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mysql.go
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mysql.go
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package db
import (
"context"
"database/sql"
"fmt"
"runtime/trace"
"strings"
"sync"
"github.com/go-sql-driver/mysql"
"pixur.org/pixur/be/status"
)
const (
innoDbDeadlockErrorNumber = 1213
)
var _ DBAdapter = &mysqlAdapter{}
type mysqlAdapter struct{}
func (a *mysqlAdapter) Open(ctx context.Context, dataSourceName string) (DB, error) {
return a.open(ctx, dataSourceName)
}
func (a *mysqlAdapter) open(ctx context.Context, dataSourceName string) (
_ *dbWrapper, stscap status.S) {
if trace.IsEnabled() {
defer trace.StartRegion(ctx, "SqlOpen").End()
}
db, err := sql.Open(a.Name(), dataSourceName)
if err != nil {
return nil, status.Unknown(&sqlError{
wrapped: err,
adap: a,
}, "can't open db")
}
defer func() {
if stscap != nil {
if closeErr := db.Close(); closeErr != nil {
stscap = status.WithSuppressed(stscap, closeErr)
}
}
}()
if err := db.Ping(); err != nil {
return nil, status.Unknown(&sqlError{
wrapped: err,
adap: a,
}, "can't ping")
}
// TODO: make this configurable
db.SetMaxOpenConns(20)
return &dbWrapper{db: db, adap: a}, nil
}
func (_ *mysqlAdapter) Name() string {
return "mysql"
}
func (a *mysqlAdapter) OpenForTest(ctx context.Context) (DB, error) {
return a.openForTest(ctx)
}
func (a *mysqlAdapter) openForTest(ctx context.Context) (_ *mysqlTestDB, stscap status.S) {
if trace.IsEnabled() {
defer trace.StartRegion(ctx, "SqlTestOpen").End()
}
mysqlTestServLock.Lock()
defer mysqlTestServLock.Unlock()
if mysqlTestServ == nil {
mysqlTestServ = new(mysqlTestServer)
if sts := mysqlTestServ.setupEnv(); sts != nil {
return nil, sts
}
defer func() {
if stscap != nil {
if teardownsts := mysqlTestServ.tearDownEnv(); teardownsts != nil {
stscap = status.WithSuppressed(stscap, teardownsts)
}
}
}()
if sts := mysqlTestServ.start(); sts != nil {
return nil, sts
}
defer func() {
if stscap != nil {
if stopsts := mysqlTestServ.stop(); stopsts != nil {
stscap = status.WithSuppressed(stscap, stopsts)
}
}
}()
}
rawdb, err := sql.Open(a.Name(), "unix("+mysqlTestServ.socket+")/")
if err != nil {
return nil, status.Unknown(&sqlError{
wrapped: err,
adap: a,
}, "can't open db")
}
mysqlTestServ.total++
dbName := fmt.Sprintf("testdb%d", mysqlTestServ.total)
if _, err := rawdb.Exec(fmt.Sprintf("CREATE DATABASE IF NOT EXISTS %s;", dbName)); err != nil {
return nil, status.Unknown(&sqlError{
wrapped: err,
adap: a,
}, "can't create db")
}
// Close our connection, so we can reopen with the correct db name. Other threads
// will not use the correct database by default.
if err := rawdb.Close(); err != nil {
return nil, status.Unknown(&sqlError{
wrapped: err,
adap: a,
}, "can't close db")
}
db, sts := a.open(ctx, "unix("+mysqlTestServ.socket+")/"+dbName)
if sts != nil {
return nil, sts
}
mysqlTestServ.active++
return &mysqlTestDB{dbWrapper: db}, nil
}
type mysqlTestDB struct {
*dbWrapper
closed bool
}
func (a *mysqlTestDB) Close() error {
return a._close()
}
func (a *mysqlTestDB) _close() status.S {
sts := a.dbWrapper._close()
if !a.closed {
a.closed = true
mysqlTestServLock.Lock()
defer mysqlTestServLock.Unlock()
mysqlTestServ.active--
if mysqlTestServ.active == 0 {
if stopsts := mysqlTestServ.stop(); stopsts != nil {
status.ReplaceOrSuppress(&sts, stopsts)
}
if teardownsts := mysqlTestServ.tearDownEnv(); teardownsts != nil {
status.ReplaceOrSuppress(&sts, teardownsts)
}
mysqlTestServ = nil
}
}
return sts
}
var (
mysqlTestServ *mysqlTestServer
mysqlTestServLock = new(sync.Mutex)
)
func (_ *mysqlAdapter) Quote(ident string) string {
if strings.ContainsAny(ident, "\"\x00`") {
panic(fmt.Sprintf("Invalid identifier %#v", ident))
}
return "`" + ident + "`"
}
func (a *mysqlAdapter) BlobIdxQuote(ident string) string {
if strings.ContainsAny(ident, "\"\x00`") {
panic(fmt.Sprintf("Invalid identifier %#v", ident))
}
return "`" + ident + "`(255)"
}
func (_ *mysqlAdapter) BoolType() string {
return "bool"
}
func (_ *mysqlAdapter) IntType() string {
return "int"
}
func (_ *mysqlAdapter) BigIntType() string {
return "bigint(20)"
}
func (_ *mysqlAdapter) BlobType() string {
return "blob"
}
func (_ *mysqlAdapter) LockStmt(buf *strings.Builder, lock Lock) {
switch lock {
case LockNone:
case LockRead:
buf.WriteString(" LOCK IN SHARE MODE")
case LockWrite:
buf.WriteString(" FOR UPDATE")
default:
panic(fmt.Errorf("Unknown lock %v", lock))
}
}
func (_ *mysqlAdapter) RetryableErr(err error) bool {
if myerr, ok := err.(*mysql.MySQLError); ok {
return myerr.Number == innoDbDeadlockErrorNumber
}
return false
}
func init() {
RegisterAdapter(new(mysqlAdapter))
}