mirror of
https://github.com/matrix-construct/construct
synced 2024-11-25 00:02:34 +01:00
123 lines
2.5 KiB
C++
123 lines
2.5 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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namespace ircd::stats
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{
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static const_buffer print_item(stats::item<void> &item, const mutable_buffer &, const time_t &);
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static void each_item(resource::response::chunked &, stats::item<void> &, window_buffer &, const time_t &);
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static resource::response get_stats(client &, const resource::request &);
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extern resource::method method_get;
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extern resource stats_resource;
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}
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ircd::mapi::header
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IRCD_MODULE
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{
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"Prometheus Metrics"
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};
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decltype(ircd::stats::stats_resource)
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ircd::stats::stats_resource
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{
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"/stats",
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{
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"Prometheus Metrics"
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}
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};
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decltype(ircd::stats::method_get)
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ircd::stats::method_get
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{
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stats_resource, "GET", get_stats
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};
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ircd::resource::response
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ircd::stats::get_stats(client &client,
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const resource::request &request)
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{
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resource::response::chunked response
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{
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client, http::OK, "text/plain"
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};
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window_buffer buf
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{
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response.buf
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};
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const time_t ts
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{
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ircd::time<milliseconds>()
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};
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for(const auto &item : items)
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each_item(response, *item, buf, ts);
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const auto flushed
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{
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response.flush(buf.completed())
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};
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buf.shift(size(flushed));
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assert(!buf.consumed());
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return response;
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}
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void
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ircd::stats::each_item(resource::response::chunked &response,
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stats::item<void> &item,
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window_buffer &buf,
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const time_t &ts)
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{
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buf([&item, &ts]
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(const mutable_buffer &buf)
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{
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return print_item(item, buf, ts);
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});
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if(buf.remaining() >= 1_KiB)
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return;
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const auto completed
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{
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buf.completed()
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};
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const auto flushed
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{
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response.flush(completed)
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};
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buf.shift(size(flushed));
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}
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ircd::const_buffer
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ircd::stats::print_item(stats::item<void> &item,
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const mutable_buffer &buf,
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const time_t &ts)
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{
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char name[2][128], val[64];
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const string_view _name
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{
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replace(name[0], item.name, '.', '_')
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};
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return string_view
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{
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data(buf), size_t(::snprintf
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(
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data(buf), size(buf), "%s %s %lu\n",
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data(strlcpy(name[1], _name)),
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data(string(val, item)),
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ts
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))
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};
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}
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