ClickHouse/dbms/include/DB/IO/ReadBufferFromPocoSocket.h
2013-10-20 07:02:23 +00:00

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#pragma once
#include <Poco/Net/Socket.h>
#include <Poco/Net/NetException.h>
#include <DB/Core/Exception.h>
#include <DB/Core/ErrorCodes.h>
#include <DB/IO/ReadBuffer.h>
#include <DB/IO/BufferWithOwnMemory.h>
namespace DB
{
/** Работает с готовым Poco::Net::Socket. Операции блокирующие.
*/
class ReadBufferFromPocoSocket : public BufferWithOwnMemory<ReadBuffer>
{
protected:
Poco::Net::Socket & socket;
bool nextImpl()
{
ssize_t bytes_read = 0;
/// Добавляем в эксепшены более подробную информацию.
try
{
bytes_read = socket.impl()->receiveBytes(internal_buffer.begin(), internal_buffer.size());
}
catch (Poco::Net::NetException & e)
{
throw Exception(e.displayText(), " while reading from socket (" + socket.address().toString() + ")", ErrorCodes::NETWORK_ERROR);
}
catch (Poco::TimeoutException & e)
{
throw Exception("Timeout exceeded while reading from socket (" + socket.address().toString() + ")", ErrorCodes::SOCKET_TIMEOUT);
}
if (bytes_read < 0)
throw Exception("Cannot read from socket (" + socket.address().toString() + ")", ErrorCodes::CANNOT_READ_FROM_SOCKET);
if (bytes_read)
working_buffer.resize(bytes_read);
else
return false;
return true;
}
public:
ReadBufferFromPocoSocket(Poco::Net::Socket & socket_, size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE)
: BufferWithOwnMemory<ReadBuffer>(buf_size), socket(socket_) {}
bool poll(size_t timeout_microseconds)
{
return offset() != buffer().size() || socket.poll(timeout_microseconds, Poco::Net::Socket::SELECT_READ | Poco::Net::Socket::SELECT_ERROR);
}
};
}