Packages
prometheus
1.0.0
6.1.3
6.1.2
6.1.1
6.1.0
6.0.3
6.0.2
6.0.1
6.0.0
5.1.1
5.1.0
5.0.0
4.13.0
retired
4.12.0
4.11.0
4.10.0
4.9.1
4.9.0
4.8.2
4.8.1
4.8.0
4.6.0
4.5.0
4.4.1
4.4.0
4.3.0
4.2.2
4.2.0
4.1.0
4.0.1
4.0.0
3.5.1
3.5.0
3.4.6
3.4.5
3.4.4
3.4.3
3.4.2
3.4.1
3.4.0
3.3.2
3.3.1
3.3.0
3.2.3
3.2.2
3.2.1
3.1.1
3.1.0
3.0.1
3.0.0
3.0.0-rc1
3.0.0-alpha9
3.0.0-alpha8
3.0.0-alpha7
3.0.0-alpha6
3.0.0-alpha5
3.0.0-alpha4
3.0.0-alpha3
3.0.0-alpha2
3.0.0-alpha10
3.0.0-alpha1
2.2.0
2.1.0
2.0.0
1.7.0
1.6.0
1.5.0
1.0.2
1.0.1
1.0.0
0.2.0
0.1.3
0.1.2
0.1.1
0.1.0
Prometheus.io client in Erlang
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Files
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Files
src/formats/prometheus_protobuf_format.erl
-module(prometheus_protobuf_format).
-export([content_type/0,
format/0,
format/1]).
-include("prometheus.hrl").
-include("prometheus_model.hrl").
-behaviour(prometheus_format).
%%====================================================================
%% Format API
%%====================================================================
content_type() ->
<<"application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=delimited">>.
format() ->
format(default).
format(Registry) ->
{ok, Fd} = ram_file:open("", [write,read,binary]),
prometheus_registry:collect(Registry, fun (_, Collector) ->
registry_collect_callback(Fd, Registry, Collector)
end),
{ok, Size} = ram_file:get_size(Fd),
{ok, Buf} = file:pread(Fd, 0, Size),
ok = file:close(Fd),
Buf.
%%====================================================================
%% Private Parts
%%====================================================================
registry_collect_callback(Fd, Registry, Collector) ->
Collector:collect_mf(
fun (MF) ->
file:write(Fd, delimited_encode_mf(MF))
end,
Registry).
delimited_encode_mf(MF) ->
IoRec = prometheus_model:encode_msg(MF),
Size = iolist_size(IoRec),
[e_varint(Size, <<>>), IoRec].
e_varint(N, Bin) when N =< 127 -> <<Bin/binary, N>>;
e_varint(N, Bin) ->
Bin2 = <<Bin/binary, (N band 127 bor 128)>>,
e_varint(N bsr 7, Bin2).