Merge pull request #3756 from pouriya/Add-Process-Hook-Tracing
Add process hook tracing
This commit is contained in:
badlop
GitHub
commit
e3ff868fcd
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@ -46,12 +46,23 @@
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handle_info/2,
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terminate/2]).
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-export(
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[
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get_tracing_options/3,
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trace_off/3,
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trace_on/5,human_readable_time_string/1
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]
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).
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-include("logger.hrl").
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-include("ejabberd_stacktrace.hrl").
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-record(state, {}).
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-type hook() :: {Seq :: integer(), Module :: atom(), Function :: atom() | fun()}.
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-define(TRACE_HOOK_KEY, '$trace_hook').
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-define(TIMING_KEY, '$trace_hook_timer').
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%%%----------------------------------------------------------------------
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%%% API
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%%%----------------------------------------------------------------------
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@ -104,7 +115,18 @@ run(Hook, Args) ->
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run(Hook, Host, Args) ->
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try ets:lookup(hooks, {Hook, Host}) of
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[{_, Ls}] ->
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run1(Ls, Hook, Args);
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case erlang:get(?TRACE_HOOK_KEY) of
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undefined ->
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run1(Ls, Hook, Args);
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TracingHooksOpts ->
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case do_get_tracing_options(Hook, Host, TracingHooksOpts) of
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undefined ->
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run1(Ls, Hook, Args);
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TracingOpts ->
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foreach_start_hook_tracing(TracingOpts, Hook, Host, Args),
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run2(Ls, Hook, Args, Host, TracingOpts)
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end
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end;
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[] ->
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ok
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catch _:badarg ->
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@ -124,13 +146,75 @@ run_fold(Hook, Val, Args) ->
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run_fold(Hook, Host, Val, Args) ->
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try ets:lookup(hooks, {Hook, Host}) of
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[{_, Ls}] ->
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run_fold1(Ls, Hook, Val, Args);
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case erlang:get(?TRACE_HOOK_KEY) of
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undefined ->
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run_fold1(Ls, Hook, Val, Args);
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TracingHooksOpts ->
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case do_get_tracing_options(Hook, Host, TracingHooksOpts) of
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undefined ->
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run_fold1(Ls, Hook, Val, Args);
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TracingOpts ->
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fold_start_hook_tracing(TracingOpts, Hook, Host, [Val | Args]),
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run_fold2(Ls, Hook, Val, Args, Host, TracingOpts)
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end
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end;
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[] ->
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Val
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catch _:badarg ->
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Val
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end.
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get_tracing_options(Hook, Host, Pid) when Pid == erlang:self() ->
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do_get_tracing_options(Hook, Host, erlang:get(?TRACE_HOOK_KEY));
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get_tracing_options(Hook, Host, Pid) when erlang:is_pid(Pid) ->
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case erlang:process_info(Pid, dictionary) of
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{_, DictPropList} ->
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case lists:keyfind(?TRACE_HOOK_KEY, 1, DictPropList) of
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{_, TracingHooksOpts} ->
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do_get_tracing_options(Hook, Host, TracingHooksOpts);
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_ ->
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undefined
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end;
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_ ->
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undefined
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end.
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trace_on(Hook, Host, Pid, #{}=Opts, Timeout) when Pid == erlang:self() ->
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do_trace_on(Hook, Host, Opts, Timeout);
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trace_on(Hook, Host, Proc, #{}=Opts, Timeout) ->
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try sys:replace_state(
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Proc,
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fun(State) ->
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do_trace_on(Hook, Host, Opts, Timeout),
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State
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end,
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15000
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) of
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_ -> % process state
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ok
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catch
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_:Reason ->
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{error, Reason}
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end.
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trace_off(Hook, Host, Pid) when Pid == erlang:self() ->
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do_trace_off(Hook, Host);
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trace_off(Hook, Host, Proc) ->
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try sys:replace_state(
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Proc,
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fun(State) ->
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do_trace_off(Hook, Host),
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State
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end,
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15000
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) of
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_ -> % process state
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ok
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catch
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_:Reason ->
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{error, Reason}
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end.
