92 lines
3.6 KiB
Erlang
92 lines
3.6 KiB
Erlang
%% @author Bart Van Der Meerssche <bart.vandermeerssche@flukso.net>
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%% @copyright (C) 2009-2011 Bart Van Der Meerssche
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%%%
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%%% This program is free software: you can redistribute it and/or modify
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%%% it under the terms of the GNU General Public License as published by
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%%% the Free Software Foundation, either version 3 of the License, or
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%%% (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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%%% GNU General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License
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%%% along with this program. If not, see <http://www.gnu.org/licenses/>.
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%%%
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%% @doc Flukso API: /sensor resource specification
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-module(flukso_sensor).
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-author('Bart Van Der Meerssche <bart.vandermeerssche@flukso.net>').
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-export([init/1,
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allowed_methods/2,
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malformed_request/2,
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is_authorized/2,
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process_post/2]).
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-include_lib("webmachine/include/webmachine.hrl").
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-include("flukso.hrl").
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init([]) ->
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{ok, undefined}.
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% debugging
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%init(Config) ->
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% {{trace, "/tmp"}, Config}.
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allowed_methods(ReqData, State) ->
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{['POST'], ReqData, State}.
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malformed_request(ReqData, State) ->
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{_Version, ValidVersion} = check_version(wrq:get_req_header("X-Version", ReqData)),
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{_Device, ValidDevice} = check_device(wrq:get_req_header("X-Device", ReqData)),
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{_Digest, ValidDigest} = check_digest(wrq:get_req_header("X-Digest", ReqData)),
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{case {ValidVersion, ValidDevice, ValidDigest} of
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{true, true, true} -> false;
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_ -> true
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end,
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ReqData, State}.
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is_authorized(ReqData, State) ->
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{data, Result} = mysql:execute(pool, device_key, [wrq:get_req_header("X-Device", ReqData)]),
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[[Key]] = mysql:get_result_rows(Result),
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Data = wrq:req_body(ReqData),
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<<X:160/big-unsigned-integer>> = crypto:sha_mac(Key, Data),
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Digest = list_to_binary(io_lib:format("~40.16.0b", [X])),
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{case list_to_binary(wrq:get_req_header("X-Digest", ReqData)) of
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Digest -> true;
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_WrongDigest -> "access refused"
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end,
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ReqData, State}.
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% JSON: {"measurements":{"<sensor1>":[[<ts11>,<value11>],...,[<ts1m>,<value1m>]],
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% ...,
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% "<sensorn>":[[<tsn1>,<valuen1>],...,[<tsnm>,<valuenm>]]}}
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%
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% Mochijson2: {struct,[{<<"measurements">>, {struct, [{<<"<sensor1>">>, [[<ts11>,<value11>],...,[<ts1m>,<value1m>]]},
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% ...,
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% {<<"<sensorn>">>, [[<tsn1>,<valuen1>],...,[<tsnm>,<valuenm>]]}]}}]}
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%
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process_post(ReqData, State) ->
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{struct, JsonData} = mochijson2:decode(wrq:req_body(ReqData)),
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{struct, Measurements} = proplists:get_value(<<"measurements">>, JsonData),
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Ids = proplists:get_keys(Measurements),
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RrdResponse = [update_rrd(RrdSensor, proplists:get_value(RrdSensor, Measurements)) || RrdSensor <- Ids],
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JsonResponse = mochijson2:encode({struct, [{<<"response">>, {struct, RrdResponse}}]}),
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{true , wrq:set_resp_body(JsonResponse, ReqData), State}.
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update_rrd(RrdSensor, TimeSeries) ->
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Path = "var/data/base/",
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RrdData = [[integer_to_list(Time), ":", integer_to_list(Counter), " "] || [Time, Counter] <- TimeSeries],
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%debugging: io:format("~s~n", [[Path, [binary_to_list(RrdSensor)|".rrd"], " ", RrdData]]),
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case erlrrd:update([Path, [binary_to_list(RrdSensor)|".rrd"], " ", RrdData]) of
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{ok, _RrdResponse} -> {RrdSensor, <<"ok">>};
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{error, RrdResponse} -> {RrdSensor, list_to_binary(RrdResponse)}
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end.
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