ClickHouse/programs/server/HTTPHandlerFactory.cpp
Alexander Tokmakov aeac8cb621 fix
2020-04-28 10:19:37 +03:00

166 lines
7.2 KiB
C++

#include "HTTPHandlerFactory.h"
#include <re2/re2.h>
#include <re2/stringpiece.h>
#include <common/find_symbols.h>
#include <Poco/StringTokenizer.h>
#include "HTTPHandler.h"
#include "NotFoundHandler.h"
#include "StaticRequestHandler.h"
#include "ReplicasStatusHandler.h"
#include "InterserverIOHTTPHandler.h"
#include "PrometheusRequestHandler.h"
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int UNKNOWN_ELEMENT_IN_CONFIG;
extern const int INVALID_CONFIG_PARAMETER;
}
HTTPRequestHandlerFactoryMain::HTTPRequestHandlerFactoryMain(const std::string & name_)
: log(&Logger::get(name_)), name(name_)
{
}
Poco::Net::HTTPRequestHandler * HTTPRequestHandlerFactoryMain::createRequestHandler(const Poco::Net::HTTPServerRequest & request) // override
{
LOG_TRACE(log, "HTTP Request for " << name << ". "
<< "Method: " << request.getMethod()
<< ", Address: " << request.clientAddress().toString()
<< ", User-Agent: " << (request.has("User-Agent") ? request.get("User-Agent") : "none")
<< (request.hasContentLength() ? (", Length: " + std::to_string(request.getContentLength())) : (""))
<< ", Content Type: " << request.getContentType()
<< ", Transfer Encoding: " << request.getTransferEncoding());
for (auto & handler_factory : child_factories)
{
auto handler = handler_factory->createRequestHandler(request);
if (handler != nullptr)
return handler;
}
if (request.getMethod() == Poco::Net::HTTPRequest::HTTP_GET
|| request.getMethod() == Poco::Net::HTTPRequest::HTTP_HEAD
|| request.getMethod() == Poco::Net::HTTPRequest::HTTP_POST)
{
return new NotFoundHandler;
}
return nullptr;
}
HTTPRequestHandlerFactoryMain::~HTTPRequestHandlerFactoryMain()
{
while (!child_factories.empty())
{
delete child_factories.back();
child_factories.pop_back();
}
}
HTTPRequestHandlerFactoryMain::TThis * HTTPRequestHandlerFactoryMain::addHandler(Poco::Net::HTTPRequestHandlerFactory * child_factory)
{
child_factories.emplace_back(child_factory);
return this;
}
static inline auto createHandlersFactoryFromConfig(IServer & server, const std::string & name, const String & prefix)
{
auto main_handler_factory = new HTTPRequestHandlerFactoryMain(name);
try
{
Poco::Util::AbstractConfiguration::Keys keys;
server.config().keys(prefix, keys);
for (const auto & key : keys)
{
if (!startsWith(key, "rule"))
throw Exception("Unknown element in config: " + prefix + "." + key + ", must be 'rule'", ErrorCodes::UNKNOWN_ELEMENT_IN_CONFIG);
const auto & handler_type = server.config().getString(prefix + "." + key + ".handler.type", "");
if (handler_type == "static")
main_handler_factory->addHandler(createStaticHandlerFactory(server, prefix + "." + key));
else if (handler_type == "dynamic_query_handler")
main_handler_factory->addHandler(createDynamicHandlerFactory(server, prefix + "." + key));
else if (handler_type == "predefined_query_handler")
main_handler_factory->addHandler(createPredefinedHandlerFactory(server, prefix + "." + key));
else if (handler_type.empty())
throw Exception("Handler type in config is not specified here: " +
prefix + "." + key + ".handler.type", ErrorCodes::INVALID_CONFIG_PARAMETER);
else
throw Exception("Unknown handler type '" + handler_type +"' in config here: " +
prefix + "." + key + ".handler.type",ErrorCodes::INVALID_CONFIG_PARAMETER);
}
return main_handler_factory;
}
catch (...)
{
delete main_handler_factory;
throw;
}
}
static const auto ping_response_expression = "Ok.\n";
static const auto root_response_expression = "config://http_server_default_response";
static inline Poco::Net::HTTPRequestHandlerFactory * createHTTPHandlerFactory(IServer & server, const std::string & name, AsynchronousMetrics & async_metrics)
{
if (server.config().has("http_handlers"))
return createHandlersFactoryFromConfig(server, name, "http_handlers");
else
{
auto factory = (new HTTPRequestHandlerFactoryMain(name))
->addHandler((new HandlingRuleHTTPHandlerFactory<StaticRequestHandler>(server, root_response_expression))
->attachStrictPath("/")->allowGetAndHeadRequest())
->addHandler((new HandlingRuleHTTPHandlerFactory<StaticRequestHandler>(server, ping_response_expression))
->attachStrictPath("/ping")->allowGetAndHeadRequest())
->addHandler((new HandlingRuleHTTPHandlerFactory<ReplicasStatusHandler>(server))
->attachNonStrictPath("/replicas_status")->allowGetAndHeadRequest())
->addHandler((new HandlingRuleHTTPHandlerFactory<DynamicQueryHandler>(server, "query"))->allowPostAndGetParamsRequest());
if (server.config().has("prometheus") && server.config().getInt("prometheus.port", 0) == 0)
factory->addHandler((new HandlingRuleHTTPHandlerFactory<PrometheusRequestHandler>(
server, PrometheusMetricsWriter(server.config(), "prometheus", async_metrics)))
->attachStrictPath(server.config().getString("prometheus.endpoint", "/metrics"))->allowGetAndHeadRequest());
return factory;
}
}
static inline Poco::Net::HTTPRequestHandlerFactory * createInterserverHTTPHandlerFactory(IServer & server, const std::string & name)
{
return (new HTTPRequestHandlerFactoryMain(name))
->addHandler((new HandlingRuleHTTPHandlerFactory<StaticRequestHandler>(server, root_response_expression))
->attachStrictPath("/")->allowGetAndHeadRequest())
->addHandler((new HandlingRuleHTTPHandlerFactory<StaticRequestHandler>(server, ping_response_expression))
->attachStrictPath("/ping")->allowGetAndHeadRequest())
->addHandler((new HandlingRuleHTTPHandlerFactory<ReplicasStatusHandler>(server))
->attachNonStrictPath("/replicas_status")->allowGetAndHeadRequest())
->addHandler((new HandlingRuleHTTPHandlerFactory<InterserverIOHTTPHandler>(server))->allowPostAndGetParamsRequest());
}
Poco::Net::HTTPRequestHandlerFactory * createHandlerFactory(IServer & server, AsynchronousMetrics & async_metrics, const std::string & name)
{
if (name == "HTTPHandler-factory" || name == "HTTPSHandler-factory")
return createHTTPHandlerFactory(server, name, async_metrics);
else if (name == "InterserverIOHTTPHandler-factory" || name == "InterserverIOHTTPSHandler-factory")
return createInterserverHTTPHandlerFactory(server, name);
else if (name == "PrometheusHandler-factory")
return (new HTTPRequestHandlerFactoryMain(name))->addHandler((new HandlingRuleHTTPHandlerFactory<PrometheusRequestHandler>(
server, PrometheusMetricsWriter(server.config(), "prometheus", async_metrics)))
->attachStrictPath(server.config().getString("prometheus.endpoint", "/metrics"))->allowGetAndHeadRequest());
throw Exception("LOGICAL ERROR: Unknown HTTP handler factory name.", ErrorCodes::LOGICAL_ERROR);
}
}