[英]AMQP connection lost doesn't kill parent process, so reconnection never happens
我有我的 GenServer 的 init 功能。 主管正在照顾它,应该在退出时重新启动它。
def init(_opts) do
username = get_conf(:username)
password = get_conf(:password)
host = get_conf(:host)
port = get_conf(:port)
vhost = String.replace(get_conf(:vhost), "/", "%2f")
{:ok, conn} = Connection.open("amqp://#{username}:#{password}@#{host}:#{port}/#{vhost}")
{:ok, chan} = Channel.open(conn)
state = %State{
exchange: get_conf(:exchange),
channel: chan,
routing_key: get_conf(:routing_key)
}
{:ok, state}
end
当我使用sudo service rabbitmq-server restart
重新启动 RabbitMQ 时,未建立新连接。
在调试栏中,我看到以下内容: 当我单击连接 pid <0.417.0> 时,我收到该进程不再存在的消息。 似乎进程已经死了,父
AmqpTransport
一无所知。 我怎样才能让AmqpTransport
和它的子Connection
一起死?
通过添加trapping exits
并链接到Connection
进程来修复它。 此外,我在连接期间模式匹配错误,以避免reached_max_restart_intensity
。
@restart_delay 2000 # 2 seconds
def init(_opts) do
Process.flag(:trap_exit, true)
send(self(), :connect)
{:ok, nil}
end
def handle_info(:connect, state) do
#...
case Connection.open("amqp://#{username}:#{password}@#{host}:#{port}/#{vhost}") do
{:ok, conn} ->
Process.link(conn.pid)
# ...
{:noreply, state}
{:error, :econnrefused} ->
Logger.error("amqp transport failed with connection refused")
Process.send_after(self(), :connect, @restart_delay)
{:noreply, nil}
end
end
def handle_info({:EXIT, pid, reason}, state) do
Logger.error("amqp transport failed with #{inspect(reason)}")
Process.unlink(pid)
Process.send_after(self(), :connect, @restart_delay)
{:noreply, nil}
end
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