pidgin/pidgin

GSoC History API including sqlite history adapter

2021-10-12, James Culver
741992355ead
GSoC History API including sqlite history adapter

The History API has been created to drive all message handling in purple3. It will be used to update existing messages for edits, reactions, pinning, read/deliver receipts, etc. The API uses an adapter pattern, to abstract out backends, but provides a SQLite3 backend by default.

It also provides search capabilities using a custom query language that can easily be expanded over time. It will be use by both the end user to search messages and the frontends to implement features like a pinned messages button. A command line utility is also provided for searching outside of the program itself.

## Remaining Items

**These all will most likely be done by the Pidgin core team after GSoC when we figure out exactly how to solve them.**

Need to store database in purple config directory
* Gary has spent some time looking at this and it looks like the purple-history cli will need to become a purple-ui to make this work write as in the future other adapters will be plugins.

Other things to consider:
- For simplicity, the SqliteHistoryAdapter is parsing the query itself, but for consistency having `PurpleHistoryAdapter` parse the query and pass tokens to the subclass might be something we want to do.

Testing Done:
## Unit Tests
History Manager
History Adapter

## Integration Tests
purplehistorycore created for integration tests.
PurpleSqliteHistoryAdapter functionality tested:
- Creates proper db schema
- Writes logs
- Reads logs
- Queries using query language
- Deletes using query language