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%%%----------------------------------------------------------------------
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%%% Callback functions from gen_server
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%%%----------------------------------------------------------------------
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@ -247,3 +331,423 @@ safe_apply(Hook, Module, Function, Args) ->
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misc:format_exception(2, E, R, Stack)|Args]),
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'EXIT'
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end.
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%%%----------------------------------------------------------------------
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%%% Internal tracing functions
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%%%----------------------------------------------------------------------
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do_trace_on(Hook, Host, Opts, Timeout) when erlang:is_list(Host) ->
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do_trace_on(Hook, erlang:list_to_binary(Host), Opts, Timeout);
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do_trace_on(Hook, Host, Opts, undefined) ->
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case erlang:get(?TRACE_HOOK_KEY) of
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_ when Hook == all andalso Host == <<"*">> ->
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% Trace everything:
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erlang:put(?TRACE_HOOK_KEY, #{all => #{<<"*">> => Opts}});
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#{all := #{<<"*">> := _}} -> % Already tracing everything
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% Update Opts:
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erlang:put(?TRACE_HOOK_KEY, #{all => #{<<"*">> => Opts}});
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#{all := HostOpts} when Hook == all -> % Already Tracing everything for some hosts
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% Add/Update Host and Opts:
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erlang:put(?TRACE_HOOK_KEY, #{all => HostOpts#{Host => Opts}});
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#{all := _} -> % Already tracing everything and Hook is not all
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ok;
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#{} when Hook == all ->
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% Remove other hooks by just adding all:
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erlang:put(?TRACE_HOOK_KEY, #{all => #{Host => Opts}});
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#{}=TraceHooksOpts when Host == <<"*">> -> % Want to trace a hook for all hosts
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erlang:put(?TRACE_HOOK_KEY, TraceHooksOpts#{Hook => #{Host => Opts}});
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#{}=TraceHooksOpts ->
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case maps:get(Hook, TraceHooksOpts, #{}) of
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#{<<"*">> := _} -> % Already tracing this hook for all hosts
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ok;
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HostOpts ->
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erlang:put(?TRACE_HOOK_KEY, TraceHooksOpts#{Hook => HostOpts#{Host => Opts}})
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end;
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undefined ->
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erlang:put(?TRACE_HOOK_KEY, #{Hook => #{Host => Opts}})
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end,
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ok;
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do_trace_on(Hook, Host, Opts, TimeoutSeconds) -> % Trace myself `Timeout` time
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Timeout = timer:seconds(TimeoutSeconds),
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ParentPid = erlang:self(),
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try erlang:spawn(
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fun() ->
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MonitorRef = erlang:monitor(process, ParentPid),
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receive
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{_, MonitorRef, _, _, _} ->
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ok
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after Timeout ->
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trace_off(Hook, Host, ParentPid)
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end,
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erlang:exit(normal)
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end
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) of
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_ ->
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do_trace_on(Hook, Host, Opts, undefined) % ok
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catch
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_:Reason -> % system_limit
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{error, Reason}
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end.
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do_trace_off(Hook, Host) when erlang:is_list(Host) ->
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do_trace_off(Hook, erlang:list_to_binary(Host));
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do_trace_off(Hook, Host) ->
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case erlang:get(?TRACE_HOOK_KEY) of
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_ when Hook == all andalso Host == <<"*">> ->
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% Remove all tracing:
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erlang:erase(?TRACE_HOOK_KEY);
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#{all := HostOpts} when Hook == all -> % Already tracing all hooks
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% Remove Host:
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HostOpts2 = maps:remove(Host, HostOpts),
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if
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HostOpts2 == #{} ->
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% Remove all tracing:
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erlang:erase(?TRACE_HOOK_KEY);
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true ->
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erlang:put(?TRACE_HOOK_KEY, #{all => HostOpts2})
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end;
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#{}=TraceHooksOpts when Host == <<"*">> ->
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% Remove tracing of this hook for all hosts:
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TraceHooksOpts2 = maps:remove(Hook, TraceHooksOpts),
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if
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TraceHooksOpts2 == #{} ->
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% Remove all tracing:
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erlang:erase(?TRACE_HOOK_KEY);
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true ->
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erlang:put(?TRACE_HOOK_KEY, TraceHooksOpts2)
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end;
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#{}=TraceHooksOpts ->
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case maps:get(Hook, TraceHooksOpts, undefined) of
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#{}=HostOpts ->
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NewHostOpts = maps:remove(Host, HostOpts),
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if
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NewHostOpts == #{} ->
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% Remove hook:
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erlang:put(?TRACE_HOOK_KEY, maps:remove(Hook, TraceHooksOpts));
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true ->
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erlang:put(?TRACE_HOOK_KEY, TraceHooksOpts#{Hook => NewHostOpts})
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end;
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_ ->
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ok
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end;
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undefined ->
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ok
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end,
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ok.
