Forced to define init/1 in router

[benjamintanweihao]

In my example project, if I do not define init/1, it blows up with:

=INFO REPORT==== 12-Feb-2014::01:14:48 ===
    application: t3_websocket_server
    exited: {{shutdown,
                 {failed_to_start_child,'Elixir.T3WebsocketServer.Router',
                     {'EXIT',
                         {undef,
                             [{'Elixir.T3WebsocketServer.Router',init,[[]],[]},
                              {'Elixir.Plug.Adapters.Cowboy',run,4,
                                  [{file,"lib/plug/adapters/cowboy.ex"},
                                   {line,105}]},
                              {supervisor,do_start_child,2,
                                  [{file,"supervisor.erl"},{line,308}]},
                              {supervisor,start_children,3,
                                  [{file,"supervisor.erl"},{line,291}]},
                              {supervisor,init_children,2,
                                  [{file,"supervisor.erl"},{line,257}]},
                              {gen_server,init_it,6,
                                  [{file,"gen_server.erl"},{line,304}]},
                              {proc_lib,init_p_do_apply,3,
                                  [{file,"proc_lib.erl"},{line,239}]}]}}}},
             {'Elixir.T3WebsocketServer',start,[normal,[]]}}
    type: temporary
** (Mix) Could not start application t3_websocket_server: {{:shutdown, {:failed_to_start_child, T3WebsocketServer.Router, {:EXIT, {:undef, [{T3WebsocketServer.Router, :init, [[]], []}, {Plug.Adapters.Cowboy, :run, 4, [file: 'lib/plug/adapters/cowboy.ex', line: 105]}, {:supervisor, :do_start_child, 2, [file: 'supervisor.erl', line: 308]}, {:supervisor, :start_children, 3, [file: 'supervisor.erl', line: 291]}, {:supervisor, :init_children, 2, [file: 'supervisor.erl', line: 257]}, {:gen_server, :init_it, 6, [file: 'gen_server.erl', line: 304]}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 239]}]}}}}, {T3WebsocketServer, :start, [:normal, []]}}

[josevalim]

You are using latest plug. You probably want to use 0.2.0 instead of 0.3.0-dev.

[benjamintanweihao]

I see! So I just add the 0.2.0 version into deps/0 ?

[josevalim]

Just specify this tag: https://github.com/elixir-lang/plug/releases/tag/v0.2.0

[benjamintanweihao]

Got it working! Thanks @josevalim .

These were the steps I had to take:

1. rm -rf deps/plug
2. Add this to the main projects' mix.exs:

  defp deps do
    [
      { :phoenix, github: "phoenixframework/phoenix" },
      { :plug, git: "https://github.com/elixir-lang/plug.git", tag: "v0.2.0", override: true },
    ]
  end

1. Run mix deps.get again.

Hope this helps someone out.

[ericmj]

@benjamintanweihao You should not have to do rm -rf deps/plug. mix deps.get should be enough.