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Create a new version of the Store class based on libgda
This new Store is still missing quite a bit of functionality, but it'll come back with time. Requires a build of libgda from git (5.1.0) with vala bindings and extensions enabled - which requires a development version of vala. Good luck building this, anyone except me ;) References: gh-10
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| /* | ||
| * Riker - a MusicBrainz-enhanced audio player | ||
| * Copyright © 2011 Calvin Walton | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of version 2 of the GNU General Public | ||
| * License as published by the Free Software Foundation. | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
||
| namespace Riker { | ||
|
|
||
| /** | ||
| * Various errors that can happen due to database interactions. | ||
| */ | ||
| public errordomain StoreError { | ||
| OPEN_FAILED, | ||
| UNSUPPORTED_SCHEMA, | ||
| CORRUPT_DB, | ||
| INSTALLATION_ERROR, | ||
| BUG | ||
| } | ||
|
|
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| /** | ||
| * The store represents the database backend where information is stored. | ||
| */ | ||
| public class Store: Object { | ||
|
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| /** | ||
| * The database schema version supported by this version of Riker. | ||
| * | ||
| * If this is 0, then Riker is using an unstable schema. | ||
| */ | ||
| private const int SCHEMA_VERSION = 0; | ||
|
|
||
| /** | ||
| * The oldest database schema version supported for upgrades. | ||
| */ | ||
| private const int MIN_SCHEMA_VERSION = 1; | ||
|
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| /** | ||
| * The newest schema version supported for upgrades. | ||
| * | ||
| * This is normally set to SCHEMA_VERSION - 1, unless SCHEMA_VERSION | ||
| * is 0 | ||
| */ | ||
| private const int MAX_SCHEMA_VERSION = 1; | ||
|
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| private const string DSN_NAME = "RikerStore"; | ||
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| private const string DSN_PROVIDER = "SQLite"; | ||
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| private const string DSN_DB_NAME = "riker-store"; | ||
|
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| /** | ||
| * The Database connection. | ||
| */ | ||
| private Gda.Connection connection; | ||
|
|
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| /** | ||
| * Create a new Store instance using the default database location. | ||
| * | ||
| * This is normally in a ~/.local/share/riker/store.db, but varies by | ||
| * platform. | ||
| */ | ||
| public Store() { | ||
|
|
||
| } | ||
|
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| /** | ||
| * Open the database, and prepare it for use. | ||
| * | ||
| * This function will create the database if it doesn't exist, | ||
| * initialize the schema, and perform any appropriate upgrades. | ||
| * | ||
| * @throws StoreError The database could not be initialized. The error | ||
| * type and message will provide details. If this error is | ||
| * given, the Store object must not be used. | ||
| */ | ||
| public void open() throws StoreError { | ||
| /* A few helpful warnings for testers... */ | ||
| if (SCHEMA_VERSION == 0) { | ||
| stderr.printf( | ||
| "This version of Riker uses an unstable database schema. If you update Riker\n" + | ||
| "you must delete the database file and either restore a backup from an older\n" + | ||
| "stable version or rescan your music collection.\n"); | ||
| } | ||
|
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| /* Attempt to connect using the libgda database configuration */ | ||
| try { | ||
| connection = Gda.Connection.open_from_dsn("RikerStore", null, Gda.ConnectionOptions.NONE); | ||
| } catch (Error error) { | ||
| if (error.domain == Gda.Connection.error_quark() && | ||
| error.code == Gda.ConnectionError.DSN_NOT_FOUND_ERROR) { | ||
| /* | ||
| * There is no database configuration for Riker, | ||
| * so create a default configuration. | ||
| */ | ||
| stderr.printf("Database configuration not found, creating default.\n"); | ||
| create_dsn(); | ||
| try { | ||
| connection = Gda.Connection.open_from_dsn("RikerStore", null, Gda.ConnectionOptions.NONE); | ||
| } catch (Error inner_error) { | ||
| throw new StoreError.OPEN_FAILED("Failed to connect to database: " + inner_error.message); | ||
| } | ||
| } else { | ||
| throw new StoreError.OPEN_FAILED("Failed to connect to database: " + error.message); | ||
| } | ||
| } | ||
| } | ||
|
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| private void create_dsn() throws StoreError { | ||
| var dsn_db_dir = Path.build_filename(Environment.get_user_data_dir(), Config.PACKAGE_TARNAME); | ||
| var cnc_string = "DB_DIR=%s;DB_NAME=%s;FK=TRUE".printf(dsn_db_dir, DSN_DB_NAME); | ||
|
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| Gda.DsnInfo dsn_info = { | ||
| DSN_NAME, | ||
| DSN_PROVIDER, | ||
| null, | ||
| cnc_string, | ||
| null, | ||
| false | ||
| }; | ||
|
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| try { | ||
| Gda.Config.define_dsn(dsn_info); | ||
| connection = Gda.Connection.open_from_dsn("RikerStore", null, Gda.ConnectionOptions.NONE); | ||
| } catch (Error inner_error) { | ||
| throw new StoreError.OPEN_FAILED("Failed to create DB configuration: " + inner_error.message); | ||
| } | ||
| } | ||
|
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| /** | ||
| * Load the base schema into a fresh database. | ||
| */ | ||
| private void initialize_schema() throws StoreError { | ||
|
|
||
| } | ||
| } | ||
|
|
||
| } |
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