52db5ed682
In this commit, we extend the NeutrinoNotifier to support registering scripts for spends notifications. Once the script has been detected as spent within the chain, a spend notification will be dispatched through the Spend channel of the SpendEvent returned upon registration. For scripts that have been spent in the past, the rescan logic has been modified to match on the script rather than the outpoint. A concurrent queue for relevant transactions has been added to proxy notifications from the underlying rescan to the txNotifier. This is needed for scripts, as we cannot perform a historical rescan for scripts through `GetUtxo`, like we do with outpoints. For scripts that are unspent, a filter update is sent to the underlying rescan to ensure that we match and dispatch on the script when processing new blocks. Along the way, we also address an issue where we'd miss detecting that an outpoint/script has been spent in the future due to not receiving a historical dispatch request from the underlying txNotifier. To fix this, we ensure that we always request the backend to notify us of the spend once it detects it at tip, regardless of whether a historical rescan was detected or not. |
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|---|---|---|
| .. | ||
| bitcoindnotify | ||
| btcdnotify | ||
| neutrinonotify | ||
| height_hint_cache_test.go | ||
| height_hint_cache.go | ||
| interface_dev.go | ||
| interface_test.go | ||
| interface.go | ||
| log.go | ||
| README.md | ||
| test_utils.go | ||
| txnotifier_test.go | ||
| txnotifier.go | ||
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