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![A. Walton](/assets/img/avatar_default.png)
2008-04-30 A. Walton <awalton@gnome.org> * libnautilus-private/nautilus-clipboard.c: * libnautilus-private/nautilus-directory-async.c: * libnautilus-private/nautilus-directory.c: * libnautilus-private/nautilus-entry.c: * libnautilus-private/nautilus-file.c: * libnautilus-private/nautilus-horizontal-splitter.c: * libnautilus-private/nautilus-icon-canvas-item.c: * libnautilus-private/nautilus-icon-container.c: * libnautilus-private/nautilus-metafile.c: * libnautilus-private/nautilus-users-groups-cache.c: * libnautilus-private/nautilus-vfs-directory.c: * src/nautilus-emblem-sidebar.c: * src/nautilus-file-management-properties.c: * src/nautilus-window-manage-views.c: * src/nautilus-window.c: * src/nautilus-zoom-control.c: Replace g_return_*() with g_assert() in private, internal functions. Closes #530321. svn path=/trunk/; revision=14114
278 lines
6.2 KiB
C
278 lines
6.2 KiB
C
/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*-
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nautilus-users-groups-cache.c: cache of users' and groups' names.
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Copyright (C) 2006 Zbigniew Chyla
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public
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License along with this program; if not, write to the
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Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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Author: Zbigniew Chyla <mail@zbigniew.chyla.pl>
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*/
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#include <config.h>
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#include "nautilus-users-groups-cache.h"
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#include <glib.h>
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#include <grp.h>
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#include <pwd.h>
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typedef struct _ExpiringCache ExpiringCache;
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/* times in milliseconds */
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#define USERS_CACHE_EXPIRE_TIME (60 * 1000)
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#define GROUPS_CACHE_EXPIRE_TIME (60 * 1000)
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/* cache of users' names */
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static ExpiringCache *users_cache = NULL;
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/* cache of groups' names */
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static ExpiringCache *groups_cache = NULL;
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/**
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* Generic implementation of cache with guint keys and values which expire
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* after specified amount of time.
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*/
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typedef gpointer (*ExpiringCacheGetValFunc) (guint key);
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struct _ExpiringCache
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{
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/* Expiration time of cached value */
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time_t expire_time;
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/* Called to obtain a value by a key */
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ExpiringCacheGetValFunc get_value_func;
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/* Called to destroy a value */
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GDestroyNotify value_destroy_func;
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/* Stores cached values */
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GHashTable *cached_values;
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};
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typedef struct _ExpiringCacheEntry ExpiringCacheEntry;
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struct _ExpiringCacheEntry
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{
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ExpiringCache *cache;
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guint key;
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gpointer value;
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};
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static ExpiringCache *
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expiring_cache_new (time_t expire_time, ExpiringCacheGetValFunc get_value_func,
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GDestroyNotify value_destroy_func)
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{
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ExpiringCache *cache;
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g_assert (get_value_func != NULL);
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cache = g_new (ExpiringCache, 1);
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cache->expire_time = expire_time;
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cache->get_value_func = get_value_func;
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cache->value_destroy_func = value_destroy_func;
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cache->cached_values = g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL, NULL);
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return cache;
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}
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static ExpiringCacheEntry *
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expiring_cache_entry_new (ExpiringCache *cache, guint key, gpointer value)
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{
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ExpiringCacheEntry *entry;
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entry = g_slice_new (ExpiringCacheEntry);
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entry->cache = cache;
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entry->key = key;
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entry->value = value;
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return entry;
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}
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static void
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expiring_cache_entry_destroy (ExpiringCacheEntry *entry)
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{
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if (entry->cache->value_destroy_func != NULL) {
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entry->cache->value_destroy_func (entry->value);
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}
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g_slice_free (ExpiringCacheEntry, entry);
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}
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static gboolean
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cb_cache_entry_expired (ExpiringCacheEntry *entry)
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{
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g_hash_table_remove (entry->cache->cached_values, GSIZE_TO_POINTER (entry->key));
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expiring_cache_entry_destroy (entry);
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return FALSE;
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}
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static gpointer
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expiring_cache_get_value (ExpiringCache *cache, guint key)
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{
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ExpiringCacheEntry *entry;
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g_assert (cache != NULL);
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if (!g_hash_table_lookup_extended (cache->cached_values, GSIZE_TO_POINTER (key),
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NULL, (gpointer) &entry)) {
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entry = expiring_cache_entry_new (cache, key, cache->get_value_func (key));
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g_hash_table_insert (cache->cached_values, GSIZE_TO_POINTER (key), entry);
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g_timeout_add (cache->expire_time, (GSourceFunc) cb_cache_entry_expired, entry);
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}
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return entry->value;
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}
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/*
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* Cache of users' names based on ExpiringCache.
