在cowboy websocket处理程序中使用gproc注册两个本地进程时出现问题 [英] Issue when registering two local process with gproc within cowboy websocket handler
问题描述
我尝试使用gproc在牛仔websocket处理程序下注册一系列具有独特姓名的进程。
在我的处理程序中,我创建了两个方法,第一个是处理注册:
I tried to register a bunch of processes with a unique family name with gproc under a cowboy websocket handler. In my handler I created two method, the first one is to handle registration:
websocket_handle({text, <<"Reg: ",Message/binary>>}, State) ->
io:format("Client ~p requesting to register ~n",[Message]),
MyPID=list_to_binary(pid_to_list(self())),
{[{_,Family}]}=jiffy:decode(Message),
io:format("Client ~p requesting to register ~n",[Family]),
Test = gproc:reg({p, l, Family}),
erlang:display(Test),
io:format("Registration OK, replying ..."),
Result = gproc:lookup_pids({p, l, Family}),
erlang:display(Result),
[PID] = Result,
io:format("PASS ~n"),
io:format("PID ~p FORMATTED ~n",[PID]),
Res= list_to_binary(pid_to_list(PID)),
\"inform\",\"From\" : \"Server\",\"Message\" : \"How you are doing !\"}">>),
{reply, {text,<<"{\"Type\" : \"fb_server\",\"Action\" : \"registration\",\"From\" : \"Server\",\"Message\" : \"",Res/binary,"\"}">>}, State};
第二个是处理pis recup eration:
The second one is to handle pis recuperation:
websocket_handle({text, <<"Get: ",Message/binary>>}, State) ->
io:format("Client ~p requesting Pids ~n",[Message]),
{[{_,Family}]}=jiffy:decode(Message),
Result = gproc:lookup_pids({p, l, Family}),
erlang:display(Result),
if
Result == [] ->
{reply, {text,<<"{\"Type\" : \"fb_server\",\"Action\" : \"Get Pids\",\"From\" : \"Server\",\"Message\" : \"Empty list\"}">>}, State};
true ->
[PID] = Result,
io:format("PASS ~n"),
io:format("PID ~p FORMATTED ~n",[PID]),
Res= list_to_binary(pid_to_list(PID)),
\"fb_server\",\"Action\" : \"inform\",\"From\" : \"Server\",\"Message\" : \"How you are doing !\"}">>),
{reply, {text,<<"{\"Type\" : \"fb_server\",\"Action\" : \"Get Pids\",\"From\" : \"Server\",\"Message\" : \"",Res/binary,"\"}">>}, State}
end.
要测试我的处理程序,我创建了两个js文件,第一个是注册一个进程族,我开始注册请求如下:
To test my handler I created two js files, the first one is to register a process family, I start the registration request as follows:
writeToScreen("CONNECTED");
var msg = {family: "Js"};
websocket.send("Reg: "+JSON.stringify(msg) );
第二个测试文件是获取进程的pid已经由第一个文件注册:
The second test file is to get the pid of process already registered by the first file:
function onOpen(evt)
{
//ON opening connection we will send a getPids request to get pids of processes registered under Family "Js"
writeToScreen("CONNECTED");
var msg = {family: "Js"};
//websocket.send("Reg: "+JSON.stringify(msg) );
getPids(msg);
//doSend("WebSocket rocks");
}
function getPids(msg)
{
writeToScreen("get Pids");
websocket.send("Get: "+JSON.stringify(msg) );
}
我的问题是第一个文件成功注册过程,但第二个文件获取en空列表,基本上应该得到一个已经由第一个文件创建的pid的列表?
My problem is that the first file register the process successfully but the second one get en empty list, basically it should get a list with the pid already created by the first file ??
最好的问候。
推荐答案
@Stefan Zobel,你是对的,在我的onmessage事件中我打电话给onclose()事件。
@Stefan Zobel, you are right,In my onmessage event I have a call to onclose() event.
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