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119 lines
3.8 KiB
C++
119 lines
3.8 KiB
C++
#include "ReplicasStatusHandler.h"
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#include <Interpreters/Context.h>
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#include <Storages/StorageReplicatedMergeTree.h>
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#include <Common/HTMLForm.h>
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#include <Common/typeid_cast.h>
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#include <Databases/IDatabase.h>
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#include <IO/HTTPCommon.h>
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#include <Poco/Net/HTTPRequestHandlerFactory.h>
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#include <Poco/Net/HTTPServerRequest.h>
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#include <Poco/Net/HTTPServerResponse.h>
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#include <Server/HTTPHandlerFactory.h>
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#include <Server/HTTPHandlerRequestFilter.h>
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namespace DB
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{
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ReplicasStatusHandler::ReplicasStatusHandler(IServer & server)
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: context(server.context())
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{
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}
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void ReplicasStatusHandler::handleRequest(Poco::Net::HTTPServerRequest & request, Poco::Net::HTTPServerResponse & response)
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{
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try
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{
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HTMLForm params(request);
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/// Even if lag is small, output detailed information about the lag.
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bool verbose = params.get("verbose", "") == "1";
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const MergeTreeSettings & settings = context.getReplicatedMergeTreeSettings();
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bool ok = true;
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WriteBufferFromOwnString message;
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auto databases = DatabaseCatalog::instance().getDatabases();
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/// Iterate through all the replicated tables.
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for (const auto & db : databases)
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{
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/// Check if database can contain replicated tables
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if (!db.second->canContainMergeTreeTables())
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continue;
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for (auto iterator = db.second->getTablesIterator(context); iterator->isValid(); iterator->next())
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{
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const auto & table = iterator->table();
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if (!table)
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continue;
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StorageReplicatedMergeTree * table_replicated = dynamic_cast<StorageReplicatedMergeTree *>(table.get());
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if (!table_replicated)
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continue;
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time_t absolute_delay = 0;
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time_t relative_delay = 0;
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table_replicated->getReplicaDelays(absolute_delay, relative_delay);
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if ((settings.min_absolute_delay_to_close && absolute_delay >= static_cast<time_t>(settings.min_absolute_delay_to_close))
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|| (settings.min_relative_delay_to_close && relative_delay >= static_cast<time_t>(settings.min_relative_delay_to_close)))
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ok = false;
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message << backQuoteIfNeed(db.first) << "." << backQuoteIfNeed(iterator->name())
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<< ":\tAbsolute delay: " << absolute_delay << ". Relative delay: " << relative_delay << ".\n";
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}
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}
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const auto & config = context.getConfigRef();
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setResponseDefaultHeaders(response, config.getUInt("keep_alive_timeout", 10));
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if (!ok)
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{
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response.setStatusAndReason(Poco::Net::HTTPResponse::HTTP_SERVICE_UNAVAILABLE);
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verbose = true;
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}
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if (verbose)
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response.send() << message.str();
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else
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{
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const char * data = "Ok.\n";
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response.sendBuffer(data, strlen(data));
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}
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}
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catch (...)
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{
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tryLogCurrentException("ReplicasStatusHandler");
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try
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{
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response.setStatusAndReason(Poco::Net::HTTPResponse::HTTP_INTERNAL_SERVER_ERROR);
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if (!response.sent())
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{
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/// We have not sent anything yet and we don't even know if we need to compress response.
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response.send() << getCurrentExceptionMessage(false) << std::endl;
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}
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}
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catch (...)
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{
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LOG_ERROR((&Poco::Logger::get("ReplicasStatusHandler")), "Cannot send exception to client");
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}
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}
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}
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Poco::Net::HTTPRequestHandlerFactory * createReplicasStatusHandlerFactory(IServer & server, const std::string & config_prefix)
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{
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return addFiltersFromConfig(new HandlingRuleHTTPHandlerFactory<ReplicasStatusHandler>(server), server.config(), config_prefix);
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}
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}
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