%% The contents of this file are subject to the Mozilla Public License %% Version 1.1 (the "License"); you may not use this file except in %% compliance with the License. You may obtain a copy of the License %% at http://www.mozilla.org/MPL/ %% %% Software distributed under the License is distributed on an "AS IS" %% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See %% the License for the specific language governing rights and %% limitations under the License. %% %% The Original Code is RabbitMQ. %% %% The Initial Developer of the Original Code is VMware, Inc. %% Copyright (c) 2007-2012 VMware, Inc. All rights reserved. %% -module(rabbit). -behaviour(application). -export([start/0, boot/0, stop/0, stop_and_halt/0, await_startup/0, status/0, is_running/0, is_running/1, environment/0, rotate_logs/1, force_event_refresh/0, start_fhc/0]). -export([start/2, stop/1]). -export([log_location/1]). %% for testing %%--------------------------------------------------------------------------- %% Boot steps. -export([maybe_insert_default_data/0, boot_delegate/0, recover/0]). -rabbit_boot_step({pre_boot, [{description, "rabbit boot start"}]}). -rabbit_boot_step({codec_correctness_check, [{description, "codec correctness check"}, {mfa, {rabbit_binary_generator, check_empty_frame_size, []}}, {requires, pre_boot}, {enables, external_infrastructure}]}). -rabbit_boot_step({database, [{mfa, {rabbit_mnesia, init, []}}, {requires, file_handle_cache}, {enables, external_infrastructure}]}). -rabbit_boot_step({database_sync, [{description, "database sync"}, {mfa, {rabbit_sup, start_child, [mnesia_sync]}}, {requires, database}, {enables, external_infrastructure}]}). -rabbit_boot_step({file_handle_cache, [{description, "file handle cache server"}, {mfa, {rabbit, start_fhc, []}}, {requires, pre_boot}, {enables, worker_pool}]}). -rabbit_boot_step({worker_pool, [{description, "worker pool"}, {mfa, {rabbit_sup, start_supervisor_child, [worker_pool_sup]}}, {requires, pre_boot}, {enables, external_infrastructure}]}). -rabbit_boot_step({external_infrastructure, [{description, "external infrastructure ready"}]}). -rabbit_boot_step({rabbit_registry, [{description, "plugin registry"}, {mfa, {rabbit_sup, start_child, [rabbit_registry]}}, {requires, external_infrastructure}, {enables, kernel_ready}]}). -rabbit_boot_step({rabbit_log, [{description, "logging server"}, {mfa, {rabbit_sup, start_restartable_child, [rabbit_log]}}, {requires, external_infrastructure}, {enables, kernel_ready}]}). -rabbit_boot_step({rabbit_event, [{description, "statistics event manager"}, {mfa, {rabbit_sup, start_restartable_child, [rabbit_event]}}, {requires, external_infrastructure}, {enables, kernel_ready}]}). -rabbit_boot_step({kernel_ready, [{description, "kernel ready"}, {requires, external_infrastructure}]}). -rabbit_boot_step({rabbit_alarm, [{description, "alarm handler"}, {mfa, {rabbit_alarm, start, []}}, {requires, kernel_ready}, {enables, core_initialized}]}). -rabbit_boot_step({rabbit_memory_monitor, [{description, "memory monitor"}, {mfa, {rabbit_sup, start_restartable_child, [rabbit_memory_monitor]}}, {requires, rabbit_alarm}, {enables, core_initialized}]}). -rabbit_boot_step({guid_generator, [{description, "guid generator"}, {mfa, {rabbit_sup, start_restartable_child, [rabbit_guid]}}, {requires, kernel_ready}, {enables, core_initialized}]}). -rabbit_boot_step({delegate_sup, [{description, "cluster delegate"}, {mfa, {rabbit, boot_delegate, []}}, {requires, kernel_ready}, {enables, core_initialized}]}). -rabbit_boot_step({rabbit_node_monitor, [{description, "node monitor"}, {mfa, {rabbit_sup, start_restartable_child, [rabbit_node_monitor]}}, {requires, kernel_ready}, {enables, core_initialized}]}). -rabbit_boot_step({core_initialized, [{description, "core