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/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "FullyBufferedSocket.hxx"
#include "system/SocketError.hxx"
#include "util/fifo_buffer.h"
#include <assert.h>
#include <stdint.h>
#include <string.h>
#ifndef WIN32
#include <sys/types.h>
#include <sys/socket.h>
#endif
FullyBufferedSocket::ssize_t
FullyBufferedSocket::DirectWrite(const void *data, size_t length)
{
const auto nbytes = SocketMonitor::Write((const char *)data, length);
if (gcc_unlikely(nbytes < 0)) {
const auto code = GetSocketError();
if (IsSocketErrorAgain(code))
return 0;
Cancel();
if (IsSocketErrorClosed(code))
OnSocketClosed();
else
OnSocketError(NewSocketError(code));
}
return nbytes;
}
bool
FullyBufferedSocket::WriteFromBuffer()
{
assert(IsDefined());
size_t length;
const void *data = output.Read(&length);
if (data == nullptr) {
CancelWrite();
return true;
}
auto nbytes = DirectWrite(data, length);
if (gcc_unlikely(nbytes <= 0))
return nbytes == 0;
output.Consume(nbytes);
if (output.IsEmpty())
CancelWrite();
return true;
}
bool
FullyBufferedSocket::Write(const void *data, size_t length)
{
assert(IsDefined());
#if 0
/* TODO: disabled because this would add overhead on some callers (the ones that often), but it may be useful */
if (output.IsEmpty()) {
/* try to write it directly first */
const auto nbytes = DirectWrite(data, length);
if (gcc_likely(nbytes > 0)) {
data = (const uint8_t *)data + nbytes;
length -= nbytes;
if (length == 0)
return true;
} else if (nbytes < 0)
return false;
}
#endif
if (!output.Append(data, length)) {
// TODO
OnSocketError(g_error_new_literal(g_quark_from_static_string("buffered_socket"),
0, "Output buffer is full"));
return false;
}
ScheduleWrite();
return true;
}
bool
FullyBufferedSocket::OnSocketReady(unsigned flags)
{
const bool was_empty = output.IsEmpty();
if (!BufferedSocket::OnSocketReady(flags))
return false;
if (was_empty && !output.IsEmpty())
/* just in case the OnSocketInput() method has added
data to the output buffer: try to send it now
instead of waiting for the next event loop
iteration */
flags |= WRITE;
if (flags & WRITE) {
assert(!output.IsEmpty());
if (!WriteFromBuffer())
return false;
}
return true;
}
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