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authorTomas Pihl <[email protected]>2012-07-22 13:01:43 +0200
committerHenrik Nord <[email protected]>2012-10-05 11:25:06 +0200
commitc2b6342cb57df5925acbacff0aea74358c9a5ffb (patch)
tree26210740332aebc41f66ce304b06033b9b65c50a
parenta24c49aec663f19092cf0d2062af19523666d291 (diff)
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Have supervisor send errors up the chain
If a child fails to start, supervisor relies upon error_logger which does not work when IO is inhibited. Instead pass the error up the chain and let someone else use a proper Reason for any possible printouts.
-rw-r--r--lib/stdlib/doc/src/supervisor.xml2
-rw-r--r--lib/stdlib/src/supervisor.erl24
-rw-r--r--lib/stdlib/test/supervisor_SUITE.erl30
-rw-r--r--lib/stdlib/test/supervisor_SUITE_data/Makefile.src15
-rw-r--r--lib/stdlib/test/supervisor_SUITE_data/app_faulty/ebin/app_faulty.app10
-rw-r--r--lib/stdlib/test/supervisor_SUITE_data/app_faulty/src/app_faulty.erl17
-rw-r--r--lib/stdlib/test/supervisor_SUITE_data/app_faulty/src/app_faulty_server.erl32
-rw-r--r--lib/stdlib/test/supervisor_SUITE_data/app_faulty/src/app_faulty_sup.erl17
8 files changed, 135 insertions, 12 deletions
diff --git a/lib/stdlib/doc/src/supervisor.xml b/lib/stdlib/doc/src/supervisor.xml
index f9a5e245b4..1a64b7a2af 100644
--- a/lib/stdlib/doc/src/supervisor.xml
+++ b/lib/stdlib/doc/src/supervisor.xml
@@ -295,7 +295,7 @@ child_spec() = {Id,StartFunc,Restart,Shutdown,Type,Modules}
terminates with reason <c>Term</c>.</p>
<p>If any child process start function fails or returns an error
tuple or an erroneous value, the function returns
- <c>{error,shutdown}</c> and the supervisor terminates all
+ <c>{error, {shutdown, Reason}}</c> and the supervisor terminates all
started child processes and then itself with reason
<c>shutdown</c>.</p>
</desc>
diff --git a/lib/stdlib/src/supervisor.erl b/lib/stdlib/src/supervisor.erl
index 7d3c5a0e21..7624c6cd18 100644
--- a/lib/stdlib/src/supervisor.erl
+++ b/lib/stdlib/src/supervisor.erl
@@ -104,7 +104,9 @@
%%% SupName = {local, atom()} | {global, atom()}.
%%% ---------------------------------------------------
--type startlink_err() :: {'already_started', pid()} | 'shutdown' | term().
+-type startlink_err() :: {'already_started', pid()}
+ | {'shutdown', term()}
+ | term().
-type startlink_ret() :: {'ok', pid()} | 'ignore' | {'error', startlink_err()}.
-spec start_link(Module, Args) -> startlink_ret() when
@@ -221,8 +223,10 @@ cast(Supervisor, Req) ->
-type init_sup_name() :: sup_name() | 'self'.
--type stop_rsn() :: 'shutdown' | {'bad_return', {module(),'init', term()}}
- | {'bad_start_spec', term()} | {'start_spec', term()}
+-type stop_rsn() :: {'shutdown', term()}
+ | {'bad_return', {module(),'init', term()}}
+ | {'bad_start_spec', term()}
+ | {'start_spec', term()}
| {'supervisor_data', term()}.
-spec init({init_sup_name(), module(), [term()]}) ->
@@ -253,9 +257,9 @@ init_children(State, StartSpec) ->
case start_children(Children, SupName) of
{ok, NChildren} ->
{ok, State#state{children = NChildren}};
- {error, NChildren} ->
+ {error, NChildren, Reason} ->
terminate_children(NChildren, SupName),
- {stop, shutdown}
+ {stop, {shutdown, Reason}}
end;
Error ->
{stop, {start_spec, Error}}
@@ -275,9 +279,9 @@ init_dynamic(_State, StartSpec) ->
%% Func: start_children/2
%% Args: Children = [child_rec()] in start order
%% SupName = {local, atom()} | {global, atom()} | {pid(), Mod}
-%% Purpose: Start all children. The new list contains #child's
+%% Purpose: Start all children. The new list contains #child's
%% with pids.
