Add busy-timeout-interval setting (#620)

cmd/litestream/main.go

@@ -287,6 +287,7 @@ type DBConfig struct {
 	MetaPath           *string        `yaml:"meta-path"`
 	MonitorInterval    *time.Duration `yaml:"monitor-interval"`
 	CheckpointInterval *time.Duration `yaml:"checkpoint-interval"`
+	BusyTimeout        *time.Duration `yaml:"busy-timeout"`
 	MinCheckpointPageN *int           `yaml:"min-checkpoint-page-count"`
 	MaxCheckpointPageN *int           `yaml:"max-checkpoint-page-count"`
 
@@ -313,6 +314,9 @@ func NewDBFromConfig(dbc *DBConfig) (*litestream.DB, error) {
 	if dbc.CheckpointInterval != nil {
 		db.CheckpointInterval = *dbc.CheckpointInterval
 	}
+	if dbc.BusyTimeout != nil {
+		db.BusyTimeout = *dbc.BusyTimeout
+	}
 	if dbc.MinCheckpointPageN != nil {
 		db.MinCheckpointPageN = *dbc.MinCheckpointPageN
 	}

db.go

@@ -28,6 +28,7 @@ import (
 const (
 	DefaultMonitorInterval    = 1 * time.Second
 	DefaultCheckpointInterval = 1 * time.Minute
+	DefaultBusyTimeout        = 1 * time.Second
 	DefaultMinCheckpointPageN = 1000
 	DefaultMaxCheckpointPageN = 10000
 	DefaultTruncatePageN      = 500000
@@ -37,9 +38,6 @@ const (
 // If this index is reached then a new generation will be started.
 const MaxIndex = 0x7FFFFFFF
 
-// BusyTimeout is the timeout to wait for EBUSY from SQLite.
-const BusyTimeout = 1 * time.Second
-
 // DB represents a managed instance of a SQLite database in the file system.
 type DB struct {
 	mu       sync.RWMutex
@@ -103,6 +101,9 @@ type DB struct {
 	// Frequency at which to perform db sync.
 	MonitorInterval time.Duration
 
+	// The timeout to wait for EBUSY from SQLite.
+	BusyTimeout time.Duration
+
 	// List of replicas for the database.
 	// Must be set before calling Open().
 	Replicas []*Replica
@@ -125,6 +126,7 @@ func NewDB(path string) *DB {
 		TruncatePageN:      DefaultTruncatePageN,
 		CheckpointInterval: DefaultCheckpointInterval,
 		MonitorInterval:    DefaultMonitorInterval,
+		BusyTimeout:        DefaultBusyTimeout,
 		Logger:             slog.With("db", path),
 	}
 
@@ -411,7 +413,7 @@ func (db *DB) init() (err error) {
 	db.dirInfo = fi
 
 	dsn := db.path
-	dsn += fmt.Sprintf("?_busy_timeout=%d", BusyTimeout.Milliseconds())
+	dsn += fmt.Sprintf("?_busy_timeout=%d", db.BusyTimeout.Milliseconds())
 
 	// Connect to SQLite database. Use the driver registered with a hook to
 	// prevent WAL files from being removed.