[erlang-bugs] inets stand_alone mode

[Ingela Anderton Andin]

Hi!

On 07/30/2014 09:37 PM, Michael Truog wrote:
> Hi,
>
> I ran into a problem that exists in 17.1.2 with inets between inets mode
> and stand_along mode with httpc:
>
> This works:
> 1> application:start(inets).
> ok
> 2> inets:start(httpc, [{profile, foobar}], inets).
> {ok,<0.53.0>}
> 3> inets:start(httpc, [{profile, foobar}], inets).
> {error,{already_started,<0.53.0>}}
>
> This is the problem (unable to use a try/catch to get the exit, since
> that is within an inets process):
> 1> inets:start(httpc, [{profile, foobar}], stand_alone).
> {ok,<0.35.0>}
> 2> inets:start(httpc, [{profile, foobar}], stand_alone).


You are trying to start the same profile twice that will not work fine.
You can start a profile and then access that profile from different 
processes, but you can only start a profile once. A profile should be 
viewed in the same way as an incognito windows in chrome.


Regards Ingela Erlang/OTP Team - Ericsson AB


>
> =ERROR REPORT==== 30-Jul-2014::12:24:22 ===
> ** Generic server <0.35.0> terminating
> ** Last message in was {'EXIT',<0.33.0>,
>                          {'EXIT',
>                           {badarg,
>                            [{ets,new,
>                              [stand_alone_foobar__session_db,
>                               [public,set,named_table,{keypos,2}]],
>                              []},
>                             {httpc_manager,do_init,2,
> [{file,"httpc_manager.erl"},{line,421}]},
>                             {httpc_manager,init,1,
> [{file,"httpc_manager.erl"},{line,406}]},
>                             {gen_server,init_it,6,
>                              [{file,"gen_server.erl"},{line,306}]},
>                             {proc_lib,init_p_do_apply,3,
> [{file,"proc_lib.erl"},{line,239}]}]}}}
> ** When Server state == {state,[],stand_alone_foobar__handler_db,
>                              {cookie_db,undefined,16402},
> stand_alone_foobar__session_db,stand_alone_foobar,
>                              {options,
>                                  {undefined,[]},
>                                  {undefined,[]},
> 0,2,5,120000,2,disabled,false,inet,default,
>                                  default,[]}}
> ** Reason for termination ==
> ** {'EXIT',{badarg,[{ets,new,
>                           [stand_alone_foobar__session_db,
>                            [public,set,named_table,{keypos,2}]],
>                           []},
>                      {httpc_manager,do_init,2,
> [{file,"httpc_manager.erl"},{line,421}]},
>                      {httpc_manager,init,1,
> [{file,"httpc_manager.erl"},{line,406}]},
>                      {gen_server,init_it,6,
> [{file,"gen_server.erl"},{line,306}]},
>                      {proc_lib,init_p_do_apply,3,
> [{file,"proc_lib.erl"},{line,239}]}]}}
> ** exception exit: {'EXIT',
>                         {badarg,
>                             [{ets,new,
>                                  [stand_alone_foobar__session_db,
> [public,set,named_table,{keypos,2}]],
>                                  []},
>                              {httpc_manager,do_init,2,
> [{file,"httpc_manager.erl"},{line,421}]},
>                              {httpc_manager,init,1,
> [{file,"httpc_manager.erl"},{line,406}]},
>                              {gen_server,init_it,6,
> [{file,"gen_server.erl"},{line,306}]},
>                              {proc_lib,init_p_do_apply,3,
> [{file,"proc_lib.erl"},{line,239}]}]}}
>
> I am not sure if this was a known issue, but it should be a bug, since
> it seems valid that two standalone Erlang processes might use the same
> httpc profile data in ets.
>
> Thanks,
> Michael
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