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// Copyright (C) 2017-2024 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#ifndef HTTP_CONNECTION_POOL_H
#define HTTP_CONNECTION_POOL_H
#include <http/connection.h>
#include <list>
#include <mutex>
namespace isc {
namespace http {
/// @brief Pool of active HTTP connections.
///
/// The HTTP server is designed to handle many connections simultaneously.
/// The communication between the client and the server may take long time
/// and the server must be able to react on other events while the communication
/// with the clients is in progress. Thus, the server must track active
/// connections and gracefully close them when needed. An obvious case when the
/// connections must be terminated by the server is when the shutdown signal
/// is received.
///
/// This object is a simple container for the server connections which provides
/// means to terminate them on request.
class HttpConnectionPool {
public:
/// @brief Start new connection.
///
/// The connection is inserted to the pool and the
/// @ref HttpConnection::asyncAccept is invoked.
///
/// @param connection Pointer to the new connection.
void start(const HttpConnectionPtr& connection);
/// @brief Removes a connection from the pool and shutdown it.
///
/// Shutdown is specific to TLS and is a first part of graceful close (note it is
/// NOT the same as TCP shutdown system call).
///
/// @note if the TLS connection stalls e.g. the peer does not try I/O
/// on it the connection has to be explicitly stopped.
///
/// @param connection Pointer to the connection.
void shutdown(const HttpConnectionPtr& connection);
/// @brief Removes a connection from the pool and stops it.
///
/// @param connection Pointer to the connection.
void stop(const HttpConnectionPtr& connection);
/// @brief Stops all connections and removes them from the pool.
void stopAll();
protected:
/// @brief Stops all connections and removes them from the pool.
///
/// Must be called from with a thread-safe context.
void stopAllInternal();
/// @brief Set of connections.
std::list<HttpConnectionPtr> connections_;
/// @brief Mutex to protect the internal state.
std::mutex mutex_;
};
}
}
#endif
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