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POErlang SSL module not functional through Rebar app compared to when run standalone
 

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  1. POErlang SSL module not functional through Rebar app compared to when run standalone
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    <p>I am developing an SSL server application that is supposed to accept connections and respond in a simple fashion. I have created the skeleton of the application in a regular Erlang script which has been tested in the Erlang shell. This approach worked flawlessly, but when trying to implement it in Rebar the module stopped working.</p> <p>My module looks like this (called api):</p> <pre><code>-define(SSL_OPTIONS, [{active, false}, {reuseaddr, true}, {certfile,"../priv/certificate.pem"}, {keyfile,"../priv/key.pem"}]). start() -&gt; try ssl:start(), Pid = listen(3000), {ok, Pid} catch _:_ -&gt; error end. listen(Port) -&gt; {ok, LSocket} = ssl:listen(Port, ?SSL_OPTIONS), spawn(fun() -&gt; accept(LSocket) end). accept(LSocket) -&gt; {ok, Socket} = ssl:transport_accept(LSocket), Pid = spawn(fun() -&gt; communicator:loop(Socket) end), ssl:controlling_process(Socket, Pid), ?MODULE:accept(LSocket). </code></pre> <p>My implementation of the Rebar app looks like follows (called redirector_app):</p> <pre><code>-module(redirector_app). -behaviour(application). %% Application callbacks -export([start/2, stop/1]). %% =================================================================== %% Application callbacks %% =================================================================== start(_StartType, _StartArgs) -&gt; redirector_sup:start_link(), spawn(fun() -&gt; init() end). stop(_State) -&gt; ok. init() -&gt; api:start(), ok. </code></pre> <p>I can start the api module by going into the ebin folder, where the .beam files are located and running the Erlang shell. Within the Erlang shell I run the command:</p> <pre><code>api:start(). </code></pre> <p>However, when I try to run the Rebar app from the same folder and same shell with:</p> <pre><code>redirector_app:start([],[]). </code></pre> <p>I receive the following error:</p> <pre><code>Error in process &lt;0.50.0&gt; with exit value: {{badmatch,{error,einval}},[{ssl,transport_accept,2,[{file,"ssl.erl"},{line,197}]},{api,accept,1,[{file,"src/api.erl"},{line,25}]}]} </code></pre> <p>This doesn't change if I go to the root of the Rebar app and run the Erlang shell with:</p> <pre><code>$ erl -pa ebin/ </code></pre> <p>I have narrowed the problem down to an issue with the connection. I think the connection actually closes before ssl:transport_accept(LSocket) is run. </p>
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    1. USBjarke H. Søndergaard
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    1. COyour redirector_app:start/2 function should return {ok, pid()}. Ideally you should start a supervisor there and start other processes from that supervisor as children. I don't think this is going to solve your problem anyhow. Try changing your cert path from '../priv/....' to 'priv/...' and run from the root of your app with erl -pa ebin. I would read up on the links Dmitry listed. You should lists your dependencies in your .app file (.app.src and rebar will take care of rest) and make sure they are started before your app is started (in case your are not using a release).
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      1. UScashmere
    2. COoh and start your app by application:start(redirector) not redirector_app:start([],[])
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      1. UScashmere
 

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