1 files changed, 166 insertions, 0 deletions
diff --git a/test/functional/p2p_1p1c_network.py b/test/functional/p2p_1p1c_network.py
new file mode 100755
index 0000000000..ea59248506
--- /dev/null
+++ b/test/functional/p2p_1p1c_network.py
@@ -0,0 +1,166 @@
+#!/usr/bin/env python3
+# Copyright (c) 2024-present The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""
+Test that 1p1c package submission allows a 1p1c package to propagate in a "network" of nodes. Send
+various packages from different nodes on a network in which some nodes have already received some of
+the transactions (and submitted them to mempool, kept them as orphans or rejected them as
+too-low-feerate transactions). The packages should be received and accepted by all nodes.
+"""
+
+from decimal import Decimal
+from math import ceil
+
+from test_framework.mempool_util import (
+    fill_mempool,
+)
+from test_framework.messages import (
+    msg_tx,
+)
+from test_framework.p2p import (
+    P2PInterface,
+)
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import (
+    assert_equal,
+    assert_greater_than,
+)
+from test_framework.wallet import (
+    MiniWallet,
+    MiniWalletMode,
+)
+
+# 1sat/vB feerate denominated in BTC/KvB
+FEERATE_1SAT_VB = Decimal("0.00001000")
+
+class PackageRelayTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.setup_clean_chain = True
+        self.num_nodes = 4
+        # hugely speeds up the test, as it involves multiple hops of tx relay.
+        self.noban_tx_relay = True
+        self.extra_args = [[
+            "-datacarriersize=100000",
+            "-maxmempool=5",
+        ]] * self.num_nodes
+        self.supports_cli = False
+
+    def raise_network_minfee(self):
+        fill_mempool(self, self.nodes[0])
+
+        self.log.debug("Wait for the network to sync mempools")
+        self.sync_mempools()
+
+        self.log.debug("Check that all nodes' mempool minimum feerates are above min relay feerate")
+        for node in self.nodes:
+            assert_equal(node.getmempoolinfo()['minrelaytxfee'], FEERATE_1SAT_VB)
+            assert_greater_than(node.getmempoolinfo()['mempoolminfee'], FEERATE_1SAT_VB)
+
+    def create_basic_1p1c(self, wallet):
+        low_fee_parent = wallet.create_self_transfer(fee_rate=FEERATE_1SAT_VB, confirmed_only=True)
+        high_fee_child = wallet.create_self_transfer(utxo_to_spend=low_fee_parent["new_utxo"], fee_rate=999*FEERATE_1SAT_VB)
+        package_hex_basic = [low_fee_parent["hex"], high_fee_child["hex"]]
+        return package_hex_basic, low_fee_parent["tx"], high_fee_child["tx"]
+
+    def create_package_2outs(self, wallet):
+        # First create a tester tx to see the vsize, and then adjust the fees
+        utxo_for_2outs = wallet.get_utxo(confirmed_only=True)
+
+        low_fee_parent_2outs_tester = wallet.create_self_transfer_multi(
+            utxos_to_spend=[utxo_for_2outs],
+            num_outputs=2,
+        )
+
+        # Target 1sat/vB so the number of satoshis is equal to the vsize.
+        # Round up. The goal is to be between min relay feerate and mempool min feerate.
