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e6b1a27cd7
In this commit, we modify the notifier to handle filter updates synchronously. We do this to prevent race conditions between new block notifications and filter updates. Otherwise, it's possible for a new block to come in that should match our filter, but doesn't due to the filter being updated after. We also modify their order so that the filter is updated first. We do this so we can immediately start watching for the event at tip while the rescan is ongoing.
chainntnfs
The chainntnfs package implements a set of interfaces which allow callers to receive notifications in response to specific on-chain events. The set of notifications available include:
- Notifications for each new block connected to the current best chain.
- Notifications once a
txidhas reached a specified number of confirmations. - Notifications once a target outpoint (
txid:index) has been spent.
These notifications are used within lnd in order to properly handle the
workflows for: channel funding, cooperative channel closures, forced channel
closures, channel contract breaches, sweeping time-locked outputs, and finally
pruning the channel graph.
This package is intentionally general enough to be applicable outside the
specific use cases within lnd outlined above. The current sole concrete
implementation of the ChainNotifier interface depends on btcd.
Installation and Updating
$ go get -u github.com/lightningnetwork/lnd/chainntnfs