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>
*
* Purple is the legal property of its developers, whose names are too numerous
* to list here. Please refer to the COPYRIGHT file distributed with this
* source distribution.
*
* 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 <http://www.gnu.org/licenses/>.
*/
#if !defined(PURPLE_GLOBAL_HEADER_INSIDE) && !defined(PURPLE_COMPILATION)
# error "only <purple.h> may be included directly"
#endif
#ifndef PURPLE_KEY_VALUE_PAIR_H
#define PURPLE_KEY_VALUE_PAIR_H
/**
* SECTION:purplekeyvaluepair
* @section_id: libpurple-keyvaluepair
* @short_description: <filename>purplekeyvaluepair.h</filename>
* @title: Key Value Pairs
*
* A simple key value pair data structure.
*/
#include <glib.h>
#include <glib-object.h>
#define PURPLE_TYPE_KEY_VALUE_PAIR (purple_key_value_pair_get_type())
/**
* PurpleKeyValuePair:
* @key: The key
* @value: The value
* @value_destroy_func: A #GDestroyNotify to free @value when
* purple_key_value_pair_free() is called.
*
* A key-value pair.
*
* This is used by, among other things, purple_gtk_combo* functions to pass in
* a list of key-value pairs so it can display a user-friendly value.
*/
typedef struct _PurpleKeyValuePair PurpleKeyValuePair;
G_BEGIN_DECLS
struct _PurpleKeyValuePair {
gchar *key;
gpointer value;
GDestroyNotify value_destroy_func;
};
/**
* purple_key_value_pair_get_type:
*
* The standard %_GET_TYPE function for #PurpleKeyValuePair.
*
* Returns: The #GType for #PurpleKeyValuePair.
*/
GType purple_key_value_pair_get_type(void);
/**
* purple_key_value_pair_new:
* @key: The key part of PurpleKeyValuePair
* @value: The value part of PurpleKeyValuePair
*
* Creates a new PurpleKeyValuePair allocating memory for @key,
* free value function is NULL.
*
* Returns: (transfer full): The created PurpleKeyValuePair
*
* Since: 3.0.0
*/
PurpleKeyValuePair *purple_key_value_pair_new(const gchar *key, gpointer value);
/**
* purple_key_value_pair_new_full:
* @key: The key part of PurpleKeyValuePair
* @value: The value part of PurpleKeyValuePair
* @value_destroy_func: a function to free the memory for the @value
*
* Creates a new PurpleKeyValuePair allocating memory for @key,
* set free value function to @value_destroy_func.
*
* Returns: (transfer full): The created PurpleKeyValuePair
*
* Since: 3.0.0
*/
PurpleKeyValuePair *purple_key_value_pair_new_full(const gchar *key, gpointer value, GDestroyNotify value_destroy_func);
/**
* purple_key_value_pair_free:
* @kvp: The PurpleKeyValuePair to free.
*
* Frees @kvp.
*
* Since: 3.0.0
*/
void purple_key_value_pair_free(PurpleKeyValuePair *kvp);
/**
* purple_key_value_pair_copy:
* @kvp: The #PurpleKeyValuePair to copy.
*
* Creates a copy of @kvp.
*
* If @kvp has a value_destroy_func, %NULL will be returned as this function
* has no way to know how to allocate a new copy of the value.
*
* Returns: (transfer full): A new copy of @kvp.
*/
PurpleKeyValuePair *purple_key_value_pair_copy(PurpleKeyValuePair *kvp);
G_END_DECLS
#endif /* PURPLE_KEY_VALUE_PAIR_H */