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do_get_tracing_options(Hook, Host, MaybeMap) ->
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case MaybeMap of
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undefined ->
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undefined;
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#{all := #{<<"*">> := Opts}} -> % Tracing everything
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Opts;
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#{all := HostOpts} -> % Tracing all hooks for some hosts
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maps:get(Host, HostOpts, undefined);
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#{}=TraceHooksOpts ->
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HostOpts = maps:get(Hook, TraceHooksOpts, #{}),
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case maps:get(Host, HostOpts, undefined) of
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undefined ->
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maps:get(<<"*">>, HostOpts, undefined);
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Opts ->
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Opts
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end
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end.
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run2([], Hook, Args, Host, Opts) ->
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foreach_stop_hook_tracing(Opts, Hook, Host, Args, undefined),
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ok;
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run2([{Seq, Module, Function} | Ls], Hook, Args, Host, TracingOpts) ->
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foreach_start_callback_tracing(TracingOpts, Hook, Host, Module, Function, Args, Seq),
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Res = safe_apply(Hook, Module, Function, Args),
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foreach_stop_callback_tracing(TracingOpts, Hook, Host, Module, Function, Args, Seq, Res),
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case Res of
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'EXIT' ->
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run2(Ls, Hook, Args, Host, TracingOpts);
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stop ->
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foreach_stop_hook_tracing(TracingOpts, Hook, Host, Args, {Module, Function, Seq, Ls}),
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ok;
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_ ->
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run2(Ls, Hook, Args, Host, TracingOpts)
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end.
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run_fold2([], Hook, Val, Args, Host, Opts) ->
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fold_stop_hook_tracing(Opts, Hook, Host, [Val | Args], undefined),
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Val;
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run_fold2([{Seq, Module, Function} | Ls], Hook, Val, Args, Host, TracingOpts) ->
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fold_start_callback_tracing(TracingOpts, Hook, Host, Module, Function, [Val | Args], Seq),
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Res = safe_apply(Hook, Module, Function, [Val | Args]),
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fold_stop_callback_tracing(TracingOpts, Hook, Host, Module, Function, [Val | Args], Seq, Res),
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case Res of
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'EXIT' ->
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run_fold2(Ls, Hook, Val, Args, Host, TracingOpts);
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stop ->
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fold_stop_hook_tracing(TracingOpts, Hook, Host, [Val | Args], {Module, Function, Seq, {old, Val}, Ls}),
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Val;
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{stop, NewVal} ->
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fold_stop_hook_tracing(TracingOpts, Hook, Host, [Val | Args], {Module, Function, Seq, {new, NewVal}, Ls}),
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NewVal;
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NewVal ->
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run_fold2(Ls, Hook, NewVal, Args, Host, TracingOpts)
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end.
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foreach_start_hook_tracing(TracingOpts, Hook, Host, Args) ->
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run_event_handlers(TracingOpts, Hook, Host, start_hook, [Args], foreach).
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foreach_stop_hook_tracing(TracingOpts, Hook, Host, Args, BreakCallback) ->
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run_event_handlers(TracingOpts, Hook, Host, stop_hook, [Args, BreakCallback], foreach).
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foreach_start_callback_tracing(TracingOpts, Hook, Host, Mod, Func, Args, Seq) ->
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run_event_handlers(TracingOpts, Hook, Host, start_callback, [Mod, Func, Args, Seq], foreach).
