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watchtower: convert JusticeKit to interface

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In this commit, we convert the `JusticeKit` struct to an interface.
Then, we add two implementations of that interface:
1) The `legacyJusticeKit` which implements all the methods of
   `JusticeKit`
2) The `anchorJusticKit` which wraps the `legacyJusticeKit` and just
   re-implements the `ToRemoteOutputSpendInfo` method since.
This commit is contained in:
Elle Mouton
2023-08-23 10:51:57 +02:00
parent 048dc54110
commit 154e9fafec
14 changed files with 666 additions and 520 deletions
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14
watchtower/wtmock/tower_db.go
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@@ -37,12 +37,22 @@ func (db *TowerDB) InsertStateUpdate(update *wtdb.SessionStateUpdate) (uint16, e
return 0, wtdb.ErrSessionNotFound
}
commitType, err := info.Policy.BlobType.CommitmentType(nil)
if err != nil {
return 0, err
}
kit, err := commitType.EmptyJusticeKit()
if err != nil {
return 0, err
}
// Assert that the blob is the correct size for the session's blob type.
if len(update.EncryptedBlob) != blob.Size(info.Policy.BlobType) {
if len(update.EncryptedBlob) != blob.Size(kit) {
return 0, wtdb.ErrInvalidBlobSize
}
err := info.AcceptUpdateSequence(update.SeqNum, update.LastApplied)
err = info.AcceptUpdateSequence(update.SeqNum, update.LastApplied)
if err != nil {
return info.LastApplied, err
}