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72 lines
3 KiB
Go
72 lines
3 KiB
Go
package itest
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import (
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"time"
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"github.com/btcsuite/btcd/btcutil"
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"github.com/lightningnetwork/lnd/lntest"
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"github.com/lightningnetwork/lnd/lntest/node"
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)
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// flakePreimageSettlement documents a flake found when testing the preimage
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// extraction logic in a force close. The scenario is,
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// - Alice and Bob have a channel.
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// - Alice sends an HTLC to Bob, and Bob won't settle it.
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// - Alice goes offline.
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// - Bob force closes the channel and claims the HTLC using the preimage using
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// a sweeping tx.
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//
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// TODO(yy): Expose blockbeat to the link layer so the preimage extraction
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// happens in the same block where it's spent.
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func flakePreimageSettlement(ht *lntest.HarnessTest) {
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// Mine a block to trigger the sweep. This is needed because the
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// preimage extraction logic from the link is not managed by the
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// blockbeat, which means the preimage may be sent to the contest
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// resolver after it's launched, which means Bob would miss the block to
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// launch the resolver.
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ht.MineEmptyBlocks(1)
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// Sleep for 2 seconds, which is needed to make sure the mempool has the
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// correct tx. The above mined block can cause an RBF, if the preimage
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// extraction has already been finished before the block is mined. This
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// means Bob would have created the sweeping tx - mining another block
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// would cause the sweeper to RBF it.
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time.Sleep(2 * time.Second)
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}
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// flakeFundExtraUTXO documents a flake found when testing the sweeping behavior
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// of the given node, which would fail due to no wallet UTXO available, while
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// there should be enough.
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//
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// TODO(yy): remove it once the issue is resolved.
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func flakeFundExtraUTXO(ht *lntest.HarnessTest, node *node.HarnessNode) {
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// The node should have enough wallet UTXOs here to sweep the HTLC in
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// the end of this test. However, due to a known issue, the node's
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// wallet may report there's no UTXO available. For details,
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// - https://github.com/lightningnetwork/lnd/issues/8786
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ht.FundCoins(btcutil.SatoshiPerBitcoin, node)
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}
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// flakeTxNotifierNeutrino documents a flake found when running force close
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// tests using neutrino backend, which is a race between two notifications - one
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// for the spending notification, the other for the block which contains the
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// spending tx.
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//
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// TODO(yy): remove it once the issue is resolved.
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func flakeTxNotifierNeutrino(ht *lntest.HarnessTest) {
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// Mine an empty block the for neutrino backend. We need this step to
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// trigger Bob's chain watcher to detect the force close tx. Deep down,
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// this happens because the notification system for neutrino is very
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// different from others. Specifically, when a block contains the force
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// close tx is notified, these two calls,
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// - RegisterBlockEpochNtfn, will notify the block first.
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// - RegisterSpendNtfn, will wait for the neutrino notifier to sync to
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// the block, then perform a GetUtxo, which, by the time the spend
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// details are sent, the blockbeat is considered processed in Bob's
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// chain watcher.
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//
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// TODO(yy): refactor txNotifier to fix the above issue.
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if ht.IsNeutrinoBackend() {
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ht.MineEmptyBlocks(1)
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}
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}
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