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b5b8602820
This commit removes shadowing of the currentHeight variable when registering for neutrino spend notifications. Currently, a locally scoped variable is used when determining if the backend is fully synced before attempting to call GetUtxo, which means that the variable won't be updated after breaking out of the loop. As a result, this could cause us to scan unnecessarily if the backend is catching up, e.g. after being offline for some time.
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