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