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-rw-r--r--src/db/simple_db_plugin.c287
-rw-r--r--src/db/simple_db_plugin.h42
2 files changed, 329 insertions, 0 deletions
diff --git a/src/db/simple_db_plugin.c b/src/db/simple_db_plugin.c
new file mode 100644
index 000000000..0154cb223
--- /dev/null
+++ b/src/db/simple_db_plugin.c
@@ -0,0 +1,287 @@
+/*
+ * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "simple_db_plugin.h"
+#include "db_internal.h"
+#include "db_save.h"
+#include "conf.h"
+#include "glib_compat.h"
+#include "directory.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+
+struct simple_db {
+ struct db base;
+
+ char *path;
+
+ struct directory *root;
+
+ time_t mtime;
+};
+
+G_GNUC_CONST
+static inline GQuark
+simple_db_quark(void)
+{
+ return g_quark_from_static_string("simple_db");
+}
+
+static struct db *
+simple_db_init(const struct config_param *param, GError **error_r)
+{
+ struct simple_db *db = g_malloc(sizeof(*db));
+ db_base_init(&db->base, &simple_db_plugin);
+
+ GError *error = NULL;
+ db->path = config_dup_block_path(param, "path", error_r);
+ if (db->path == NULL) {
+ g_free(db);
+ if (error != NULL)
+ g_propagate_error(error_r, error);
+ else
+ g_set_error(error_r, simple_db_quark(), 0,
+ "No \"path\" parameter specified");
+ return NULL;
+ }
+
+ return &db->base;
+}
+
+static void
+simple_db_finish(struct db *_db)
+{
+ struct simple_db *db = (struct simple_db *)_db;
+
+ g_free(db->path);
+ g_free(db);
+}
+
+static bool
+simple_db_check(struct simple_db *db, GError **error_r)
+{
+ assert(db != NULL);
+ assert(db->path != NULL);
+
+ /* Check if the file exists */
+ if (access(db->path, F_OK)) {
+ /* If the file doesn't exist, we can't check if we can write
+ * it, so we are going to try to get the directory path, and
+ * see if we can write a file in that */
+ char *dirPath = g_path_get_dirname(db->path);
+
+ /* Check that the parent part of the path is a directory */
+ struct stat st;
+ if (stat(dirPath, &st) < 0) {
+ g_free(dirPath);
+ g_set_error(error_r, simple_db_quark(), errno,
+ "Couldn't stat parent directory of db file "
+ "\"%s\": %s",
+ db->path, g_strerror(errno));
+ return false;
+ }
+
+ if (!S_ISDIR(st.st_mode)) {
+ g_free(dirPath);
+ g_set_error(error_r, simple_db_quark(), 0,
+ "Couldn't create db file \"%s\" because the "
+ "parent path is not a directory",
+ db->path);
+ return false;
+ }
+
+ /* Check if we can write to the directory */
+ if (access(dirPath, X_OK | W_OK)) {
+ g_set_error(error_r, simple_db_quark(), errno,
+ "Can't create db file in \"%s\": %s",
+ dirPath, g_strerror(errno));
+ g_free(dirPath);
+ return false;
+ }
+
+ g_free(dirPath);
+
+ return true;
+ }
+
+ /* Path exists, now check if it's a regular file */
+ struct stat st;
+ if (stat(db->path, &st) < 0) {
+ g_set_error(error_r, simple_db_quark(), errno,
+ "Couldn't stat db file \"%s\": %s",
+ db->path, g_strerror(errno));
+ return false;
+ }
+
+ if (!S_ISREG(st.st_mode)) {
+ g_set_error(error_r, simple_db_quark(), 0,
+ "db file \"%s\" is not a regular file",
+ db->path);
+ return false;
+ }
+
+ /* And check that we can write to it */
+ if (access(db->path, R_OK | W_OK)) {
+ g_set_error(error_r, simple_db_quark(), errno,
+ "Can't open db file \"%s\" for reading/writing: %s",
+ db->path, g_strerror(errno));
