1 files changed, 63 insertions, 296 deletions

diff --git a/src/database.c b/src/database.c
index 9f29f95e1..8c903bb45 100644
--- a/src/database.c
+++ b/src/database.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2010 The Music Player Daemon Project
+ * 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
@@ -19,14 +19,16 @@
 
 #include "config.h"
 #include "database.h"
+#include "db_error.h"
+#include "db_save.h"
+#include "db_selection.h"
+#include "db_visitor.h"
+#include "db_plugin.h"
+#include "db/simple_db_plugin.h"
 #include "directory.h"
-#include "directory_save.h"
-#include "song.h"
-#include "path.h"
 #include "stats.h"
-#include "text_file.h"
-#include "tag.h"
-#include "tag_internal.h"
+#include "conf.h"
+#include "glib_compat.h"
 
 #include <glib.h>
 
@@ -35,85 +37,64 @@
 #include <unistd.h>
 #include <assert.h>
 #include <string.h>
-#include <stdlib.h>
 #include <errno.h>
 
 #undef G_LOG_DOMAIN
 #define G_LOG_DOMAIN "database"
 
-#define DIRECTORY_INFO_BEGIN "info_begin"
-#define DIRECTORY_INFO_END "info_end"
-#define DB_FORMAT_PREFIX "format: "
-#define DIRECTORY_MPD_VERSION "mpd_version: "
-#define DIRECTORY_FS_CHARSET "fs_charset: "
-#define DB_TAG_PREFIX "tag: "
+static struct db *db;
+static bool db_is_open;
 
-enum {
-	DB_FORMAT = 1,
-};
-
-static char *database_path;
-
-static struct directory *music_root;
-
-static time_t database_mtime;
-
-/**
- * The quark used for GError.domain.
- */
-static inline GQuark
-db_quark(void)
+bool
+db_init(const struct config_param *path, GError **error_r)
 {
-	return g_quark_from_static_string("database");
-}
+	assert(db == NULL);
+	assert(!db_is_open);
 
-void
-db_init(const char *path)
-{
-	database_path = g_strdup(path);
+	if (path == NULL)
+		return true;
 
-	if (path != NULL)
-		music_root = directory_new("", NULL);
-}
+	struct config_param *param = config_new_param("database", path->line);
+	config_add_block_param(param, "path", path->value, path->line);
 
-void
-db_finish(void)
-{
-	assert((database_path == NULL) == (music_root == NULL));
+	db = db_plugin_new(&simple_db_plugin, param, error_r);
 
-	if (music_root != NULL)
-		directory_free(music_root);
+	config_param_free(param);
 
-	g_free(database_path);
+	return db != NULL;
 }
 
 void
-db_clear(void)
+db_finish(void)
 {
-	assert(music_root != NULL);
+	if (db_is_open)
+		db_plugin_close(db);
 
-	directory_free(music_root);
-	music_root = directory_new("", NULL);
+	if (db != NULL)
+		db_plugin_free(db);
 }
 
 struct directory *
 db_get_root(void)
 {
-	assert(music_root != NULL);
+	assert(db != NULL);
 
-	return music_root;
+	return simple_db_get_root(db);
 }
 
 struct directory *
 db_get_directory(const char *name)
 {
-	if (music_root == NULL)
+	if (db == NULL)
 		return NULL;
 
+	struct directory *music_root = db_get_root();
 	if (name == NULL)
 		return music_root;
 
-	return directory_lookup_directory(music_root, name);
+	struct directory *directory =
+		directory_lookup_directory(music_root, name);
+	return directory;
 }
 
 struct song *
@@ -123,281 +104,67 @@ db_get_song(const char *file)
 
 	g_debug("get song: %s", file);
 
-	if (music_root == NULL)
+	if (db == NULL)
 		return NULL;
 
-	return directory_lookup_song(music_root, file);
+	return db_plugin_get_song(db, file, NULL);
 }
 
-int
-db_walk(const char *name,
-	int (*forEachSong)(struct song *, void *),
-	int (*forEachDir)(struct directory *, void *), void *data)
+bool
+db_visit(const struct db_selection *selection,
+	 const struct db_visitor *visitor, void *ctx,
+	 GError **error_r)
 {
-	struct directory *directory;
-
-	if (music_root == NULL)
-		return -1;
-
-	if ((directory = db_get_directory(name)) == NULL) {
-		struct song *song;
-		if ((song = db_get_song(name)) && forEachSong) {
-			return forEachSong(song, data);
-		}
-		return -1;
+	if (db == NULL) {
+		g_set_error_literal(error_r, db_quark(), DB_DISABLED,
+				    "No database");
+		return false;
 	}
 
