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/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2011-2018 Phusion Holding B.V.
*
* "Passenger", "Phusion Passenger" and "Union Station" are registered
* trademarks of Phusion Holding B.V.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* THE SOFTWARE.
*/
#ifndef _PASSENGER_APPLICATION_POOL_SOCKET_H_
#define _PASSENGER_APPLICATION_POOL_SOCKET_H_
#include <vector>
#include <oxt/macros.hpp>
#include <boost/thread.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/weak_ptr.hpp>
#include <boost/container/small_vector.hpp>
#include <climits>
#include <cassert>
#include <LoggingKit/LoggingKit.h>
#include <StaticString.h>
#include <MemoryKit/palloc.h>
#include <IOTools/IOUtils.h>
#include <Core/ApplicationPool/Common.h>
namespace Passenger {
namespace ApplicationPool2 {
using namespace std;
using namespace boost;
struct Connection {
int fd;
bool wantKeepAlive: 1;
bool fail: 1;
bool blocking: 1;
Connection()
: fd(-1),
wantKeepAlive(false),
fail(false),
blocking(true)
{ }
void close() {
if (fd != -1) {
int fd2 = fd;
fd = -1;
wantKeepAlive = false;
safelyClose(fd2);
P_LOG_FILE_DESCRIPTOR_CLOSE(fd2);
}
}
};
/**
* Not thread-safe except for the connection pooling methods, so only use
* within the ApplicationPool lock.
*/
class Socket {
private:
boost::mutex connectionPoolLock;
vector<Connection> idleConnections;
OXT_FORCE_INLINE
int connectionPoolLimit() const {
return concurrency;
}
Connection connect() const {
Connection connection;
P_TRACE(3, "Connecting to " << address);
connection.fd = connectToServer(address, __FILE__, __LINE__);
connection.fail = true;
connection.wantKeepAlive = false;
connection.blocking = true;
P_LOG_FILE_DESCRIPTOR_PURPOSE(connection.fd, "App " << pid << " connection");
return connection;
}
public:
// Socket properties. Read-only.
StaticString address;
StaticString protocol;
StaticString description;
pid_t pid;
/**
* Special values:
* 0 = unlimited concurrency
* -1 = unknown
*/
int concurrency;
bool acceptHttpRequests;
// Private. In public section as alignment optimization.
int totalConnections;
int totalIdleConnections;
/** Invariant: sessions >= 0 */
int sessions;
Socket()
: pid(-1),
concurrency(-1),
acceptHttpRequests(0)
{ }
Socket(pid_t _pid, const StaticString &_address, const StaticString &_protocol,
const StaticString &_description, int _concurrency, bool _acceptHttpRequests)
: address(_address),
protocol(_protocol),
description(_description),
pid(_pid),
concurrency(_concurrency),
acceptHttpRequests(_acceptHttpRequests),
totalConnections(0),
totalIdleConnections(0),
sessions(0)
{ }
Socket(const Socket &other)
: idleConnections(other.idleConnections),
address(other.address),
protocol(other.protocol),
description(other.description),
pid(other.pid),
concurrency(other.concurrency),
acceptHttpRequests(other.acceptHttpRequests),
totalConnections(other.totalConnections),
totalIdleConnections(other.totalIdleConnections),
sessions(other.sessions)
{ }
Socket &operator=(const Socket &other) {
totalConnections = other.totalConnections;
totalIdleConnections = other.totalIdleConnections;
idleConnections = other.idleConnections;
address = other.address;
protocol = other.protocol;
description = other.description;
pid = other.pid;
concurrency = other.concurrency;
acceptHttpRequests = other.acceptHttpRequests;
sessions = other.sessions;
return *this;
}
/**
* Connect to this socket or reuse an existing connection.
*
* One MUST call checkinConnection() when one's done using the Connection.
* Failure to do so will result in a resource leak.
*/
Connection checkoutConnection() {
boost::unique_lock<boost::mutex> l(connectionPoolLock);
if (!idleConnections.empty()) {
P_TRACE(3, "Socket " << address << ": checking out connection from connection pool (" <<
idleConnections.size() << " -> " << (idleConnections.size() - 1) <<
" items). Current total number of connections: " << totalConnections);
Connection connection = idleConnections.back();
idleConnections.pop_back();
totalIdleConnections--;
return connection;
} else {
Connection connection = connect();
totalConnections++;
P_TRACE(3, "Socket " << address << ": there are now " <<
totalConnections << " total connections");
l.unlock();
return connection;
}
}
void checkinConnection(Connection &connection) {
boost::unique_lock<boost::mutex> l(connectionPoolLock);
if (connection.fail || !connection.wantKeepAlive || totalIdleConnections >= connectionPoolLimit()) {
totalConnections--;
assert(totalConnections >= 0);
P_TRACE(3, "Socket " << address << ": connection not checked back into "
"connection pool. There are now " << totalConnections <<
" connections in total");
l.unlock();
connection.close();
} else {
P_TRACE(3, "Socket " << address << ": checking in connection into connection pool (" <<
totalIdleConnections << " -> " << (totalIdleConnections + 1) <<
" items). Current total number of connections: " << totalConnections);
totalIdleConnections++;
idleConnections.push_back(connection);
}
}
void closeAllConnections() {
boost::unique_lock<boost::mutex> l(connectionPoolLock);
assert(sessions == 0);
assert(totalConnections == totalIdleConnections);
vector<Connection>::iterator it, end = idleConnections.end();
for (it = idleConnections.begin(); it != end; it++) {
try {
it->close();
} catch (const SystemException &e) {
P_ERROR("Cannot close a connection with socket " << address << ": " << e.what());
}
}
idleConnections.clear();
totalConnections = 0;
totalIdleConnections = 0;
}
bool isIdle() const {
return sessions == 0;
}
int busyness() const {
/* Different sockets within a Process may have different
* 'concurrency' values. We want:
* - the socket with the smallest busyness to be be picked for routing.
* - to give sockets with concurrency == 0 or -1 more priority (in general)
* over sockets with concurrency > 0.
* Therefore, in case of sockets with concurrency > 0, we describe our
* busyness as a percentage of 'concurrency', with the percentage value
* in [0..INT_MAX] instead of [0..1]. That way, the busyness value
* of sockets with concurrency > 0 is usually higher than that of sockets
* with concurrency == 0 or -1.
*/
if (concurrency <= 0) {
return sessions;
} else {
return (int) (((long long) sessions * INT_MAX) / (double) concurrency);
}
}
bool isTotallyBusy() const {
return concurrency > 0 && sessions >= concurrency;
}
void recreateStrings(psg_pool_t *newPool) {
recreateString(newPool, address);
recreateString(newPool, protocol);
recreateString(newPool, description);
}
};
class SocketList: public boost::container::small_vector<Socket, 1> {
public:
void add(pid_t pid, const StaticString &address, const StaticString &protocol,
const StaticString &description, int concurrency, bool acceptHttpRequests)
{
push_back(Socket(pid, address, protocol, description, concurrency,
acceptHttpRequests));
}
const Socket *findFirstSocketWithProtocol(const StaticString &protocol) const {
const_iterator it, end = this->end();
for (it = begin(); it != end; it++) {
if (it->protocol == protocol) {
return &(*it);
}
}
return NULL;
}
};
typedef boost::shared_ptr<SocketList> SocketListPtr;
} // namespace ApplicationPool2
} // namespace Passenger
#endif /* _PASSENGER_APPLICATION_POOL2_SOCKET_H_ */
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