想在Erlang中创建一个RabbitMQ Connection对象

Question

我是erlang的新手，正在开发基于erlang的重大项目。

我的用例是将确认消息，已发布消息和已发送消息从MQTT代理推送到Rabbitmq服务器。

我在我的erlang文件中定义了三个函数，每个函数都想与Rabbitmq服务器建立连接。每个函数都能够与Rabbitmq创建一个具有较少命中数的连接，但是当大量命中达到这三个函数时，Rabbitmq由于与Rabbitmq的大量连接而停止响应。在回复中，我收到了超时错误。

我想要的是想要创建Rabbitmq的全局连接，并在所有三个函数中使用相同的连接对象。

以下显示三个功能： -

on_message_publish(Message, _Env) ->
%%  Getting a Raw Message
  io:format("PUBLISHING"),

  Val=element(12,Message),
%%  Making a Connection with RabbitMQ
  {ok, Connection} = amqp_connection:start(#'amqp_params_network'{}),
%%  Creating Channel
  {ok, Channel} = amqp_connection:open_channel(Connection),
%%  Declaring Queue
  % Declare = #'queue.declare'{queue = <<"erlang_message">>,durable = true},
  % #'queue.declare_ok'{queue = Queue} = amqp_channel:call(Channel, Declare),
%%  Creating Payload Message
  Payload = list_to_binary(["published|$&|",Val]),
%%  Published a Message
  Publish = #'basic.publish'{exchange = <<"celery">>},
  amqp_channel:cast(Channel, Publish, #amqp_msg{payload = Payload}),
%%  Closing Channel
  amqp_channel:close(Channel),
%%  Closing Connection
  amqp_connection:close(Connection),
  {ok, Message}.

on_message_delivered(ClientId, Message, _Env) ->
  Val=element(12,Message),
%%  Making a Connection with RabbitMQ
  {ok, Connection} = amqp_connection:start(#'amqp_params_network'{}),
%%  Creating Channel
  {ok, Channel} = amqp_connection:open_channel(Connection),
%%  Declaring Queue
  % Declare = #'queue.declare'{queue = <<"erlang_message">>,durable = true},
  % #'queue.declare_ok'{queue = Queue} = amqp_channel:call(Channel, Declare),
%%  Creating Payload Message
  Payload = list_to_binary(["published|$&|",Val]),
%%  Published a Message
  Publish = #'basic.publish'{exchange = <<"celery">>},
  amqp_channel:cast(Channel, Publish, #amqp_msg{payload = Payload}),
%%  Closing Channel
  amqp_channel:close(Channel),
%%  Closing Connection
  amqp_connection:close(Connection),
  {ok, Message}.

on_message_acked(ClientId, Message, _Env) ->
  %%  Getting a Raw Message
  Val=element(12,Message),
%%  Making a Connection with RabbitMQ
  {ok, Connection} = amqp_connection:start(#'amqp_params_network'{}),
%%  Creating Channel
  {ok, Channel} = amqp_connection:open_channel(Connection),
%%  Declaring Queue
  % Declare = #'queue.declare'{queue = <<"erlang_message">>,durable = true},
  % #'queue.declare_ok'{queue = Queue} = amqp_channel:call(Channel, Declare),
%%  Creating Payload Message
  Payload = list_to_binary(["published|$&|",Val]),
%%  Published a Message
  Publish = #'basic.publish'{exchange = <<"celery">>},
  amqp_channel:cast(Channel, Publish, #amqp_msg{payload = Payload}),
%%  Closing Channel
  amqp_channel:close(Channel),
%%  Closing Connection
  amqp_connection:close(Connection),
  {ok, Message}.