twitch-bot/pkg/database/connector.go

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package database
import (
"database/sql"
"net/url"
"strings"
"time"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/glebarez/sqlite"
mysqlDriver "github.com/go-sql-driver/mysql"
"gorm.io/driver/mysql"
"gorm.io/driver/postgres"
"gorm.io/gorm"
"gorm.io/gorm/logger"
)
const (
mysqlMaxIdleConnections = 2 // Default as of Go 1.20
mysqlMaxOpenConnections = 10
)
type (
connector struct {
db *gorm.DB
encryptionSecret string
}
)
// ErrCoreMetaNotFound is the error thrown when reading a non-existent
// core_kv key
var ErrCoreMetaNotFound = errors.New("core meta entry not found")
// New creates a new Connector with the given driver and database
func New(driverName, connString, encryptionSecret string) (Connector, error) {
var (
dbTuner func(*sql.DB, error) error
innerDB gorm.Dialector
)
switch driverName {
case "mysql":
mysqlDriver.SetLogger(NewLogrusLogWriterWithLevel(logrus.StandardLogger(), logrus.ErrorLevel, driverName))
innerDB = mysql.Open(connString)
dbTuner = tuneMySQLDatabase
case "postgres":
innerDB = postgres.Open(connString)
case "sqlite":
var err error
if connString, err = patchSQLiteConnString(connString); err != nil {
return nil, errors.Wrap(err, "patching connection string")
}
innerDB = sqlite.Open(connString)
dbTuner = tuneSQLiteDatabase
default:
return nil, errors.Errorf("unknown database driver %s", driverName)
}
db, err := gorm.Open(innerDB, &gorm.Config{
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DisableForeignKeyConstraintWhenMigrating: true,
Logger: logger.New(NewLogrusLogWriterWithLevel(logrus.StandardLogger(), logrus.TraceLevel, driverName), logger.Config{
SlowThreshold: time.Second,
Colorful: false,
IgnoreRecordNotFoundError: false,
ParameterizedQueries: false,
LogLevel: logger.Info,
}),
})
if err != nil {
return nil, errors.Wrap(err, "connecting database")
}
if dbTuner != nil {
if err = dbTuner(db.DB()); err != nil {
return nil, errors.Wrap(err, "tuning database")
}
}
conn := &connector{
db: db,
encryptionSecret: encryptionSecret,
}
return conn, errors.Wrap(conn.applyCoreSchema(), "applying core schema")
}
func (c connector) Close() error {
return nil
}
func (c connector) CopyDatabase(src, target *gorm.DB) error {
return CopyObjects(src, target, &coreKV{})
}
func (c connector) DB() *gorm.DB {
return c.db
}
func (c connector) applyCoreSchema() error {
return errors.Wrap(c.db.AutoMigrate(&coreKV{}), "applying coreKV schema")
}
func patchSQLiteConnString(connString string) (string, error) {
u, err := url.Parse(connString)
if err != nil {
return connString, errors.Wrap(err, "parsing connString")
}
q := u.Query()
q.Add("_pragma", "locking_mode(EXCLUSIVE)")
q.Add("_pragma", "synchronous(FULL)")
u.RawQuery = strings.NewReplacer(
"%28", "(",
"%29", ")",
).Replace(q.Encode())
return u.String(), nil
}
func tuneMySQLDatabase(db *sql.DB, err error) error {
if err != nil {
return errors.Wrap(err, "getting database")
}
// By default the package allows unlimited connections and the
// default value of a MySQL / MariaDB server is to allow 151
// connections at most. Therefore we tune the connection pool to
// sane values in order not to flood the database with connections
// in case a lot of events occur at the same time.
db.SetConnMaxIdleTime(time.Hour)
db.SetConnMaxLifetime(time.Hour)
db.SetMaxIdleConns(mysqlMaxIdleConnections)
db.SetMaxOpenConns(mysqlMaxOpenConnections)
return nil
}
func tuneSQLiteDatabase(db *sql.DB, err error) error {
if err != nil {
return errors.Wrap(err, "getting database")
}
db.SetConnMaxIdleTime(0)
db.SetConnMaxLifetime(0)
db.SetMaxIdleConns(1)
db.SetMaxOpenConns(1)
return nil
}