266 lines
13 KiB
Python
266 lines
13 KiB
Python
import time
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import os
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import sys
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from hashlib import sha256
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from chiapos import DiskPlotter, DiskProver
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from typing import List, Dict
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from blspy import PublicKey, PrivateKey, PrependSignature
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from src.types.sized_bytes import bytes32
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from src.types.full_block import FullBlock
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from src.types.trunk_block import TrunkBlock
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from src.types.block_body import BlockBody
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from src.types.challenge import Challenge
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from src.types.block_header import BlockHeader, BlockHeaderData
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from src.types.proof_of_space import ProofOfSpace
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from src.types.proof_of_time import ProofOfTime, ProofOfTimeOutput
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from src.types.classgroup import ClassgroupElement
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from src.consensus import pot_iterations, block_rewards
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from src.util.ints import uint64, uint32, uint8
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from src.util.errors import NoProofsOfSpaceFound
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from src.types.coinbase import CoinbaseInfo
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from src.types.fees_target import FeesTarget
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from lib.chiavdf.inkfish.create_discriminant import create_discriminant
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from lib.chiavdf.inkfish.classgroup import ClassGroup
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from lib.chiavdf.inkfish.proof_of_time import create_proof_of_time_nwesolowski
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from src.consensus.constants import constants
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from src.consensus.pot_iterations import calculate_ips_from_iterations
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# Can't go much lower than 19, since plots start having no solutions
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k = 19
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# Uses many plots for testing, in order to guarantee proofs of space at every height
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num_plots = 80
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# Use the empty string as the seed for the private key
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pool_sk: PrivateKey = PrivateKey.from_seed(b'')
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pool_pk: PublicKey = pool_sk.get_public_key()
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plot_sks: List[PrivateKey] = [PrivateKey.from_seed(pn.to_bytes(4, "big")) for pn in range(num_plots)]
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plot_pks: List[PublicKey] = [sk.get_public_key() for sk in plot_sks]
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farmer_sk: PrivateKey = PrivateKey.from_seed(b'coinbase')
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coinbase_target = sha256(farmer_sk.get_public_key().serialize()).digest()
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fee_target = sha256(farmer_sk.get_public_key().serialize()).digest()
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n_wesolowski = 3
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class BlockTools:
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"""
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Tools to generate blocks for testing.
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"""
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def __init__(self):
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plot_seeds: List[bytes32] = [ProofOfSpace.calculate_plot_seed(pool_pk, plot_pk) for plot_pk in plot_pks]
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self.filenames: List[str] = [os.path.join("tests", "plots", "genesis-plots-" + str(k) +
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sha256(int.to_bytes(i, 4, "big")).digest().hex() + ".dat")
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for i in range(num_plots)]
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try:
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for pn, filename in enumerate(self.filenames):
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if not os.path.exists(filename):
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plotter = DiskPlotter()
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plotter.create_plot_disk(filename, k, b"genesis", plot_seeds[pn])
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except KeyboardInterrupt:
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for filename in self.filenames:
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if os.path.exists(filename):
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os.remove(filename)
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sys.exit(1)
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def get_consecutive_blocks(self,
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input_constants: Dict,
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num_blocks: int,
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block_list: List[FullBlock] = [],
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seconds_per_block=constants["BLOCK_TIME_TARGET"],
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seed: uint64 = uint64(0)) -> List[FullBlock]:
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test_constants = constants.copy()
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for key, value in input_constants.items():
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test_constants[key] = value
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if len(block_list) == 0:
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if "GENESIS_BLOCK" in test_constants:
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block_list.append(FullBlock.from_bytes(test_constants["GENESIS_BLOCK"]))
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else:
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block_list.append(self.create_genesis_block(test_constants, bytes([(seed) % 256]*32), seed))
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prev_difficulty = test_constants["DIFFICULTY_STARTING"]
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curr_difficulty = prev_difficulty
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curr_ips = test_constants["VDF_IPS_STARTING"]
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elif len(block_list) < (test_constants["DIFFICULTY_EPOCH"] + test_constants["DIFFICULTY_DELAY"]):
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# First epoch (+delay), so just get first difficulty
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prev_difficulty = block_list[0].weight
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curr_difficulty = block_list[0].weight
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assert test_constants["DIFFICULTY_STARTING"] == prev_difficulty