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foreach_stop_callback_tracing(TracingOpts, Hook, Host, Mod, Func, Args, Seq, Res) ->
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run_event_handlers(TracingOpts, Hook, Host, stop_callback, [Mod, Func, Args, Seq, Res], foreach).
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fold_start_hook_tracing(TracingOpts, Hook, Host, Args) ->
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run_event_handlers(TracingOpts, Hook, Host, start_hook, [Args], fold).
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fold_stop_hook_tracing(TracingOpts, Hook, Host, Args, BreakCallback) ->
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run_event_handlers(TracingOpts, Hook, Host, stop_hook, [Args, BreakCallback], fold).
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fold_start_callback_tracing(TracingOpts, Hook, Host, Mod, Func, Args, Seq) ->
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run_event_handlers(TracingOpts, Hook, Host, start_callback, [Mod, Func, Args, Seq], fold).
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fold_stop_callback_tracing(TracingOpts, Hook, Host, Mod, Func, Args, Seq, Res) ->
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run_event_handlers(TracingOpts, Hook, Host, stop_callback, [Mod, Func, Args, Seq, Res], fold).
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run_event_handlers(TracingOpts, Hook, Host, Event, EventArgs, RunType) ->
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EventHandlerList = maps:get(event_handler_list, TracingOpts, default_tracing_event_handler_list()),
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EventHandlerOpts = maps:get(event_handler_options, TracingOpts, #{}),
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if
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erlang:is_list(EventHandlerList) ->
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lists:foreach(
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fun(EventHandler) ->
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try
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if
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erlang:is_function(EventHandler) ->
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erlang:apply(
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EventHandler,
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[Event, EventArgs, RunType, Hook, Host, EventHandlerOpts, TracingOpts]
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);
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true ->
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EventHandler:handle_hook_tracing_event(
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Event,
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EventArgs,
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RunType,
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Hook,
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Host,
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EventHandlerOpts,
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TracingOpts
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)
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end
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of
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_ ->
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ok
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catch
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?EX_RULE(E, R, St) ->
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?ERROR_MSG(
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"(~0p|~ts|~0p) Tracing event '~0p' handler exception(~0p): ~0p: ~0p",
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[Hook, Host, erlang:self(), EventHandler, E, R, St]
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),
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ok
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end
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end,
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EventHandlerList
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); % ok
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true ->
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?ERROR_MSG("(~0p|~ts|~0p) Bad event handler list: ~0p", [Hook, Host, erlang:self(), EventHandlerList]),
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ok
