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test: ensure that fill_mempool leaves some room in mempool

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Sebastian Falbesoner 2024-05-23 01:29:08 +02:00 • committed by Larry Ruane
parent 2ec0a28a37
commit 9c89fb4cc1
1 changed files with 12 additions and 3 deletions
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15
test/functional/test_framework/mempool_util.py
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@ -42,16 +42,17 @@ def fill_mempool(test_framework, node):
# Generate UTXOs to flood the mempool
# 1 to create a tx initially that will be evicted from the mempool later
# 75 transactions each with a fee rate higher than the previous one
# 1 to create a final middle-sized tx to evict a filler tx and create room (if needed)
ephemeral_miniwallet = MiniWallet(node, tag_name="fill_mempool_ephemeral_wallet")
test_framework.generate(ephemeral_miniwallet, 1 + num_of_batches * tx_batch_size)
test_framework.generate(ephemeral_miniwallet, 2 + num_of_batches * tx_batch_size)
# Mine enough blocks so that the UTXOs are allowed to be spent
test_framework.generate(node, COINBASE_MATURITY - 1)
# Get all UTXOs up front to ensure none of the transactions spend from each other, as that may
# change their effective feerate and thus the order in which they are selected for eviction.
confirmed_utxos = [ephemeral_miniwallet.get_utxo(confirmed_only=True) for _ in range(num_of_batches * tx_batch_size + 1)]
assert_equal(len(confirmed_utxos), num_of_batches * tx_batch_size + 1)
confirmed_utxos = [ephemeral_miniwallet.get_utxo(confirmed_only=True) for _ in range(num_of_batches * tx_batch_size + 2)]
assert_equal(len(confirmed_utxos), num_of_batches * tx_batch_size + 2)
test_framework.log.debug("Create a mempool tx that will be evicted")
tx_to_be_evicted_id = ephemeral_miniwallet.send_self_transfer(
@ -70,6 +71,14 @@ def fill_mempool(test_framework, node):
create_lots_of_big_transactions(ephemeral_miniwallet, node, fee, tx_batch_size, txouts, utxos)
del confirmed_utxos[:tx_batch_size]
# if mempool is almost full (<10k usage bytes left), submit one extra middle-sized tx,
# in order to evict a large filler tx and leave some room; this will enable tests to submit
# txs with just the mempoolminfee without immediate eviction ("mempool full" error)
if node.getmempoolinfo()['usage'] >= 4_990_000:
ephemeral_miniwallet.send_self_transfer(from_node=node, fee=num_of_batches * (base_fee / 2),
utxo_to_spend=confirmed_utxos.pop(0), target_weight = 32500 * 4)
assert_greater_than(4_990_000, node.getmempoolinfo()['usage'])
test_framework.log.debug("The tx should be evicted by now")
# The number of transactions created should be greater than the ones present in the mempool
assert_greater_than(tx_batch_size * num_of_batches, len(node.getrawmempool()))