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dproto

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Protocols for dalmatinerdb

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dproto src dproto.erl
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src/dproto.erl 

-module(dproto).



-include_lib("mmath/include/mmath.hrl").

-include("dproto.hrl").



-export([

         metric_from_list/1,

         metric_to_list/1,

         metric_to_string/2

        ]).



-ignore_xref([

         metric_from_list/1,

         metric_to_list/1,

         metric_to_string/2

        ]).



-export_type([metric_list/0, metric/0, bucket/0]).



-type metric_list() :: [binary()].

-type metric() :: bitstring().

-type bucket() :: binary().



%%--------------------------------------------------------------------

%% @doc

%% Encodes the list representation of a metric to the binary

%% representation.

%%

%% @spec metric_from_list(metric_list()) ->

%%                               metric()

%%

%% @end

%%--------------------------------------------------------------------



-spec metric_from_list(metric_list()) ->

                              metric().



metric_from_list(Metric) when is_list(Metric) ->

    << <<(byte_size(M)):?METRIC_ELEMENT_SS/?SIZE_TYPE, M/binary>>

       || M <- Metric>>.



%%--------------------------------------------------------------------

%% @doc

%% Decodes the binary representation of a metric to the list

%% representation.

%%

%% @spec metric_to_list(metric()) ->

%%                             metric_list()

%%

%% @end

%%--------------------------------------------------------------------



-spec metric_to_list(binary()) ->

                            metric_list().



metric_to_list(Metric) when is_binary(Metric) ->

    [M || <<_Size:?METRIC_ELEMENT_SS/?SIZE_TYPE, M:_Size/binary>>

              <= Metric].



%%--------------------------------------------------------------------

%% @doc

%% Transforms a metric into a human readable string representation,

%% joining the data with a separator.

%%

%% @spec metric_to_string(metric(), binary()) ->

%%                              binary()

%%

%% @end

%%--------------------------------------------------------------------



-spec metric_to_string(metric(), binary()) ->

                              binary().



metric_to_string(Metric, Seperator) ->

    SepSize = byte_size(Seperator),

    <<Seperator:SepSize/binary, Result/binary>> =

        << <<Seperator/binary, M/binary>> ||

            <<_Size:?METRIC_ELEMENT_SS/?SIZE_TYPE, M:_Size/binary>>

                <= Metric >>,

    Result.