MQTT C Client Libraries Internals: MQTTPersistence.c File Reference

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MQTTPersistence.c File Reference

Functions that apply to persistence operations. More...

`#include <stdio.h>`
`#include <string.h>`
`#include "MQTTPersistence.h"`
`#include "MQTTPersistenceDefault.h"`
`#include "MQTTProtocolClient.h"`
`#include "Heap.h"`
`#include "StackTrace.h"`
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## Macros
#define | MAX_NO_OF_BUFFERS 9

## Functions
static MQTTPersistence_qEntry * | MQTTPersistence_restoreQueueEntry (char *buffer, size_t buflen, int MQTTVersion)
static void | MQTTPersistence_insertInSeqOrder (List *list, MQTTPersistence_qEntry *qEntry, size_t size)
int | MQTTPersistence_create (MQTTClient_persistence **persistence, int type, void *pcontext)
| Creates a MQTTClient_persistence structure representing a persistence implementation.
int | MQTTPersistence_initialize (Clients *c, const char *serverURI)
| Open persistent store and restore any persisted messages.
int | MQTTPersistence_close (Clients *c)
| Close persistent store.
int | MQTTPersistence_clear (Clients *c)
| Clears the persistent store.
int | MQTTPersistence_restorePackets (Clients *c)
| Restores the persisted records to the outbound and inbound message queues of the client.
void * | MQTTPersistence_restorePacket (int MQTTVersion, char *buffer, size_t buflen)
| Returns a MQTT packet restored from persisted data.
void | MQTTPersistence_insertInOrder (List *list, void *content, size_t size)
| Inserts the specified message into the list, maintaining message ID order.
int | MQTTPersistence_putPacket (SOCKET socket, char *buf0, size_t buf0len, int count, char **buffers, size_t *buflens, int htype, int msgId, int scr, int MQTTVersion)
| Adds a record to the persistent store.
int | MQTTPersistence_remove (Clients *c, char *type, int qos, int msgId)
| Deletes a record from the persistent store.
void | MQTTPersistence_wrapMsgID (Clients *client)
| Checks whether the message IDs wrapped by looking for the largest gap between two consecutive message IDs in the outboundMsgs queue.
int | MQTTPersistence_unpersistQueueEntry (Clients *client, MQTTPersistence_qEntry *qe)
int | MQTTPersistence_persistQueueEntry (Clients *aclient, MQTTPersistence_qEntry *qe)
int | MQTTPersistence_restoreMessageQueue (Clients *c)
| Restores a queue of messages from persistence to memory.

## Detailed Description

Functions that apply to persistence operations.

## Function Documentation

## ◆ MQTTPersistence_clear()

int MQTTPersistence_clear | ( | Clients * | c | ) |

Clears the persistent store.

Parameters

  client | the client as Clients.

Returns
  0 if success, MQTTCLIENT_PERSISTENCE_ERROR otherwise.

## ◆ MQTTPersistence_close()

int MQTTPersistence_close | ( | Clients * | c | ) |

Close persistent store.

Parameters

  client | the client as Clients.

Returns
  0 if success, MQTTCLIENT_PERSISTENCE_ERROR otherwise.

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## ◆ MQTTPersistence_create()

int MQTTPersistence_create | ( | MQTTClient_persistence ** | persistence,
|  | int | type,
|  | void * | pcontext )

Creates a MQTTClient_persistence structure representing a persistence implementation.

Parameters

  persistence | the MQTTClient_persistence structure.
  type | the type of the persistence implementation. See MQTTClient_create.
  pcontext | the context for this persistence implementation. See MQTTClient_create.

Returns
  0 if success, MQTTCLIENT_PERSISTENCE_ERROR otherwise.

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## ◆ MQTTPersistence_initialize()

int MQTTPersistence_initialize | ( | Clients * | c,
|  | const char * | serverURI )

Open persistent store and restore any persisted messages.

Parameters

  client | the client as Clients.
  serverURI | the URI of the remote end.

Returns
  0 if success, MQTTCLIENT_PERSISTENCE_ERROR otherwise.

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## ◆ MQTTPersistence_insertInOrder()

void MQTTPersistence_insertInOrder | ( | List * | list,
|  | void * | content,
|  | size_t | size )

Inserts the specified message into the list, maintaining message ID order.

Parameters

  list | the list to insert the message into.
  content | the message to add.
  size | size of the message.

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## ◆ MQTTPersistence_putPacket()

int MQTTPersistence_putPacket | ( | SOCKET | socket,
|  | char * | buf0,
|  | size_t | buf0len,
|  | int | count,
|  | char ** | buffers,
|  | size_t * | buflens,
|  | int | htype,
|  | int | msgId,
|  | int | scr,
|  | int | MQTTVersion )

Adds a record to the persistent store.

This function must not be called for QoS0 messages.

Parameters

  socket | the socket of the client.
  buf0 | fixed header.
  buf0len | length of the fixed header.
  count | number of buffers representing the variable header and/or the payload.
  buffers | the buffers representing the variable header and/or the payload.
  buflens | length of the buffers representing the variable header and/or the payload.
  htype | MQTT packet type - PUBLISH or PUBREL
  msgId | the message ID.
  scr | 0 indicates message in the sending direction; 1 indicates message in the receiving direction.
  the | MQTT version being used (>= MQTTVERSION_5 means properties included)

Returns
  0 if success, MQTTCLIENT_PERSISTENCE_ERROR otherwise.

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## ◆ MQTTPersistence_remove()

int MQTTPersistence_remove | ( | Clients * | c,
|  | char * | type,
|  | int | qos,
|  | int | msgId )

Deletes a record from the persistent store.

Parameters

  client | the client as Clients.
  type | the type of the persisted record: #PERSISTENCE_PUBLISH_SENT, #PERSISTENCE_PUBREL or #PERSISTENCE_PUBLISH_RECEIVED.
  qos | the qos field of the message.
  msgId | the message ID.

Returns
  0 if success, MQTTCLIENT_PERSISTENCE_ERROR otherwise.

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## ◆ MQTTPersistence_restoreMessageQueue()

int MQTTPersistence_restoreMessageQueue | ( | Clients * | c | ) |

Restores a queue of messages from persistence to memory.

Parameters

  c | the client as Clients - the client object to restore the messages to

Returns
  return code, 0 if successful

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## ◆ MQTTPersistence_restorePacket()

void * MQTTPersistence_restorePacket | ( | int | MQTTVersion,
|  | char * | buffer,
|  | size_t | buflen )

Returns a MQTT packet restored from persisted data.

Parameters

  buffer | the persisted data.
  buflen | the number of bytes of the data buffer.

## ◆ MQTTPersistence_restorePackets()

int MQTTPersistence_restorePackets | ( | Clients * | c | ) |

Restores the persisted records to the outbound and inbound message queues of the client.

Parameters

  client | the client as Clients.

Returns
  0 if success, MQTTCLIENT_PERSISTENCE_ERROR otherwise.

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## ◆ MQTTPersistence_wrapMsgID()

void MQTTPersistence_wrapMsgID | ( | Clients * | client | ) |

Checks whether the message IDs wrapped by looking for the largest gap between two consecutive message IDs in the outboundMsgs queue.

Parameters

  client | the client as Clients.

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