subscriptionstore.h
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#ifndef SUBSCRIPTIONSTORE_H
#define SUBSCRIPTIONSTORE_H
#include <unordered_map>
#include <forward_list>
#include <list>
#include <mutex>
#include <pthread.h>
#include "forward_declarations.h"
#include "client.h"
#include "session.h"
#include "utils.h"
#include "retainedmessage.h"
#include "logger.h"
struct RetainedPayload
{
std::string payload;
char qos;
};
struct Subscription
{
std::weak_ptr<Session> session; // Weak pointer expires when session has been cleaned by 'clean session' connect or when it was remove because it expired
char qos;
bool operator==(const Subscription &rhs) const;
void reset();
bool sessionGone() const;
};
class SubscriptionNode
{
std::string subtopic;
std::vector<Subscription> subscribers;
public:
SubscriptionNode(const std::string &subtopic);
SubscriptionNode(const SubscriptionNode &node) = delete;
SubscriptionNode(SubscriptionNode &&node) = delete;
std::vector<Subscription> &getSubscribers();
void addSubscriber(const std::shared_ptr<Session> &subscriber, char qos);
void removeSubscriber(const std::shared_ptr<Session> &subscriber);
std::unordered_map<std::string, std::unique_ptr<SubscriptionNode>> children;
std::unique_ptr<SubscriptionNode> childrenPlus;
std::unique_ptr<SubscriptionNode> childrenPound;
int cleanSubscriptions();
};
class SubscriptionStore
{
std::unique_ptr<SubscriptionNode> root;
pthread_rwlock_t subscriptionsRwlock = PTHREAD_RWLOCK_INITIALIZER;
std::unordered_map<std::string, std::shared_ptr<Session>> sessionsById;
const std::unordered_map<std::string, std::shared_ptr<Session>> &sessionsByIdConst;
pthread_rwlock_t retainedMessagesRwlock = PTHREAD_RWLOCK_INITIALIZER;
std::unordered_set<RetainedMessage> retainedMessages;
Logger *logger = Logger::getInstance();
void publishNonRecursively(const MqttPacket &packet, const std::vector<Subscription> &subscribers) const;
void publishRecursively(std::vector<std::string>::const_iterator cur_subtopic_it, std::vector<std::string>::const_iterator end,
std::unique_ptr<SubscriptionNode> &next, const MqttPacket &packet) const;
public:
SubscriptionStore();
void addSubscription(Client_p &client, const std::string &topic, char qos);
void removeSubscription(Client_p &client, const std::string &topic);
void registerClientAndKickExistingOne(Client_p &client);
bool sessionPresent(const std::string &clientid);
void queuePacketAtSubscribers(const std::string &topic, const MqttPacket &packet);
void giveClientRetainedMessages(const std::shared_ptr<Session> &ses, const std::string &subscribe_topic, char max_qos);
void setRetainedMessage(const std::string &topic, const std::string &payload, char qos);
void removeExpiredSessionsClients();
};
#endif // SUBSCRIPTIONSTORE_H