def mine_large_blocks(node, n): # Make a large scriptPubKey for the coinbase transaction. This is OP_RETURN # followed by 950k of OP_NOP. This would be non-standard in a non-coinbase # transaction but is consensus valid. # Set the nTime if this is the first time this function has been called. # A static variable ensures that time is monotonicly increasing and is therefore # different for each block created => blockhash is unique. if "nTimes" not in mine_large_blocks.__dict__: mine_large_blocks.nTime = 0 # Get the block parameters for the first block big_script = CScript([OP_RETURN] + [OP_NOP] * 950000) best_block = node.getblock(node.getbestblockhash()) height = int(best_block["height"]) + 1 mine_large_blocks.nTime = max(mine_large_blocks.nTime, int(best_block["time"])) + 1 previousblockhash = int(best_block["hash"], 16) for _ in range(n): # Build the coinbase transaction (with large scriptPubKey) coinbase_tx = create_coinbase(height) coinbase_tx.vin[0].nSequence = 2**32 - 1 coinbase_tx.vout[0].scriptPubKey = big_script coinbase_tx.rehash() # Build the block block = CBlock() block.nVersion = best_block["version"] block.hashPrevBlock = previousblockhash block.nTime = mine_large_blocks.nTime block.nufos = int('207fffff', 16) block.nNonce = 0 block.vtx = [coinbase_tx] block.hashMerkleRoot = block.calc_merkle_root() block.solve() # Submit to the node node.submitblock(ToHex(block)) previousblockhash = block.sha256 height += 1 mine_large_blocks.nTime += 1
def run_test(self): self.mine_chain() node = self.nodes[0] def assert_submitblock(block, result_str_1, result_str_2=None): block.solve() result_str_2 = result_str_2 or 'duplicate-invalid' assert_equal(result_str_1, node.submitblock(hexdata=block.serialize().hex())) assert_equal(result_str_2, node.submitblock(hexdata=block.serialize().hex())) self.log.info('getmininginfo') mining_info = node.getmininginfo() assert_equal(mining_info['blocks'], 200) assert_equal(mining_info['chain'], self.chain) assert 'currentblocktx' not in mining_info assert 'currentblockweight' not in mining_info assert_equal(mining_info['difficulty'], Decimal('4.656542373906925E-10')) assert_equal(mining_info['networkhashps'], Decimal('0.003333333333333334')) assert_equal(mining_info['pooledtx'], 0) # Mine a block to leave initial block download node.generatetoaddress(1, node.get_deterministic_priv_key().address) tmpl = node.getblocktemplate(NORMAL_GBT_REQUEST_PARAMS) self.log.info("getblocktemplate: Test capability advertised") assert 'proposal' in tmpl['capabilities'] assert 'coinbasetxn' not in tmpl next_height = int(tmpl["height"]) coinbase_tx = create_coinbase(height=next_height) # sequence numbers must not be max for nLockTime to have effect coinbase_tx.vin[0].nSequence = 2**32 - 2 coinbase_tx.rehash() block = CBlock() block.nVersion = tmpl["version"] block.hashPrevBlock = int(tmpl["previousblockhash"], 16) block.nTime = tmpl["curtime"] block.nufos = int(tmpl["ufos"], 16) block.nNonce = 0 block.vtx = [coinbase_tx] self.log.info("getblocktemplate: segwit rule must be set") assert_raises_rpc_error(-8, "getblocktemplate must be called with the segwit rule set", node.getblocktemplate) self.log.info("getblocktemplate: Test valid block") assert_template(node, block, None) self.log.info("submitblock: Test block decode failure") assert_raises_rpc_error(-22, "Block decode failed", node.submitblock, block.serialize()[:-15].hex()) self.log.info("getblocktemplate: Test bad input hash for coinbase transaction") bad_block = copy.deepcopy(block) bad_block.vtx[0].vin[0].prevout.hash += 1 bad_block.vtx[0].rehash() assert_template(node, bad_block, 'bad-cb-missing') self.log.info("submitblock: Test invalid coinbase transaction") assert_raises_rpc_error(-22, "Block does not start with a coinbase", node.submitblock, bad_block.serialize().hex()) self.log.info("getblocktemplate: Test truncated final transaction") assert_raises_rpc_error(-22, "Block decode failed", node.getblocktemplate, { 'data': block.serialize()[:-1].hex(), 'mode': 'proposal', 'rules': ['segwit'], }) self.log.info("getblocktemplate: Test duplicate transaction") bad_block = copy.deepcopy(block) bad_block.vtx.append(bad_block.vtx[0]) assert_template(node, bad_block, 'bad-txns-duplicate') assert_submitblock(bad_block, 'bad-txns-duplicate', 'bad-txns-duplicate') self.log.info("getblocktemplate: Test invalid transaction") bad_block = copy.deepcopy(block) bad_tx = copy.deepcopy(bad_block.vtx[0]) bad_tx.vin[0].prevout.hash = 255 bad_tx.rehash() bad_block.vtx.append(bad_tx) assert_template(node, bad_block, 'bad-txns-inputs-missingorspent') assert_submitblock(bad_block, 'bad-txns-inputs-missingorspent') self.log.info("getblocktemplate: Test nonfinal transaction") bad_block = copy.deepcopy(block) bad_block.vtx[0].nLockTime = 2**32 - 1 bad_block.vtx[0].rehash() assert_template(node, bad_block, 'bad-txns-nonfinal') assert_submitblock(bad_block, 'bad-txns-nonfinal') self.log.info("getblocktemplate: Test bad tx count") # The