gotosocial/vendor/github.com/uptrace/bun/db.go

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package bun
import (
"context"
"crypto/rand"
"database/sql"
"encoding/hex"
"fmt"
"reflect"
"strings"
"sync/atomic"
"github.com/uptrace/bun/dialect/feature"
"github.com/uptrace/bun/internal"
"github.com/uptrace/bun/schema"
)
const (
discardUnknownColumns internal.Flag = 1 << iota
)
type DBStats struct {
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Queries uint32
Errors uint32
}
type DBOption func(db *DB)
func WithDiscardUnknownColumns() DBOption {
return func(db *DB) {
db.flags = db.flags.Set(discardUnknownColumns)
}
}
type DB struct {
*sql.DB
dialect schema.Dialect
features feature.Feature
queryHooks []QueryHook
fmter schema.Formatter
flags internal.Flag
stats DBStats
}
func NewDB(sqldb *sql.DB, dialect schema.Dialect, opts ...DBOption) *DB {
dialect.Init(sqldb)
db := &DB{
DB: sqldb,
dialect: dialect,
features: dialect.Features(),
fmter: schema.NewFormatter(dialect),
}
for _, opt := range opts {
opt(db)
}
return db
}
func (db *DB) String() string {
var b strings.Builder
b.WriteString("DB<dialect=")
b.WriteString(db.dialect.Name().String())
b.WriteString(">")
return b.String()
}
func (db *DB) DBStats() DBStats {
return DBStats{
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Queries: atomic.LoadUint32(&db.stats.Queries),
Errors: atomic.LoadUint32(&db.stats.Errors),
}
}
func (db *DB) NewValues(model interface{}) *ValuesQuery {
return NewValuesQuery(db, model)
}
func (db *DB) NewSelect() *SelectQuery {
return NewSelectQuery(db)
}
func (db *DB) NewInsert() *InsertQuery {
return NewInsertQuery(db)
}
func (db *DB) NewUpdate() *UpdateQuery {
return NewUpdateQuery(db)
}
func (db *DB) NewDelete() *DeleteQuery {
return NewDeleteQuery(db)
}
func (db *DB) NewCreateTable() *CreateTableQuery {
return NewCreateTableQuery(db)
}
func (db *DB) NewDropTable() *DropTableQuery {
return NewDropTableQuery(db)
}
func (db *DB) NewCreateIndex() *CreateIndexQuery {
return NewCreateIndexQuery(db)
}
func (db *DB) NewDropIndex() *DropIndexQuery {
return NewDropIndexQuery(db)
}
func (db *DB) NewTruncateTable() *TruncateTableQuery {
return NewTruncateTableQuery(db)
}
func (db *DB) NewAddColumn() *AddColumnQuery {
return NewAddColumnQuery(db)
}
func (db *DB) NewDropColumn() *DropColumnQuery {
return NewDropColumnQuery(db)
}
func (db *DB) ResetModel(ctx context.Context, models ...interface{}) error {
for _, model := range models {
if _, err := db.NewDropTable().Model(model).IfExists().Cascade().Exec(ctx); err != nil {
return err
}
if _, err := db.NewCreateTable().Model(model).Exec(ctx); err != nil {
return err
}
}
return nil
}
func (db *DB) Dialect() schema.Dialect {
return db.dialect
}
func (db *DB) ScanRows(ctx context.Context, rows *sql.Rows, dest ...interface{}) error {
defer rows.Close()
model, err := newModel(db, dest)
if err != nil {
return err
}
_, err = model.ScanRows(ctx, rows)
if err != nil {
return err
}
return rows.Err()
}
func (db *DB) ScanRow(ctx context.Context, rows *sql.Rows, dest ...interface{}) error {
model, err := newModel(db, dest)
if err != nil {
return err
}
rs, ok := model.(rowScanner)
if !ok {
return fmt.Errorf("bun: %T does not support ScanRow", model)
}
return rs.ScanRow(ctx, rows)
}
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type queryHookIniter interface {
Init(db *DB)
}
func (db *DB) AddQueryHook(hook QueryHook) {
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if initer, ok := hook.(queryHookIniter); ok {
initer.Init(db)
}
db.queryHooks = append(db.queryHooks, hook)
}
func (db *DB) Table(typ reflect.Type) *schema.Table {
return db.dialect.Tables().Get(typ)
}
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// RegisterModel registers models by name so they can be referenced in table relations
// and fixtures.
func (db *DB) RegisterModel(models ...interface{}) {
db.dialect.Tables().Register(models...)
