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% Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
%
% Unless required by applicable law or agreed to in writing, software
% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
% License for the specific language governing permissions and limitations under
% the License.
-module(ctrace_config).
-vsn(1).
-behaviour(config_listener).
-export([
is_enabled/0,
update/0,
filter_module_name/1
]).
-export([
handle_config_change/5,
handle_config_terminate/3
]).
-include("ctrace.hrl").
-spec is_enabled() -> boolean().
is_enabled() ->
config:get_boolean("tracing", "enabled", false).
-spec update() -> ok.
update() ->
case is_enabled() of
true ->
maybe_start_main_tracer(?MAIN_TRACER),
CompiledFilters = get_compiled_filters(),
RemovedFilters = lists:foldl(fun({OperationId, FilterDef}, Acc) ->
case compile_filter(OperationId, FilterDef) of
true -> Acc -- [OperationId];
false -> Acc
end
end, CompiledFilters, config:get("tracing.filters")),
lists:foreach(fun(OperationId) ->
ModName = filter_module_name(OperationId),
code:delete(ModName),
code:purge(ModName)
end, RemovedFilters),
case config:get("tracing.filters", "all") of
undefined -> compile_filter("all", "(#{}) -> false");
_ -> ok
end;
false ->
jaeger_passage:stop_tracer(?MAIN_TRACER)
end,
ok.
-spec filter_module_name(atom() | string()) -> atom().
filter_module_name(OperationId) when is_atom(OperationId) ->
filter_module_name(atom_to_list(OperationId));
filter_module_name(OperationId) ->
list_to_atom("ctrace_filter_" ++ OperationId).
handle_config_change("tracing", "enabled", _, _Persist, St) ->
update(),
{ok, St};
handle_config_change("tracing.filters", _Key, _Val, _Persist, St) ->
update(),
{ok, St};
handle_config_change(_Sec, _Key, _Val, _Persist, St) ->
{ok, St}.
handle_config_terminate(_Server, _Reason, _State) ->
update().
maybe_start_main_tracer(TracerId) ->
case passage_tracer_registry:get_reporter(TracerId) of
error ->
start_main_tracer(TracerId);
_ ->
true
end.
start_main_tracer(TracerId) ->
MaxQueueLen = config:get_integer("tracing", "max_queue_len", 1024),
Sampler = jaeger_passage_sampler_queue_limit:new(
passage_sampler_all:new(), TracerId, MaxQueueLen),
ServiceName = list_to_atom(config:get("tracing", "app_name", "couchdb")),
ProtocolOptions = case config:get("tracing", "protocol", "udp") of
"udp" ->
[
{thrift_format, list_to_atom(
config:get("tracing", "thrift_format", "compact"))},
{agent_host,
config:get("tracing", "agent_host", "127.0.0.1")},
{agent_port,
config:get_integer("tracing", "agent_port", 6831)},
{protocol, udp},
{default_service_name, ServiceName}
];
"http" ++ _ ->
[
{endpoint,
config:get("tracing", "endpoint", "http://127.0.0.1:14268")},
{protocol, http},
{http_client, fun http_client/5},
{default_service_name, ServiceName}
]
end,
Options = [{default_service_name, ServiceName}|ProtocolOptions],
ok = jaeger_passage:start_tracer(TracerId, Sampler, Options).
http_client(Endpoint, Method, Headers, Body, _ReporterOptions) ->
ibrowse:send_req(Endpoint, Headers, Method, Body, []).
compile_filter(OperationId, FilterDef) ->
try
couch_log:info("Compiling filter : ~s", [OperationId]),
ctrace_dsl:compile(OperationId, FilterDef),
true
catch throw:{error, Reason} ->
couch_log:error("Cannot compile ~s :: ~s~n", [OperationId, Reason]),
false
end.
get_compiled_filters() ->
lists:foldl(fun({Mod, _Path}, Acc) ->
ModStr = atom_to_list(Mod),
case ModStr of
"ctrace_filter_" ++ OpName ->
[OpName | Acc];
_ ->
Acc
end
end, [], code:all_loaded()).
|
