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/*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* AdvancedTCPConnector.cpp
* Copyright (C) 2012 Simon Newton
*/
#include <ola/Callback.h>
#include <ola/Logging.h>
#include <ola/io/SelectServerInterface.h>
#include <ola/network/AdvancedTCPConnector.h>
#include <ola/network/TCPConnector.h>
namespace ola {
namespace network {
using std::pair;
AdvancedTCPConnector::AdvancedTCPConnector(
ola::io::SelectServerInterface *ss,
TCPSocketFactoryInterface *socket_factory,
const ola::TimeInterval &connection_timeout)
: m_socket_factory(socket_factory),
m_ss(ss),
m_connector(ss),
m_connection_timeout(connection_timeout) {
}
AdvancedTCPConnector::~AdvancedTCPConnector() {
ConnectionMap::iterator iter = m_connections.begin();
for (; iter != m_connections.end(); ++iter) {
AbortConnection(iter->second);
delete iter->second;
}
m_connections.clear();
}
void AdvancedTCPConnector::AddEndpoint(const IPV4SocketAddress &endpoint,
BackOffPolicy *backoff_policy,
bool paused) {
IPPortPair key(endpoint.Host(), endpoint.Port());
ConnectionMap::iterator iter = m_connections.find(key);
if (iter != m_connections.end())
return;
// new ip:port
ConnectionInfo *state = new ConnectionInfo;
state->state = paused ? PAUSED : DISCONNECTED;
state->failed_attempts = 0;
state->retry_timeout = ola::thread::INVALID_TIMEOUT;
state->connection_id = 0;
state->policy = backoff_policy;
state->reconnect = true;
m_connections[key] = state;
if (!paused)
AttemptConnection(key, state);
}
void AdvancedTCPConnector::RemoveEndpoint(const IPV4SocketAddress &endpoint) {
IPPortPair key(endpoint.Host(), endpoint.Port());
ConnectionMap::iterator iter = m_connections.find(key);
if (iter == m_connections.end())
return;
AbortConnection(iter->second);
delete iter->second;
m_connections.erase(iter);
}
bool AdvancedTCPConnector::GetEndpointState(
const IPV4SocketAddress &endpoint,
ConnectionState *connected,
unsigned int *failed_attempts) const {
IPPortPair key(endpoint.Host(), endpoint.Port());
ConnectionMap::const_iterator iter = m_connections.find(key);
if (iter == m_connections.end())
return false;
*connected = iter->second->state;
*failed_attempts = iter->second->failed_attempts;
return true;
}
void AdvancedTCPConnector::Disconnect(const IPV4SocketAddress &endpoint,
bool pause) {
IPPortPair key(endpoint.Host(), endpoint.Port());
ConnectionMap::iterator iter = m_connections.find(key);
if (iter == m_connections.end())
return;
if (iter->second->state != CONNECTED)
return;
iter->second->failed_attempts = 0;
if (pause) {
iter->second->state = PAUSED;
} else {
// schedule a retry as if this endpoint failed once
iter->second->state = DISCONNECTED;
iter->second->retry_timeout = m_ss->RegisterSingleTimeout(
iter->second->policy->BackOffTime(1),
ola::NewSingleCallback(
this,
&AdvancedTCPConnector::RetryTimeout,
iter->first));
}
}
void AdvancedTCPConnector::Resume(const IPV4SocketAddress &endpoint) {
IPPortPair key(endpoint.Host(), endpoint.Port());
ConnectionMap::iterator iter = m_connections.find(key);
if (iter == m_connections.end())
return;
if (iter->second->state == PAUSED) {
iter->second->state = DISCONNECTED;
AttemptConnection(iter->first, iter->second);
}
}
/**
* Schedule the re-try attempt for this connection
*/
void AdvancedTCPConnector::ScheduleRetry(const IPPortPair &key,
ConnectionInfo *info) {
info->retry_timeout = m_ss->RegisterSingleTimeout(
info->policy->BackOffTime(info->failed_attempts),
ola::NewSingleCallback(
this,
&AdvancedTCPConnector::RetryTimeout,
key));
}
/**
* Called when it's time to retry
*/
void AdvancedTCPConnector::RetryTimeout(IPPortPair key) {
ConnectionMap::iterator iter = m_connections.find(key);
if (iter == m_connections.end()) {
OLA_FATAL << "Re-connect timer expired but unable to find state entry for "
<< key.first << ":" << key.second;
return;
}
iter->second->retry_timeout = ola::thread::INVALID_TIMEOUT;
AttemptConnection(key, iter->second);
}
/**
* Called by the TCPConnector when a connection is ready or it times out.
*/
void AdvancedTCPConnector::ConnectionResult(IPPortPair key, int fd, int) {
if (fd != -1) {
OLA_INFO << "TCP Connection established to " << key.first << ":" <<
key.second;
}
ConnectionMap::iterator iter = m_connections.find(key);
if (iter == m_connections.end()) {
OLA_FATAL << "Unable to find state for " << key.first << ":" <<
key.second << ", leaking sockets";
return;
}
ConnectionInfo *info = iter->second;
info->connection_id = 0;
if (fd != -1) {
// ok
info->state = CONNECTED;
m_socket_factory->NewTCPSocket(fd);
} else {
// error
info->failed_attempts++;
if (info->reconnect) {
ScheduleRetry(key, info);
}
}
}
/**
* Initiate a connection to this ip:port pair
*/
void AdvancedTCPConnector::AttemptConnection(const IPPortPair &key,
ConnectionInfo *state) {
state->connection_id = m_connector.Connect(
IPV4SocketAddress(key.first, key.second),
m_connection_timeout,
ola::NewSingleCallback(this,
&AdvancedTCPConnector::ConnectionResult,
key));
}
/**
* Abort and clean up a pending connection
* @param state the ConnectionInfo to cleanup.
*/
void AdvancedTCPConnector::AbortConnection(ConnectionInfo *state) {
if (state->connection_id) {
state->reconnect = false;
if (!m_connector.Cancel(state->connection_id))
OLA_WARN << "Failed to cancel connection " << state->connection_id;
}
if (state->retry_timeout != ola::thread::INVALID_TIMEOUT)
m_ss->RemoveTimeout(state->retry_timeout);
}
} // namespace network
} // namespace ola
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