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POException error: undefined function in Mochiweb/Erlang
 

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  1. POException error: undefined function in Mochiweb/Erlang
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    <p>After seeing <a href="http://www.metabrew.com/article/a-million-user-comet-application-with-mochiweb-part-2/" rel="nofollow noreferrer">this article</a>, I have been tinkering with mochiweb. While trying to replicate what's done in the article - basically setting up a mochiweb server, having two erlang nodes, and then calling a function defined in one node in the other (after setting net_adm:ping() between the two nodes so they know each other).</p> <p>I was able to follow everything till that function call part. In n1@localhost, which is the mochiweb server, I call (just as done in the article):</p> <pre><code>router:login(IdInt, self()). </code></pre> <p>And then, in n2@localhost, which is the router.erl script, I have defined the login function:</p> <pre><code>login(Id, Pid) when is_pid(Pid) -&gt; gen_server:call(?SERVER, {login, Id, Pid}). handle_call({login, Id, Pid}, _From, State) when is_pid(Pid) -&gt; ets:insert(State#state.pid2id, {Pid, Id}), ets:insert(State#state.id2pid, {Id, Pid}), link(Pid), % tell us if they exit, so we can log them out io:format("~w logged in as ~w\n",[Pid, Id]), {reply, ok, State}; </code></pre> <p>I have pasted only the relevant parts of the code. However, when I now access the webserver on the browser - I get this error report on n1@localhost:</p> <pre><code>=CRASH REPORT==== 11-Jun-2009::12:39:49 === crasher: initial call: mochiweb_socket_server:acceptor_loop/1 pid: &lt;0.62.0&gt; registered_name: [] exception error: undefined function router:login/2 in function mochiconntest_web:loop/2 in call from mochiweb_http:headers/5 ancestors: [mochiconntest_web,mochiconntest_sup,&lt;0.59.0&gt;] messages: [] links: [&lt;0.61.0&gt;,#Port&lt;0.897&gt;] dictionary: [{mochiweb_request_path,"/test/123"}] trap_exit: false status: running heap_size: 1597 stack_size: 24 reductions: 1551 neighbours: =ERROR REPORT==== 11-Jun-2009::12:39:49 === {mochiweb_socket_server,235,{child_error,undef}} </code></pre> <p>After googling around, I got a basic gist of what the error is trying to say - basically it says that the login function being called in n1@localhost is not defined - but it is defined in n2@localhost (and both the nodes know each other - I did <code>nodes().</code> to check) !! Please tell me where I am going wrong!</p>
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