Fix misuse of TxContext (#30061)

Help #29999, or its tests cannot pass.

Also, add some comments to clarify the usage of `TxContext`.

I don't check all usages of `TxContext` because there are too many
(almost 140+). It's a better idea to replace them with `WithTx` instead
of checking them one by one. However, that may be another refactoring
PR.

(cherry picked from commit c6c4d66004c70b24abc8048b39b660b8361a0395)
This commit is contained in:
Jason Song 2024-03-25 15:00:16 +08:00 committed by Earl Warren
parent 8e3e31a566
commit 2c4e85421e
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2 changed files with 11 additions and 1 deletions

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@ -120,6 +120,16 @@ func (c *halfCommitter) Close() error {
// TxContext represents a transaction Context,
// it will reuse the existing transaction in the parent context or create a new one.
// Some tips to use:
//
// 1 It's always recommended to use `WithTx` in new code instead of `TxContext`, since `WithTx` will handle the transaction automatically.
// 2. To maintain the old code which uses `TxContext`:
// a. Always call `Close()` before returning regardless of whether `Commit()` has been called.
// b. Always call `Commit()` before returning if there are no errors, even if the code did not change any data.
// c. Remember the `Committer` will be a halfCommitter when a transaction is being reused.
// So calling `Commit()` will do nothing, but calling `Close()` without calling `Commit()` will rollback the transaction.
// And all operations submitted by the caller stack will be rollbacked as well, not only the operations in the current function.
// d. It doesn't mean rollback is forbidden, but always do it only when there is an error, and you do want to rollback.
func TxContext(parentCtx context.Context) (*Context, Committer, error) {
if sess, ok := inTransaction(parentCtx); ok {
return newContext(parentCtx, sess, true), &halfCommitter{committer: sess}, nil

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@ -620,7 +620,7 @@ func AddReviewRequest(ctx context.Context, issue *Issue, reviewer, doer *user_mo
// skip it when reviewer hase been request to review
if review != nil && review.Type == ReviewTypeRequest {
return nil, nil
return nil, committer.Commit() // still commit the transaction, or committer.Close() will rollback it, even if it's a reused transaction.
}
// if the reviewer is an official reviewer,