14010370149

Committed 22 Mar 2025 04:28PM UTC coverage: 98.534%. Remained the same

Build # 14010370149

Build Type

push

github

Committed by

gjasny

Commit Message

ci: fix coverage generation

Run Details

874 of 887 relevant lines covered (98.53%)

49857.53 hits per line

Source File
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97.98

/pull/src/handler.cc

#include "handler.h"

#include <algorithm>
#include <chrono>
#include <cstring>
#include <iterator>
#include <string>

#ifdef HAVE_ZLIB
#include <zconf.h>
#include <zlib.h>
#endif

#include "civetweb.h"
#include "metrics_collector.h"
#include "prometheus/counter.h"
#include "prometheus/metric_family.h"
#include "prometheus/summary.h"
#include "prometheus/text_serializer.h"

#if CIVETWEB_VERSION_MAJOR < 1 || \
    (CIVETWEB_VERSION_MAJOR == 1 && CIVETWEB_VERSION_MINOR < 14)
// https://github.com/civetweb/civetweb/issues/954
#error "Civetweb version 1.14 or higher required"
#endif

namespace prometheus {
namespace detail {

MetricsHandler::MetricsHandler(Registry& registry)
    : bytes_transferred_family_(
          BuildCounter()
              .Name("exposer_transferred_bytes_total")
              .Help("Transferred bytes to metrics services")
              .Register(registry)),
      bytes_transferred_(bytes_transferred_family_.Add({})),
      num_scrapes_family_(BuildCounter()
                              .Name("exposer_scrapes_total")
                              .Help("Number of times metrics were scraped")
                              .Register(registry)),
      num_scrapes_(num_scrapes_family_.Add({})),
      request_latencies_family_(
          BuildSummary()
              .Name("exposer_request_latencies")
              .Help("Latencies of serving scrape requests, in microseconds")
              .Register(registry)),
      request_latencies_(request_latencies_family_.Add(
          {}, Summary::Quantiles{{0.5, 0.05}, {0.9, 0.01}, {0.99, 0.001}})) {}

#ifdef HAVE_ZLIB
static bool IsEncodingAccepted(struct mg_connection* conn,
                               const char* encoding) {
  auto accept_encoding = mg_get_header(conn, "Accept-Encoding");
  if (!accept_encoding) {
    return false;
  }
  return std::strstr(accept_encoding, encoding) != nullptr;
}

static std::vector<Byte> GZipCompress(const std::string& input) {
  auto zs = z_stream{};
  auto windowSize = 16 + MAX_WBITS;
  auto memoryLevel = 9;

  if (deflateInit2(&zs, Z_DEFAULT_COMPRESSION, Z_DEFLATED, windowSize,
                   memoryLevel, Z_DEFAULT_STRATEGY) != Z_OK) {
    return {};
  }

  zs.next_in = (Bytef*)input.data();
  zs.avail_in = input.size();

  int ret;
  std::vector<Byte> output;
  output.reserve(input.size() / 2u);

  do {
    static const auto outputBytesPerRound = std::size_t{32768};

    zs.avail_out = outputBytesPerRound;
    output.resize(zs.total_out + zs.avail_out);
    zs.next_out = reinterpret_cast<Bytef*>(output.data() + zs.total_out);

    ret = deflate(&zs, Z_FINISH);

    output.resize(zs.total_out);
  } while (ret == Z_OK);

  deflateEnd(&zs);

  if (ret != Z_STREAM_END) {
    return {};
  }

  return output;
}
#endif

static std::size_t WriteResponse(struct mg_connection* conn,
                                 const std::string& body) {
  mg_printf(conn,
            "HTTP/1.1 200 OK\r\n"
            "Content-Type: text/plain; charset=utf-8\r\n");

#ifdef HAVE_ZLIB
  auto acceptsGzip = IsEncodingAccepted(conn, "gzip");

  if (acceptsGzip) {
    auto compressed = GZipCompress(body);
    if (!compressed.empty()) {
      mg_printf(conn,
                "Content-Encoding: gzip\r\n"
                "Content-Length: %lu\r\n\r\n",
                static_cast<unsigned long>(compressed.size()));
      mg_write(conn, compressed.data(), compressed.size());
      return compressed.size();
    }
  }
#endif

  mg_printf(conn, "Content-Length: %lu\r\n\r\n",
            static_cast<unsigned long>(body.size()));
  mg_write(conn, body.data(), body.size());
  return body.size();
}

void MetricsHandler::RegisterCollectable(
    const std::weak_ptr<Collectable>& collectable) {
  std::lock_guard<std::mutex> lock{collectables_mutex_};
  CleanupStalePointers(collectables_);
  collectables_.push_back(collectable);
}

