dash/test/functional/rpc_blockchain.py

#!/usr/bin/env python3
# Copyright (c) 2014-2020 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 RPCs related to blockchainstate.

Test the following RPCs:
    - getblockchaininfo
    - getchaintxstats
    - gettxoutsetinfo
    - getblockheader
    - getblockheaders
    - getdifficulty
    - getnetworkhashps
    - waitforblockheight
    - getblock
    - getblockhash
    - getbestblockhash
    - verifychain

Tests correspond to code in rpc/blockchain.cpp.
"""

from decimal import Decimal
import http.client
import os
import subprocess

from test_framework.address import ADDRESS_BCRT1_P2SH_OP_TRUE
from test_framework.blocktools import (
    MAX_FUTURE_BLOCK_TIME,
    TIME_GENESIS_BLOCK,
    create_block,
    create_coinbase,
)
from test_framework.governance import EXPECTED_STDERR_NO_GOV_PRUNE
from test_framework.messages import (
    CBlockHeader,
    from_hex,
    msg_block,
)
from test_framework.p2p import P2PInterface
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
    assert_equal,
    assert_greater_than,
    assert_greater_than_or_equal,
    assert_raises,
    assert_raises_rpc_error,
    assert_is_hex_string,
    assert_is_hash_string,
    get_datadir_path,
)
from test_framework.wallet import MiniWallet


HEIGHT = 200  # blocks mined
TIME_RANGE_STEP = 156  # two and a half minute steps
TIME_RANGE_MTP = TIME_GENESIS_BLOCK + (HEIGHT - 6) * TIME_RANGE_STEP
TIME_RANGE_TIP = TIME_GENESIS_BLOCK + (HEIGHT - 1) * TIME_RANGE_STEP
TIME_RANGE_END = TIME_GENESIS_BLOCK + HEIGHT * TIME_RANGE_STEP


class BlockchainTest(BitcoinTestFramework):
    def set_test_params(self):
        self.disable_mocktime = True
        self.setup_clean_chain = True
        self.num_nodes = 1
        self.supports_cli = False

    def run_test(self):
        self.mine_chain()
        self._test_max_future_block_time()
        self.restart_node(0, extra_args=['-stopatheight=207', '-prune=1', '-txindex=0'])  # Set extra args with pruning after rescan is complete

        # Actual tests
        self._test_getblockchaininfo()
        self._test_getchaintxstats()
        self._test_gettxoutsetinfo()
        self._test_getblockheader(rpc_name='getblockheader')
        self._test_getblockheader(rpc_name='getblockheaders')
        self._test_getdifficulty()
        self._test_getnetworkhashps()
        self._test_stopatheight()
        self._test_waitforblockheight()
        self._test_getblock()
        assert self.nodes[0].verifychain(4, 0)

    def mine_chain(self):
        self.log.info(f"Generate {HEIGHT} blocks after the genesis block in 156 sec")
        for t in range(TIME_GENESIS_BLOCK, TIME_RANGE_END, TIME_RANGE_STEP):
            # 156 sec steps from genesis block time
            self.nodes[0].setmocktime(t)
            self.generatetoaddress(self.nodes[0], 1, ADDRESS_BCRT1_P2SH_OP_TRUE)
        assert_equal(self.nodes[0].getblockchaininfo()['blocks'], 200)

    def _test_max_future_block_time(self):
        self.stop_node(0)
        self.log.info("A block tip of more than MAX_FUTURE_BLOCK_TIME in the future raises an error")
        self.nodes[0].assert_start_raises_init_error(
            extra_args=[f"-mocktime={TIME_RANGE_TIP - MAX_FUTURE_BLOCK_TIME - 1}"],
            expected_msg=": The block database contains a block which appears to be from the future."
            " This may be due to your computer's date and time being set incorrectly."
            f" Only rebuild the block database if you are sure that your computer's date and time are correct.{os.linesep}"
            "Please restart with -reindex or -reindex-chainstate to recover.",
        )
        self.log.info("A block tip of MAX_FUTURE_BLOCK_TIME in the future is fine")
        self.start_node(0, extra_args=[f"-mocktime={TIME_RANGE_TIP - MAX_FUTURE_BLOCK_TIME}"])

    def _test_getblockchaininfo(self):
        self.log.info("Test getblockchaininfo")

        keys = [
            'bestblockhash',
            'blocks',
            'chain',
            'chainwork',
            'difficulty',
            'headers',
            'initialblockdownload',
            'mediantime',
            'pruned',
            'size_on_disk',
            'softforks',
            'time',
            'verificationprogress',
            'warnings',
        ]
        res = self.nodes[0].getblockchaininfo()

        assert_equal(res['time'], TIME_RANGE_END - TIME_RANGE_STEP)
        assert_equal(res['mediantime'], TIME_RANGE_MTP)

