Go transaction manager
Transaction manager is an abstraction to coordinate database transaction boundaries.
Easiest way to get the perfect repository.
Supported implementations
- database/sql, docs (Go 1.13)
- jmoiron/sqlx, docs (Go 1.13)
- gorm, docs (Go 1.16)
- mongo-go-driver, docs (Go 1.13)
- go-redis/redis, docs (Go 1.17)
- pgx_v4, docs (Go 1.16)
- pgx_v5, docs (Go 1.19)
Installation
go get github.com/avito-tech/go-transaction-manager
Backwards Compatibility
The library is compatible with the most recent two versions of Go. Compatibility beyond that is not guaranteed.
Usage
To use multiple transactions from different databases, you need to set CtxKey in Settings by WithCtxKey.
For nested transactions with different transaction managers, you need to use ChainedMW (docs).
To skip a transaction rollback due to an error, use ErrSkip or Skippable
English, Russian)
Explanation of the approach (Examples with an ideal repository and nested transactions.
Below is an example how to start usage.
package main
import (
"context"
"fmt"
"github.com/jmoiron/sqlx"
_ "github.com/mattn/go-sqlite3"
trmsqlx "github.com/avito-tech/go-transaction-manager/sqlx"
"github.com/avito-tech/go-transaction-manager/trm/manager"
)
func main() {
db, err := sqlx.Open("sqlite3", "file:test?mode=memory")
checkErr(err)
defer db.Close()
sqlStmt := `CREATE TABLE IF NOT EXISTS user (user_id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, username TEXT);`
_, err = db.Exec(sqlStmt)
checkErr(err, sqlStmt)
r := newRepo(db, trmsqlx.DefaultCtxGetter)
ctx := context.Background()
trManager := manager.Must(trmsqlx.NewDefaultFactory(db))
u := &user{Username: "username"}
err = trManager.Do(ctx, func(ctx context.Context) error {
checkErr(r.Save(ctx, u))
return trManager.Do(ctx, func(ctx context.Context) error {
u.Username = "new_username"
return r.Save(ctx, u)
})
})
checkErr(err)
userFromDB, err := r.GetByID(ctx, u.ID)
checkErr(err)
fmt.Println(userFromDB)
}
func checkErr(err error, args ...interface{}) {
if err != nil {
panic(fmt.Sprint(append([]interface{}{err}, args...)...))
}
}
type repo struct {
db *sqlx.DB
getter *trmsqlx.CtxGetter
}
func newRepo(db *sqlx.DB, c *trmsqlx.CtxGetter) *repo {
return &repo{db: db, getter: c}
}
type user struct {
ID int64 `db:"user_id"`
Username string `db:"username"`
}
func (r *repo) GetByID(ctx context.Context, id int64) (*user, error) {
query := "SELECT * FROM user WHERE user_id = ?;"
u := user{}
return &u, r.getter.DefaultTrOrDB(ctx, r.db).GetContext(ctx, &u, r.db.Rebind(query), id)
}
func (r *repo) Save(ctx context.Context, u *user) error {
query := `UPDATE user SET username = :username WHERE user_id = :user_id;`
if u.ID == 0 {
query = `INSERT INTO user (username) VALUES (:username);`
}
res, err := sqlx.NamedExecContext(ctx, r.getter.DefaultTrOrDB(ctx, r.db), r.db.Rebind(query), u)
if err != nil {
return err
} else if u.ID != 0 {
return nil
} else if u.ID, err = res.LastInsertId(); err != nil {
return err
}
return err
}
Benchmark
Comparing examples with and without trm.