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bugfix: Fix a race condition when creating guest accounts (#882)

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* bugfix: Fix a race condition when creating guest accounts

It was possible to both select the same next numeric ID and then both
attempt to INSERT this into the table. This would cause a UNIQUE violation
which then presented itself as an error in sqlite because it does not
implement `common.IsUniqueConstraintViolationErr`.

The fix here is NOT to implement `common.IsUniqueConstraintViolationErr`
otherwise the 2 users would get the SAME guest account. Instead, all of
these operations should be done inside a transaction. This is what this
PR does.

* Update postgres

* Typo

* Actually use the txn when creating accounts

* bugfix for database is locked on guest reg
This commit is contained in:
Kegsay 2020-03-06 18:00:07 +00:00 • committed by GitHub
parent 6a1111c3d4
commit c31cb02271
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10 changed files with 108 additions and 40 deletions
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clientapi/auth/storage/accounts/interface.go
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@ -30,6 +30,7 @@ type Database interface {
SetAvatarURL(ctx context.Context, localpart string, avatarURL string) error
SetDisplayName(ctx context.Context, localpart string, displayName string) error
CreateAccount(ctx context.Context, localpart, plaintextPassword, appserviceID string) (*authtypes.Account, error)
CreateGuestAccount(ctx context.Context) (*authtypes.Account, error)
UpdateMemberships(ctx context.Context, eventsToAdd []gomatrixserverlib.Event, idsToRemove []string) error
GetMembershipInRoomByLocalpart(ctx context.Context, localpart, roomID string) (authtypes.Membership, error)
GetMembershipsByLocalpart(ctx context.Context, localpart string) (memberships []authtypes.Membership, err error)