}
func (db *DB) clone() *DB {
clone := *db
l := len(clone.queryHooks)
clone.queryHooks = clone.queryHooks[:l:l]
return &clone
}
func (db *DB) WithNamedArg(name string, value interface{}) *DB {
clone := db.clone()
clone.fmter = clone.fmter.WithNamedArg(name, value)
return clone
}
func (db *DB) Formatter() schema.Formatter {
return db.fmter
}
// UpdateFQN returns a fully qualified column name. For MySQL, it returns the column name with
// the table alias. For other RDBMS, it returns just the column name.
func (db *DB) UpdateFQN(alias, column string) Ident {
if db.HasFeature(feature.UpdateMultiTable) {
return Ident(alias + "." + column)
}
return Ident(column)
}
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// HasFeature uses feature package to report whether the underlying DBMS supports this feature.
func (db *DB) HasFeature(feat feature.Feature) bool {
return db.fmter.HasFeature(feat)
}
//------------------------------------------------------------------------------
func (db *DB) Exec(query string, args ...interface{}) (sql.Result, error) {
return db.ExecContext(context.Background(), query, args...)
}
func (db *DB) ExecContext(
ctx context.Context, query string, args ...interface{},
) (sql.Result, error) {
formattedQuery := db.format(query, args)
ctx, event := db.beforeQuery(ctx, nil, query, args, formattedQuery, nil)
res, err := db.DB.ExecContext(ctx, formattedQuery)
db.afterQuery(ctx, event, res, err)
return res, err
}
func (db *DB) Query(query string, args ...interface{}) (*sql.Rows, error) {
return db.QueryContext(context.Background(), query, args...)
}
func (db *DB) QueryContext(
ctx context.Context, query string, args ...interface{},
) (*sql.Rows, error) {
formattedQuery := db.format(query, args)
ctx, event := db.beforeQuery(ctx, nil, query, args, formattedQuery, nil)
rows, err := db.DB.QueryContext(ctx, formattedQuery)
db.afterQuery(ctx, event, nil, err)
return rows, err
}
func (db *DB) QueryRow(query string, args ...interface{}) *sql.Row {
return db.QueryRowContext(context.Background(), query, args...)
}
func (db *DB) QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row {
formattedQuery := db.format(query, args)
ctx, event := db.beforeQuery(ctx, nil, query, args, formattedQuery, nil)
row := db.DB.QueryRowContext(ctx, formattedQuery)
db.afterQuery(ctx, event, nil, row.Err())
return row
}
func (db *DB) format(query string, args []interface{}) string {
return db.fmter.FormatQuery(query, args...)
}
//------------------------------------------------------------------------------
type Conn struct {
db *DB
*sql.Conn
}
func (db *DB) Conn(ctx context.Context) (Conn, error) {
conn, err := db.DB.Conn(ctx)
if err != nil {
return Conn{}, err
}
return Conn{
db: db,
Conn: conn,
}, nil
}
func (c Conn) ExecContext(
ctx context.Context, query string, args ...interface{},
) (sql.Result, error) {
formattedQuery := c.db.format(query, args)
ctx, event := c.db.beforeQuery(ctx, nil, query, args, formattedQuery, nil)
res, err := c.Conn.ExecContext(ctx, formattedQuery)
c.db.afterQuery(ctx, event, res, err)
return res, err
}
func (c Conn) QueryContext(
ctx context.Context, query string, args ...interface{},
) (*sql.Rows, error) {
formattedQuery := c.db.format(query, args)
ctx, event := c.db.beforeQuery(ctx, nil, query, args, formattedQuery, nil)
rows, err := c.Conn.QueryContext(ctx, formattedQuery)
c.db.afterQuery(ctx, event, nil, err)
return rows, err
}
func (c Conn) QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row {
formattedQuery := c.db.format(query, args)
ctx, event := c.db.beforeQuery(ctx, nil, query, args, formattedQuery, nil)
row := c.Conn.QueryRowContext(ctx, formattedQuery)
c.db.afterQuery(ctx, event, nil, row.Err())
return row
}
func (c Conn) Dialect() schema.Dialect {
return c.db.Dialect()
}
func (c Conn) NewValues(model interface{}) *ValuesQuery {
return NewValuesQuery(c.db, model).Conn(c)
}
func (c Conn) NewSelect() *SelectQuery {
return NewSelectQuery(c.db).Conn(c)
}
func (c Conn) NewInsert() *InsertQuery {
return NewInsertQuery(c.db).Conn(c)
}
func (c Conn) NewUpdate() *UpdateQuery {
return NewUpdateQuery(c.db).Conn(c)
}
func (c Conn) NewDelete() *DeleteQuery {
return NewDeleteQuery(c.db).Conn(c)
}
func (c Conn) NewCreateTable() *CreateTableQuery {
return NewCreateTableQuery(c.db).Conn(c)
}
func (c Conn) NewDropTable() *DropTableQuery {
return NewDropTableQuery(c.db).Conn(c)
}
func (c Conn) NewCreateIndex() *CreateIndexQuery {
return NewCreateIndexQuery(c.db).Conn(c)
}
func (c Conn) NewDropIndex() *DropIndexQuery {
return NewDropIndexQuery(c.db).Conn(c)
}
func (c Conn) NewTruncateTable() *TruncateTableQuery {
return NewTruncateTableQuery(c.db).Conn(c)
}
func (c Conn) NewAddColumn() *AddColumnQuery {
return NewAddColumnQuery(c.db).Conn(c)
}
func (c Conn) NewDropColumn() *DropColumnQuery {
return NewDropColumnQuery(c.db).Conn(c)
}
// RunInTx runs the function in a transaction. If the function returns an error,
// the transaction is rolled back. Otherwise, the transaction is committed.