initialized"}, {requires, kernel_ready}]}). -rabbit_boot_step({empty_db_check, [{description, "empty DB check"}, {mfa, {?MODULE, maybe_insert_default_data, []}}, {requires, core_initialized}, {enables, routing_ready}]}). -rabbit_boot_step({recovery, [{description, "exchange, queue and binding recovery"}, {mfa, {rabbit, recover, []}}, {requires, core_initialized}, {enables, routing_ready}]}). -rabbit_boot_step({mirror_queue_slave_sup, [{description, "mirror queue slave sup"}, {mfa, {rabbit_sup, start_supervisor_child, [rabbit_mirror_queue_slave_sup]}}, {requires, recovery}, {enables, routing_ready}]}). -rabbit_boot_step({mirrored_queues, [{description, "adding mirrors to queues"}, {mfa, {rabbit_mirror_queue_misc, on_node_up, []}}, {requires, mirror_queue_slave_sup}, {enables, routing_ready}]}). -rabbit_boot_step({routing_ready, [{description, "message delivery logic ready"}, {requires, core_initialized}]}). -rabbit_boot_step({log_relay, [{description, "error log relay"}, {mfa, {rabbit_error_logger, boot, []}}, {requires, routing_ready}, {enables, networking}]}). -rabbit_boot_step({direct_client, [{description, "direct client"}, {mfa, {rabbit_direct, boot, []}}, {requires, log_relay}]}). -rabbit_boot_step({networking, [{mfa, {rabbit_networking, boot, []}}, {requires, log_relay}]}). -rabbit_boot_step({notify_cluster, [{description, "notify cluster nodes"}, {mfa, {rabbit_node_monitor, notify_node_up, []}}, {requires, networking}]}). -rabbit_boot_step({background_gc, [{description, "background garbage collection"}, {mfa, {rabbit_sup, start_restartable_child, [background_gc]}}, {enables, networking}]}). %%--------------------------------------------------------------------------- -include("rabbit_framing.hrl"). -include("rabbit.hrl"). -define(APPS, [os_mon, mnesia, rabbit]). %% see bug 24513 for how this list was created -define(HIPE_WORTHY, [rabbit_reader, rabbit_channel, gen_server2, rabbit_exchange, rabbit_command_assembler, rabbit_framing_amqp_0_9_1, rabbit_basic, rabbit_event, lists, queue, priority_queue, rabbit_router, rabbit_trace, rabbit_misc, rabbit_binary_parser, rabbit_exchange_type_direct, rabbit_guid, rabbit_net, rabbit_amqqueue_process, rabbit_variable_queue, rabbit_binary_generator, rabbit_writer, delegate, gb_sets, lqueue, sets, orddict, rabbit_amqqueue, rabbit_limiter, gb_trees, rabbit_queue_index, gen, dict, ordsets, file_handle_cache, rabbit_msg_store, array, rabbit_msg_store_ets_index, rabbit_msg_file, rabbit_exchange_type_fanout, rabbit_exchange_type_topic, mnesia, mnesia_lib, rpc, mnesia_tm, qlc, sofs, proplists, credit_flow, pmon, ssl_connection, ssl_record, gen_fsm, ssl]). %% HiPE compilation uses multiple cores anyway, but some bits are %% IO-bound so we can go faster if we parallelise a bit more. In %% practice 2 processes seems just as fast as any other number > 1, %% and keeps the progress bar realistic-ish. -define(HIPE_PROCESSES, 2). %%---------------------------------------------------------------------------- -ifdef(use_specs). -type(file_suffix() :: binary()). %% this really should be an abstract type -type(log_location() :: 'tty' | 'undefined' | file:filename()). -type(param() :: atom()). -spec(start/0 :: () -> 'ok'). -spec(boot/0 :: () -> 'ok'). -spec(stop/0 :: () -> 'ok'). -spec(stop_and_halt/0 :: () -> no_return()). -spec(await_startup/0 :: () -> 'ok'). -spec(status/0 :: () -> [{pid, integer()} | {running_applications, [{atom(), string(), string()}]} | {os, {atom(), atom()}} | {erlang_version, string()} | {memory, any()}]). -spec(is_running/0 :: () -> boolean()). -spec(is_running/1 :: (node()) -> boolean()). -spec(environment/0 :: () -> [{param() | term()}]). -spec(rotate_logs/1 :: (file_suffix()) -> rabbit_types:ok_or_error(any())). -spec(force_event_refresh/0 :: () -> 'ok'). -spec(log_location/1 :: ('sasl' | 'kernel') -> log_location()). -spec(start/2 :: ('normal',[]) -> {'error', {'erlang_version_too_old', {'found',[any()]}, {'required',[any(),...]