magneticod: add mysql support

src/magneticod/persistence.go

@@ -5,6 +5,7 @@ import (
 	"database/sql"
 	"net/url"
 
+	_ "github.com/go-sql-driver/mysql"
 	_ "github.com/mattn/go-sqlite3"
 	"go.uber.org/zap"
 
@@ -14,22 +15,20 @@ import (
 	"os"
 )
 
-
 type engineType uint8
 
 const (
-	SQLITE engineType = 0
-	POSTGRESQL = 1
+	SQLITE     engineType = 0
+	POSTGRESQL            = 1
+	MYSQL                 = 2
 )
 
-
 type Database struct {
-	database *sql.DB
-	engine engineType
+	database    *sql.DB
+	engine      engineType
 	newTorrents chan bittorrent.Metadata
 }
 
-
 // NewDatabase creates a new Database.
 //
 // url either starts with "sqlite:" or "postgresql:"
@@ -66,6 +65,10 @@ func NewDatabase(rawurl string) (*Database, error) {
 		db.engine = POSTGRESQL
 		db.database, err = sql.Open("postgresql", rawurl)
 
+	case "mysql":
+		db.engine = MYSQL
+		db.database, err = sql.Open("mysql", rawurl)
+
 	default:
 		return nil, fmt.Errorf("unknown URI scheme (or malformed URI)!")
 	}
@@ -88,7 +91,6 @@ func NewDatabase(rawurl string) (*Database, error) {
 	return &db, nil
 }
 
-
 // AddNewTorrent adds a new torrent to the *queue* to be flushed to the persistent database.
 func (db *Database) AddNewTorrent(torrent bittorrent.Metadata) error {
 	for {
@@ -106,7 +108,6 @@ func (db *Database) AddNewTorrent(torrent bittorrent.Metadata) error {
 	}
 }
 
-
 func (db *Database) flushNewTorrents() error {
 	tx, err := db.database.Begin()
 	if err != nil {
@@ -154,13 +155,11 @@ func (db *Database) flushNewTorrents() error {
 	return nil
 }
 
-
 func (db *Database) Close() {
 	// Be careful to not to get into an infinite loop. =)
 	db.database.Close()
 }
 
-
 func (db *Database) setupDatabase() error {
 	switch db.engine {
 	case SQLITE:
@@ -169,6 +168,9 @@ func (db *Database) setupDatabase() error {
 	case POSTGRESQL:
 		zap.L().Fatal("setupDatabase() is not implemented for PostgreSQL yet!")
 
+	case MYSQL:
+		return setupMySQLDatabase(db.database)
+
 	default:
 		zap.L().Sugar().Fatalf("Unknown database engine value %d! (programmer error)", db.engine)
 	}
@@ -176,7 +178,6 @@ func (db *Database) setupDatabase() error {
 	return nil
 }
 
-
 func setupSqliteDatabase(database *sql.DB) error {
 	// Enable Write-Ahead Logging for SQLite as "WAL provides more concurrency as readers do not
 	// block writers and a writer does not block readers. Reading and writing can proceed
@@ -226,3 +227,30 @@ func setupSqliteDatabase(database *sql.DB) error {
 
 	return nil
 }
+
+func setupMySQLDatabase(database *sql.DB) error {
+	_, err := database.Exec(
+		`CREATE TABLE IF NOT EXISTS torrents ("
+			id		INTEGER PRIMARY KEY AUTO_INCREMENT,
+			info_hash	BINARY(20) NOT NULL UNIQUE,
+			name		VARCHAR(255) NOT NULL,
+			total_size	BIGINT UNSIGNED NOT NULL,
+			discovered_on	INTEGER UNSIGNED NOT NULL
+		);
+
+		ALTER TABLE torrents ADD INDEX info_hash_index (info_hash);
+
+		CREATE TABLE IF NOT EXISTS files (
+			id		INTEGER PRIMARY KEY AUTO_INCREMENT,
+			torrent_id	INTEGER REFERENCES torrents (id) ON DELETE CASCADE ON UPDATE RESTRICT,
+			size		BIGINT NOT NULL,
+			path		TEXT NOT NULL
+		);`,
+	)
+
+	if err != nil {
+		return err
+	}
+
+	return nil
+}