github.com/ecodeclub/eorm@v0.0.2-0.20231001112437-dae71da914d0/internal/datasource/transaction/delay_transaction.go (about)

     1  // Copyright 2021 ecodeclub
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  // http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package transaction
    16  
    17  import (
    18  	"context"
    19  	"database/sql"
    20  	"fmt"
    21  	"sync"
    22  
    23  	"github.com/ecodeclub/eorm/internal/datasource"
    24  	"go.uber.org/multierr"
    25  )
    26  
    27  type DelayTxFactory struct{}
    28  
    29  func (DelayTxFactory) TxOf(ctx Context, finder datasource.Finder) (datasource.Tx, error) {
    30  	return NewDelayTx(ctx, finder), nil
    31  }
    32  
    33  type DelayTx struct {
    34  	ctx    Context
    35  	lock   sync.RWMutex
    36  	txs    map[string]datasource.Tx
    37  	finder datasource.Finder
    38  }
    39  
    40  func (t *DelayTx) findTgt(ctx context.Context, query datasource.Query) (datasource.TxBeginner, error) {
    41  	return t.finder.FindTgt(ctx, query)
    42  }
    43  
    44  func (t *DelayTx) findOrBeginTx(ctx context.Context, query datasource.Query) (datasource.Tx, error) {
    45  	t.lock.RLock()
    46  	tx, ok := t.txs[query.DB]
    47  	t.lock.RUnlock()
    48  	if ok {
    49  		return tx, nil
    50  	}
    51  	t.lock.Lock()
    52  	defer t.lock.Unlock()
    53  	if tx, ok = t.txs[query.DB]; ok {
    54  		return tx, nil
    55  	}
    56  	var err error
    57  	db, err := t.findTgt(ctx, query)
    58  	if err != nil {
    59  		return nil, err
    60  	}
    61  	tx, err = db.BeginTx(t.ctx.TxCtx, t.ctx.Opts)
    62  	if err != nil {
    63  		return nil, err
    64  	}
    65  	t.txs[query.DB] = tx
    66  	return tx, nil
    67  }
    68  
    69  func (t *DelayTx) Query(ctx context.Context, query datasource.Query) (*sql.Rows, error) {
    70  	// 防止 GetMulti 的查询重复创建多个事务
    71  	tx, err := t.findOrBeginTx(ctx, query)
    72  	if err != nil {
    73  		return nil, err
    74  	}
    75  	return tx.Query(ctx, query)
    76  }
    77  
    78  func (t *DelayTx) Exec(ctx context.Context, query datasource.Query) (sql.Result, error) {
    79  	tx, err := t.findOrBeginTx(ctx, query)
    80  	if err != nil {
    81  		return nil, err
    82  	}
    83  	return tx.Exec(ctx, query)
    84  }
    85  
    86  func (t *DelayTx) Commit() error {
    87  	var err error
    88  	for name, tx := range t.txs {
    89  		if er := tx.Commit(); er != nil {
    90  			err = multierr.Combine(
    91  				err, fmt.Errorf("masterslave DB name [%s] Commit error: %w", name, er))
    92  		}
    93  	}
    94  	return err
    95  }
    96  
    97  func (t *DelayTx) Rollback() error {
    98  	var err error
    99  	for name, tx := range t.txs {
   100  		if er := tx.Rollback(); er != nil {
   101  			err = multierr.Combine(
   102  				err, fmt.Errorf("masterslave DB name [%s] Rollback error: %w", name, er))
   103  		}
   104  	}
   105  	return err
   106  }
   107  
   108  func NewDelayTx(ctx Context, finder datasource.Finder) *DelayTx {
   109  	return &DelayTx{
   110  		ctx:    ctx,
   111  		finder: finder,
   112  		txs:    make(map[string]datasource.Tx, 8),
   113  	}
   114  }