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%%============================================================================== |
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%% Copyright 2019 Erlang Solutions Ltd. |
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%% |
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%% Licensed under the Apache License, Version 2.0 (the "License"); |
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%% you may not use this file except in compliance with the License. |
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%% You may obtain a copy of the License at |
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%% |
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%% http://www.apache.org/licenses/LICENSE-2.0 |
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%% |
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%% Unless required by applicable law or agreed to in writing, software |
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%% distributed under the License is distributed on an "AS IS" BASIS, |
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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%% See the License for the specific language governing permissions and |
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%% limitations under the License. |
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%%============================================================================== |
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-module(mongoose_metrics_probe). |
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-behaviour(exometer_probe). |
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-include("mongoose_logger.hrl"). |
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%% exometer_entry callbacks |
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%% exometer_probe callbacks |
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-export([ |
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behaviour/0, |
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probe_init/3, |
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probe_terminate/1, |
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probe_get_value/2, |
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probe_get_datapoints/1, |
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probe_update/2, |
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probe_reset/1, |
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probe_sample/1, |
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probe_setopts/3, |
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probe_handle_msg/2, |
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probe_code_change/3 |
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]). |
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-ignore_xref([behaviour_info/1]). |
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-type datapoint() :: atom(). |
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-callback datapoints() -> [datapoint()]. |
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-callback sample() -> #{datapoint() => integer()}. |
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-record(state, { |
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callback_module :: atom(), |
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data = #{} :: #{datapoint() => integer()}, |
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ref :: reference() | undefined |
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}). |
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-spec behaviour() -> exometer:behaviour(). |
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behaviour() -> |
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probe. |
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probe_init(_Name, _Type, Opts) -> |
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Mod = case proplists:get_value(callback_module, Opts) of |
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M when is_atom(M) -> M; |
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:-( |
M -> error({invalid_callback_module, M}) |
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end, |
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{ok, #state{callback_module = Mod, |
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data = #{}}}. |
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probe_terminate(_) -> ok. |
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probe_get_value(DPs, #state{data = Data} = S) -> |
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{ok, maps:to_list(maps:with(DPs, Data)), S}. |
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probe_get_datapoints(#state{callback_module = Mod}) -> |
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{ok, Mod:datapoints()}. |
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probe_update(_, _) -> |
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:-( |
{error, not_supported}. |
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probe_reset(S) -> |
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:-( |
{ok, S#state{data = #{}}}. |
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probe_sample(#state{callback_module = Mod, ref = undefined} = S) -> |
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{_Pid, Ref} = |
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spawn_monitor( |
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fun() -> |
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exit({sample, Mod:sample()}) |
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end), |
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{ok, S#state{ref = Ref}}; |
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probe_sample(#state{} = S) -> |
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:-( |
{ok, S}. |
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probe_setopts(_Entry, _Opts, _S) -> |
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:-( |
{error, not_supported}. |
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probe_handle_msg({'DOWN', Ref, _, _, {sample, Data}}, #state{ref = Ref} = S) -> |
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{ok, S#state{ref = undefined, data = Data}}; |
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probe_handle_msg({'DOWN', Ref, _, _, Reason}, #state{callback_module = Mod, ref = Ref} = S) -> |
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?LOG_WARNING(#{what => probe_callback_module_died, callback_module => Mod, |
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reason => Reason}), |
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{ok, S#state{ref = undefined}}; |
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probe_handle_msg(_, S) -> |
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:-( |
{ok, S}. |
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:-( |
probe_code_change(_, S, _) -> {ok, S}. |