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end.
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default_tracing_event_handler_list() ->
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[fun tracing_timing_event_handler/7].
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tracing_timing_event_handler(start_hook, EventArgs, RunType, Hook, Host, _, TracingOpts) ->
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HookStart = erlang:system_time(nanosecond),
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% Generate new event:
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run_event_handlers(TracingOpts, Hook, Host, start_hook_timing, EventArgs ++ [HookStart], RunType);
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tracing_timing_event_handler(stop_hook, EventArgs, RunType, Hook, Host, _, TracingOpts) ->
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HookStop = erlang:system_time(nanosecond),
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TimingMap = #{} = erlang:get(?TIMING_KEY),
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{HookStart, CallbackList} = maps:get({Hook, Host}, TimingMap),
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{CallbackListTiming, CallbackListTotal} = lists:foldl(
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fun({_, _, _, CallbackStart, CallbackStop}=CallbackTimingInfo, {CallbackListTimingX, Total}) ->
|
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{CallbackListTimingX ++ [CallbackTimingInfo], Total + (CallbackStop - CallbackStart)}
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end,
|
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{[], 0},
|
||||
CallbackList
|
||||
),
|
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% Generate new event:
|
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run_event_handlers(
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TracingOpts,
|
||||
Hook,
|
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Host,
|
||||
stop_hook_timing,
|
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EventArgs ++ [HookStart, HookStop, CallbackListTiming, CallbackListTotal],
|
||||
RunType
|
||||
);
|
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tracing_timing_event_handler(start_callback, EventArgs, RunType, Hook, Host, _, TracingOpts) ->
|
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CallbackStart = erlang:system_time(nanosecond),
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% Generate new event:
|
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run_event_handlers(TracingOpts, Hook, Host, start_callback_timing, EventArgs ++ [CallbackStart], RunType);
|
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tracing_timing_event_handler(stop_callback, EventArgs, RunType, Hook, Host, _, TracingOpts) ->
|
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CallbackStop = erlang:system_time(nanosecond),
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TimingMap = #{} = erlang:get(?TIMING_KEY),
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{_, [{_, _, _, CallbackStart} | _]} = maps:get({Hook, Host}, TimingMap),
|
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run_event_handlers(
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TracingOpts,
|
||||
Hook,
|
||||
Host,
|
||||
stop_callback_timing,
|
||||
EventArgs ++ [CallbackStart, CallbackStop],
|
||||
RunType
|
||||
),
|
||||
ok;
|
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tracing_timing_event_handler(start_hook_timing, [_, HookStart], RunType, Hook, Host, EventHandlerOpts, _) ->
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tracing_output(EventHandlerOpts, "(~0p|~ts|~0p|~0p) Timing started\n", [Hook, Host, erlang:self(), RunType]),
|
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case erlang:get(?TIMING_KEY) of
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#{}=TimingMap ->
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erlang:put(?TIMING_KEY, TimingMap#{{Hook, Host} => {HookStart, []}});
|
||||
_ ->
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erlang:put(?TIMING_KEY, #{{Hook, Host} => {HookStart, []}})
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||||
end,
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ok;
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tracing_timing_event_handler(
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stop_hook_timing,
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||||
