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Add a simple GKeyFile-based store for the memory backend
It needs some testing, but the simple test application works fine.
This commit is contained in:
Vincent Untz
parent
5c6c22bc55
commit
6eb4e56b36
@ -1,3 +1,11 @@
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include "giomodule.h"
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#include "gfile.h"
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#include "gfilemonitor.h"
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#include "gmemorysettingsbackend.h"
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G_DEFINE_TYPE_WITH_CODE (GMemorySettingsBackend,
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@ -8,7 +16,11 @@ G_DEFINE_TYPE_WITH_CODE (GMemorySettingsBackend,
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struct _GMemorySettingsBackendPrivate
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{
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GHashTable *table;
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GHashTable *table;
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gchar *keyfile_path;
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gchar *keyfile_checksum;
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GKeyFile *keyfile;
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GFileMonitor *monitor;
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};
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static GVariant *
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@ -35,22 +47,67 @@ g_memory_settings_backend_write_one (gpointer key,
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{
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GMemorySettingsBackend *memory = ((gpointer *) data)[0];
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const gchar *prefix = ((gpointer *) data)[1];
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gchar *path;
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gchar *slash;
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gchar *base_key;
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g_hash_table_insert (memory->priv->table,
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g_strjoin ("", prefix, key, NULL),
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g_variant_ref (value));
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g_hash_table_replace (memory->priv->table,
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g_strjoin ("", prefix, key, NULL),
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g_variant_ref (value));
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path = g_strjoin ("", prefix, key, NULL);
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slash = strrchr (path, '/');
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base_key = g_strdup (slash + 1);
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slash[1] = '\0';
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g_key_file_set_string (memory->priv->keyfile,
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path, base_key, g_variant_print (value, FALSE));
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g_free (path);
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g_free (base_key);
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return FALSE;
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}
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static void
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g_memory_settings_backend_keyfile_write (GMemorySettingsBackend *memory)
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{
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gchar *dirname;
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gchar *contents;
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gsize length;
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GFile *file;
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dirname = g_path_get_dirname (memory->priv->keyfile_path);
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if (!g_file_test (dirname, G_FILE_TEST_IS_DIR))
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g_mkdir_with_parents (dirname, 0700);
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g_free (dirname);
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contents = g_key_file_to_data (memory->priv->keyfile, &length, NULL);
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file = g_file_new_for_path (memory->priv->keyfile_path);
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g_file_replace_contents (file, contents, length,
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NULL, FALSE, G_FILE_CREATE_REPLACE_DESTINATION,
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NULL, NULL, NULL);
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g_object_unref (file);
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g_free (memory->priv->keyfile_checksum);
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memory->priv->keyfile_checksum = g_compute_checksum_for_string (G_CHECKSUM_SHA256, contents, length);
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g_free (contents);
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}
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static void
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g_memory_settings_backend_write (GSettingsBackend *backend,
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const gchar *prefix,
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GTree *tree,
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gpointer origin_tag)
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{
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GMemorySettingsBackend *memory = G_MEMORY_SETTINGS_BACKEND (backend);
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gpointer write_info[] = { backend, (gpointer) prefix };
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g_tree_foreach (tree, g_memory_settings_backend_write_one, write_info);
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g_memory_settings_backend_keyfile_write (memory);
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g_settings_backend_changed_tree (backend, prefix, tree, origin_tag);
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}
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@ -61,12 +118,164 @@ g_memory_settings_backend_get_writable (GSettingsBackend *backend,
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return TRUE;
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}
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static void
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g_memory_settings_backend_keyfile_reload (GMemorySettingsBackend *memory)
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{
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gchar *contents = NULL;
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gsize length = 0;
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gchar *new_checksum;
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GHashTable *loaded_keys;
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GPtrArray *changed_array;
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gchar **groups = NULL;
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gsize groups_nb = 0;
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int i;
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GList *keys_l = NULL;
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GList *l;
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if (!g_file_get_contents (memory->priv->keyfile_path,
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&contents, &length, NULL))
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{
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contents = g_strdup ("");
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length = 0;
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}
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new_checksum = g_compute_checksum_for_string (G_CHECKSUM_SHA256, contents, length);
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if (g_strcmp0 (memory->priv->keyfile_checksum, new_checksum) == 0) {
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g_free (new_checksum);
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return;
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}
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if (memory->priv->keyfile_checksum != NULL)
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g_free (memory->priv->keyfile_checksum);
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memory->priv->keyfile_checksum = new_checksum;
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if (memory->priv->keyfile != NULL)
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g_key_file_free (memory->priv->keyfile);
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memory->priv->keyfile = g_key_file_new ();
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/* we just silently ignore errors: there's not much we can do about them */
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if (length > 0)
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g_key_file_load_from_data (memory->priv->keyfile, contents, length,
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G_KEY_FILE_KEEP_COMMENTS|G_KEY_FILE_KEEP_TRANSLATIONS, NULL);
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loaded_keys = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
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changed_array = g_ptr_array_new_with_free_func (g_free);
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/* Load keys from the keyfile */
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groups = g_key_file_get_groups (memory->priv->keyfile, &groups_nb);
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for (i = 0; i < groups_nb; i++)