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curr_ips = test_constants["VDF_IPS_STARTING"]
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else:
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curr_difficulty = block_list[-1].weight - block_list[-2].weight
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prev_difficulty = (block_list[-1 - test_constants["DIFFICULTY_EPOCH"]].weight -
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block_list[-2 - test_constants["DIFFICULTY_EPOCH"]].weight)
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curr_ips = calculate_ips_from_iterations(block_list[-1].trunk_block.proof_of_space,
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block_list[-1].trunk_block.proof_of_time.output.challenge_hash,
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curr_difficulty,
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block_list[-1].trunk_block.proof_of_time.output
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.number_of_iterations,
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test_constants["MIN_BLOCK_TIME"])
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starting_height = block_list[-1].height + 1
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timestamp = block_list[-1].trunk_block.header.data.timestamp
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for next_height in range(starting_height, starting_height + num_blocks):
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if (next_height > test_constants["DIFFICULTY_EPOCH"] and
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next_height % test_constants["DIFFICULTY_EPOCH"] == test_constants["DIFFICULTY_DELAY"]):
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# Calculates new difficulty
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height1 = uint64(next_height - (test_constants["DIFFICULTY_EPOCH"] +
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test_constants["DIFFICULTY_DELAY"]) - 1)
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height2 = uint64(next_height - (test_constants["DIFFICULTY_EPOCH"]) - 1)
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height3 = uint64(next_height - (test_constants["DIFFICULTY_DELAY"]) - 1)
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if height1 >= 0:
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timestamp1 = block_list[height1].trunk_block.header.data.timestamp
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iters1 = block_list[height1].trunk_block.challenge.total_iters
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else:
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timestamp1 = (block_list[0].trunk_block.header.data.timestamp -
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test_constants["BLOCK_TIME_TARGET"])
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iters1 = block_list[0].trunk_block.challenge.total_iters
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timestamp2 = block_list[height2].trunk_block.header.data.timestamp
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timestamp3 = block_list[height3].trunk_block.header.data.timestamp
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iters3 = block_list[height3].trunk_block.challenge.total_iters
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term1 = (test_constants["DIFFICULTY_DELAY"] * prev_difficulty *
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(timestamp3 - timestamp2) * test_constants["BLOCK_TIME_TARGET"])
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term2 = ((test_constants["DIFFICULTY_WARP_FACTOR"] - 1) *
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(test_constants["DIFFICULTY_EPOCH"] - test_constants["DIFFICULTY_DELAY"]) * curr_difficulty
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* (timestamp2 - timestamp1) * test_constants["BLOCK_TIME_TARGET"])
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# Round down after the division
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new_difficulty: uint64 = uint64((term1 + term2) //
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(test_constants["DIFFICULTY_WARP_FACTOR"] *
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(timestamp3 - timestamp2) *
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(timestamp2 - timestamp1)))
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if new_difficulty >= curr_difficulty:
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new_difficulty = min(new_difficulty, uint64(test_constants["DIFFICULTY_FACTOR"] *
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curr_difficulty))
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else:
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new_difficulty = max([uint64(1), new_difficulty,
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uint64(curr_difficulty // test_constants["DIFFICULTY_FACTOR"])])
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prev_difficulty = curr_difficulty
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curr_difficulty = new_difficulty
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curr_ips = uint64((iters3 - iters1)//(timestamp3 - timestamp1))
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time_taken = seconds_per_block
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timestamp += time_taken
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block_list.append(self.create_next_block(test_constants, block_list[-1], timestamp, curr_difficulty,
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curr_ips, seed))
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return block_list
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def create_genesis_block(self, input_constants: Dict, challenge_hash=bytes([0]*32),
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seed: uint64 = uint64(0)) -> FullBlock:
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"""
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Creates the genesis block with the specified details.
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"""
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test_constants = constants.copy()
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for key, value in input_constants.items():
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test_constants[key] = value
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return self._create_block(
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test_constants,
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challenge_hash,
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uint32(0),
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bytes([0]*32),
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uint64(0),
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uint64(0),
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uint64(time.time()),
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uint64(test_constants["DIFFICULTY_STARTING"]),
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uint64(test_constants["VDF_IPS_STARTING"]),
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seed
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)
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def create_next_block(self, input_constants: Dict, prev_block: FullBlock, timestamp: uint64,
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difficulty: uint64, ips: uint64,
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seed: int = 0) -> FullBlock:
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"""
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Creates the next block with the specified details.
