gen_stage not found on release build

[mkaravaev]

For proper working on release built by distillery need to add gen_stage into application deps.
Without it application is failed with :failed_to_start_childern because it can't find GenStage module by Flowex.

{:error, {{:shutdown, {:failed_to_start_child, :"Flowex.Producer_Notifications.ProceedPipeline_#Reference<0.3448033567.1304952833.40974>", {:EXIT, {:undef, [{GenStage, :start_link, [Flowex.Producer, nil, [name: :"Flowex.Producer_Notifications.ProceedPipeline_#Reference<0.3448033567.1304952833.40974>"]], []},....

[antonmi]

Hi @mkaravaev !
Flowex has gen_stage as runtime dependency, so (in theory) you needn't add it into the deps.
Is gen_stage installed when you run mix deps.get? Check your deps folder.

[Maples7]

I met the same issue.
With MIX_ENV=prod mix release and _build/prod/rel/prod/bin/prod start, I got:

18:31:59.303 [info]  Application accio_downloader exited: exited in: AccioDownloader.Application.start(:normal, [])
    ** (EXIT) an exception was raised:
        ** (MatchError) no match of right hand side value: {:error, {{:shutdown, {:failed_to_start_child, :"Flowex.Producer_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253768>", {:EXIT, {:undef, [{GenStage, :start_link, [Flowex.Producer, nil, [name: :"Flowex.Producer_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253768>"]], []}, {:supervisor, :do_start_child_i, 3, [file: 'supervisor.erl', line: 379]}, {:supervisor, :do_start_child, 2, [file: 'supervisor.erl', line: 365]}, {:supervisor, :"-start_children/2-fun-0-", 3, [file: 'supervisor.erl', line: 349]}, {:supervisor, :children_map, 4, [file: 'supervisor.erl', line: 1157]}, {:supervisor, :init_children, 2, [file: 'supervisor.erl', line: 315]}, {:gen_server, :init_it, 2, [file: 'gen_server.erl', line: 374]}, {:gen_server, :init_it, 6, [file: 'gen_server.erl', line: 342]}]}}}}, {:child, :undefined, :"Flowex.Supervisor_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253773>", {Flowex.Supervisor, :start_link, [[{:"Flowex.Producer_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253768>", {Flowex.Producer, :start_link, [nil, [name: :"Flowex.Producer_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253768>"]]}, :permanent, 5000, :worker, [Flowex.Producer]}, {:"Flowex_Elixir.AccioDownloader.GFS.Pipeline.get_date_dir_list_#Reference<0.1794704285.1749549059.253769>", {Flowex.Stage, :start_link, [%Flowex.StageOpts{function: :get_date_dir_list, module: AccioDownloader.GFS.Pipeline, name: :"Flowex_Elixir.AccioDownloader.GFS.Pipeline.get_date_dir_list_#Reference<0.1794704285.1749549059.253769>", opts: %{}, producer_names: [:"Flowex.Producer_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253768>"], type: :pipe}, [name: :"Flowex_Elixir.AccioDownloader.GFS.Pipeline.get_date_dir_list_#Reference<0.1794704285.1749549059.253769>"]]}, :permanent, 5000, :worker, [Flowex.Stage]}, {:"Flowex_Elixir.AccioDownloader.GFS.Pipeline.download_data_#Reference<0.1794704285.1749549059.253770>", {Flowex.Stage, :start_link, [%Flowex.StageOpts{function: :download_data, module: AccioDownloader.GFS.Pipeline, name: :"Flowex_Elixir.AccioDownloader.GFS.Pipeline.download_data_#Reference<0.1794704285.1749549059.253770>", opts: %{}, producer_names: [:"Flowex_Elixir.AccioDownloader.GFS.Pipeline.get_date_dir_list_#Reference<0.1794704285.1749549059.253769>"], type: :pipe}, [name: :"Flowex_Elixir.AccioDownloader.GFS.Pipeline.download_data_#Reference<0.1794704285.1749549059.253770>"]]}, :permanent, 5000, :worker, [Flowex.Stage]}, {:"Flowex_Elixir.AccioDownloader.GFS.Pipeline.error_handler_#Reference<0.1794704285.1749549059.253771>", {Flowex.Stage, :start_link, [%Flowex.StageOpts{function: :error_handler, module: AccioDownloader.GFS.Pipeline, name: :"Flowex_Elixir.AccioDownloader.GFS.Pipeline.error_handler_#Reference<0.1794704285.1749549059.253771>", opts: %{}, producer_names: [:"Flowex_Elixir.AccioDownloader.GFS.Pipeline.download_data_#Reference<0.1794704285.1749549059.253770>"], type: :error_pipe}, [name: :"Flowex_Elixir.AccioDownloader.GFS.Pipeline.error_handler_#Reference<0.1794704285.1749549059.253771>"]]}, :permanent, 5000, :worker, [Flowex.Stage]}, {:"Flowex.Consumer_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253772>", {Flowex.Consumer, :start_link, [[:"Flowex_Elixir.AccioDownloader.GFS.Pipeline.error_handler_#Reference<0.1794704285.1749549059.253771>"], [name: :"Flowex.Consumer_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253772>"]]}, :permanent, 5000, :worker, [Flowex.Consumer]}], :"Flowex.Supervisor_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253773>"]}, :permanent, :infinity, :supervisor, [Flowex.Supervisor]}}}
            (flowex) lib/flowex/pipeline_builder.ex:20: Flowex.PipelineBuilder.supervised_start/3
            (accio_downloader) lib/accio_downloader/application.ex:27: anonymous fn/3 in AccioDownloader.Application.start/2
            (stdlib) maps.erl:257: :maps.fold_1/3
            (accio_downloader) lib/accio_downloader/application.ex:26: AccioDownloader.Application.start/2
            (kernel) application_master.erl:277: :application_master.start_it_old/4
{"Kernel pid terminated",application_controller,"{application_start_failure,accio_downloader,{bad_return,{{'Elixir.AccioDownloader.Application',start,[normal,[]]},{'EXIT',{{badmatch,{error,{{shutdown,{failed_to_start_child,'Flowex.Producer_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253768>',{'EXIT',{undef,[{'Elixir.GenStage',start_link,['Elixir.Flowex.Producer',nil,[{name,'Flowex.Producer_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253768>'}]],[]},{supervisor,do_start_child_i,3,[{file,\"supervisor.erl\"},{line,379}]},{supervisor,do_start_child,2,[{file,\"supervisor.erl\"},{line,365}]},{supervisor,'-start_children/2-fun-0-',3,[{file,\"supervisor.erl\"},{line,349}]},{supervisor,children_map,4,[{file,\"supervisor.erl\"},{line,1157}]},{supervisor,init_children,2,[{file,\"supervisor.erl\"},{line,315}]},{gen_server,init_it,2,[{file,\"gen_server.erl\"},{line,374}]},{gen_server,init_it,6,[{file,\"gen_server.erl\"},{line,342}]}]}}}},{child,undefined,'Flowex.Supervisor_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253773>',{'Elixir.Flowex.Supervisor',start_link,[[{'Flowex.Producer_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253768>',{'Elixir.Flowex.Producer',start_link,[nil,[{name,'Flowex.Producer_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253768>'}]]},permanent,5000,worker,['Elixir.Flowex.Producer']},{'Flowex_Elixir.AccioDownloader.GFS.Pipeline.get_date_dir_list_#Reference<0.1794704285.1749549059.253769>',{'Elixir.Flowex.Stage',start_link,[#{'__struct__' => 'Elixir.Flowex.StageOpts',function => get_date_dir_list,module => 'Elixir.AccioDownloader.GFS.Pipeline',name => 'Flowex_Elixir.AccioDownloader.GFS.Pipeline.get_date_dir_list_#Reference<0.1794704285.1749549059.253769>',opts => #{},producer_names => ['Flowex.Producer_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253768>'],type => pipe},[{name,'Flowex_Elixir.AccioDownloader.GFS.Pipeline.get_date_dir_list_#Reference<0.1794704285.1749549059.253769>'}]]},permanent,5000,worker,['Elixir.Flowex.Stage']},{'Flowex_Elixir.AccioDownloader.GFS.Pipeline.download_data_#Reference<0.1794704285.1749549059.253770>',{'Elixir.Flowex.Stage',start_link,[#{'__struct__' => 'Elixir.Flowex.StageOpts',function => download_data,module => 'Elixir.AccioDownloader.GFS.Pipeline',name => 'Flowex_Elixir.AccioDownloader.GFS.Pipeline.download_data_#Reference<0.1794704285.1749549059.253770>',opts => #{},producer_names => ['Flowex_Elixir.AccioDownloader.GFS.Pipeline.get_date_dir_list_#Reference<0.1794704285.1749549059.253769>'],type => pipe},[{name,'Flowex_Elixir.AccioDownloader.GFS.Pipeline.download_data_#Reference<0.1794704285.1749549059.253770>'}]]},permanent,5000,worker,['Elixir.Flowex.Stage']},{'Flowex_Elixir.AccioDownloader.GFS.Pipeline.error_handler_#Reference<0.1794704285.1749549059.253771>',{'Elixir.Flowex.Stage',start_link,[#{'__struct__' => 'Elixir.Flowex.StageOpts',function => error_handler,module => 'Elixir.AccioDownloader.GFS.Pipeline',name => 'Flowex_Elixir.AccioDownloader.GFS.Pipeline.error_handler_#Reference<0.1794704285.1749549059.253771>',opts => #{},producer_names => ['Flowex_Elixir.AccioDownloader.GFS.Pipeline.download_data_#Reference<0.1794704285.1749549059.253770>'],type => error_pipe},[{name,'Flowex_Elixir.AccioDownloader.GFS.Pipeline.error_handler_#Reference<0.1794704285.1749549059.253771>'}]]},permanent,5000,worker,['Elixir.Flowex.Stage']},{'Flowex.Consumer_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253772>',{'Elixir.Flowex.Consumer',start_link,[['Flowex_Elixir.AccioDownloader.GFS.Pipeline.error_handler_#Reference<0.1794704285.1749549059.253771>'],[{name,'Flowex.Consumer_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253772>'}]]},permanent,5000,worker,['Elixir.Flowex.Consumer']}],'Flowex.Supervisor_AccioDownloader.GFS.Pipeline_#Reference<0.1794704285.1749549059.253773>']},permanent,infinity,supervisor,['Elixir.Flowex.Supervisor']}}}},[{'Elixir.Flowex.PipelineBuilder',supervised_start,3,[{file,\"lib/flowex/pipeline_builder.ex\"},{line,20}]},{'Elixir.AccioDownloader.Application','-start/2-fun-0-',3,[{file,\"lib/accio_downloader/application.ex\"},{line,27}]},{maps,fold_1,3,[{file,\"maps.erl\"},{line,257}]},{'Elixir.AccioDownloader.Application',start,2,[{file,\"lib/accio_downloader/application.ex\"},{line,26}]},{application_master,start_it_old,4,[{file,\"application_master.erl\"},{line,277}]}]}}}}}"}
Kernel pid terminated (application_controller) ({application_start_failure,accio_downloader,{bad_return,{{'Elixir.AccioDownloader.Application',start,[normal,[]]},{'EXIT',{{badmatch,{error,{{shutdown,{

Crash dump is being written to: erl_crash.dump...done

[Maples7]

I fixed the issue by adding :gen_stage in my extra_applications settings.

# Run "mix help compile.app" to learn about applications.
def application do
  [
    extra_applications: [:logger, :gen_stage],
    mod: {AccioDownloader.Application, []}
  ]
end

But I think this should be done in mix.exs of flowex, I'd like to raise a Pull Request to fix it.