[qa] Update compactblocks test for multi-peer reconstruction

qa/rpc-tests/p2p-compactblocks.py

@@ -764,6 +764,54 @@ class CompactBlocksTest(BitcoinTestFramework):
         msg.announce = True
         peer.send_and_ping(msg)
 
+    def test_compactblock_reconstruction_multiple_peers(self, node, stalling_peer, delivery_peer):
+        assert(len(self.utxos))
+
+        def announce_cmpct_block(node, peer):
+            utxo = self.utxos.pop(0)
+            block = self.build_block_with_transactions(node, utxo, 5)
+
+            cmpct_block = HeaderAndShortIDs()
+            cmpct_block.initialize_from_block(block)
+            msg = msg_cmpctblock(cmpct_block.to_p2p())
+            peer.send_and_ping(msg)
+            with mininode_lock:
+                assert(peer.last_getblocktxn is not None)
+            return block, cmpct_block
+
+        block, cmpct_block = announce_cmpct_block(node, stalling_peer)
+
+        for tx in block.vtx[1:]:
+            delivery_peer.send_message(msg_tx(tx))
+        delivery_peer.sync_with_ping()
+        mempool = node.getrawmempool()
+        for tx in block.vtx[1:]:
+            assert(tx.hash in mempool)
+
+        delivery_peer.send_and_ping(msg_cmpctblock(cmpct_block.to_p2p()))
+        assert_equal(int(node.getbestblockhash(), 16), block.sha256)
+
+        self.utxos.append([block.vtx[-1].sha256, 0, block.vtx[-1].vout[0].nValue])
+
+        # Now test that delivering an invalid compact block won't break relay
+
+        block, cmpct_block = announce_cmpct_block(node, stalling_peer)
+        for tx in block.vtx[1:]:
+            delivery_peer.send_message(msg_tx(tx))
+        delivery_peer.sync_with_ping()
+
+        cmpct_block.prefilled_txn[0].tx.wit.vtxinwit = [ CTxInWitness() ]
+        cmpct_block.prefilled_txn[0].tx.wit.vtxinwit[0].scriptWitness.stack = [ser_uint256(0)]
+
+        cmpct_block.use_witness = True
+        delivery_peer.send_and_ping(msg_cmpctblock(cmpct_block.to_p2p()))
+        assert(int(node.getbestblockhash(), 16) != block.sha256)
+
+        msg = msg_blocktxn()
+        msg.block_transactions.blockhash = block.sha256
+        msg.block_transactions.transactions = block.vtx[1:]
+        stalling_peer.send_and_ping(msg)
+        assert_equal(int(node.getbestblockhash(), 16), block.sha256)
 
     def run_test(self):
         # Setup the p2p connections and start up the network thread.
@@ -848,6 +896,10 @@ class CompactBlocksTest(BitcoinTestFramework):
         self.test_invalid_tx_in_compactblock(self.nodes[1], self.segwit_node, False)
         self.test_invalid_tx_in_compactblock(self.nodes[1], self.old_node, False)
 
+        print("\tTesting reconstructing compact blocks from all peers...")
+        self.test_compactblock_reconstruction_multiple_peers(self.nodes[1], self.segwit_node, self.old_node)
+        sync_blocks(self.nodes)
+
         # Advance to segwit activation
         print ("\nAdvancing to segwit activation\n")
         self.activate_segwit(self.nodes[1])