}}} | {'ok',pid()}). -spec(stop/1 :: (_) -> 'ok'). -spec(maybe_insert_default_data/0 :: () -> 'ok'). -spec(boot_delegate/0 :: () -> 'ok'). -spec(recover/0 :: () -> 'ok'). -endif. %%---------------------------------------------------------------------------- maybe_hipe_compile() -> {ok, Want} = application:get_env(rabbit, hipe_compile), Can = code:which(hipe) =/= non_existing, case {Want, Can} of {true, true} -> hipe_compile(); {true, false} -> io:format("Not HiPE compiling: HiPE not found in " "this Erlang installation.~n"); {false, _} -> ok end. hipe_compile() -> Count = length(?HIPE_WORTHY), io:format("~nHiPE compiling: |~s|~n |", [string:copies("-", Count)]), T1 = erlang:now(), PidMRefs = [spawn_monitor(fun () -> [begin {ok, M} = hipe:c(M, [o3]), io:format("#") end || M <- Ms] end) || Ms <- split(?HIPE_WORTHY, ?HIPE_PROCESSES)], [receive {'DOWN', MRef, process, _, normal} -> ok; {'DOWN', MRef, process, _, Reason} -> exit(Reason) end || {_Pid, MRef} <- PidMRefs], T2 = erlang:now(), io:format("|~n~nCompiled ~B modules in ~Bs~n", [Count, timer:now_diff(T2, T1) div 1000000]). split(L, N) -> split0(L, [[] || _ <- lists:seq(1, N)]). split0([], Ls) -> Ls; split0([I | Is], [L | Ls]) -> split0(Is, Ls ++ [[I | L]]). ensure_application_loaded() -> %% We end up looking at the rabbit app's env for HiPE and log %% handling, so it needs to be loaded. But during the tests, it %% may end up getting loaded twice, so guard against that. case application:load(rabbit) of ok -> ok; {error, {already_loaded, rabbit}} -> ok end. start() -> start_it(fun() -> %% We do not want to HiPE compile or upgrade %% mnesia after just restarting the app ok = ensure_application_loaded(), ok = ensure_working_log_handlers(), rabbit_node_monitor:prepare_cluster_status_files(), rabbit_mnesia:check_cluster_consistency(), ok = app_utils:start_applications( app_startup_order(), fun handle_app_error/2), ok = print_plugin_info(rabbit_plugins:active()) end). boot() -> start_it(fun() -> ok = ensure_application_loaded(), maybe_hipe_compile(), ok = ensure_working_log_handlers(), rabbit_node_monitor:prepare_cluster_status_files(), ok = rabbit_upgrade:maybe_upgrade_mnesia(), %% It's important that the consistency check happens after %% the upgrade, since if we are a secondary node the %% primary node will have forgotten us rabbit_mnesia:check_cluster_consistency(), Plugins = rabbit_plugins:setup(), ToBeLoaded = Plugins ++ ?APPS, ok = app_utils:load_applications(ToBeLoaded), StartupApps = app_utils:app_dependency_order(ToBeLoaded, false), ok = app_utils:start_applications( StartupApps, fun handle_app_error/2), ok = print_plugin_info(Plugins) end). handle_app_error(App, {bad_return, {_MFA, {'EXIT', {Reason, _}}}}) -> throw({could_not_start, App, Reason}); handle_app_error(App, Reason) -> throw({could_not_start, App, Reason}). start_it(StartFun) -> try StartFun() catch throw:{could_not_start, _App, _Reason}=Err -> boot_error(Err, not_available); _:Reason -> boot_error(Reason, erlang:get_stacktrace()) after %% give the error loggers some time to catch up timer:sleep(100) end. stop() -> rabbit_log:info("Stopping RabbitMQ~n"), ok = app_utils:stop_applications(app_shutdown_order()). stop_and_halt() -> try stop() after rabbit_misc:local_info_msg("Halting Erlang VM~n", []), init:stop() end, ok. await_startup() -> app_utils:wait_for_applications(app_startup_order()). status() -> S1 = [{pid, list_to_integer(os:getpid())}, {running_applications, application:which_applications(infinity)}, {os, os:type()}, {erlang_version, erlang:system_info(system_version)}, {memory, rabbit_vm:memory()}], S2 = rabbit_misc:filter_exit_map( fun ({Key, {M, F, A}}) -> {Key, erlang:apply(M, F, A)} end, [{vm_memory_high_watermark, {vm_memory_monitor, get_vm_memory_high_watermark, []}}, {vm_memory_limit, {vm_memory_monitor, get_memory_limit, []}}, {disk_free_limit, {rabbit_disk_monitor, get_disk_free_limit, []}}, {disk_free, {rabbit_disk_monitor, get_disk_free, []}}]), S3 = rabbit_misc:with_exit_handler( fun () -> [] end, fun () -> [{file_descriptors, file_handle_cache:info()}] end), S4 = [{processes, [{limit, erlang:system_info(process_limit)}, {used, erlang:system_info(process_count)}]}, {run_queue, erlang:statistics(run_queue)}, {uptime, begin {T,_} = erlang:statistics(wall_clock), T div 1000 end}], S1 ++ S2 ++ S3 ++ S4. is_running() -> is_running(node()). is_running(Node) -> rabbit_nodes:is_running(Node, rabbit). environment() -> lists:keysort(1, [P || P = {K, _} <- application:get_all_env(rabbit), K =/= default_pass]). rotate_logs(BinarySuffix) -> Suffix = binary_to_list(BinarySuffix), rabbit_misc:local_info_msg("Rotating logs with suffix '~s'~n", [Suffix]), log_rotation_result(rotate_logs(log_location(kernel), Suffix, rabbit_error_logger_file_h), rotate_logs(log_location(sasl), Suffix, rabbit_sasl_report_file_h)). %%-------------------------------------------------------------------- start(normal, []) -> case erts_version_check() of ok -> {ok, Vsn} = application:get_key(rabbit, vsn), error_logger:info_msg("Starting RabbitMQ ~s on Erlang ~s~n", [Vsn, erlang:system_info(otp_release)]), {ok, SupPid} = rabbit_sup:start_link(), true = register(rabbit, self()), print_banner(), [ok = run_boot_step(Step) || Step <- boot_steps()], io:format("~nbroker running~n"), {ok, SupPid}; Error -> Error end. stop(_State) -> terminated_ok = error_logger:delete_report_handler(rabbit_error_logger), ok = rabbit_alarm:stop(), ok = case rabbit_mnesia:is_clustered() of true -> rabbit_amqqueue:on_node_down(node()); false -> rabbit_table:clear_ram_only_tables() end, ok. %%--------------------------------------------------------------------------- %% application life cycle app_startup_order() -> ok = app_utils:load_applications(?APPS), app_utils:app_dependency_order(?APPS, false). app_shutdown_order() -> Apps = ?APPS ++ rabbit_plugins:active(), app_utils:app_dependency_order(Apps, true). %%--------------------------------------------------------------------------- %% boot step logic run_boot_step({StepName, Attributes}) -> Description = case lists:keysearch(description, 1, Attributes) of {value, {_, D}} -> D; false -> StepName end, case [MFA || {mfa, MFA} <- Attributes] of [] -> io:format("-- ~s~n", [Description]); MFAs -> io:format("starting ~-60s ...", [Description]), [try apply(M,F,A) catch _:Reason -> boot_error(Reason, erlang:get_stacktrace()) end || {M,F,A} <- MFAs], io:format("done~n"), ok end. boot_steps() -> sort_boot_steps(rabbit_misc:all_module_attributes(rabbit_boot_step)). vertices(_Module, Steps) -> [{StepName, {StepName, Atts}} || {StepName, Atts} <- Steps]. edges(_Module, Steps) -> [case Key of requires -> {StepName, OtherStep}; enables -> {OtherStep, StepName} end || {StepName, Atts} <- Steps, {Key, OtherStep} <- Atts, Key =:= requires orelse Key =:= enables]. sort_boot_steps(UnsortedSteps) -> case rabbit_misc:build_acyclic_graph(fun vertices/2, fun edges/2, UnsortedSteps) of {ok, G} -> %% Use topological sort to find a consistent ordering (if %% there is one, otherwise fail). SortedSteps = lists:reverse( [begin {StepName, Step} = digraph:vertex(G, StepName), Step end || StepName <- digraph_utils:topsort(G)]), digraph:delete(G), %% Check that all mentioned {M,F,A} triples are exported. case [{StepName, {M,F,A}} || {StepName, Attributes} <- SortedSteps, {mfa, {M,F,A}} <- Attributes, not erlang:function_exported(M, F, length(A))] of [] -> SortedSteps; MissingFunctions -> basic_boot_error( {missing_functions, MissingFunctions}, "Boot step functions not exported: ~p~n", [MissingFunctions]) end; {error, {vertex, duplicate, StepName}} -> basic_boot_error({duplicate_boot_step, StepName}, "Duplicate boot step name: ~w~n", [StepName]); {error, {edge, Reason, From, To}} -> basic_boot_error( {invalid_boot_step_dependency, From, To}, "Could not add boot step dependency of ~w on ~w:~n~s", [To, From, case Reason of {bad_vertex, V} -> io_lib:format("Boot step not registered: ~w~n", [V]); {bad_edge, [First | Rest]} -> [io_lib:format("Cyclic dependency: ~w", [First]), [io_lib:format(" depends on ~w", [Next]) || Next <- Rest], io_lib:format(" depends on ~w~n", [First])] end]) end. boot_error(Term={error, {timeout_waiting_for_tables, _}}, _Stacktrace) -> AllNodes = rabbit_mnesia:cluster_nodes(all), {Err, Nodes} = case AllNodes -- [node()] of [] -> {"Timeout contacting cluster nodes. Since RabbitMQ was" " shut down forcefully~nit cannot determine which nodes" " are timing out.~n", []}; Ns -> {rabbit_misc:format( "Timeout contacting cluster nodes: ~p.~n", [Ns]), Ns} end, basic_boot_error(Term, Err ++ rabbit_nodes:diagnostics(Nodes) ++ "~n~n", []); boot_error(Reason, Stacktrace) -> Fmt = "Error description:~n ~p~n~n" ++ "Log files (may contain more information):~n ~s~n ~s~n~n", Args = [Reason, log_location(kernel), log_location(sasl)], boot_error(Reason, Fmt, Args, Stacktrace). boot_error(Reason, Fmt, Args, Stacktrace) -> case Stacktrace of not_available -> basic_boot_error(Reason, Fmt, Args); _ -> basic_boot_error(Reason, Fmt ++ "Stack trace:~n ~p~n~n", Args ++ [Stacktrace]) end. basic_boot_error(Reason, Format, Args) -> io:format("~n~nBOOT FAILED~n===========~n~n" ++ Format, Args), rabbit_misc:local_info_msg(Format, Args), timer:sleep(1000), exit({?MODULE, failure_during_boot, Reason}). %%--------------------------------------------------------------------------- %% boot step functions boot_delegate() -> {ok, Count} = application:get_env(rabbit, delegate_count), rabbit_sup:start_supervisor_child(delegate_sup, [Count]). recover() -> Qs = rabbit_amqqueue:recover(), ok = rabbit_binding:recover(rabbit_exchange:recover(), [QName || #amqqueue{name = QName} <- Qs]), rabbit_amqqueue:start(Qs). maybe_insert_default_data() -> case rabbit_table:is_empty() of true -> insert_default_data(); false -> ok end. insert_default_data() -> {ok, DefaultUser} = application:get_env(default_user), {ok, DefaultPass} = application:get_env(default_pass), {ok, DefaultTags} = application:get_env(default_user_tags), {ok, DefaultVHost} = application:get_env(default_vhost), {ok, [DefaultConfigurePerm, DefaultWritePerm, DefaultReadPerm]} = application:get_env(default_permissions), ok = rabbit_vhost:add(DefaultVHost), ok = rabbit_auth_backend_internal:add_user(DefaultUser, DefaultPass), ok = rabbit_auth_backend_internal:set_tags(DefaultUser, DefaultTags), ok = rabbit_auth_backend_internal:set_permissions(DefaultUser, DefaultVHost, DefaultConfigurePerm, DefaultWritePerm, DefaultReadPerm), ok. %%--------------------------------------------------------------------------- %% logging ensure_working_log_handlers() -> Handlers = gen_event:which_handlers(error_logger), ok = ensure_working_log_handler(error_logger_tty_h, rabbit_error_logger_file_h, error_logger_tty_h, log_location(kernel), Handlers), ok = ensure_working_log_handler(sasl_report_tty_h, rabbit_sasl_report_file_h, sasl_report_tty_h, log_location(sasl), Handlers), ok. ensure_working_log_handler(OldHandler, NewHandler, TTYHandler, LogLocation, Handlers) -> case LogLocation of undefined -> ok; tty -> case lists:member(TTYHandler, Handlers) of true -> ok; false -> throw({error, {cannot_log_to_tty, TTYHandler, not_installed}}) end; _ -> case lists:member(NewHandler, Handlers) of true -> ok; false -> case rotate_logs(LogLocation, "", OldHandler, NewHandler) of ok -> ok; {error, Reason} -> throw({error, {cannot_log_to_file, LogLocation, Reason}}) end