Method test_sequence

test/functional/interface_zmq.py:296–442

Sequence zmq notifications give every blockhash and txhash in order of processing, regardless of IBD, re-orgs, etc. Format of messages: <32-byte hash>C : Blockhash connected <32-byte hash>D : Blockhash disconnected <32-

(self)

        assert_equal(hashtx.receive().hex(), self.nodes[1].getblock(connect_blocks[0])["tx"][0])

    def test_sequence(self):
        """
        Sequence zmq notifications give every blockhash and txhash in order
        of processing, regardless of IBD, re-orgs, etc.
        Format of messages:
        <32-byte hash>C :                 Blockhash connected
        <32-byte hash>D :                 Blockhash disconnected
        <32-byte hash>R<8-byte LE uint> : Transactionhash removed from mempool for non-block inclusion reason
        <32-byte hash>A<8-byte LE uint> : Transactionhash added mempool
        """
        self.log.info("Testing 'sequence' publisher")
        [seq] = self.setup_zmq_test([("sequence", "tcp://127.0.0.1:28333")])
        self.disconnect_nodes(0, 1)

        # Mempool sequence number starts at 1
        seq_num = 1

        # Generate 1 block in nodes[0] and receive all notifications
        dc_block = self.generatetoaddress(self.nodes[0], 1, ADDRESS_BCRT1_UNSPENDABLE, sync_fun=self.no_op)[0]

        # Note: We are not notified of any block transactions, coinbase or mined
        assert_equal((self.nodes[0].getbestblockhash(), "C", None), seq.receive_sequence())

        # Generate 2 blocks in nodes[1] to a different address to ensure a chain split
        self.generatetoaddress(self.nodes[1], 2, ADDRESS_BCRT1_P2WSH_OP_TRUE, sync_fun=self.no_op)

        # nodes[0] will reorg chain after connecting back nodes[1]
        self.connect_nodes(0, 1)

        # Then we receive all block (dis)connect notifications for the 2 block reorg
        assert_equal((dc_block, "D", None), seq.receive_sequence())
        block_count = self.nodes[1].getblockcount()
        assert_equal((self.nodes[1].getblockhash(block_count-1), "C", None), seq.receive_sequence())
        assert_equal((self.nodes[1].getblockhash(block_count), "C", None), seq.receive_sequence())

        # Rest of test requires wallet functionality
        if self.is_wallet_compiled():
            self.log.info("Wait for tx from second node")
            payment_txid = self.nodes[1].sendtoaddress(address=self.nodes[0].getnewaddress(), amount=5.0, replaceable=True)
            self.sync_all()
            self.log.info("Testing sequence notifications with mempool sequence values")

            # Should receive the broadcasted txid.
            assert_equal((payment_txid, "A", seq_num), seq.receive_sequence())
            seq_num += 1

            self.log.info("Testing RBF notification")
            # Replace it to test eviction/addition notification
            rbf_info = self.nodes[1].bumpfee(payment_txid)
            self.sync_all()
            assert_equal((payment_txid, "R", seq_num), seq.receive_sequence())
            seq_num += 1
            assert_equal((rbf_info["txid"], "A", seq_num), seq.receive_sequence())
            seq_num += 1

            # Doesn't get published when mined, make a block and tx to "flush" the possibility
            # though the mempool sequence number does go up by the number of transactions
            # removed from the mempool by the block mining it.