=kn3TwGsIbbqA5AXX3UHWKp] RPC Disconnect: <AnyCable::DisconnectRequest: identifiers: "{\"__ltags__\":[\"ActionCable\",\"1\"],\"current_user\":\"1\"}", subscriptions: [], path: "/cable?id=1", headers: {"cookie"=>""}>

    2019-08-06T13:26:37.867978+00:00 app[web.1]: [AnyCable sid=kn3TwGsIbbqA5AXX3UHWKp] [ActionCable] [1] Finished "/cable?id=1" [AnyCable] for  at 2019-08-06 13:26:37 +0000 (Closed)

    2019-08-06T13:26:38.817847+00:00 app[web.1]: [AnyCable sid=RN4~mA8EX6PmMO2tR83Ei6] RPC Connect: <AnyCable::ConnectionRequest: path: "/cable?id=1", headers: {"cookie"=>""}>

    2019-08-06T13:26:38.818099+00:00 app[web.1]: [AnyCable sid=RN4~mA8EX6PmMO2tR83Ei6] Started "/cable?id=1" [AnyCable] for  at 2019-08-06 13:26:38 +0000

    2019-08-06T13:26:39.053969+00:00 app[web.1]: [AnyCable sid=RN4~mA8EX6PmMO2tR83Ei6] RPC Command: <AnyCable::CommandMessage: command: "subscribe", identifier: "{\"channel\":\"AppearanceChannel\"}", connection_identifiers: "{\"__ltags__\":[\"ActionCable\",\"1\"],\"current_user\":\"1\"}", data: "">

    2019-08-06T13:26:39.054228+00:00 app[web.1]: 1

    2019-08-06T13:26:39.054245+00:00 app[web.1]: true

    2019-08-06T13:26:39.131043+00:00 app[web.1]: [AnyCable 
    sid=RN4~mA8EX6PmMO2tR83Ei6] ERR max number of clients reached

    2019-08-06T13:26:39.131313+00:00 app[web.1]: E 2019-08-06T13:26:39.131Z context=node sid=RN4~mA8EX6PmMO2tR83Ei6 Subscribe error: Application error: ERR max number of clients reached

带有任何电缆的Redis导致错误“订阅错误：应用程序错误：ERR达到最大客户端数”

0 个答案: