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#ifndef CERT_TRANS_NET_CONNECTION_POOL_H_
#define CERT_TRANS_NET_CONNECTION_POOL_H_
#include <openssl/ssl.h>
#include <stdint.h>
#include <deque>
#include <map>
#include <memory>
#include <mutex>
#include <string>
#include "base/macros.h"
#include "net/url.h"
#include "util/libevent_wrapper.h"
namespace cert_trans {
// Status code for when something went wrong with the connection.
const int kUnknownErrorStatus = 0;
// Status code for when there was an error with the SSL negotiation.
const int kSSLErrorStatus = 1;
// Status code for when the connection timed-out.
const int kTimeout = 2;
namespace internal {
struct evhtp_connection_deleter {
void operator()(evhtp_connection_t* con) const {
evhtp_connection_free(con);
}
};
typedef std::pair<std::string, uint16_t> HostPortPair;
class EvConnection;
class ConnectionPool {
public:
class Connection {
public:
Connection(const std::shared_ptr<EvConnection>& evc);
evhtp_connection_t* connection() const;
const HostPortPair& other_end() const;
bool GetErrored() const;
private:
std::shared_ptr<EvConnection> connection_;
friend class ConnectionPool;
DISALLOW_COPY_AND_ASSIGN(Connection);
};
ConnectionPool(libevent::Base* base);
std::unique_ptr<Connection> Get(const URL& url);
void Put(std::unique_ptr<Connection> conn);
private:
typedef std::pair<std::chrono::system_clock::time_point,
std::unique_ptr<Connection>> TimestampedConnection;
static void RemoveDeadConnectionsFromDeque(
const std::unique_lock<std::mutex>& lock,
std::deque<TimestampedConnection>* deque);
void Cleanup();
libevent::Base* const base_;
std::mutex lock_;
// We get and put connections from the back of the deque, and when
// there are too many, we prune them from the front (LIFO).
std::map<HostPortPair, std::deque<TimestampedConnection>> conns_;
bool cleanup_scheduled_;
std::unique_ptr<evhtp_ssl_ctx_t, void (*)(evhtp_ssl_ctx_t*)> ssl_ctx_;
DISALLOW_COPY_AND_ASSIGN(ConnectionPool);
};
} // namespace internal
} // namespace cert_trans
#endif // CERT_TRANS_NET_CONNECTION_POOL_H_
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