-	return directory_walk(directory, forEachSong, forEachDir, data);
+	return db_plugin_visit(db, selection, visitor, ctx, error_r);
 }
 
 bool
-db_check(void)
+db_walk(const char *uri,
+	const struct db_visitor *visitor, void *ctx,
+	GError **error_r)
 {
-	struct stat st;
-
-	assert(database_path != NULL);
-
-	/* Check if the file exists */
-	if (access(database_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(database_path);
-
-		/* Check that the parent part of the path is a directory */
-		if (stat(dirPath, &st) < 0) {
-			g_free(dirPath);
-			g_warning("Couldn't stat parent directory of db file "
-				  "\"%s\": %s", database_path, strerror(errno));
-			return false;
-		}
-
-		if (!S_ISDIR(st.st_mode)) {
-			g_free(dirPath);
-			g_warning("Couldn't create db file \"%s\" because the "
-				  "parent path is not a directory", database_path);
-			return false;
-		}
-
-		/* Check if we can write to the directory */
-		if (access(dirPath, X_OK | W_OK)) {
-			g_warning("Can't create db file in \"%s\": %s",
-				  dirPath, strerror(errno));
-			g_free(dirPath);
-			return false;
-		}
-
-		g_free(dirPath);
-
-		return true;
-	}
-
-	/* Path exists, now check if it's a regular file */
-	if (stat(database_path, &st) < 0) {
-		g_warning("Couldn't stat db file \"%s\": %s",
-			  database_path, strerror(errno));
-		return false;
-	}
+	struct db_selection selection;
+	db_selection_init(&selection, uri, true);
 
-	if (!S_ISREG(st.st_mode)) {
-		g_warning("db file \"%s\" is not a regular file", database_path);
-		return false;
-	}
-
-	/* And check that we can write to it */
-	if (access(database_path, R_OK | W_OK)) {
-		g_warning("Can't open db file \"%s\" for reading/writing: %s",
-			  database_path, strerror(errno));
-		return false;
-	}
-
-	return true;
+	return db_visit(&selection, visitor, ctx, error_r);
 }
 
 bool
-db_save(void)
+db_save(GError **error_r)
 {
-	FILE *fp;
-	struct stat st;
-
-	assert(database_path != NULL);
-	assert(music_root != NULL);
+	assert(db != NULL);
+	assert(db_is_open);
 
-	g_debug("removing empty directories from DB");
-	directory_prune_empty(music_root);
-
-	g_debug("sorting DB");
-
-	directory_sort(music_root);
-
-	g_debug("writing DB");
-
-	fp = fopen(database_path, "w");
-	if (!fp) {
-		g_warning("unable to write to db file \"%s\": %s",
-			  database_path, strerror(errno));
-		return false;
-	}
-
-	fprintf(fp, "%s\n", DIRECTORY_INFO_BEGIN);
-	fprintf(fp, DB_FORMAT_PREFIX "%u\n", DB_FORMAT);
-	fprintf(fp, "%s%s\n", DIRECTORY_MPD_VERSION, VERSION);
-	fprintf(fp, "%s%s\n", DIRECTORY_FS_CHARSET, path_get_fs_charset());
-
-	for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
-		if (!ignore_tag_items[i])
-			fprintf(fp, DB_TAG_PREFIX "%s\n", tag_item_names[i]);
-
-	fprintf(fp, "%s\n", DIRECTORY_INFO_END);
-
-	directory_save(fp, music_root);
-
-	if (ferror(fp)) {
-		g_warning("Failed to write to database file: %s",
-			  strerror(errno));
-		fclose(fp);
-		return false;
-	}
-
-	fclose(fp);
-
-	if (stat(database_path, &st) == 0)
-		database_mtime = st.st_mtime;
-
-	return true;
+	return simple_db_save(db, error_r);
 }
 