+ return false;
+ }
+
+ return true;
+}
+
+static bool
+simple_db_load(struct simple_db *db, GError **error_r)
+{
+ assert(db != NULL);
+ assert(db->path != NULL);
+ assert(db->root != NULL);
+
+ FILE *fp = fopen(db->path, "r");
+ if (fp == NULL) {
+ g_set_error(error_r, simple_db_quark(), errno,
+ "Failed to open database file \"%s\": %s",
+ db->path, g_strerror(errno));
+ return false;
+ }
+
+ if (!db_load_internal(fp, db->root, error_r)) {
+ fclose(fp);
+ return false;
+ }
+
+ fclose(fp);
+
+ struct stat st;
+ if (stat(db->path, &st) == 0)
+ db->mtime = st.st_mtime;
+
+ return true;
+}
+
+static bool
+simple_db_open(struct db *_db, G_GNUC_UNUSED GError **error_r)
+{
+ struct simple_db *db = (struct simple_db *)_db;
+
+ db->root = directory_new("", NULL);
+ db->mtime = 0;
+
+ GError *error = NULL;
+ if (!simple_db_load(db, &error)) {
+ directory_free(db->root);
+
+ g_warning("Failed to load database: %s", error->message);
+ g_error_free(error);
+
+ if (!simple_db_check(db, error_r))
+ return false;
+
+ db->root = directory_new("", NULL);
+ }
+
+ return true;
+}
+
+static void
+simple_db_close(struct db *_db)
+{
+ struct simple_db *db = (struct simple_db *)_db;
+
+ assert(db->root != NULL);
+
+ directory_free(db->root);
+}
+
+const struct db_plugin simple_db_plugin = {
+ .name = "simple",
+ .init = simple_db_init,
+ .finish = simple_db_finish,
+ .open = simple_db_open,
+ .close = simple_db_close,
+};
+
+struct directory *
+simple_db_get_root(struct db *_db)
+{
+ struct simple_db *db = (struct simple_db *)_db;
+
+ assert(db != NULL);
+ assert(db->root != NULL);
+
+ return db->root;
+}
+
+bool
+simple_db_save(struct db *_db, GError **error_r)
+{
+ struct simple_db *db = (struct simple_db *)_db;
+ struct directory *music_root = db->root;
+
+ g_debug("removing empty directories from DB");
+ directory_prune_empty(music_root);
+
+ g_debug("sorting DB");
+
+ directory_sort(music_root);
+
+ g_debug("writing DB");
+
+ FILE *fp = fopen(db->path, "w");
+ if (!fp) {
+ g_set_error(error_r, simple_db_quark(), errno,
+ "unable to write to db file \"%s\": %s",
+ db->path, g_strerror(errno));
+ return false;
+ }
+
+ db_save_internal(fp, music_root);
+
+ if (ferror(fp)) {
+ g_set_error(error_r, simple_db_quark(), errno,
+ "Failed to write to database file: %s",
+ g_strerror(errno));
+ fclose(fp);
+ return false;
+ }
+
+ fclose(fp);
+
+ struct stat st;
+ if (stat(db->path, &st) == 0)
+ db->mtime = st.st_mtime;
+
+ return true;
+}
+
+time_t
+simple_db_get_mtime(const struct db *_db)
+{
+ const struct simple_db *db = (const struct simple_db *)_db;
+
+ assert(db != NULL);
+ assert(db->root != NULL);
+
+ return db->mtime;
+}
diff --git a/src/db/simple_db_plugin.h b/src/db/simple_db_plugin.h
new file mode 100644
index 000000000..511505846
--- /dev/null
+++ b/src/db/simple_db_plugin.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_SIMPLE_DB_PLUGIN_H
+#define MPD_SIMPLE_DB_PLUGIN_H
+
+#include <glib.h>
+#include <stdbool.h>
+#include <time.h>
+
+extern const struct db_plugin simple_db_plugin;
+
+struct db;
+
+G_GNUC_PURE
+struct directory *
+simple_db_get_root(struct db *db);
+
+bool
+simple_db_save(struct db *db, GError **error_r);
+
+G_GNUC_PURE
+time_t
+simple_db_get_mtime(const struct db *db);
+
+#endif
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