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{
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gchar **keys = NULL;
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gsize keys_nb = 0;
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int j;
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keys = g_key_file_get_keys (memory->priv->keyfile, groups[i], &keys_nb, NULL);
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if (keys == NULL)
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continue;
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for (j = 0; j < keys_nb; j++)
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{
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gchar *value;
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gchar *full_key;
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GVariant *old_variant;
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GVariant *variant;
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value = g_key_file_get_string (memory->priv->keyfile, groups[i], keys[j], NULL);
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if (value == NULL)
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continue;
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variant = g_variant_new_parsed (value);
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g_free (value);
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if (variant == NULL)
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continue;
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full_key = g_strjoin ("", groups[i], keys[j], NULL),
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g_hash_table_insert (loaded_keys, full_key, GINT_TO_POINTER(TRUE));
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old_variant = g_hash_table_lookup (memory->priv->table, full_key);
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if (old_variant == NULL || !g_variant_equal (old_variant, variant))
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{
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g_ptr_array_add (changed_array, g_strdup (full_key));
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g_hash_table_replace (memory->priv->table,
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g_strdup (full_key),
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g_variant_ref_sink (variant));
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}
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else
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g_variant_unref (variant);
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}
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g_strfreev (keys);
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}
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g_strfreev (groups);
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/* Remove keys that were in the hashtable but not in the keyfile */
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keys_l = g_hash_table_get_keys (memory->priv->table);
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for (l = keys_l; l != NULL; l = l->next)
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{
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gchar *key = l->data;
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if (g_hash_table_lookup_extended (loaded_keys, key, NULL, NULL))
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continue;
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g_ptr_array_add (changed_array, g_strdup (key));
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g_hash_table_remove (memory->priv->table, key);
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}
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g_list_free (keys_l);
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if (changed_array->len > 0)
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{
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/* the array has to be NULL-terminated */
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g_ptr_array_add (changed_array, NULL);
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g_settings_backend_changed (G_SETTINGS_BACKEND (memory),
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NULL,
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(const gchar **) changed_array->pdata,
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changed_array->len - 1,
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NULL);
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}
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g_hash_table_unref (loaded_keys);
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g_ptr_array_free (changed_array, TRUE);
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}
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static void
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g_memory_settings_backend_keyfile_changed (GFileMonitor *monitor,
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GFile *file,
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GFile *other_file,
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GFileMonitorEvent event_type,
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gpointer user_data)
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{
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GMemorySettingsBackend *memory;
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if (event_type != G_FILE_MONITOR_EVENT_CHANGED &&
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event_type != G_FILE_MONITOR_EVENT_CREATED &&
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event_type != G_FILE_MONITOR_EVENT_DELETED)
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return;
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memory = G_MEMORY_SETTINGS_BACKEND (user_data);
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g_memory_settings_backend_keyfile_reload (memory);
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}
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static void
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g_memory_settings_backend_finalize (GObject *object)
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{
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GMemorySettingsBackend *memory = G_MEMORY_SETTINGS_BACKEND (object);
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g_hash_table_unref (memory->priv->table);
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memory->priv->table = NULL;
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g_free (memory->priv->keyfile_path);
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memory->priv->keyfile_path = NULL;
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g_key_file_free (memory->priv->keyfile);
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memory->priv->keyfile = NULL;
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g_file_monitor_cancel (memory->priv->monitor);
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g_object_unref (memory->priv->monitor);
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memory->priv->monitor = NULL;
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G_OBJECT_CLASS (g_memory_settings_backend_parent_class)
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->finalize (object);
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@ -75,12 +284,33 @@ g_memory_settings_backend_finalize (GObject *object)
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static void
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g_memory_settings_backend_init (GMemorySettingsBackend *memory)
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{
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const gchar *store_path;
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GFile *file;
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memory->priv = G_TYPE_INSTANCE_GET_PRIVATE (memory,
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G_TYPE_MEMORY_SETTINGS_BACKEND,
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GMemorySettingsBackendPrivate);
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memory->priv->table =
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g_hash_table_new_full (g_str_hash, g_str_equal, g_free,
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(GDestroyNotify) g_variant_unref);
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store_path = g_getenv ("GSETTINGS_MEMORY_BACKEND_STORE");
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if (store_path != NULL && store_path[0] != '\0')
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memory->priv->keyfile_path = g_strdup (store_path);
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else
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memory->priv->keyfile_path = g_build_filename (g_get_user_config_dir (),
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"gsettings", "store", NULL);
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memory->priv->keyfile_checksum = NULL;
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memory->priv->keyfile = NULL;
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file = g_file_new_for_path (memory->priv->keyfile_path);
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memory->priv->monitor = g_file_monitor_file (file, G_FILE_MONITOR_NONE, NULL, NULL);
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g_signal_connect (memory->priv->monitor, "changed",
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(GCallback)g_memory_settings_backend_keyfile_changed, memory);
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g_object_unref (file);
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g_memory_settings_backend_keyfile_reload (memory);
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}
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static void
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