Bugs closed: PIDGIN-17526, PIDGIN-17532, PIDGIN-17533, PIDGIN-17534

Reviewed at https://reviews.imfreedom.org/r/877/
/*
* Purple - Internet Messaging Library
* Copyright (C) Pidgin Developers <devel@pidgin.im>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses/>.
*/
#if !defined(PURPLE_GLOBAL_HEADER_INSIDE) && !defined(PURPLE_COMPILATION)
# error "only <pidgin.h> may be included directly"
#endif
#ifndef PURPLE_HISTORY_MANAGER_H
#define PURPLE_HISTORY_MANAGER_H
#include <glib.h>
#include <glib-object.h>
#include "purplehistoryadapter.h"
G_BEGIN_DECLS
/**
* SECTION:purplehistorymanager
* @section_id: libpurple-purplehistorymanager
* @title: Purple History Manager
*
* #PurpleHistoryManager keeps track of all adapters and emits signals when
* adapters are registered and unregistered.
*/
/**
* PURPLE_HISTORY_MANAGER_DOMAIN:
*
* A #GError domain for errors from #PurpleHistoryManager.
*
* Since: 3.0.0
*/
#define PURPLE_HISTORY_MANAGER_DOMAIN (g_quark_from_static_string("purple-history-manager"))
/**
* PURPLE_TYPE_HISTORY_MANAGER:
*
* The standard _get_type macro for #PurpleHistoryManager.
*/
#define PURPLE_TYPE_HISTORY_MANAGER (purple_history_manager_get_type())
G_DECLARE_DERIVABLE_TYPE(PurpleHistoryManager, purple_history_manager,
PURPLE, HISTORY_MANAGER, GObject)
/**
* PurpleHistoryManager:
*
* An opaque data structure that represents a history manager.
*
* Since: 3.0.0
*/
/**
* PurpleHistoryManagerClass:
* @active_changed: The default signal handler for when an adapter is changed.
* @registered: The default signal handler for when an adapter is registered.
* @unregistered: The default signal handler for when an adapter is unregistered.
*
* The class structure for #PurpleHistoryManager.
*
* Since: 3.0.0
*/
struct _PurpleHistoryManagerClass {
/*< private >*/
GObjectClass parent;
/*< public >*/
void (*active_changed)(PurpleHistoryManager *manager, PurpleHistoryAdapter *previous, PurpleHistoryAdapter *current);
gboolean (*registered)(PurpleHistoryManager *manager, PurpleHistoryAdapter *adapter, GError **error);
gboolean (*unregistered)(PurpleHistoryManager *manager, PurpleHistoryAdapter *adapter, GError **error);
/*< private >*/
gpointer reserved[4];
};
/**
* PurpleHistoryManagerForeachFunc:
* @adapter: The #PurpleHistoryAdapter instance.
* @data: User supplied data.
*
* A function to be used as a callback with
* purple_history_manager_foreach().
*
* Since: 3.0.0
*/
typedef void (*PurpleHistoryManagerForeachFunc)(PurpleHistoryAdapter *adapter, gpointer data);
/**
* purple_history_manager_get_default:
*
* Gets the default #PurpleHistoryManager instance.
*
* Returns: (transfer none): The default #PurpleHistoryManager instance.
*
* Since: 3.0.0
*/
PurpleHistoryManager *purple_history_manager_get_default(void);
/**
* purple_history_manager_get_active:
* @manager: The #PurpleHistoryManager instance.
*
* Gets the active #PurpleHistoryAdapter instance.
*
* Returns: The active @adapter
*
* Since: 3.0.0
*/
PurpleHistoryAdapter *purple_history_manager_get_active(PurpleHistoryManager *manager);
/**
* purple_history_manager_set_active:
* @manager: The #PurpleHistoryManager instance.
* @id: The id of the #PurpleHistoryAdapter to set active.
* @error: A return address for a #GError.
*
* Sets the active #PurpleHistoryAdapter instance.
*
* Returns: %TRUE if setting the @adapter was successful with @manager
* %FALSE otherwise.
*
* Since: 3.0.0
*/
gboolean purple_history_manager_set_active(PurpleHistoryManager *manager, const gchar *id, GError **error);
/**
* purple_history_manager_register:
* @manager: The #PurpleHistoryManager instance.
* @adapter: The #PurpleHistoryAdapter to register.
* @error: A return address for a #GError.
*
* Registers @adapter with @manager.
*
* Returns: %TRUE if @adapter was successfully registered with @manager,
* %FALSE otherwise.
*
* Since: 3.0.0
*/
gboolean purple_history_manager_register(PurpleHistoryManager *manager, PurpleHistoryAdapter *adapter, GError **error);
/**
* purple_history_manager_unregister:
* @manager: The #PurpleHistoryManager instance.
* @adapter: The #PurpleHistoryAdapter to unregister.
* @error: A return address for a #GError.
*
* Unregisters @adapter from @manager.
*
* Returns: %TRUE if @adapter was successfully unregistered from @manager,
* %FALSE otherwise.
*
* Since: 3.0.0
*/
gboolean purple_history_manager_unregister(PurpleHistoryManager *manager, PurpleHistoryAdapter *adapter, GError **error);
/**
* purple_history_manager_find:
* @manager: The #PurpleHistoryManager instance.
* @id: The id of the #PurpleHistoryAdapter to find.
*
* Gets the #PurpleHistoryAdapter identified by @id if found, otherwise %NULL.
*
* Returns: (transfer none): The #PurpleHistoryAdapter identified by @id or %NULL.
*
* Since: 3.0.0
*/
PurpleHistoryAdapter *purple_history_manager_find(PurpleHistoryManager *manager, const gchar *id);
/**
* purple_history_manager_get_all:
* @manager: The #PurpleHistoryManager instance.
*
* Gets a list of all #PurpleHistoryAdapter's that are currently registered in
* @manager.
*
* Returns: (transfer container) (element-type PurpleHistoryAdapter): The list
* containing all of the #PurpleHistoryAdapter's registered with @manager.
*
* Since: 3.0.0
*/
GList *purple_history_manager_get_all(PurpleHistoryManager *manager);
/**
* purple_history_manager_query:
* @manager: The #PurpleHistoryManager instance.
* @query: A query to send to the @manager instance.
* @error: A return address for a #GError.
*
* Sends a query to the #PurpleHistoryAdapter @manager instance.
*
* Returns: (transfer full) (element-type PurpleHistoryAdapter): The list
* containing all of the #PurpleMessage's that matched the query
* with @manager.
*
* Since: 3.0.0
*/
GList *purple_history_manager_query(PurpleHistoryManager *manager, const gchar *query, GError **error);
/**
* purple_history_manager_remove:
* @manager: The #PurpleHistoryManager instance.
* @query: A query to send to the @manager instance.
* @error: A return address for a #GError.
*
* Removes messages from the active #PurpleHistoryAdapter of @manager that match @query.
*
* Returns: %TRUE if messages matching @query were successfully removed from
* the active adapter of @manager, %FALSE otherwise.
*
* Since: 3.0.0
*/
gboolean purple_history_manager_remove(PurpleHistoryManager *manager, const gchar *query, GError **error);
/**
* purple_history_manager_write:
* @manager: The #PurpleHistoryManager instance.
* @conversation: The #PurpleConversation.
* @message: The #PurpleMessage to pass to the @manager.
* @error: A return address for a #GError.
*
* Writes @message to the active adapter of @manager.
*
* Returns: %TRUE if @message was successfully written, %FALSE otherwise.
*
* Since: 3.0.0
*/
gboolean purple_history_manager_write(PurpleHistoryManager *manager, PurpleConversation *conversation, PurpleMessage *message, GError **error);
/**
* purple_history_manager_foreach:
* @manager: The #PurpleHistoryManager instance.
* @func: (scope call): The #PurpleHistoryManagerForeachFunc to call.
* @data: User data to pass to @func.
*
* Calls @func for each #PurpleHistoryAdapter that @manager knows about.
*
* Since: 3.0.0
*/
void purple_history_manager_foreach(PurpleHistoryManager *manager, PurpleHistoryManagerForeachFunc func, gpointer data);
G_END_DECLS
#endif /* PURPLE_HISTORY_MANAGER_H */