        # result should have these additional pruning keys if manual pruning is enabled
        assert_equal(sorted(res.keys()), sorted(['pruneheight', 'automatic_pruning'] + keys))

        # size_on_disk should be > 0
        assert_greater_than(res['size_on_disk'], 0)

        # pruneheight should be greater or equal to 0
        assert_greater_than_or_equal(res['pruneheight'], 0)

        # check other pruning fields given that prune=1
        assert res['pruned']
        assert not res['automatic_pruning']

        self.restart_node(0, ['-stopatheight=207', '-txindex=0'], expected_stderr=EXPECTED_STDERR_NO_GOV_PRUNE)
        res = self.nodes[0].getblockchaininfo()
        # should have exact keys
        assert_equal(sorted(res.keys()), keys)

        self.restart_node(0, ['-stopatheight=207', '-prune=550', '-txindex=0'])
        res = self.nodes[0].getblockchaininfo()
        # result should have these additional pruning keys if prune=550
        assert_equal(sorted(res.keys()), sorted(['pruneheight', 'automatic_pruning', 'prune_target_size'] + keys))

        # check related fields
        assert res['pruned']
        assert_equal(res['pruneheight'], 0)
        assert res['automatic_pruning']
        assert_equal(res['prune_target_size'], 576716800)
        assert_greater_than(res['size_on_disk'], 0)
        assert_equal(res['softforks'], {
            'bip34': {'type': 'buried', 'active': True, 'height': 1},
            'bip66': {'type': 'buried', 'active': True, 'height': 1},
            'bip65': {'type': 'buried', 'active': True, 'height': 1},
            'bip147': { 'type': 'buried', 'active': True, 'height': 1},
            'csv': {'type': 'buried', 'active': True, 'height': 1},
            'dip0001': { 'type': 'buried', 'active': True, 'height': 1},
            'dip0003': { 'type': 'buried', 'active': False, 'height': 432},
            'dip0008': { 'type': 'buried', 'active': True, 'height': 1},
            'dip0020': { 'type': 'buried', 'active': True, 'height': 1},
            'dip0024': { 'type': 'buried', 'active': True, 'height': 1},
            'realloc': { 'type': 'buried', 'active': True, 'height': 1},
            'v19': { 'type': 'buried', 'active': False, 'height': 900},
            'v20': { 'type': 'buried', 'active': False, 'height': 900},
            'mn_rr': { 'type': 'buried', 'active': False, 'height': 900},
            'withdrawals': {
                'type': 'bip9',
                'bip9': {
                    'status': 'defined',
                    'start_time': 0,
                    'timeout': 9223372036854775807,  # "withdrawals" does not have a timeout so is set to the max int64 value
                    'since': 0,
                    'min_activation_height': 0,
                    'ehf': True
                },
                'active': False},
            'testdummy': {
                'type': 'bip9',
                'bip9': {
                    'status': 'started',
                    'bit': 28,
                    'start_time': 0,
                    'timeout': 9223372036854775807,  # testdummy does not have a timeout so is set to the max int64 value
                    'since': 144,
                    'statistics': {
                        'period': 144,
                        'threshold': 108,
                        'elapsed': HEIGHT - 143,
                        'count': HEIGHT - 143,
                        'possible': True,
                    },
                    'min_activation_height': 0,
                    'ehf': False,
                },
                'active': False},
        })

    def _test_getchaintxstats(self):
        self.log.info("Test getchaintxstats")

        # Test `getchaintxstats` invalid extra parameters
        assert_raises_rpc_error(-1, 'getchaintxstats', self.nodes[0].getchaintxstats, 0, '', 0)

        # Test `getchaintxstats` invalid `nblocks`
        assert_raises_rpc_error(-1, "JSON value is not an integer as expected", self.nodes[0].getchaintxstats, '')
        assert_raises_rpc_error(-8, "Invalid block count: should be between 0 and the block's height - 1", self.nodes[0].getchaintxstats, -1)
        assert_raises_rpc_error(-8, "Invalid block count: should be between 0 and the block's height - 1", self.nodes[0].getchaintxstats, self.nodes[0].getblockcount())