void MetricsHandler::RemoveCollectable(
    const std::weak_ptr<Collectable>& collectable) {
  std::lock_guard<std::mutex> lock{collectables_mutex_};

  auto locked = collectable.lock();
  auto same_pointer = [&locked](const std::weak_ptr<Collectable>& candidate) {
    return locked == candidate.lock();
  };

  collectables_.erase(std::remove_if(std::begin(collectables_),
                                     std::end(collectables_), same_pointer),
                      std::end(collectables_));
}

bool MetricsHandler::handleGet(CivetServer*, struct mg_connection* conn) {
  auto start_time_of_request = std::chrono::steady_clock::now();

  std::vector<MetricFamily> metrics;

  {
    std::lock_guard<std::mutex> lock{collectables_mutex_};
    metrics = CollectMetrics(collectables_);
  }

  const TextSerializer serializer;

  auto bodySize = WriteResponse(conn, serializer.Serialize(metrics));

  auto stop_time_of_request = std::chrono::steady_clock::now();
  auto duration = std::chrono::duration_cast<std::chrono::microseconds>(
      stop_time_of_request - start_time_of_request);
  request_latencies_.Observe(duration.count());

  bytes_transferred_.Increment(bodySize);
  num_scrapes_.Increment();
  return true;
}

void MetricsHandler::CleanupStalePointers(
    std::vector<std::weak_ptr<Collectable>>& collectables) {
  collectables.erase(
      std::remove_if(std::begin(collectables), std::end(collectables),
                     [](const std::weak_ptr<Collectable>& candidate) {
                       return candidate.expired();
                     }),
      std::end(collectables));
}
}  // namespace detail
}  // namespace prometheus