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*/
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typedef struct _UserInfo UserInfo;
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struct _UserInfo {
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char *name;
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char *gecos;
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};
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static UserInfo *
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user_info_new (struct passwd *password_info)
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{
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UserInfo *uinfo;
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if (password_info != NULL) {
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uinfo = g_slice_new (UserInfo);
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uinfo->name = g_strdup (password_info->pw_name);
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uinfo->gecos = g_strdup (password_info->pw_gecos);
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} else {
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uinfo = NULL;
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}
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return uinfo;
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}
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static void
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user_info_free (UserInfo *uinfo)
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{
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if (uinfo != NULL) {
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g_free (uinfo->name);
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g_free (uinfo->gecos);
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g_slice_free (UserInfo, uinfo);
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}
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}
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static gpointer
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users_cache_get_value (guint key)
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{
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return user_info_new (getpwuid (key));
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}
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static UserInfo *
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get_cached_user_info(guint uid)
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{
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if (users_cache == NULL) {
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users_cache = expiring_cache_new (USERS_CACHE_EXPIRE_TIME, users_cache_get_value,
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(GDestroyNotify) user_info_free);
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}
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return expiring_cache_get_value (users_cache, uid);
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}
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/**
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* nautilus_users_cache_get_name:
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*
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* Returns name of user with given uid (using cached data if possible) or
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* NULL in case a user with given uid can't be found.
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*
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* Returns: Newly allocated string or NULL.
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*/
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char *
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nautilus_users_cache_get_name (uid_t uid)
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{
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UserInfo *uinfo;
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uinfo = get_cached_user_info (uid);
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if (uinfo != NULL) {
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return g_strdup (uinfo->name);
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} else {
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return NULL;
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}
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}
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/**
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* nautilus_users_cache_get_gecos:
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*
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* Returns gecos of user with given uid (using cached data if possible) or
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* NULL in case a user with given uid can't be found.
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*
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* Returns: Newly allocated string or NULL.
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*/
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char *
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nautilus_users_cache_get_gecos (uid_t uid)
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{
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UserInfo *uinfo;
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uinfo = get_cached_user_info (uid);
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if (uinfo != NULL) {
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return g_strdup (uinfo->gecos);
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} else {
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return NULL;
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}
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}
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/*
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* Cache of groups' names based on ExpiringCache.
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*/
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static gpointer
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groups_cache_get_value (guint key)
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{
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struct group *group_info;
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group_info = getgrgid (GPOINTER_TO_SIZE (key));
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if (group_info != NULL) {
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return g_strdup (group_info->gr_name);
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} else {
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return NULL;
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}
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}
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/**
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* nautilus_groups_cache_get_name:
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*
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* Returns name of group with given gid (using cached data if possible) or
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* NULL in case a group with given gid can't be found.
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*
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* Returns: Newly allocated string or NULL.
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*/
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char *
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nautilus_groups_cache_get_name (gid_t gid)
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{
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if (groups_cache == NULL) {
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groups_cache = expiring_cache_new (GROUPS_CACHE_EXPIRE_TIME, groups_cache_get_value, g_free);
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}
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return g_strdup (expiring_cache_get_value (groups_cache, gid));
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}
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