        # Test `getchaintxstats` invalid `blockhash`
        assert_raises_rpc_error(-1, "JSON value is not a string as expected", self.nodes[0].getchaintxstats, blockhash=0)
        assert_raises_rpc_error(-8, "blockhash must be of length 64 (not 1, for '0')", self.nodes[0].getchaintxstats, blockhash='0')
        assert_raises_rpc_error(-8, "blockhash must be hexadecimal string (not 'ZZZ0000000000000000000000000000000000000000000000000000000000000')", self.nodes[0].getchaintxstats, blockhash='ZZZ0000000000000000000000000000000000000000000000000000000000000')
        assert_raises_rpc_error(-5, "Block not found", self.nodes[0].getchaintxstats, blockhash='0000000000000000000000000000000000000000000000000000000000000000')
        blockhash = self.nodes[0].getblockhash(HEIGHT)
        self.nodes[0].invalidateblock(blockhash)
        assert_raises_rpc_error(-8, "Block is not in main chain", self.nodes[0].getchaintxstats, blockhash=blockhash)
        self.nodes[0].reconsiderblock(blockhash)

        chaintxstats = self.nodes[0].getchaintxstats(nblocks=1)
        # 200 txs plus genesis tx
        assert_equal(chaintxstats['txcount'], HEIGHT + 1)
        # tx rate should be 1 per ~2.6 minutes (156 seconds), or 1/156
        # we have to round because of binary math
        assert_equal(round(chaintxstats['txrate'] * TIME_RANGE_STEP, 10), Decimal(1))

        b1_hash = self.nodes[0].getblockhash(1)
        b1 = self.nodes[0].getblock(b1_hash)
        b200_hash = self.nodes[0].getblockhash(HEIGHT)
        b200 = self.nodes[0].getblock(b200_hash)
        time_diff = b200['mediantime'] - b1['mediantime']

        chaintxstats = self.nodes[0].getchaintxstats()
        assert_equal(chaintxstats['time'], b200['time'])
        assert_equal(chaintxstats['txcount'], HEIGHT + 1)
        assert_equal(chaintxstats['window_final_block_hash'], b200_hash)
        assert_equal(chaintxstats['window_final_block_height'], HEIGHT )
        assert_equal(chaintxstats['window_block_count'], HEIGHT - 1)
        assert_equal(chaintxstats['window_tx_count'], HEIGHT - 1)
        assert_equal(chaintxstats['window_interval'], time_diff)
        assert_equal(round(chaintxstats['txrate'] * time_diff, 10), Decimal(HEIGHT - 1))

        chaintxstats = self.nodes[0].getchaintxstats(blockhash=b1_hash)
        assert_equal(chaintxstats['time'], b1['time'])
        assert_equal(chaintxstats['txcount'], 2)
        assert_equal(chaintxstats['window_final_block_hash'], b1_hash)
        assert_equal(chaintxstats['window_final_block_height'], 1)
        assert_equal(chaintxstats['window_block_count'], 0)
        assert 'window_tx_count' not in chaintxstats
        assert 'window_interval' not in chaintxstats
        assert 'txrate' not in chaintxstats

    def _test_gettxoutsetinfo(self):
        node = self.nodes[0]
        res = node.gettxoutsetinfo()

        assert_equal(res['total_amount'], Decimal('98214.28571450'))
        assert_equal(res['transactions'], HEIGHT)
        assert_equal(res['height'], HEIGHT)
        assert_equal(res['txouts'], HEIGHT)
        assert_equal(res['bogosize'], 14600),
        size = res['disk_size']
        assert size > 6400
        assert size < 64000
        assert_equal(len(res['bestblock']), 64)
        assert_equal(len(res['hash_serialized_2']), 64)

        self.log.info("Test gettxoutsetinfo works for blockchain with just the genesis block")
        b1hash = node.getblockhash(1)
        node.invalidateblock(b1hash)

        res2 = node.gettxoutsetinfo()
        assert_equal(res2['transactions'], 0)
        assert_equal(res2['total_amount'], Decimal('0'))
        assert_equal(res2['height'], 0)
        assert_equal(res2['txouts'], 0)
        assert_equal(res2['bogosize'], 0),
        assert_equal(res2['bestblock'], node.getblockhash(0))
        assert_equal(len(res2['hash_serialized_2']), 64)