func (c Conn) RunInTx(
ctx context.Context, opts *sql.TxOptions, fn func(ctx context.Context, tx Tx) error,
) error {
tx, err := c.BeginTx(ctx, opts)
if err != nil {
return err
}
var done bool
defer func() {
if !done {
_ = tx.Rollback()
}
}()
if err := fn(ctx, tx); err != nil {
return err
}
done = true
return tx.Commit()
}
func (c Conn) BeginTx(ctx context.Context, opts *sql.TxOptions) (Tx, error) {
ctx, event := c.db.beforeQuery(ctx, nil, "BEGIN", nil, "BEGIN", nil)
tx, err := c.Conn.BeginTx(ctx, opts)
c.db.afterQuery(ctx, event, nil, err)
if err != nil {
return Tx{}, err
}
return Tx{
ctx: ctx,
db: c.db,
Tx: tx,
}, nil
}
//------------------------------------------------------------------------------
type Stmt struct {
*sql.Stmt
}
func (db *DB) Prepare(query string) (Stmt, error) {
return db.PrepareContext(context.Background(), query)
}
func (db *DB) PrepareContext(ctx context.Context, query string) (Stmt, error) {
stmt, err := db.DB.PrepareContext(ctx, query)
if err != nil {
return Stmt{}, err
}
return Stmt{Stmt: stmt}, nil
}
//------------------------------------------------------------------------------
type Tx struct {
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ctx context.Context
db *DB
// name is the name of a savepoint
name string
*sql.Tx
}
// RunInTx runs the function in a transaction. If the function returns an error,
// the transaction is rolled back. Otherwise, the transaction is committed.
func (db *DB) RunInTx(
ctx context.Context, opts *sql.TxOptions, fn func(ctx context.Context, tx Tx) error,
) error {
tx, err := db.BeginTx(ctx, opts)
if err != nil {
return err
}
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var done bool
defer func() {
if !done {
_ = tx.Rollback()
}
}()
if err := fn(ctx, tx); err != nil {
return err
}
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done = true
return tx.Commit()
}
func (db *DB) Begin() (Tx, error) {
return db.BeginTx(context.Background(), nil)
}
func (db *DB) BeginTx(ctx context.Context, opts *sql.TxOptions) (Tx, error) {
ctx, event := db.beforeQuery(ctx, nil, "BEGIN", nil, "BEGIN", nil)
tx, err := db.DB.BeginTx(ctx, opts)
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db.afterQuery(ctx, event, nil, err)
if err != nil {
return Tx{}, err
}
return Tx{
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ctx: ctx,
db: db,
Tx: tx,
}, nil
}
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func (tx Tx) Commit() error {
if tx.name == "" {
return tx.commitTX()
}
return tx.commitSP()
}
func (tx Tx) commitTX() error {
ctx, event := tx.db.beforeQuery(tx.ctx, nil, "COMMIT", nil, "COMMIT", nil)
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err := tx.Tx.Commit()
tx.db.afterQuery(ctx, event, nil, err)
return err
}
func (tx Tx) commitSP() error {
if tx.Dialect().Features().Has(feature.MSSavepoint) {
return nil
}
query := "RELEASE SAVEPOINT " + tx.name
_, err := tx.ExecContext(tx.ctx, query)
return err
}
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func (tx Tx) Rollback() error {
if tx.name == "" {
return tx.rollbackTX()
}
return tx.rollbackSP()
}
func (tx Tx) rollbackTX() error {
ctx, event := tx.db.beforeQuery(tx.ctx, nil, "ROLLBACK", nil, "ROLLBACK", nil)
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err := tx.Tx.Rollback()
tx.db.afterQuery(ctx, event, nil, err)
return err
}
func (tx Tx) rollbackSP() error {
query := "ROLLBACK TO SAVEPOINT " + tx.name
if tx.Dialect().Features().Has(feature.MSSavepoint) {
query = "ROLLBACK TRANSACTION " + tx.name
}
_, err := tx.ExecContext(tx.ctx, query)
return err
}
func (tx Tx) Exec(query string, args ...interface{}) (sql.Result, error) {
return tx.ExecContext(context.TODO(), query, args...)