 bool
 db_load(GError **error)
 {
-	FILE *fp = NULL;
-	struct stat st;
-	GString *buffer = g_string_sized_new(1024);
-	char *line;
-	int format = 0;
-	bool found_charset = false, found_version = false;
-	bool success;
-	bool tags[TAG_NUM_OF_ITEM_TYPES];
-
-	assert(database_path != NULL);
-	assert(music_root != NULL);
-
-	fp = fopen(database_path, "r");
-	if (fp == NULL) {
-		g_set_error(error, db_quark(), errno,
-			    "Failed to open database file \"%s\": %s",
-			    database_path, strerror(errno));
-		g_string_free(buffer, true);
-		return false;
-	}
-
-	/* get initial info */
-	line = read_text_line(fp, buffer);
-	if (line == NULL || strcmp(DIRECTORY_INFO_BEGIN, line) != 0) {
-		fclose(fp);
-		g_set_error(error, db_quark(), 0, "Database corrupted");
-		g_string_free(buffer, true);
-		return false;
-	}
-
-	memset(tags, false, sizeof(tags));
-
-	while ((line = read_text_line(fp, buffer)) != NULL &&
-	       strcmp(line, DIRECTORY_INFO_END) != 0) {
-		if (g_str_has_prefix(line, DB_FORMAT_PREFIX)) {
-			format = atoi(line + sizeof(DB_FORMAT_PREFIX) - 1);
-		} else if (g_str_has_prefix(line, DIRECTORY_MPD_VERSION)) {
-			if (found_version) {
-				fclose(fp);
-				g_set_error(error, db_quark(), 0,
-					    "Duplicate version line");
-				g_string_free(buffer, true);
-				return false;
-			}
-
-			found_version = true;
-		} else if (g_str_has_prefix(line, DIRECTORY_FS_CHARSET)) {
-			const char *new_charset, *old_charset;
-
-			if (found_charset) {
-				fclose(fp);
-				g_set_error(error, db_quark(), 0,
-					    "Duplicate charset line");
-				g_string_free(buffer, true);
-				return false;
-			}
-
-			found_charset = true;
-
-			new_charset = line + sizeof(DIRECTORY_FS_CHARSET) - 1;
-			old_charset = path_get_fs_charset();
-			if (old_charset != NULL
-			    && strcmp(new_charset, old_charset)) {
-				fclose(fp);
-				g_set_error(error, db_quark(), 0,
-					    "Existing database has charset "
-					    "\"%s\" instead of \"%s\"; "
-					    "discarding database file",
-					    new_charset, old_charset);
-				g_string_free(buffer, true);
-				return false;
-			}
-		} else if (g_str_has_prefix(line, DB_TAG_PREFIX)) {
-			const char *name = line + sizeof(DB_TAG_PREFIX) - 1;
-			enum tag_type tag = tag_name_parse(name);
-			if (tag == TAG_NUM_OF_ITEM_TYPES) {
-				g_set_error(error, db_quark(), 0,
-					    "Unrecognized tag '%s', "
-					    "discarding database file",
-					    name);
-				return false;
-			}
-
-			tags[tag] = true;
-		} else {
-			fclose(fp);
-			g_set_error(error, db_quark(), 0,
-				    "Malformed line: %s", line);
-			g_string_free(buffer, true);
-			return false;
-		}
-	}
+	assert(db != NULL);
+	assert(!db_is_open);
 
-	if (format != DB_FORMAT) {
-		g_set_error(error, db_quark(), 0,
-			    "Database format mismatch, "
-			    "discarding database file");
+	if (!db_plugin_open(db, error))
 		return false;
-	}
-
-	for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i) {
-		if (!ignore_tag_items[i] && !tags[i]) {
-			g_set_error(error, db_quark(), 0,
-				    "Tag list mismatch, "
-				    "discarding database file");
-			return false;
-		}
-	}
-
-	g_debug("reading DB");
 
-	success = directory_load(fp, music_root, buffer, error);
-	g_string_free(buffer, true);
-	fclose(fp);
-
-	if (!success)
-		return false;
+	db_is_open = true;
 
 	stats_update();
 
-	if (stat(database_path, &st) == 0)
-		database_mtime = st.st_mtime;
-
 	return true;
 }
 
 time_t
 db_get_mtime(void)
 {
-	return database_mtime;
+	assert(db != NULL);
+	assert(db_is_open);
+
+	return simple_db_get_mtime(db);
 }