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Idiomatic, simple, defer-based rollback mechanism https://play.golang.org/p/p28rpnpiUcL
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package main | |
import ( | |
"errors" | |
"log" | |
) | |
// rollback function | |
func rollback(rollbackCtrl *bool, rollbackFunc func()) { | |
if *rollbackCtrl { | |
rollbackFunc() | |
} | |
} | |
// successful action | |
func action1() (string, error) { | |
return "action 1", nil | |
} | |
// successful action | |
func action2() (string, error) { | |
return "action 2", nil | |
} | |
// failed action | |
func action3() (string, error) { | |
return "", errors.New("error: action 3") | |
} | |
func main() { | |
rollbackCtrl := false | |
res1, err := action1() | |
// handle error idiomatically | |
if err != nil { | |
// mark rollback | |
rollbackCtrl = true | |
log.Print(err.Error()) | |
return | |
} | |
// defer the rollback execution | |
defer rollback(&rollbackCtrl, func() { | |
log.Print("rollback: action 1") | |
}) | |
log.Print(res1) | |
res2, err := action2() | |
if err != nil { | |
// mark rollback | |
rollbackCtrl = true | |
log.Print(err.Error()) | |
return | |
} | |
defer rollback(&rollbackCtrl, func() { | |
log.Print("rollback: action 2") | |
}) | |
log.Print(res2) | |
res3, err := action3() | |
if err != nil { | |
// mark rollback | |
rollbackCtrl = true | |
log.Print(err.Error()) | |
return | |
} | |
defer rollback(&rollbackCtrl, func() { | |
log.Print("rollback: action 3") | |
}) | |
log.Print(res3) | |
} |
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