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207 rader
7.4 KiB
207 rader
7.4 KiB
-module(eRum_app).
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-behaviour(application).
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-include("rumCom.hrl").
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-include("rumDef.hrl").
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-include("eRum.hrl").
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-export([
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start/2
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, stop/1
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, doStart/0
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, startSink/1
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, startSink/2
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, startHandler/3
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]).
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start(_StartType, _StartArgs) ->
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{ok, Pid} = eRum_sup:start_link(),
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SavedHandlers = doStart(),
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doStartExtraSink(),
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doStartTraces(),
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?eRumInit(),
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{ok, Pid, SavedHandlers}.
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%% 启动默认的接收器(sink)
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doStart() ->
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%% 尝试起送异步管理者
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tryStartAsyncMgr(rumUtil:get_env(asyncThreshold, undefined), rumUtil:get_env(asyncThresholdWindow, undefined), ?RumDefSink),
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%%尝试安装killer
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tryInstallKiller(rumUtil:get_env(killerHwm, undefined), rumUtil:get_env(killerReTime, undefined), ?RumDefSink),
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%%尝试启动各个handler
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tryStartHandlers(rumUtil:get_env(handlers, ?RumDefHandler), ?RumDefSink),
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%% 尝试替换error logger
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SavedHandlers = tryStartErrLoggerHandler(rumUtil:get_env(errLoggerRedirect, true), rumUtil:get_env(errLoggerHwm, 0), rumUtil:get_env(errLoggerWhitelist, [])),
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eRum:updateLogevelCfg(?RumDefSink),
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SavedHandlers.
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startSink(?RumDefSink) -> doStart();
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startSink(Sink) ->
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AllSinksDef = rumUtil:get_env(extraSinks, []),
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SinkValue = lists:keyfind(Sink, 1, AllSinksDef),
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SinkOpts = ?IIF(SinkValue == false, [], element(2, SinkValue)),
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startSink(Sink, SinkOpts).
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startSink(Sink, Opts) ->
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rumConfig:initSink(Sink),
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ChildId = rumUtil:makeInnerSinkName(Sink),
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SinkSpec = #{
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id => ChildId,
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start => {gen_event, start_link, [{local, Sink}]},
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restart => permanent,
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shutdown => 5000,
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type => worker,
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modules => [dynamic]},
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_ = supervisor:start_child(eRum_sup, SinkSpec),
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tryStartAsyncMgr(proplists:get_value(asyncThreshold, Opts, undefined), proplists:get_value(asyncThresholdWindow, Opts, undefined), Sink),
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tryInstallKiller(proplists:get_value(killerHwm, Opts, undefined), proplists:get_value(killerReTime, Opts, undefined), Sink),
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tryStartHandlers(proplists:get_value(handlers, Opts, []), Sink),
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eRum:updateLogevelCfg(Sink).
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doStartExtraSink() ->
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doStartExtraSinks(rumUtil:get_env(extraSinks, [])).
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doStartExtraSinks(Sinks) ->
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[startSink(Sink, Opts) || {Sink, Opts} <- Sinks],
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ok.
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doStartTraces() ->
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_ = rumUtil:trace_filter(none),
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ok = addTraces().
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addTraces() ->
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Traces = rumUtil:get_env(traces, []),
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[startTrace(One) || One <- Traces],
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ok.
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startTrace({Handler, Filter}) ->
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{ok, _} = eRum:trace(Handler, Filter);
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startTrace({Handler, Filter, Level}) when is_atom(Level) ->
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{ok, _} = eRum:trace(Handler, Filter, Level).
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stop(Handlers) ->
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[error_logger:add_report_handler(Handler) || Handler <- Handlers],
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rumConfig:cleanup().
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tryStartAsyncMgr(undefined, _Window, _Sink) ->
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ignore;
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tryStartAsyncMgr(Threshold, Window, Sink) ->
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case Window of
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undefined ->
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supervisor:start_child(rumHWatcherSup, [Sink, rumBkdThrottle, [Threshold, erlang:trunc(Threshold * 0.2)]]);
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_ ->
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supervisor:start_child(rumHWatcherSup, [Sink, rumBkdThrottle, [Threshold, Window]])
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end,
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ok.
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tryInstallKiller(undefined, _ReTime, _Sink) -> ok;
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tryInstallKiller(HWM, ReTime, Sink) ->
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case ReTime of
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undefined ->
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_ = supervisor:start_child(rumHWatcherSup, [Sink, rumMgrKiller, [HWM, 5000]]);
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_ ->
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_ = supervisor:start_child(rumHWatcherSup, [Sink, rumMgrKiller, [HWM, ReTime]])
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end,
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ok.