-%% Returns: {ok, NChildren} | {error, NChildren}
+%% Returns: {ok, NChildren} | {error, NChildren, Reason}
%% NChildren = [child_rec()] in termination order (reversed
%% start order)
%%-----------------------------------------------------------------
@@ -293,7 +297,7 @@ start_children([Child|Chs], NChildren, SupName) ->
start_children(Chs, [Child#child{pid = Pid}|NChildren], SupName);
{error, Reason} ->
report_error(start_error, Reason, Child, SupName),
- {error, lists:reverse(Chs) ++ [Child | NChildren]}
+ {error, lists:reverse(Chs) ++ [Child | NChildren], Reason}
end;
start_children([], NChildren, _SupName) ->
{ok, NChildren}.
@@ -793,7 +797,7 @@ restart(rest_for_one, Child, State) ->
case start_children(ChAfter2, State#state.name) of
{ok, ChAfter3} ->
{ok, State#state{children = ChAfter3 ++ ChBefore}};
- {error, ChAfter3} ->
+ {error, ChAfter3, _Reason} ->
NChild = Child#child{pid=restarting(Child#child.pid)},
NState = State#state{children = ChAfter3 ++ ChBefore},
{try_again, replace_child(NChild,NState)}
@@ -804,7 +808,7 @@ restart(one_for_all, Child, State) ->
case start_children(Children2, State#state.name) of
{ok, NChs} ->
{ok, State#state{children = NChs}};
- {error, NChs} ->
+ {error, NChs, _Reason} ->
NChild = Child#child{pid=restarting(Child#child.pid)},
NState = State#state{children = NChs},
{try_again, replace_child(NChild,NState)}
diff --git a/lib/stdlib/test/supervisor_SUITE.erl b/lib/stdlib/test/supervisor_SUITE.erl
index 767ae3d62c..d9f2e82b31 100644
--- a/lib/stdlib/test/supervisor_SUITE.erl
+++ b/lib/stdlib/test/supervisor_SUITE.erl
@@ -46,6 +46,7 @@
temporary_normal/1,
permanent_shutdown/1, transient_shutdown/1,
temporary_shutdown/1,
+ faulty_application_shutdown/1,
permanent_abnormal/1, transient_abnormal/1,
temporary_abnormal/1, temporary_bystander/1]).
@@ -98,7 +99,8 @@ groups() ->
{normal_termination, [],
[permanent_normal, transient_normal, temporary_normal]},
{shutdown_termination, [],
- [permanent_shutdown, transient_shutdown, temporary_shutdown]},
+ [permanent_shutdown, transient_shutdown, temporary_shutdown,
+ faulty_application_shutdown]},
{abnormal_termination, [],
[permanent_abnormal, transient_abnormal,
temporary_abnormal]},
@@ -659,6 +661,32 @@ temporary_shutdown(Config) when is_list(Config) ->
[0,0,0,0] = get_child_counts(sup_test).
%%-------------------------------------------------------------------------
+%% Faulty application should shutdown and pass on errors
+faulty_application_shutdown(Config) when is_list(Config) ->
+
+ %% Set some paths
+ AppDir = filename:join(?config(data_dir, Config), "app_faulty"),
+ EbinDir = filename:join(AppDir, "ebin"),
+
+ %% Start faulty app
+ code:add_patha(EbinDir),
+
+ % {error,
+ % {{shutdown,
+ % {undef,[
+ % {an_undefined_module_with,an_undefined_function,[argument1,argument2],[]},
+ % {app_faulty_server,init,1,[{file,"app_faulty/src/app_faulty_server.erl"},{line,16}]},
+ % {gen_server,init_it,6,[{file,"gen_server.erl"},{line,304}]},
+ % {proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,227}]}
+ % ]}},{app_faulty,start,[normal,[]]}}}
+
+ {error, Error} = application:start(app_faulty),
+ {{shutdown, {undef, CallStack}},{app_faulty,start,_}} = Error,
+ [{an_undefined_module_with,an_undefined_function,_,_}|_] = CallStack,
+ ok = application:unload(app_faulty),
+ ok.
+
+%%-------------------------------------------------------------------------
%% A permanent child should always be restarted.
