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Remove not needed file.

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Nikolai Kochetov 2021-02-19 11:52:33 +03:00
parent b9d6df9618
commit 7d1119680e
1 changed files with 0 additions and 145 deletions
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145
src/Client/PacketReceiver.h
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@ -1,145 +0,0 @@
#pragma once
#if defined(OS_LINUX)
#include <Client/IConnections.h>
#include <Common/FiberStack.h>
#include <Common/Fiber.h>
#include <Common/Epoll.h>
#include <Common/TimerDescriptor.h>
namespace DB
{
/// Class for nonblocking packet receiving. It runs connection->receivePacket
/// in fiber and sets special read callback which is called when
/// reading from socket blocks. When read callback is called,
/// socket and receive timeout are added in epoll and execution returns to the main program.
/// So, you can poll this epoll file descriptor to determine when to resume
/// packet receiving (beside polling epoll descriptor, you also need to check connection->hasPendingData(),
/// because small packet can be read in buffer with the previous one, so new packet will be ready in buffer,
/// but there is no data socket to poll).
class PacketReceiver
{
public:
PacketReceiver(Connection * connection_) : connection(connection_)
{
epoll.add(receive_timeout.getDescriptor());
epoll.add(connection->getSocket()->impl()->sockfd());
fiber = boost::context::fiber(std::allocator_arg_t(), fiber_stack, Routine{*this});
}
/// Resume packet receiving.
void resume()
{
/// If there is no pending data, check receive timeout.
if (!connection->hasReadPendingData() && !checkReceiveTimeout())
return;
fiber = std::move(fiber).resume();
if (exception)
std::rethrow_exception(std::move(exception));
}
void cancel()
{
Fiber to_destroy = std::move(fiber);
connection = nullptr;
}
Packet getPacket() { return std::move(packet); }
int getFileDescriptor() const { return epoll.getFileDescriptor(); }
bool isPacketReady() const { return !is_read_in_process; }
bool isReceiveTimeoutExpired() const { return is_receive_timeout_expired; }
private:
/// When epoll file descriptor is ready, check if it's an expired timeout
bool checkReceiveTimeout()
{
bool is_socket_ready = false;
is_receive_timeout_expired = false;
epoll_event events[2];
events[0].data.fd = events[1].data.fd = -1;
size_t ready_count = epoll.getManyReady(2, events, true);
for (size_t i = 0; i != ready_count; ++i)
{
if (events[i].data.fd == connection->getSocket()->impl()->sockfd())
is_socket_ready = true;
if (events[i].data.fd == receive_timeout.getDescriptor())
is_receive_timeout_expired = true;
}
if (is_receive_timeout_expired && !is_socket_ready)
{
receive_timeout.reset();
return false;
}
return true;
}
struct Routine
{
PacketReceiver & receiver;
struct ReadCallback
{
PacketReceiver & receiver;
Fiber & sink;
void operator()(int, const Poco::Timespan & timeout, const std::string &)
{
receiver.receive_timeout.setRelative(timeout);
receiver.is_read_in_process = true;
sink = std::move(sink).resume();
receiver.is_read_in_process = false;
receiver.receive_timeout.reset();
}
};
Fiber operator()(Fiber && sink)
{
try
{
AsyncCallbackSetter async_setter(receiver.connection, ReadCallback{receiver, sink});
while (true)
{
receiver.packet = receiver.connection->receivePacket();
sink = std::move(sink).resume();
}
}
catch (const boost::context::detail::forced_unwind &)
{
/// This exception is thrown by fiber implementation in case if fiber is being deleted but hasn't exited
/// It should not be caught or it will segfault.
/// Other exceptions must be caught
throw;
}
catch (...)
{
receiver.exception = std::current_exception();
}
return std::move(sink);
}
};
Connection * connection;
TimerDescriptor receive_timeout;
Epoll epoll;
Fiber fiber;
FiberStack fiber_stack;
Packet packet;
bool is_read_in_process = false;
bool is_receive_timeout_expired = false;
std::exception_ptr exception;
};
}
#endif