1	#include "handler.h"
2
3	#include <algorithm>
4	#include <chrono>
5	#include <cstring>
6	#include <iterator>
7	#include <string>
8
9	#ifdef HAVE_ZLIB
10	#include <zconf.h>
11	#include <zlib.h>
12	#endif
13
14	#include "civetweb.h"
15	#include "metrics_collector.h"
16	#include "prometheus/counter.h"
17	#include "prometheus/metric_family.h"
18	#include "prometheus/summary.h"
19	#include "prometheus/text_serializer.h"
20
21	#if CIVETWEB_VERSION_MAJOR < 1 \|\| \
22	(CIVETWEB_VERSION_MAJOR == 1 && CIVETWEB_VERSION_MINOR < 14)
23	// https://github.com/civetweb/civetweb/issues/954
24	#error "Civetweb version 1.14 or higher required"
25	#endif
26
27	namespace prometheus {
28	namespace detail {
29
30	MetricsHandler::MetricsHandler(Registry& registry)	13✔
31	: bytes_transferred_family_(	13✔
32	BuildCounter()	13✔
33	.Name("exposer_transferred_bytes_total")	26✔
34	.Help("Transferred bytes to metrics services")	26✔
35	.Register(registry)),	13✔
36	bytes_transferred_(bytes_transferred_family_.Add({})),	13✔
37	num_scrapes_family_(BuildCounter()	13✔
38	.Name("exposer_scrapes_total")	26✔
39	.Help("Number of times metrics were scraped")	26✔
40	.Register(registry)),	13✔
41	num_scrapes_(num_scrapes_family_.Add({})),	13✔
42	request_latencies_family_(	13✔
43	BuildSummary()	13✔
44	.Name("exposer_request_latencies")	26✔
45	.Help("Latencies of serving scrape requests, in microseconds")	26✔
46	.Register(registry)),	13✔
47	request_latencies_(request_latencies_family_.Add(	13✔
48	{}, Summary::Quantiles{{0.5, 0.05}, {0.9, 0.01}, {0.99, 0.001}})) {}	65✔
49
50	#ifdef HAVE_ZLIB
51	static bool IsEncodingAccepted(struct mg_connection* conn,	8✔
52	const char* encoding) {
53	auto accept_encoding = mg_get_header(conn, "Accept-Encoding");	8✔
54	if (!accept_encoding) {	8✔
55	return false;	7✔
56	}
57	return std::strstr(accept_encoding, encoding) != nullptr;	1✔
58	}
59
60	static std::vector<Byte> GZipCompress(const std::string& input) {	1✔
61	auto zs = z_stream{};	1✔
62	auto windowSize = 16 + MAX_WBITS;	1✔
63	auto memoryLevel = 9;	1✔
64
65	if (deflateInit2(&zs, Z_DEFAULT_COMPRESSION, Z_DEFLATED, windowSize,	1✔
66	memoryLevel, Z_DEFAULT_STRATEGY) != Z_OK) {	1✔
67	return {};	×
68	}
69
70	zs.next_in = (Bytef*)input.data();	1✔
71	zs.avail_in = input.size();	1✔
72
73	int ret;
74	std::vector<Byte> output;	1✔
75	output.reserve(input.size() / 2u);	1✔
76
77	do {
78	static const auto outputBytesPerRound = std::size_t{32768};
79
80	zs.avail_out = outputBytesPerRound;	1✔
81	output.resize(zs.total_out + zs.avail_out);	1✔
82	zs.next_out = reinterpret_cast<Bytef*>(output.data() + zs.total_out);	1✔
83
84	ret = deflate(&zs, Z_FINISH);	1✔
85
86	output.resize(zs.total_out);	1✔
87	} while (ret == Z_OK);	1✔
88
89	deflateEnd(&zs);	1✔
90
91	if (ret != Z_STREAM_END) {	1✔
92	return {};	×
93	}
94
95	return output;	1✔
96	}	1✔
97	#endif
98
99	static std::size_t WriteResponse(struct mg_connection* conn,	8✔
100	const std::string& body) {
101	mg_printf(conn,	8✔
102	"HTTP/1.1 200 OK\r\n"
103	"Content-Type: text/plain; charset=utf-8\r\n");
104
105	#ifdef HAVE_ZLIB
106	auto acceptsGzip = IsEncodingAccepted(conn, "gzip");	8✔
107
108	if (acceptsGzip) {	8✔
109	auto compressed = GZipCompress(body);	1✔
110	if (!compressed.empty()) {	1✔
111	mg_printf(conn,	1✔
112	"Content-Encoding: gzip\r\n"
113	"Content-Length: %lu\r\n\r\n",
114	static_cast<unsigned long>(compressed.size()));	1✔
115	mg_write(conn, compressed.data(), compressed.size());	1✔
116	return compressed.size();	1✔
117	}
118	}	1✔
119	#endif
120
121	mg_printf(conn, "Content-Length: %lu\r\n\r\n",	7✔
122	static_cast<unsigned long>(body.size()));	7✔
123	mg_write(conn, body.data(), body.size());	7✔
124	return body.size();	7✔
125	}
126
127	void MetricsHandler::RegisterCollectable(	27✔
128	const std::weak_ptr<Collectable>& collectable) {
129	std::lock_guard<std::mutex> lock{collectables_mutex_};	27✔
130	CleanupStalePointers(collectables_);	27✔
131	collectables_.push_back(collectable);	27✔
132	}	27✔
133
134	void MetricsHandler::RemoveCollectable(	1✔
135	const std::weak_ptr<Collectable>& collectable) {
136	std::lock_guard<std::mutex> lock{collectables_mutex_};	1✔
137
138	auto locked = collectable.lock();	1✔
139	auto same_pointer = [&locked](const std::weak_ptr<Collectable>& candidate) {	2✔
140	return locked == candidate.lock();	2✔
141	};	1✔
142
143	collectables_.erase(std::remove_if(std::begin(collectables_),	2✔
144	std::end(collectables_), same_pointer),	1✔
145	std::end(collectables_));	2✔
146	}	1✔
147
148	bool MetricsHandler::handleGet(CivetServer, struct mg_connection conn) {	8✔
149	auto start_time_of_request = std::chrono::steady_clock::now();	8✔
150
151	std::vector<MetricFamily> metrics;	8✔
152
153	{
154	std::lock_guard<std::mutex> lock{collectables_mutex_};	8✔
155	metrics = CollectMetrics(collectables_);	8✔
156	}	8✔
157
158	const TextSerializer serializer;	8✔
159
160	auto bodySize = WriteResponse(conn, serializer.Serialize(metrics));	8✔
161
162	auto stop_time_of_request = std::chrono::steady_clock::now();	8✔
163	auto duration = std::chrono::duration_cast<std::chrono::microseconds>(	8✔
164	stop_time_of_request - start_time_of_request);	8✔
165	request_latencies_.Observe(duration.count());	8✔
166
167	bytes_transferred_.Increment(bodySize);	8✔
168	num_scrapes_.Increment();	8✔
169	return true;	8✔
170	}	8✔
171
172	void MetricsHandler::CleanupStalePointers(	27✔
173	std::vector<std::weak_ptr<Collectable>>& collectables) {
174	collectables.erase(	27✔
175	std::remove_if(std::begin(collectables), std::end(collectables),	27✔
176	[](const std::weak_ptr<Collectable>& candidate) {	15✔
177	return candidate.expired();	15✔
178	}),
179	std::end(collectables));	27✔
180	}	27✔
181	} // namespace detail
182	} // namespace prometheus

jupp0r / prometheus-cpp / 14010370149

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