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0d1ea05ff6
Fast shared mutex integration
91 lines
2.2 KiB
C++
91 lines
2.2 KiB
C++
#pragma once
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#include <IO/ReadBuffer.h>
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#include <IO/WriteBuffer.h>
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#include <IO/ReadBufferFromString.h>
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#include <IO/ReadHelpers.h>
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#include <IO/WriteBufferFromString.h>
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#include <IO/WriteHelpers.h>
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#include <Common/ActionBlocker.h>
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#include <Common/SharedMutex.h>
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#include <base/types.h>
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#include <atomic>
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#include <map>
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#include <utility>
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namespace zkutil
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{
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class ZooKeeper;
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using ZooKeeperPtr = std::shared_ptr<ZooKeeper>;
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}
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int DUPLICATE_INTERSERVER_IO_ENDPOINT;
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extern const int NO_SUCH_INTERSERVER_IO_ENDPOINT;
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}
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class HTMLForm;
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class HTTPServerResponse;
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/** Query processor from other servers.
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*/
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class InterserverIOEndpoint
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{
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public:
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virtual std::string getId(const std::string & path) const = 0;
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virtual void processQuery(const HTMLForm & params, ReadBuffer & body, WriteBuffer & out, HTTPServerResponse & response) = 0;
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virtual ~InterserverIOEndpoint() = default;
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/// You need to stop the data transfer if blocker is activated.
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ActionBlocker blocker;
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SharedMutex rwlock;
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};
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using InterserverIOEndpointPtr = std::shared_ptr<InterserverIOEndpoint>;
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/** Here you can register a service that processes requests from other servers.
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* Used to transfer chunks in ReplicatedMergeTree.
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*/
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class InterserverIOHandler
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{
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public:
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void addEndpoint(const String & name, InterserverIOEndpointPtr endpoint)
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{
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std::lock_guard lock(mutex);
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bool inserted = endpoint_map.try_emplace(name, std::move(endpoint)).second;
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if (!inserted)
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throw Exception(ErrorCodes::DUPLICATE_INTERSERVER_IO_ENDPOINT, "Duplicate interserver IO endpoint: {}", name);
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}
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bool removeEndpointIfExists(const String & name)
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{
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std::lock_guard lock(mutex);
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return endpoint_map.erase(name);
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}
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InterserverIOEndpointPtr getEndpoint(const String & name) const
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try
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{
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std::lock_guard lock(mutex);
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return endpoint_map.at(name);
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}
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catch (...)
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{
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throw Exception(ErrorCodes::NO_SUCH_INTERSERVER_IO_ENDPOINT, "No interserver IO endpoint named {}", name);
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}
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private:
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using EndpointMap = std::map<String, InterserverIOEndpointPtr>;
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EndpointMap endpoint_map;
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mutable std::mutex mutex;
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};
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}
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