[_, _, HookStart, HookStop, CallbackListTiming, CallbackListTotal],
|
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RunType,
|
||||
Hook,
|
||||
Host,
|
||||
EventHandlerOpts,
|
||||
_
|
||||
) ->
|
||||
if
|
||||
erlang:length(CallbackListTiming) < 2 -> % We don't need sorted timing result
|
||||
ok;
|
||||
true ->
|
||||
CallbackListTimingText =
|
||||
lists:foldl(
|
||||
fun({Mod, Func, Arity, Diff}, CallbackListTimingText) ->
|
||||
CallbackListTimingText
|
||||
++ "\n\t"
|
||||
++ mfa_string({Mod, Func, Arity})
|
||||
++ " -> "
|
||||
++ human_readable_time_string(Diff)
|
||||
end,
|
||||
"",
|
||||
lists:keysort(
|
||||
4,
|
||||
[
|
||||
{Mod, Func, Arity, CallbackStop - CallbackStart} ||
|
||||
{Mod, Func, Arity, CallbackStart, CallbackStop} <- CallbackListTiming
|
||||
]
|
||||
)
|
||||
),
|
||||
tracing_output(
|
||||
EventHandlerOpts,
|
||||
"(~0p|~ts|~0p|~0p) All callbacks took ~ts to run. Sorted running time:"
|
||||
++ CallbackListTimingText
|
||||
++ "\n",
|
||||
[Hook, Host, erlang:self(), RunType, human_readable_time_string(CallbackListTotal)]
|
||||
),
|
||||
tracing_output(
|
||||
EventHandlerOpts,
|
||||
"(~0p|~ts|~0p|~0p) Time calculations for all callbacks took ~ts\n",
|
||||
[
|
||||
Hook,
|
||||
Host,
|
||||
erlang:self(),
|
||||
RunType,
|
||||
human_readable_time_string((HookStop - HookStart) - CallbackListTotal)
|
||||
]
|
||||
)
|
||||
end,
|
||||
tracing_output(EventHandlerOpts, "(~0p|~ts|~0p|~0p) Timing stopped\n", [Hook, Host, erlang:self(), RunType]),
|
||||
TimingMap = #{} = erlang:get(?TIMING_KEY),
|
||||
NewTimingMap = maps:remove({Hook, Host}, TimingMap),
|
||||
if
|
||||
NewTimingMap == #{} ->
|
||||
erlang:erase(?TIMING_KEY);
|
||||
true ->
|
||||
erlang:put(?TIMING_KEY, NewTimingMap)
|
||||
end,
|
||||
ok;
|
||||
tracing_timing_event_handler(start_callback_timing, [Mod, Func, Args, _, CallbackStart], _, Hook, Host, _, _) ->
|
||||
TimingMap = #{} = erlang:get(?TIMING_KEY),
|
||||
{HookStart, Callbacks} = maps:get({Hook, Host}, TimingMap),
|
||||
erlang:put(
|
||||
?TIMING_KEY,
|
||||
TimingMap#{
|
||||
{Hook, Host} => {HookStart, [{Mod, Func, erlang:length(Args), CallbackStart} | Callbacks]}
|
||||
}
|
||||
),
|
||||
ok;
|
||||
tracing_timing_event_handler(
|
||||
stop_callback_timing,
|
||||
[Mod, Func, _, _, _, CallbackStart, CallbackStop],
|
||||
RunType,
|
||||
Hook,
|
||||
Host,
|
||||
EventHandlerOpts,
|
||||
_
|
||||
) ->
|
||||
TimingMap = #{} = erlang:get(?TIMING_KEY),
|
||||
{HookStart, [{Mod, Func, Arity, CallbackStart} | Callbacks]} = maps:get({Hook, Host}, TimingMap),
|
||||
maps:get(output_for_each_callback, maps:get(timing, EventHandlerOpts, #{}), false) andalso tracing_output(
|
||||
EventHandlerOpts,
|
||||
"(~0p|~ts|~0p|~0p) "
|
||||
++ mfa_string({Mod, Func, Arity})
|
||||
++ " took "
|
||||
++ human_readable_time_string(CallbackStop - CallbackStart)
|
||||
++ "\n",
|
||||
[Hook, Host, erlang:self(), RunType]
|
||||
),
|
||||
erlang:put(
|
||||
?TIMING_KEY,
|
||||
TimingMap#{
|
||||
{Hook, Host} => {HookStart, [{Mod, Func, Arity, CallbackStart, CallbackStop} | Callbacks]}
|
||||
}
|
||||
),
|
||||
ok;
|
||||
tracing_timing_event_handler(_, _, _, _, _, _, _) ->
|
||||
ok.
|
||||
|
||||
tracing_output(#{output_function := OutputF}, Text, Args) ->
|
||||
try
|
||||
OutputF(Text, Args)
|
||||
of
|
||||
_ ->
|
||||
ok
|
||||
catch
|
||||
?EX_RULE(E, R, St) ->
|
||||
?ERROR_MSG("Tracing output function exception(~0p): ~0p: ~0p", [E, R, St]),
|
||||
ok
|
||||
end;
|
||||
tracing_output(#{output_log_level := Output}, Text, Args) ->
|
||||
if
|
||||
Output == debug ->
|
||||
?DEBUG(Text, Args);
|
||||
true -> % info
|
||||
?INFO_MSG(Text, Args)
|
||||
end,
|
||||
ok;
|
||||
tracing_output(Opts, Text, Args) ->
|
||||
tracing_output(Opts#{output_log_level => info}, Text, Args).
|
||||
|
||||
mfa_string({_, Fun, _}) when erlang:is_function(Fun) ->
|
||||
io_lib:format("~0p", [Fun]);
|
||||
mfa_string({Mod, Func, Arity}) ->
|
||||
erlang:atom_to_list(Mod) ++ ":" ++ erlang:atom_to_list(Func) ++ "/" ++ erlang:integer_to_list(Arity).
|
||||
|
||||
human_readable_time_string(TimeNS) ->
|
||||
{Time, Unit, Decimals} =
|
||||
if
|
||||
TimeNS >= 1000000000 ->
|
||||
{TimeNS / 1000000000, "", 10};
|
||||
TimeNS >= 1000000 ->
|
||||
{TimeNS / 1000000, "m", 7};
|
||||
TimeNS >= 1000 ->
|
||||
{TimeNS / 1000, "μ", 4};
|
||||
true ->
|
||||
{TimeNS / 1, "n", 0}
|
||||
end,
|
||||
erlang:float_to_list(Time, [{decimals, Decimals}, compact]) ++ Unit ++ "s".
|
||||
|
|
|
|||
Loading…
Reference in New Issue