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#ifndef SOCKETPROXY_H
#define SOCKETPROXY_H
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*
*/
#include "qpid/sys/Socket.h"
#include "qpid/sys/Poller.h"
#include "qpid/sys/Runnable.h"
#include "qpid/sys/Thread.h"
#include "qpid/sys/Mutex.h"
#include "qpid/client/Connection.h"
#include "qpid/log/Statement.h"
#include <algorithm>
/**
* A simple socket proxy that forwards to another socket.
* Used between client & local broker to simulate network failures.
*/
class SocketProxy : private qpid::sys::Runnable
{
public:
/** Connect to connectPort on host, start a forwarding thread.
* Listen for connection on getPort().
*/
SocketProxy(int connectPort, const std::string host="localhost")
: closed(false), port(listener.listen()), dropClient(), dropServer()
{
client.connect(host, connectPort);
thread = qpid::sys::Thread(static_cast<qpid::sys::Runnable*>(this));
}
~SocketProxy() { close(); }
/** Simulate a network disconnect. */
void close() {
{
qpid::sys::Mutex::ScopedLock l(lock);
if (closed) return;
closed=true;
}
poller.shutdown();
if (thread.id() != qpid::sys::Thread::current().id())
thread.join();
client.close();
}
/** Simulate lost packets, drop data from client */
void dropClientData(bool drop=true) { dropClient=drop; }
/** Simulate lost packets, drop data from server */
void dropServerData(bool drop=true) { dropServer=drop; }
bool isClosed() const {
qpid::sys::Mutex::ScopedLock l(lock);
return closed;
}
uint16_t getPort() const { return port; }
private:
static void throwErrno(const std::string& msg) {
throw qpid::Exception(msg+":"+qpid::sys::strError(errno));
}
static void throwIf(bool condition, const std::string& msg) {
if (condition) throw qpid::Exception(msg);
}
void run() {
std::auto_ptr<qpid::sys::Socket> server;
try {
qpid::sys::PollerHandle listenerHandle(listener);
poller.addFd(listenerHandle, qpid::sys::Poller::INPUT);
qpid::sys::Poller::Event event = poller.wait();
throwIf(event.type == qpid::sys::Poller::SHUTDOWN, "SocketProxy: Closed by close()");
throwIf(!(event.type == qpid::sys::Poller::READABLE && event.handle == &listenerHandle), "SocketProxy: Accept failed");
poller.delFd(listenerHandle);
server.reset(listener.accept());
// Pump data between client & server sockets
qpid::sys::PollerHandle clientHandle(client);
qpid::sys::PollerHandle serverHandle(*server);
poller.addFd(clientHandle, qpid::sys::Poller::INPUT);
poller.addFd(serverHandle, qpid::sys::Poller::INPUT);
char buffer[1024];
for (;;) {
qpid::sys::Poller::Event event = poller.wait();
throwIf(event.type == qpid::sys::Poller::SHUTDOWN, "SocketProxy: Closed by close()");
throwIf(event.type == qpid::sys::Poller::DISCONNECTED, "SocketProxy: client/server disconnected");
if (event.handle == &serverHandle) {
ssize_t n = server->read(buffer, sizeof(buffer));
if (!dropServer) client.write(buffer, n);
poller.rearmFd(serverHandle);
} else if (event.handle == &clientHandle) {
ssize_t n = client.read(buffer, sizeof(buffer));
if (!dropClient) server->write(buffer, n);
poller.rearmFd(clientHandle);
} else {
throwIf(true, "SocketProxy: No handle ready");
}
}
}
catch (const std::exception& e) {
QPID_LOG(debug, "SocketProxy::run exception: " << e.what());
}
try {
if (server.get()) server->close();
close();
}
catch (const std::exception& e) {
QPID_LOG(debug, "SocketProxy::run exception in client/server close()" << e.what());
}
}
mutable qpid::sys::Mutex lock;
bool closed;
qpid::sys::Poller poller;
qpid::sys::Socket client, listener;
uint16_t port;
qpid::sys::Thread thread;
bool dropClient, dropServer;
};
#endif
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