icinga2/lib/base/stream.cpp

138 lines
3.6 KiB
C++

/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012-2015 Icinga Development Team (http://www.icinga.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 St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
#include "base/stream.hpp"
#include <boost/algorithm/string/trim.hpp>
using namespace icinga;
void Stream::RegisterDataHandler(const boost::function<void(void)>& handler)
{
if (SupportsWaiting())
OnDataAvailable.connect(handler);
else
BOOST_THROW_EXCEPTION(std::runtime_error("Stream does not support waiting."));
}
bool Stream::SupportsWaiting(void) const
{
return false;
}
bool Stream::IsDataAvailable(void) const
{
return false;
}
void Stream::SignalDataAvailable(void)
{
OnDataAvailable();
{
boost::mutex::scoped_lock lock(m_Mutex);
m_CV.notify_all();
}
}
void Stream::WaitForData(void)
{
if (!SupportsWaiting())
BOOST_THROW_EXCEPTION(std::runtime_error("Stream does not support waiting."));
boost::mutex::scoped_lock lock(m_Mutex);
while (!IsDataAvailable())
m_CV.wait(lock);
}
StreamReadStatus Stream::ReadLine(String *line, StreamReadContext& context, bool may_wait)
{
if (context.Eof)
return StatusEof;
if (context.MustRead) {
if (!context.FillFromStream(this, may_wait)) {
context.Eof = true;
*line = String(context.Buffer, &(context.Buffer[context.Size]));
boost::algorithm::trim_right(*line);
return StatusNewItem;
}
}
int count = 0;
size_t first_newline;
for (size_t i = 0; i < context.Size; i++) {
if (context.Buffer[i] == '\n') {
count++;
if (count == 1)
first_newline = i;
else if (count > 1)
break;
}
}
context.MustRead = (count <= 1);
if (count > 0) {
*line = String(context.Buffer, &(context.Buffer[first_newline]));
boost::algorithm::trim_right(*line);
context.DropData(first_newline + 1);
return StatusNewItem;
}
return StatusNeedData;
}
bool StreamReadContext::FillFromStream(const Stream::Ptr& stream, bool may_wait)
{
if (may_wait && stream->SupportsWaiting())
stream->WaitForData();
size_t count = 0;
do {
Buffer = (char *)realloc(Buffer, Size + 4096);
if (!Buffer)
throw std::bad_alloc();
size_t rc = stream->Read(Buffer + Size, 4096, true);
Size += rc;
count += rc;
} while (count < 64 * 1024 && stream->IsDataAvailable());
if (count == 0 && stream->IsEof())
return false;
else
return true;
}
void StreamReadContext::DropData(size_t count)
{
memmove(Buffer, Buffer + count, Size - count);
Size -= count;
}