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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 "BufferedSocket.hxx"
#include "net/SocketError.hxx"
#include "Compiler.h"
#include <algorithm>
BufferedSocket::ssize_t
BufferedSocket::DirectRead(void *data, size_t length)
{
const auto nbytes = SocketMonitor::Read((char *)data, length);
if (gcc_likely(nbytes > 0))
return nbytes;
if (nbytes == 0) {
OnSocketClosed();
return -1;
}
const auto code = GetSocketError();
if (IsSocketErrorAgain(code))
return 0;
if (IsSocketErrorClosed(code))
OnSocketClosed();
else
OnSocketError(std::make_exception_ptr(MakeSocketError(code, "Failed to receive from socket")));
return -1;
}
bool
BufferedSocket::ReadToBuffer()
{
assert(IsDefined());
const auto buffer = input.Write();
assert(!buffer.IsEmpty());
const auto nbytes = DirectRead(buffer.data, buffer.size);
if (nbytes > 0)
input.Append(nbytes);
return nbytes >= 0;
}
bool
BufferedSocket::ResumeInput()
{
assert(IsDefined());
while (true) {
const auto buffer = input.Read();
if (buffer.IsEmpty()) {
ScheduleRead();
return true;
}
const auto result = OnSocketInput(buffer.data, buffer.size);
switch (result) {
case InputResult::MORE:
if (input.IsFull()) {
OnSocketError(std::make_exception_ptr(std::runtime_error("Input buffer is full")));
return false;
}
ScheduleRead();
return true;
case InputResult::PAUSE:
CancelRead();
return true;
case InputResult::AGAIN:
continue;
case InputResult::CLOSED:
return false;
}
}
}
bool
BufferedSocket::OnSocketReady(unsigned flags)
{
assert(IsDefined());
if (gcc_unlikely(flags & (ERROR|HANGUP))) {
OnSocketClosed();
return false;
}
if (flags & READ) {
assert(!input.IsFull());
if (!ReadToBuffer())
return false;
if (!ResumeInput())
/* we must return "true" here or
SocketMonitor::Dispatch() will call
Cancel() on a freed object */
return true;
if (!input.IsFull())
ScheduleRead();
}
return true;
}
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