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/*
* Copyright 2003-2017 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 "net/SocketError.hxx"
#include "util/Compiler.h"
#include <assert.h>
#include <string.h>
FullyBufferedSocket::ssize_t
FullyBufferedSocket::DirectWrite(const void *data, size_t length) noexcept
{
const auto nbytes = GetSocket().Write((const char *)data, length);
if (gcc_unlikely(nbytes < 0)) {
const auto code = GetSocketError();
if (IsSocketErrorAgain(code))
return 0;
IdleMonitor::Cancel();
BufferedSocket::Cancel();
if (IsSocketErrorClosed(code))
OnSocketClosed();
else
OnSocketError(std::make_exception_ptr(MakeSocketError(code, "Failed to send to socket")));
}
return nbytes;
}
bool
FullyBufferedSocket::Flush() noexcept
{
assert(IsDefined());
const auto data = output.Read();
if (data.empty()) {
IdleMonitor::Cancel();
CancelWrite();
return true;
}
auto nbytes = DirectWrite(data.data, data.size);
if (gcc_unlikely(nbytes <= 0))
return nbytes == 0;
output.Consume(nbytes);
if (output.empty()) {
IdleMonitor::Cancel();
CancelWrite();
}
return true;
}
bool
FullyBufferedSocket::Write(const void *data, size_t length) noexcept
{
assert(IsDefined());
if (length == 0)
return true;
const bool was_empty = output.empty();
if (!output.Append(data, length)) {
OnSocketError(std::make_exception_ptr(std::runtime_error("Output buffer is full")));
return false;
}
if (was_empty)
IdleMonitor::Schedule();
return true;
}
bool
FullyBufferedSocket::OnSocketReady(unsigned flags) noexcept
{
if (flags & WRITE) {
assert(!output.empty());
assert(!IdleMonitor::IsActive());
if (!Flush())
return false;
}
if (!BufferedSocket::OnSocketReady(flags))
return false;
return true;
}
void
FullyBufferedSocket::OnIdle() noexcept
{
if (Flush() && !output.empty())
ScheduleWrite();
}
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