tx count is immediately after the block header bad_block_sn = bytearray(block.serialize()) assert_equal(bad_block_sn[BLOCK_HEADER_SIZE], 1) bad_block_sn[BLOCK_HEADER_SIZE] += 1 assert_raises_rpc_error(-22, "Block decode failed", node.getblocktemplate, { 'data': bad_block_sn.hex(), 'mode': 'proposal', 'rules': ['segwit'], }) self.log.info("getblocktemplate: Test bad ufos") bad_block = copy.deepcopy(block) bad_block.nufos = 469762303 # impossible in the real world assert_template(node, bad_block, 'bad-diffufos') self.log.info("getblocktemplate: Test bad merkle root") bad_block = copy.deepcopy(block) bad_block.hashMerkleRoot += 1 assert_template(node, bad_block, 'bad-txnmrklroot', False) assert_submitblock(bad_block, 'bad-txnmrklroot', 'bad-txnmrklroot') self.log.info("getblocktemplate: Test bad timestamps") bad_block = copy.deepcopy(block) bad_block.nTime = 2**31 - 1 assert_template(node, bad_block, 'time-too-new') assert_submitblock(bad_block, 'time-too-new', 'time-too-new') bad_block.nTime = 0 assert_template(node, bad_block, 'time-too-old') assert_submitblock(bad_block, 'time-too-old', 'time-too-old') self.log.info("getblocktemplate: Test not best block") bad_block = copy.deepcopy(block) bad_block.hashPrevBlock = 123 assert_template(node, bad_block, 'inconclusive-not-best-prevblk') assert_submitblock(bad_block, 'prev-blk-not-found', 'prev-blk-not-found') self.log.info('submitheader tests') assert_raises_rpc_error(-22, 'Block header decode failed', lambda: node.submitheader(hexdata='xx' * BLOCK_HEADER_SIZE)) assert_raises_rpc_error(-22, 'Block header decode failed', lambda: node.submitheader(hexdata='ff' * (BLOCK_HEADER_SIZE-2))) assert_raises_rpc_error(-25, 'Must submit previous header', lambda: node.submitheader(hexdata=super(CBlock, bad_block).serialize().hex())) block.nTime += 1 block.solve() def chain_tip(b_hash, *, status='headers-only', branchlen=1): return {'hash': b_hash, 'height': 202, 'branchlen': branchlen, 'status': status} assert chain_tip(block.hash) not in node.getchaintips() node.submitheader(hexdata=block.serialize().hex()) assert chain_tip(block.hash) in node.getchaintips() node.submitheader(hexdata=CBlockHeader(block).serialize().hex()) # Noop assert chain_tip(block.hash) in node.getchaintips() bad_block_root = copy.deepcopy(block) bad_block_root.hashMerkleRoot += 2 bad_block_root.solve() assert chain_tip(bad_block_root.hash) not in node.getchaintips() node.submitheader(hexdata=CBlockHeader(bad_block_root).serialize().hex()) assert chain_tip(bad_block_root.hash) in node.getchaintips() # Should still reject invalid blocks, even if we have the header: assert_equal(node.submitblock(hexdata=bad_block_root.serialize().hex()), 'bad-txnmrklroot') assert_equal(node.submitblock(hexdata=bad_block_root.serialize().hex()), 'bad-txnmrklroot') assert chain_tip(bad_block_root.hash) in node.getchaintips() # We know the header for this invalid block, so should just return early without error: node.submitheader(hexdata=CBlockHeader(bad_block_root).serialize().hex()) assert chain_tip(bad_block_root.hash) in node.getchaintips() bad_block_lock = copy.deepcopy(block) bad_block_lock.vtx[0].nLockTime = 2**32 - 1 bad_block_lock.vtx[0].rehash() bad_block_lock.hashMerkleRoot = bad_block_lock.calc_merkle_root() bad_block_lock.solve() assert_equal(node.submitblock(hexdata=bad_block_lock.serialize().hex()), 'bad-txns-nonfinal') assert_equal(node.submitblock(hexdata=bad_block_lock.serialize().hex()), 'duplicate-invalid') # Build a "good" block on top of the submitted bad block bad_block2 = copy.deepcopy(block) bad_block2.hashPrevBlock = bad_block_lock.sha256 bad_block2.solve() assert_raises_rpc_error(-25, 'bad-prevblk', lambda: node.submitheader(hexdata=CBlockHeader(bad_block2).serialize().hex())) # Should reject invalid header right away bad_block_time = copy.deepcopy(block) bad_block_time.nTime = 1 bad_block_time.solve() assert_raises_rpc_error(-25, 'time-too-old', lambda: node.submitheader(hexdata=CBlockHeader(bad_block_time).serialize().hex())) # Should ask for the block from a p2p node, if they announce the header as well: peer = node.add_p2p_connection(P2PDataStore()) peer.wait_for_getheaders(timeout=5) # Drop the first getheaders peer.send_blocks_and_test(blocks=[block], node=node) # Must be active now: assert chain_tip(block.hash, status='active', branchlen=0) in node.getchaintips() # Building a few blocks should give the same results node.generatetoaddress(10, node.get_deterministic_priv_key().address) assert_raises_rpc_error(-25, 'time-too-old', lambda: node.submitheader(hexdata=CBlockHeader(bad_block_time).serialize().hex())) assert_raises_rpc_error(-25, 'bad-prevblk', lambda: node.submitheader(hexdata=CBlockHeader(bad_block2).serialize().hex())) node.submitheader(hexdata=CBlockHeader(block).serialize().hex()) node.submitheader(hexdata=CBlockHeader(bad_block_root).serialize().hex()) assert_equal(node.submitblock(hexdata=block.serialize().hex()), 'duplicate') # valid