        self.log.info("Test gettxoutsetinfo returns the same result after invalidate/reconsider block")
        node.reconsiderblock(b1hash)

        res3 = node.gettxoutsetinfo()
        # The field 'disk_size' is non-deterministic and can thus not be
        # compared between res and res3.  Everything else should be the same.
        del res['disk_size'], res3['disk_size']
        assert_equal(res, res3)

        self.log.info("Test gettxoutsetinfo hash_type option")
        # Adding hash_type 'hash_serialized_2', which is the default, should
        # not change the result.
        res4 = node.gettxoutsetinfo(hash_type='hash_serialized_2')
        del res4['disk_size']
        assert_equal(res, res4)

        # hash_type none should not return a UTXO set hash.
        res5 = node.gettxoutsetinfo(hash_type='none')
        assert 'hash_serialized_2' not in res5

        # hash_type muhash should return a different UTXO set hash.
        res6 = node.gettxoutsetinfo(hash_type='muhash')
        assert 'muhash' in res6
        assert(res['hash_serialized_2'] != res6['muhash'])

        # muhash should not be returned unless requested.
        for r in [res, res2, res3, res4, res5]:
            assert 'muhash' not in r

        # Unknown hash_type raises an error
        assert_raises_rpc_error(-8, "'foo hash' is not a valid hash_type", node.gettxoutsetinfo, "foo hash")

    def _test_getblockheader(self, rpc_name):
        self.log.info(f"Test {rpc_name}")
        node = self.nodes[0]
        rpc_call = getattr(node, rpc_name)
        assert_raises_rpc_error(-8, "hash must be of length 64 (not 8, for 'nonsense')", rpc_call, "nonsense")
        assert_raises_rpc_error(-8, "hash must be hexadecimal string (not 'ZZZ7bb8b1697ea987f3b223ba7819250cae33efacb068d23dc24859824a77844')", rpc_call, "ZZZ7bb8b1697ea987f3b223ba7819250cae33efacb068d23dc24859824a77844")
        assert_raises_rpc_error(-5, "Block not found", rpc_call, "0cf7bb8b1697ea987f3b223ba7819250cae33efacb068d23dc24859824a77844")

        besthash = node.getbestblockhash()
        secondbesthash = node.getblockhash(HEIGHT - 1)
        header = rpc_call(blockhash=besthash)
        if rpc_name == 'getblockheaders':
            assert_equal(len(header), 1)
            header = header[0]

        assert_equal(header['hash'], besthash)
        assert_equal(header['height'], HEIGHT)
        assert_equal(header['confirmations'], 1)
        assert_equal(header['previousblockhash'], secondbesthash)
        assert_is_hex_string(header['chainwork'])
        assert_equal(header['nTx'], 1)
        assert_is_hash_string(header['hash'])
        assert_is_hash_string(header['previousblockhash'])
        assert_is_hash_string(header['merkleroot'])
        assert_is_hash_string(header['bits'], length=None)
        assert isinstance(header['time'], int)
        assert_equal(header['mediantime'], TIME_RANGE_MTP)
        assert isinstance(header['nonce'], int)
        assert isinstance(header['version'], int)
        assert isinstance(int(header['versionHex'], 16), int)
        assert isinstance(header['difficulty'], Decimal)

        # Test with verbose=False, which should return the header as hex.
        header_hex = rpc_call(blockhash=besthash, verbose=False)
        if rpc_name == 'getblockheaders':
            header_hex = header_hex[0]

        assert_is_hex_string(header_hex)

        header = from_hex(CBlockHeader(), header_hex)
        header.calc_sha256()
        assert_equal(header.hash, besthash)

        if rpc_name == 'getblockheader':
            assert 'previousblockhash' not in node.getblockheader(node.getblockhash(0))
            assert 'nextblockhash' not in node.getblockheader(node.getbestblockhash())

    def _test_getdifficulty(self):
        self.log.info("Test getdifficulty")
        difficulty = self.nodes[0].getdifficulty()
        # 1 hash in 2 should be valid, so difficulty should be 1/2**31
        # binary => decimal => binary math is why we do this check
        assert abs(difficulty * 2**31 - 1) < 0.0001

