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doc: Document the newly added commitment_revocation hook

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Christian Decker 2020-05-07 10:25:27 +09:30 • committed by Rusty Russell
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doc/PLUGINS.md
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@ -604,6 +604,45 @@ there's a member `error_message`, that member is sent to the peer
before disconnection.
### `commitment_revocation`
This hook is called whenever a channel state is updated, and the old state was
revoked. State updates in Lightning consist of the following steps:
1. Proposal of a new state commitment in the form of a commitment transaction
2. Exchange of signatures for the agreed upon commitment transaction
3. Verification that the signatures match the commitment transaction
4. Exchange of revocation secrets that could be used to penalize an eventual misbehaving party
The `commitment_revocation` hook is used to inform the plugin about the state
transition being completed, and deliver the penalty transaction. The penalty
transaction could then be sent to a watchtower that automaticaly reacts in
case one party attempts to settle using a revoked commitment.
The payload consists of the following information:
```json
{
"commitment_txid": "58eea2cf538cfed79f4d6b809b920b40bb6b35962c4bb4cc81f5550a7728ab05",
"penalty_tx": "02000000000101...ac00000000"
}
```
Notice that the `commitment_txid` could also be extracted from the sole input
of the `penalty_tx`, however it is enclosed so plugins don't have to include
the logic to parse transactions.
Not included are the `htlc_success` and `htlc_failure` transactions that
may also be spending `commitment_tx` outputs. This is because these
transactions are much more dynamic and have a predictable timeout, allowing
wallets to ensure a quick checkin when the CLTV of the HTLC is about to
expire.
The `commitment_revocation` hook is a chained hook, i.e., multiple plugins can
register it, and they will be called in the order they were registered in.
Plugins should always return `{"result": "continue"}`, otherwise subsequent
hook subscribers would not get called.
### `db_write`
This hook is called whenever a change is about to be committed to the database.