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tryStartHandlers(undefined, _Sink) -> ok;
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tryStartHandlers(Handlers, Sink) ->
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%% 启动失败的处理程序将在handler_watcher中处理
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NewHandler = doStartHandlers(Handlers, Sink, [], []),
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rumConfig:global_set(handlers, rumConfig:global_get(handlers, []) ++ NewHandler),
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ok.
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doStartHandlers([], _Sink, _NameAcc, HandlerAcc) ->
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HandlerAcc;
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doStartHandlers([OneHandler | Handlers], Sink, NameAcc, HandlerAcc) ->
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{Module, Options} = parseHandlers(OneHandler),
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NewNameAcc =
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case Module of
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{rumBkFile, F} ->
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case lists:member(F, NameAcc) of
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true ->
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error_logger:error_msg("Cannot have same file (~p) in multiple file backends~n", [F]),
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throw({error, bad_config});
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_ ->
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[F | NameAcc]
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end;
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_ ->
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NameAcc
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end,
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HandlerRet = startHandler(Sink, Module, Options),
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doStartHandlers(Handlers, Sink, NewNameAcc, [HandlerRet | HandlerAcc]).
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startHandler(Sink, Module, Config) ->
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{ok, Watcher} = supervisor:start_child(rumHWatcherSup, [Sink, Module, Config]),
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{Module, Watcher, Sink}.
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-spec tryStartErrLoggerHandler(boolean(), pos_integer(), list()) -> list().
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tryStartErrLoggerHandler(false, _HWM, _Whitelist) -> [];
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tryStartErrLoggerHandler(_ErrLoggerRedirect, HWM, WhiteList) ->
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case whereis(error_logger) of
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undefined ->
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%% 在OTP 21及以上版本中，error_logger已弃用，而改用 'logger'
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%% 作为一个修补, 启动error_logger并将其安装为 logger handler
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%% 我们不能使用 error_logger:add_report_handler 因为我们想要监视这个handler
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%% 因此，我们必须手动添加这个 logger handler
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%%
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%% 从长远来看，我们应该安装一个日志处理程序, but this will bridge the gap for now.
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_ = error_logger:start(),
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_ = logger:add_handler(error_logger, error_logger, #{level => info, filter_default => log}),
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ok = tryRemoveLoggerHandler();
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_ ->
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ok
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end,
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%% capture which handlers we removed from error_logger so we can restore them when lager stops
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%% 捕获从error_logger中删除的处理程序，以便在lager停止时恢复它们
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OldHandlers =
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case supervisor:start_child(rumHWatcherSup, [error_logger, rumErrLoggerH, [HWM, rumUtil:get_env(errLoggerGroupLeaderStrategy, handle)]]) of
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{ok, _} ->
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[begin error_logger:delete_report_handler(X), X end || X <- gen_event:which_handlers(error_logger) -- [rumErrLoggerH | WhiteList]];
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{error, _} ->
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[]
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end,
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OldHandlers.
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%% 在OTP 21.1及更高版本上，我们需要删除`default' handler。但是它可能不存在，因此我们将其包装在try-catch块中
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tryRemoveLoggerHandler() ->
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try
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ok = logger:remove_handler(default)
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catch
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error:undef -> ok;
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Err:Reason ->
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error_logger:error_msg("calling logger:remove_handler(default) failed: ~p ~p", [Err, Reason])
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end.
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parseHandlers([]) ->
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[];
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parseHandlers({rumBkdFile, Config}) ->
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%% this is definitely a new-style config, no expansion needed
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maybe_make_handler_id(rumBkdFile, Config);
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parseHandlers({Mod, Config}) ->
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maybe_make_handler_id(Mod, Config).
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maybe_make_handler_id(Mod, Config) ->
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%% Allow the backend to generate a gen_event handler id, if it wants to.
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%% We don't use erlang:function_exported here because that requires the module
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%% already be loaded, which is unlikely at this phase of startup. Using code:load
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%% caused undesirable side-effects with generating code-coverage reports.
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%%允许后端生成gen_event处理程序id，如果它愿意的话。
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%%这里我们没有使用erlang:function_exported，因为这需要用到模块
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%%已经加载，这在启动阶段是不太可能的。使用代码:负载
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%%会在生成代码覆盖率报告时产生不良的副作用。
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try Mod:configToId(Config) of
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Id ->
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{Id, Config}
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catch
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error:undef ->
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{Mod, Config}
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end.
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