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/*
* Copyright (c) 2000 - 2014 Samsung Electronics Co., Ltd All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
/*
* @file connection-thread.cpp
* @author Krzysztof Jackiewicz (k.jackiewicz@samsung.com)
* @version 1.0
*/
#include <connection-thread.h>
#include <unistd.h>
#include <poll.h>
#include <dpl/errno_string.h>
#include <dpl/log/log.h>
#include <client-common.h>
namespace CKM {
ConnectionThread::Pipe::Pipe()
{
if (-1 == pipe(m_pipe))
ThrowMsg(PipeError, "Pipe creation failed " << GetErrnoString(errno));
}
ConnectionThread::Pipe::~Pipe()
{
close(m_pipe[0]);
close(m_pipe[1]);
}
void ConnectionThread::Pipe::notify()
{
if (-1 == TEMP_FAILURE_RETRY(write(m_pipe[1], "j", 1)))
ThrowMsg(PipeError, "Writing pipe failed " << GetErrnoString(errno));
}
ConnectionThread::ConnectionThread() :
m_join(false),
m_finished(false)
{
}
ConnectionThread::~ConnectionThread()
{
m_join = true;
m_pipe.notify();
m_thread.join();
}
void ConnectionThread::run()
{
m_thread = std::thread(&ConnectionThread::threadLoop, this);
}
void ConnectionThread::sendMessage(AsyncRequest&& req)
{
std::unique_lock<std::mutex> lock(m_mutex);
m_waitingReqs.push(std::move(req));
lock.unlock();
// notify via pipe
m_pipe.notify();
}
void ConnectionThread::threadLoop()
{
try {
m_descriptors.add(m_pipe.output(),
POLLIN,
[this](int fd, short revents){ newRequest(fd, revents); });
while (!m_join) {
// wait for pipe/socket notification
m_descriptors.wait();
}
} catch (CKM::Exception &e) {
LogError("CKM::Exception::Exception " << e.DumpToString());
} catch (std::exception &e) {
LogError("STD exception " << e.what());
} catch (...) {
LogError("Unknown exception occured");
}
// cleanup services
for (auto& it: m_services)
it.second.serviceError(CKM_API_ERROR_UNKNOWN);
m_services.clear();
// close all descriptors (including pipe)
m_descriptors.purge();
// remove waiting requests and notify about error
std::unique_lock<std::mutex> lock(m_mutex);
while (!m_waitingReqs.empty()) {
m_waitingReqs.front().observer->ReceivedError(CKM_API_ERROR_UNKNOWN);
m_waitingReqs.pop();
}
lock.unlock();
m_finished = true;
}
void ConnectionThread::readPipe(int pipe, short revents)
{
char buffer[1];
if ((revents & POLLIN) == 0)
ThrowMsg(PipeError, "Unexpected event: " << revents << "!=" << POLLIN);
if (1 != TEMP_FAILURE_RETRY(read(pipe, buffer, 1))) {
int err = errno;
ThrowMsg(PipeError, "Failed to read pipe: " << GetErrnoString(err));
}
}
Service& ConnectionThread::getService(const std::string& interface)
{
auto it = m_services.find(interface);
if (it != m_services.end())
return it->second;
// create new service, insert it and return
return m_services.insert(
std::make_pair(interface, Service(m_descriptors, interface))).first->second;
}
void ConnectionThread::newRequest(int pipe, short revents)
{
readPipe(pipe, revents);
std::unique_lock<std::mutex> lock(m_mutex);
// nothing to do?
if (m_waitingReqs.empty()) {
LogWarning("Empty request queue. Are we exiting?");
return;
}
// zero-copy remove
AsyncRequest req = std::move(m_waitingReqs.front());
m_waitingReqs.pop();
lock.unlock();
Service& srv = getService(req.interface);
srv.addRequest(std::move(req));
}
} /* namespace CKM */
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