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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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12
watchtower/wtdb/tower_db.go
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@@ -240,9 +240,19 @@ func (t *TowerDB) InsertStateUpdate(update *SessionStateUpdate) (uint16, error)
return err
}
commitType, err := session.Policy.BlobType.CommitmentType(nil)
if err != nil {
return err
}
kit, err := commitType.EmptyJusticeKit()
if err != nil {
return err
}
// Assert that the blob is the correct size for the session's
// blob type.
expBlobSize := blob.Size(session.Policy.BlobType)
expBlobSize := blob.Size(kit)
if len(update.EncryptedBlob) != expBlobSize {
return ErrInvalidBlobSize
}