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"""
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test_constants = constants.copy()
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for key, value in input_constants.items():
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test_constants[key] = value
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return self._create_block(
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test_constants,
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prev_block.trunk_block.challenge.get_hash(),
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prev_block.height + 1,
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prev_block.header_hash,
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prev_block.trunk_block.challenge.total_iters,
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prev_block.weight,
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timestamp,
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uint64(difficulty),
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ips,
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seed
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)
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def _create_block(self, test_constants: Dict, challenge_hash: bytes32, height: uint32, prev_header_hash: bytes32,
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prev_iters: uint64, prev_weight: uint64, timestamp: uint64, difficulty: uint64,
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ips: uint64, seed: int) -> FullBlock:
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"""
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Creates a block with the specified details. Uses the stored plots to create a proof of space,
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and also evaluates the VDF for the proof of time.
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"""
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prover = None
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plot_pk = None
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plot_sk = None
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qualities = []
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for pn in range(num_plots):
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seeded_pn = (pn + 17 * seed) % num_plots # Allow passing in seed, to create reorgs and different chains
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filename = self.filenames[seeded_pn]
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plot_pk = plot_pks[seeded_pn]
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plot_sk = plot_sks[seeded_pn]
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prover = DiskProver(filename)
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qualities = prover.get_qualities_for_challenge(challenge_hash)
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if len(qualities) > 0:
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break
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if len(qualities) == 0:
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raise NoProofsOfSpaceFound("No proofs for this challenge")
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proof_xs: bytes = prover.get_full_proof(challenge_hash, 0)
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proof_of_space: ProofOfSpace = ProofOfSpace(pool_pk, plot_pk, k, list(proof_xs))
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number_iters: uint64 = pot_iterations.calculate_iterations(proof_of_space, challenge_hash,
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difficulty, ips,
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test_constants["MIN_BLOCK_TIME"])
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disc: int = create_discriminant(challenge_hash, test_constants["DISCRIMINANT_SIZE_BITS"])
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start_x: ClassGroup = ClassGroup.from_ab_discriminant(2, 1, disc)
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y_cl, proof_bytes = create_proof_of_time_nwesolowski(
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disc, start_x, number_iters, disc, n_wesolowski)
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output = ProofOfTimeOutput(challenge_hash, number_iters,
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ClassgroupElement(y_cl[0], y_cl[1]))
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proof_of_time = ProofOfTime(output, n_wesolowski, [uint8(b) for b in proof_bytes])
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coinbase: CoinbaseInfo = CoinbaseInfo(height, block_rewards.calculate_block_reward(uint32(height)),
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coinbase_target)
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coinbase_sig: PrependSignature = pool_sk.sign_prepend(coinbase.serialize())
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fees_target: FeesTarget = FeesTarget(fee_target, 0)
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body: BlockBody = BlockBody(coinbase, coinbase_sig, fees_target, None, bytes([0]*32))
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header_data: BlockHeaderData = BlockHeaderData(prev_header_hash, timestamp, bytes([0]*32),
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proof_of_space.get_hash(), body.get_hash(),
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bytes([0]*32))
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header_hash_sig: PrependSignature = plot_sk.sign_prepend(header_data.get_hash())
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header: BlockHeader = BlockHeader(header_data, header_hash_sig)
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challenge = Challenge(proof_of_space.get_hash(), proof_of_time.get_hash(), height,
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prev_weight + difficulty, prev_iters + number_iters)
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trunk_block = TrunkBlock(proof_of_space, proof_of_time, challenge, header)
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full_block: FullBlock = FullBlock(trunk_block, body)
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return full_block
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# This code generates a genesis block, uncomment to output genesis block to terminal
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# This might take a while, using the python VDF implementation.
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# Run by doing python -m tests.block_tools
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# bt = BlockTools()
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# print(bt.create_genesis_block({}, bytes([1]*32), uint64(0)).serialize())
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