end end. log_location(Type) -> case application:get_env(rabbit, case Type of kernel -> error_logger; sasl -> sasl_error_logger end) of {ok, {file, File}} -> File; {ok, false} -> undefined; {ok, tty} -> tty; {ok, silent} -> undefined; {ok, Bad} -> throw({error, {cannot_log_to_file, Bad}}); _ -> undefined end. rotate_logs(File, Suffix, Handler) -> rotate_logs(File, Suffix, Handler, Handler). rotate_logs(undefined, _Suffix, _OldHandler, _NewHandler) -> ok; rotate_logs(tty, _Suffix, _OldHandler, _NewHandler) -> ok; rotate_logs(File, Suffix, OldHandler, NewHandler) -> gen_event:swap_handler(error_logger, {OldHandler, swap}, {NewHandler, {File, Suffix}}). log_rotation_result({error, MainLogError}, {error, SaslLogError}) -> {error, {{cannot_rotate_main_logs, MainLogError}, {cannot_rotate_sasl_logs, SaslLogError}}}; log_rotation_result({error, MainLogError}, ok) -> {error, {cannot_rotate_main_logs, MainLogError}}; log_rotation_result(ok, {error, SaslLogError}) -> {error, {cannot_rotate_sasl_logs, SaslLogError}}; log_rotation_result(ok, ok) -> ok. force_event_refresh() -> rabbit_direct:force_event_refresh(), rabbit_networking:force_connection_event_refresh(), rabbit_channel:force_event_refresh(), rabbit_amqqueue:force_event_refresh(). %%--------------------------------------------------------------------------- %% misc print_plugin_info([]) -> ok; print_plugin_info(Plugins) -> %% This gets invoked by rabbitmqctl start_app, outside the context %% of the rabbit application rabbit_misc:with_local_io( fun() -> io:format("~n-- plugins running~n"), [print_plugin_info( AppName, element(2, application:get_key(AppName, vsn))) || AppName <- Plugins], ok end). print_plugin_info(Plugin, Vsn) -> Len = 76 - length(Vsn), io:format("~-" ++ integer_to_list(Len) ++ "s ~s~n", [Plugin, Vsn]). erts_version_check() -> FoundVer = erlang:system_info(version), case rabbit_misc:version_compare(?ERTS_MINIMUM, FoundVer, lte) of true -> ok; false -> {error, {erlang_version_too_old, {found, FoundVer}, {required, ?ERTS_MINIMUM}}} end. print_banner() -> {ok, Product} = application:get_key(id), {ok, Version} = application:get_key(vsn), ProductLen = string:len(Product), io:format("~n" "+---+ +---+~n" "| | | |~n" "| | | |~n" "| | | |~n" "| +---+ +-------+~n" "| |~n" "| ~s +---+ |~n" "| | | |~n" "| ~s +---+ |~n" "| |~n" "+-------------------+~n" "~s~n~s~n~s~n~n", [Product, string:right([$v|Version], ProductLen), ?PROTOCOL_VERSION, ?COPYRIGHT_MESSAGE, ?INFORMATION_MESSAGE]), Settings = [{"node", node()}, {"app descriptor", app_location()}, {"home dir", home_dir()}, {"config file(s)", config_files()}, {"cookie hash", rabbit_nodes:cookie_hash()}, {"log", log_location(kernel)}, {"sasl log", log_location(sasl)}, {"database dir", rabbit_mnesia:dir()}, {"erlang version", erlang:system_info(version)}], DescrLen = 1 + lists:max([length(K) || {K, _V} <- Settings]), Format = fun (K, V) -> io:format("~-" ++ integer_to_list(DescrLen) ++ "s: ~s~n", [K, V]) end, lists:foreach(fun ({"config file(s)" = K, []}) -> Format(K, "(none)"); ({"config file(s)" = K, [V0 | Vs]}) -> Format(K, V0), [Format("", V) || V <- Vs]; ({K, V}) -> Format(K, V) end, Settings), io:nl(). app_location() -> {ok, Application} = application:get_application(), filename:absname(code:where_is_file(atom_to_list(Application) ++ ".app")). home_dir() -> case init:get_argument(home) of {ok, [[Home]]} -> Home; Other -> Other end. config_files() -> case init:get_argument(config) of {ok, Files} -> [filename:absname( filename:rootname(File, ".config") ++ ".config") || [File] <- Files]; error -> [] end. %% We don't want this in fhc since it references rabbit stuff. And we can't put %% this in the bootstep directly. start_fhc() -> rabbit_sup:start_restartable_child( file_handle_cache, [fun rabbit_alarm:set_alarm/1, fun rabbit_alarm:clear_alarm/1]).