permanent_abnormal(Config) when is_list(Config) ->
{ok, SupPid} = start_link({ok, {{one_for_one, 2, 3600}, []}}),
diff --git a/lib/stdlib/test/supervisor_SUITE_data/Makefile.src b/lib/stdlib/test/supervisor_SUITE_data/Makefile.src
new file mode 100644
index 0000000000..dbc5729f47
--- /dev/null
+++ b/lib/stdlib/test/supervisor_SUITE_data/Makefile.src
@@ -0,0 +1,15 @@
+EFLAGS=+debug_info
+
+APP_FAULTY= \
+ app_faulty/ebin/app_faulty_sup.@EMULATOR@ \
+ app_faulty/ebin/app_faulty_server.@EMULATOR@ \
+ app_faulty/ebin/app_faulty.@EMULATOR@ \
+
+all: $(APP_FAULTY)
+
+app_faulty/ebin/app_faulty_server.@EMULATOR@: app_faulty/src/app_faulty_server.erl
+ erlc $(EFLAGS) -oapp_faulty/ebin app_faulty/src/app_faulty_server.erl
+app_faulty/ebin/app_faulty_sup.@EMULATOR@: app_faulty/src/app_faulty_sup.erl
+ erlc $(EFLAGS) -oapp_faulty/ebin app_faulty/src/app_faulty_sup.erl
+app_faulty/ebin/app_faulty.@EMULATOR@: app_faulty/src/app_faulty.erl
+ erlc $(EFLAGS) -oapp_faulty/ebin app_faulty/src/app_faulty.erl
diff --git a/lib/stdlib/test/supervisor_SUITE_data/app_faulty/ebin/app_faulty.app b/lib/stdlib/test/supervisor_SUITE_data/app_faulty/ebin/app_faulty.app
new file mode 100644
index 0000000000..d4ab07e485
--- /dev/null
+++ b/lib/stdlib/test/supervisor_SUITE_data/app_faulty/ebin/app_faulty.app
@@ -0,0 +1,10 @@
+{application, app_faulty,
+ [{description, "very simple example faulty application"},
+ {id, "app_faulty"},
+ {vsn, "1.0"},
+ {modules, [app_faulty, app_faulty_sup, app_faulty_server]},
+ {registered, [app_faulty]},
+ {applications, [kernel, stdlib]},
+ {env, [{var,val1}]},
+ {mod, {app_faulty, []}}
+ ]}.
diff --git a/lib/stdlib/test/supervisor_SUITE_data/app_faulty/src/app_faulty.erl b/lib/stdlib/test/supervisor_SUITE_data/app_faulty/src/app_faulty.erl
new file mode 100644
index 0000000000..c65b411cd6
--- /dev/null
+++ b/lib/stdlib/test/supervisor_SUITE_data/app_faulty/src/app_faulty.erl
@@ -0,0 +1,17 @@
+-module(app_faulty).
+
+-behaviour(application).
+
+%% Application callbacks
+-export([start/2, stop/1]).
+
+start(_Type, _StartArgs) ->
+ case app_faulty_sup:start_link() of
+ {ok, Pid} ->
+ {ok, Pid};
+ Error ->
+ Error
+ end.
+
+stop(_State) ->
+ ok.
diff --git a/lib/stdlib/test/supervisor_SUITE_data/app_faulty/src/app_faulty_server.erl b/lib/stdlib/test/supervisor_SUITE_data/app_faulty/src/app_faulty_server.erl
new file mode 100644
index 0000000000..6628f92210
--- /dev/null
+++ b/lib/stdlib/test/supervisor_SUITE_data/app_faulty/src/app_faulty_server.erl
@@ -0,0 +1,32 @@
+-module(app_faulty_server).
+
+-behaviour(gen_server).
+
+%% API
+-export([start_link/0]).
+
+%% gen_server callbacks
+-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
+ terminate/2, code_change/3]).
+
+start_link() ->
+ gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
+
+init([]) ->
+ an_undefined_module_with:an_undefined_function(argument1, argument2),
+ {ok, []}.
+
+handle_call(_Request, _From, State) ->
+ {reply, ok, State}.
+
+handle_cast(_Msg, State) ->
+ {noreply, State}.
+
+handle_info(_Info, State) ->
+ {noreply, State}.
+
+terminate(_Reason, _State) ->
+ ok.
+
+code_change(_OldVsn, State, _Extra) ->
+ {ok, State}.
diff --git a/lib/stdlib/test/supervisor_SUITE_data/app_faulty/src/app_faulty_sup.erl b/lib/stdlib/test/supervisor_SUITE_data/app_faulty/src/app_faulty_sup.erl
new file mode 100644
index 0000000000..8115a88809
--- /dev/null
+++ b/lib/stdlib/test/supervisor_SUITE_data/app_faulty/src/app_faulty_sup.erl
@@ -0,0 +1,17 @@
+-module(app_faulty_sup).
+
+-behaviour(supervisor).
+
+%% API
+-export([start_link/0]).
+
+%% Supervisor callbacks
+-export([init/1]).
+
+start_link() ->
+ supervisor:start_link(?MODULE, []).
+
+init([]) ->
+ AChild = {app_faulty,{app_faulty_server,start_link,[]},
+ permanent,2000,worker,[app_faulty_server]},
+ {ok,{{one_for_all,0,1}, [AChild]}}.