}
func (tx Tx) ExecContext(
ctx context.Context, query string, args ...interface{},
) (sql.Result, error) {
formattedQuery := tx.db.format(query, args)
ctx, event := tx.db.beforeQuery(ctx, nil, query, args, formattedQuery, nil)
res, err := tx.Tx.ExecContext(ctx, formattedQuery)
tx.db.afterQuery(ctx, event, res, err)
return res, err
}
func (tx Tx) Query(query string, args ...interface{}) (*sql.Rows, error) {
return tx.QueryContext(context.TODO(), query, args...)
}
func (tx Tx) QueryContext(
ctx context.Context, query string, args ...interface{},
) (*sql.Rows, error) {
formattedQuery := tx.db.format(query, args)
ctx, event := tx.db.beforeQuery(ctx, nil, query, args, formattedQuery, nil)
rows, err := tx.Tx.QueryContext(ctx, formattedQuery)
tx.db.afterQuery(ctx, event, nil, err)
return rows, err
}
func (tx Tx) QueryRow(query string, args ...interface{}) *sql.Row {
return tx.QueryRowContext(context.TODO(), query, args...)
}
func (tx Tx) QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row {
formattedQuery := tx.db.format(query, args)
ctx, event := tx.db.beforeQuery(ctx, nil, query, args, formattedQuery, nil)
row := tx.Tx.QueryRowContext(ctx, formattedQuery)
tx.db.afterQuery(ctx, event, nil, row.Err())
return row
}
//------------------------------------------------------------------------------
func (tx Tx) Begin() (Tx, error) {
return tx.BeginTx(tx.ctx, nil)
}
// BeginTx will save a point in the running transaction.
func (tx Tx) BeginTx(ctx context.Context, _ *sql.TxOptions) (Tx, error) {
// mssql savepoint names are limited to 32 characters
sp := make([]byte, 14)
_, err := rand.Read(sp)
if err != nil {
return Tx{}, err
}
qName := "SP_" + hex.EncodeToString(sp)
query := "SAVEPOINT " + qName
if tx.Dialect().Features().Has(feature.MSSavepoint) {
query = "SAVE TRANSACTION " + qName
}
_, err = tx.ExecContext(ctx, query)
if err != nil {
return Tx{}, err
}
return Tx{
ctx: ctx,
db: tx.db,
Tx: tx.Tx,
name: qName,
}, nil
}
func (tx Tx) RunInTx(
ctx context.Context, _ *sql.TxOptions, fn func(ctx context.Context, tx Tx) error,
) error {
sp, err := tx.BeginTx(ctx, nil)
if err != nil {
return err
}
var done bool
defer func() {
if !done {
_ = sp.Rollback()
}
}()
if err := fn(ctx, sp); err != nil {
return err
}
done = true
return sp.Commit()
}
func (tx Tx) Dialect() schema.Dialect {
return tx.db.Dialect()
}
func (tx Tx) NewValues(model interface{}) *ValuesQuery {
return NewValuesQuery(tx.db, model).Conn(tx)
}
func (tx Tx) NewSelect() *SelectQuery {
return NewSelectQuery(tx.db).Conn(tx)
}
func (tx Tx) NewInsert() *InsertQuery {
return NewInsertQuery(tx.db).Conn(tx)
}
func (tx Tx) NewUpdate() *UpdateQuery {
return NewUpdateQuery(tx.db).Conn(tx)
}
func (tx Tx) NewDelete() *DeleteQuery {
return NewDeleteQuery(tx.db).Conn(tx)
}
func (tx Tx) NewCreateTable() *CreateTableQuery {
return NewCreateTableQuery(tx.db).Conn(tx)
}
func (tx Tx) NewDropTable() *DropTableQuery {
return NewDropTableQuery(tx.db).Conn(tx)
}
func (tx Tx) NewCreateIndex() *CreateIndexQuery {
return NewCreateIndexQuery(tx.db).Conn(tx)
}
func (tx Tx) NewDropIndex() *DropIndexQuery {
return NewDropIndexQuery(tx.db).Conn(tx)
}
func (tx Tx) NewTruncateTable() *TruncateTableQuery {
return NewTruncateTableQuery(tx.db).Conn(tx)
}
func (tx Tx) NewAddColumn() *AddColumnQuery {
return NewAddColumnQuery(tx.db).Conn(tx)
}
func (tx Tx) NewDropColumn() *DropColumnQuery {
return NewDropColumnQuery(tx.db).Conn(tx)
}
//------------------------------------------------------------------------------
func (db *DB) makeQueryBytes() []byte {
// TODO: make this configurable?
return make([]byte, 0, 4096)
}