    def _test_getnetworkhashps(self):
        self.log.info("Test getnetworkhashps")
        hashes_per_second = self.nodes[0].getnetworkhashps()
        # This should be 2 hashes every 2.6 minutes (156 seconds) or 1/78
        assert abs(hashes_per_second * 78 - 1) < 0.0001

    def _test_stopatheight(self):
        assert_equal(self.nodes[0].getblockcount(), HEIGHT)
        self.generatetoaddress(self.nodes[0], 6, ADDRESS_BCRT1_P2SH_OP_TRUE)
        assert_equal(self.nodes[0].getblockcount(), HEIGHT + 6)
        self.log.debug('Node should not stop at this height')
        assert_raises(subprocess.TimeoutExpired, lambda: self.nodes[0].process.wait(timeout=3))
        try:
            self.generatetoaddress(self.nodes[0], 1, ADDRESS_BCRT1_P2SH_OP_TRUE, sync_fun=self.no_op)
        except (ConnectionError, http.client.BadStatusLine):
            pass  # The node already shut down before response
        self.log.debug('Node should stop at this height...')
        self.nodes[0].wait_until_stopped()
        self.start_node(0, ['-txindex=0'])
        assert_equal(self.nodes[0].getblockcount(), HEIGHT + 7)

    def _test_waitforblockheight(self):
        self.log.info("Test waitforblockheight")
        node = self.nodes[0]
        peer = node.add_p2p_connection(P2PInterface())

        current_height = node.getblock(node.getbestblockhash())['height']

        # Create a fork somewhere below our current height, invalidate the tip
        # of that fork, and then ensure that waitforblockheight still
        # works as expected.
        #
        # (Previously this was broken based on setting
        # `rpc/blockchain.cpp:latestblock` incorrectly.)
        #
        b20hash = node.getblockhash(20)
        b20 = node.getblock(b20hash)

        def solve_and_send_block(prevhash, height, time):
            b = create_block(prevhash, create_coinbase(height), time)
            b.solve()
            peer.send_and_ping(msg_block(b))
            return b

        b21f = solve_and_send_block(int(b20hash, 16), 21, b20['time'] + 1)
        b22f = solve_and_send_block(b21f.sha256, 22, b21f.nTime + 1)

        node.invalidateblock(b22f.hash)

        def assert_waitforheight(height, timeout=2):
            assert_equal(
                node.waitforblockheight(height=height, timeout=timeout)['height'],
                current_height)

        assert_waitforheight(0)
        assert_waitforheight(current_height - 1)
        assert_waitforheight(current_height)
        assert_waitforheight(current_height + 1)

    def _test_getblock(self):
        node = self.nodes[0]

        miniwallet = MiniWallet(node)
        miniwallet.scan_blocks(num=5)

        fee_per_byte = Decimal('0.00000010')
        fee_per_kb = 1000 * fee_per_byte

        miniwallet.send_self_transfer(fee_rate=fee_per_kb, from_node=node)
        blockhash = self.generate(node, 1)[0]

        self.log.info("Test getblock with verbosity 1 doesn't include fee")
        block = node.getblock(blockhash, 1)
        assert 'fee' not in block['tx'][1]

        self.log.info('Test getblock with verbosity 2 includes expected fee')
        block = node.getblock(blockhash, 2)
        tx = block['tx'][1]
        assert 'fee' in tx
        assert_equal(tx['fee'], tx['size'] * fee_per_byte)

        self.log.info("Test getblock with verbosity 2 still works with pruned Undo data")
        datadir = get_datadir_path(self.options.tmpdir, 0)

        self.log.info("Test that getblock with invalid verbosity type returns proper error message")
        assert_raises_rpc_error(-1, "JSON value is not an integer as expected", node.getblock, blockhash, "2")

        def move_block_file(old, new):
            old_path = os.path.join(datadir, self.chain, 'blocks', old)
            new_path = os.path.join(datadir, self.chain, 'blocks', new)
            os.rename(old_path, new_path)

        # Move instead of deleting so we can restore chain state afterwards
        move_block_file('rev00000.dat', 'rev_wrong')

        block = node.getblock(blockhash, 2)
        assert 'fee' not in block['tx'][1]

        # Restore chain state
        move_block_file('rev_wrong', 'rev00000.dat')

        assert 'previousblockhash' not in node.getblock(node.getblockhash(0))
        assert 'nextblockhash' not in node.getblock(node.getbestblockhash())


if __name__ == '__main__':
    BlockchainTest().main()