ClickHouse/dbms/IO/ReadBufferFromPocoSocket.cpp

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#include <Poco/Net/NetException.h>
#include <IO/ReadBufferFromPocoSocket.h>
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#include <Common/Exception.h>
#include <Common/NetException.h>
#include <Common/Stopwatch.h>
namespace ProfileEvents
{
extern const Event NetworkReceiveElapsedMicroseconds;
}
namespace DB
{
namespace ErrorCodes
{
extern const int NETWORK_ERROR;
extern const int SOCKET_TIMEOUT;
extern const int CANNOT_READ_FROM_SOCKET;
}
bool ReadBufferFromPocoSocket::nextImpl()
{
ssize_t bytes_read = 0;
Stopwatch watch;
/// Add more details to exceptions.
try
{
bytes_read = socket.impl()->receiveBytes(internal_buffer.begin(), internal_buffer.size());
}
catch (const Poco::Net::NetException & e)
{
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throw NetException(e.displayText() + ", while reading from socket (" + peer_address.toString() + ")", ErrorCodes::NETWORK_ERROR);
}
catch (const Poco::TimeoutException &)
{
throw NetException("Timeout exceeded while reading from socket (" + peer_address.toString() + ")", ErrorCodes::SOCKET_TIMEOUT);
}
catch (const Poco::IOException & e)
{
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throw NetException(e.displayText() + ", while reading from socket (" + peer_address.toString() + ")", ErrorCodes::NETWORK_ERROR);
}
if (bytes_read < 0)
throw NetException("Cannot read from socket (" + peer_address.toString() + ")", ErrorCodes::CANNOT_READ_FROM_SOCKET);
/// NOTE: it is quite inaccurate on high loads since the thread could be replaced by another one
ProfileEvents::increment(ProfileEvents::NetworkReceiveElapsedMicroseconds, watch.elapsedMicroseconds());
if (bytes_read)
working_buffer.resize(bytes_read);
else
return false;
return true;
}
ReadBufferFromPocoSocket::ReadBufferFromPocoSocket(Poco::Net::Socket & socket_, size_t buf_size)
: BufferWithOwnMemory<ReadBuffer>(buf_size), socket(socket_), peer_address(socket.peerAddress())
{
}
bool ReadBufferFromPocoSocket::poll(size_t timeout_microseconds)
{
return offset() != buffer().size() || socket.poll(timeout_microseconds, Poco::Net::Socket::SELECT_READ | Poco::Net::Socket::SELECT_ERROR);
}
}