+        fee_2outs = ceil(low_fee_parent_2outs_tester["tx"].get_vsize() / 2)
+
+        low_fee_parent_2outs = wallet.create_self_transfer_multi(
+            utxos_to_spend=[utxo_for_2outs],
+            num_outputs=2,
+            fee_per_output=fee_2outs,
+        )
+
+        # Now create the child
+        high_fee_child_2outs = wallet.create_self_transfer_multi(
+            utxos_to_spend=low_fee_parent_2outs["new_utxos"][::-1],
+            fee_per_output=fee_2outs*100,
+        )
+        return [low_fee_parent_2outs["hex"], high_fee_child_2outs["hex"]], low_fee_parent_2outs["tx"], high_fee_child_2outs["tx"]
+
+    def create_package_2p1c(self, wallet):
+        parent1 = wallet.create_self_transfer(fee_rate=FEERATE_1SAT_VB*10, confirmed_only=True)
+        parent2 = wallet.create_self_transfer(fee_rate=FEERATE_1SAT_VB*20, confirmed_only=True)
+        child = wallet.create_self_transfer_multi(
+            utxos_to_spend=[parent1["new_utxo"], parent2["new_utxo"]],
+            fee_per_output=999*parent1["tx"].get_vsize(),
+        )
+        return [parent1["hex"], parent2["hex"], child["hex"]], parent1["tx"], parent2["tx"], child["tx"]
+
+    def create_packages(self):
+        # 1: Basic 1-parent-1-child package, parent 1sat/vB, child 999sat/vB
+        package_hex_1, parent_1, child_1 = self.create_basic_1p1c(self.wallet)
+
+        # 2: same as 1, parent's txid is the same as its wtxid.
+        package_hex_2, parent_2, child_2 = self.create_basic_1p1c(self.wallet_nonsegwit)
+
+        # 3: 2-parent-1-child package. Both parents are above mempool min feerate. No package submission happens.
+        # We require packages to be child-with-unconfirmed-parents and only allow 1-parent-1-child packages.
+        package_hex_3, parent_31, parent_32, child_3 = self.create_package_2p1c(self.wallet)
+
+        # 4: parent + child package where the child spends 2 different outputs from the parent.
+        package_hex_4, parent_4, child_4 = self.create_package_2outs(self.wallet)
+
+        # Assemble return results
+        packages_to_submit = [package_hex_1, package_hex_2, package_hex_3, package_hex_4]
+        # node0: sender
+        # node1: pre-received the children (orphan)
+        # node3: pre-received the parents (too low fee)
+        # All nodes receive parent_31 ahead of time.
+        txns_to_send = [
+            [],
+            [child_1, child_2, parent_31, child_3, child_4],
+            [parent_31],
+            [parent_1, parent_2, parent_31, parent_4]
+        ]
+
+        return packages_to_submit, txns_to_send
+
+    def run_test(self):
+        self.wallet = MiniWallet(self.nodes[1])
+        self.wallet_nonsegwit = MiniWallet(self.nodes[2], mode=MiniWalletMode.RAW_P2PK)
+        self.generate(self.wallet_nonsegwit, 10)
+        self.generate(self.wallet, 120)
+
+        self.log.info("Fill mempools with large transactions to raise mempool minimum feerates")
+        self.raise_network_minfee()
+
+        # Create the transactions.
+        self.wallet.rescan_utxos(include_mempool=True)
+        packages_to_submit, transactions_to_presend = self.create_packages()
+
+        self.peers = [self.nodes[i].add_p2p_connection(P2PInterface()) for i in range(self.num_nodes)]
+
+        self.log.info("Pre-send some transactions to nodes")
+        for (i, peer) in enumerate(self.peers):
+            for tx in transactions_to_presend[i]:
+                peer.send_and_ping(msg_tx(tx))
+            # This disconnect removes any sent orphans from the orphanage (EraseForPeer) and times
+            # out the in-flight requests.  It is currently required for the test to pass right now,
+            # because the node will not reconsider an orphan tx and will not (re)try requesting
+            # orphan parents from multiple peers if the first one didn't respond.
+            # TODO: remove this in the future if the node tries orphan resolution with multiple peers.
+            peer.peer_disconnect()
+
+        self.log.info("Submit full packages to node0")
+        for package_hex in packages_to_submit:
+            submitpackage_result = self.nodes[0].submitpackage(package_hex)
+            assert_equal(submitpackage_result["package_msg"], "success")
+
+        self.log.info("Wait for mempools to sync")
+        self.sync_mempools(timeout=20)
+
+
+if __name__ == '__main__':
+    PackageRelayTest().main()