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@ -1,37 +1,16 @@
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package db
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package db
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import (
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import (
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"database/sql"
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"database/sql/driver"
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"database/sql/driver"
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"fmt"
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"fmt"
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"io"
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"io"
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"sync"
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"time"
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"time"
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"github.com/mattn/go-sqlite3"
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"github.com/mattn/go-sqlite3"
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)
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)
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// Hook into the SQLite3 connection.
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//
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// This connection, mutex, and init() allows each Open() call to get access
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// to the driver's internal conn object. The mutex ensures only 1 Open() call
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// can run concurrently, and when it has returned, sqlite3conn will be set to
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// the connection. This connection can be used for backups.
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var sqlite3conn *sqlite3.SQLiteConn
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var openMu sync.Mutex
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const bkDelay = 250
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const bkDelay = 250
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func init() {
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sql.Register("sqlite3_with_hook",
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&sqlite3.SQLiteDriver{
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ConnectHook: func(conn *sqlite3.SQLiteConn) error {
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sqlite3conn = conn
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return nil
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},
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})
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}
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// Config represents the configuration of the SQLite database.
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// Config represents the configuration of the SQLite database.
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type Config struct {
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type Config struct {
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DSN string // Datasource name
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DSN string // Datasource name
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@ -53,7 +32,6 @@ func (c *Config) FQDSN(path string) string {
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// DB is the SQL database.
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// DB is the SQL database.
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type DB struct {
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type DB struct {
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conn *sql.DB // Abstract Connection to database.
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sqlite3conn *sqlite3.SQLiteConn // Driver connection to database.
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sqlite3conn *sqlite3.SQLiteConn // Driver connection to database.
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path string // Path to database file.
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path string // Path to database file.
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}
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}
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@ -77,65 +55,44 @@ type Rows struct {
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// Open an existing database, creating it if it does not exist.
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// Open an existing database, creating it if it does not exist.
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func Open(dbPath string) (*DB, error) {
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func Open(dbPath string) (*DB, error) {
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openMu.Lock()
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d := sqlite3.SQLiteDriver{}
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defer openMu.Unlock()
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dbc, err := d.Open(dbPath)
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dbc, err := sql.Open("sqlite3_with_hook", dbPath)
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if err != nil {
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if err != nil {
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return nil, err
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return nil, err
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}
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}
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// Ensure a connection is established before going further. Ignore error
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// because database may not exist yet.
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_ = dbc.Ping()
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return &DB{
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return &DB{
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conn: dbc,
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sqlite3conn: dbc.(*sqlite3.SQLiteConn),
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sqlite3conn: sqlite3conn,
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path: dbPath,
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path: dbPath,
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}, nil
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}, nil
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}
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}
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// OpenWithConfiguration an existing database, creating it if it does not exist.
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// OpenWithConfiguration an existing database, creating it if it does not exist.
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func OpenWithConfiguration(dbPath string, conf *Config) (*DB, error) {
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func OpenWithConfiguration(dbPath string, conf *Config) (*DB, error) {
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openMu.Lock()
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return Open(conf.FQDSN(dbPath))
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defer openMu.Unlock()
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dbc, err := sql.Open("sqlite3_with_hook", conf.FQDSN(dbPath))
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if err != nil {
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return nil, err
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}
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// Ensure a connection is established before going further. Ignore error
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// because database may not exist yet.
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_ = dbc.Ping()
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return &DB{
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conn: dbc,
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sqlite3conn: sqlite3conn,
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path: conf.FQDSN(dbPath),
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}, nil
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}
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}
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// Close closes the underlying database connection.
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// Close closes the underlying database connection.
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func (db *DB) Close() error {
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func (db *DB) Close() error {
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return db.conn.Close()
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return db.sqlite3conn.Close()
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}
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}
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// Execute executes queries that modify the database.
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// Execute executes queries that modify the database.
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func (db *DB) Execute(queries []string, tx, xTime bool) ([]*Result, error) {
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func (db *DB) Execute(queries []string, tx, xTime bool) ([]*Result, error) {
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type Execer interface {
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type Execer interface {
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Exec(query string, args ...interface{}) (sql.Result, error)
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Exec(query string, args []driver.Value) (driver.Result, error)
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}
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}
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var allResults []*Result
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var allResults []*Result
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err := func() error {
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err := func() (error) {
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var execer Execer
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var execer Execer
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var rollback bool
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var rollback bool
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var t driver.Tx
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var err error
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// Check for the err, if set rollback.
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// Check for the err, if set rollback.
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defer func() {
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defer func() {
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if t, ok := execer.(*sql.Tx); ok {
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if t != nil {
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if rollback {
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if rollback {
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t.Rollback()
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t.Rollback()
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return
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return
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@ -156,12 +113,15 @@ func (db *DB) Execute(queries []string, tx, xTime bool) ([]*Result, error) {
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return true
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return true
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}
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}
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execer = db.sqlite3conn
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// Create the correct execution object, depending on whether a
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// Create the correct execution object, depending on whether a
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// transaction was requested.
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// transaction was requested.
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if tx {
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if tx {
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execer, _ = db.conn.Begin()
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t, err = db.sqlite3conn.Begin()
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} else {
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if err != nil {
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execer = db.conn
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return err
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}
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}
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}
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// Execute each query.
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// Execute each query.
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@ -173,7 +133,7 @@ func (db *DB) Execute(queries []string, tx, xTime bool) ([]*Result, error) {
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result := &Result{}
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result := &Result{}
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start := time.Now()
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start := time.Now()
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r, err := execer.Exec(q)
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r, err := execer.Exec(q, nil)
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if err != nil {
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if err != nil {
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if handleError(result, err) {
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if handleError(result, err) {
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continue
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continue
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@ -231,10 +191,6 @@ func (db *DB) Query(queries []string, tx, xTime bool) ([]*Rows, error) {
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}
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}
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}()
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}()
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if db.sqlite3conn == nil {
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// handle race for issue #72
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db.sqlite3conn = sqlite3conn
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}
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queryer = db.sqlite3conn
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queryer = db.sqlite3conn
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// Create the correct query object, depending on whether a
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// Create the correct query object, depending on whether a
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