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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(couch_httpd_stats_handlers).
-include("couch_db.hrl").
-include("couch_stats.hrl").
-export([handle_stats_req/1]).
-import(couch_httpd,
[send_json/2,send_json/3,send_json/4,send_method_not_allowed/2,
start_json_response/2,send_chunk/2,end_json_response/1,
start_chunked_response/3, send_error/4]).
-define(b2a(V), list_to_atom(binary_to_list(V))).
-record(stats_query_args, {
range='0',
flush=false
}).
handle_stats_req(#httpd{method='GET', path_parts=[_]}=Req) ->
send_json(Req, couch_stats_aggregator:all());
handle_stats_req(#httpd{method='GET', path_parts=[_Stats, Module, Key]}=Req) ->
#stats_query_args{
range=Range,
flush=Flush
} = parse_stats_query(Req),
case Flush of
true ->
couch_stats_aggregator:time_passed();
_ -> ok
end,
Stats = couch_stats_aggregator:get_json({?b2a(Module), ?b2a(Key)}, Range),
Response = {[{Module, {[{Key, Stats}]}}]},
send_json(Req, Response);
handle_stats_req(Req) ->
send_method_not_allowed(Req, "GET").
parse_stats_query(Req) ->
lists:foldl(fun({Key,Value}, Args) ->
case {Key, Value} of
{"range", Range} ->
Args#stats_query_args{range=list_to_atom(Range)};
{"flush", "true"} ->
Args#stats_query_args{flush=true};
_Else -> % unknown key value pair, ignore.
Args
end
end, #stats_query_args{}, couch_httpd:qs(Req)).
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