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#include <Server/PrometheusRequestHandler.h>
#include <IO/HTTPCommon.h>
#include <Server/HTTP/WriteBufferFromHTTPServerResponse.h>
#include <Server/HTTPHandlerFactory.h>
#include <Server/IServer.h>
#include <Common/CurrentMetrics.h>
#include <Common/Exception.h>
#include <Common/ProfileEvents.h>
#include <Poco/Util/LayeredConfiguration.h>
namespace DB
{
void PrometheusRequestHandler::handleRequest(HTTPServerRequest & request, HTTPServerResponse & response)
{
try
{
const auto & config = server.config();
unsigned keep_alive_timeout = config.getUInt("keep_alive_timeout", 10);
setResponseDefaultHeaders(response, keep_alive_timeout);
response.setContentType("text/plain; version=0.0.4; charset=UTF-8");
WriteBufferFromHTTPServerResponse wb(response, request.getMethod() == Poco::Net::HTTPRequest::HTTP_HEAD, keep_alive_timeout);
try
{
metrics_writer.write(wb);
wb.finalize();
}
catch (...)
{
wb.finalize();
}
}
catch (...)
{
tryLogCurrentException("PrometheusRequestHandler");
}
}
HTTPRequestHandlerFactoryPtr
createPrometheusHandlerFactory(IServer & server,
const Poco::Util::AbstractConfiguration & config,
AsynchronousMetrics & async_metrics,
const std::string & config_prefix)
{
auto factory = std::make_shared<HandlingRuleHTTPHandlerFactory<PrometheusRequestHandler>>(
server, PrometheusMetricsWriter(config, config_prefix + ".handler", async_metrics));
factory->addFiltersFromConfig(config, config_prefix);
return factory;
}
HTTPRequestHandlerFactoryPtr
createPrometheusMainHandlerFactory(IServer & server,
const Poco::Util::AbstractConfiguration & config,
AsynchronousMetrics & async_metrics,
const std::string & name)
{
auto factory = std::make_shared<HTTPRequestHandlerFactoryMain>(name);
auto handler = std::make_shared<HandlingRuleHTTPHandlerFactory<PrometheusRequestHandler>>(
server, PrometheusMetricsWriter(config, "prometheus", async_metrics));
handler->attachStrictPath(config.getString("prometheus.endpoint", "/metrics"));
handler->allowGetAndHeadRequest();
factory->addHandler(handler);
return factory;
}
}
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