109 lines
4.2 KiB
Python
109 lines
4.2 KiB
Python
import os
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from urllib.request import Request, urlopen
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from torba.testcase import AsyncioTestCase
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from torba.coin.bitcoinsegwit import MainHeaders
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def block_bytes(blocks):
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return blocks * MainHeaders.header_size
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class BitcoinHeadersTestCase(AsyncioTestCase):
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# Download headers instead of storing them in git.
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HEADER_URL = 'http://headers.electrum.org/blockchain_headers'
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HEADER_FILE = 'bitcoin_headers'
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HEADER_BYTES = block_bytes(32260) # 2.6MB
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RETARGET_BLOCK = 32256 # difficulty: 1 -> 1.18
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def setUp(self):
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self.maxDiff = None
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self.header_file_name = os.path.join(os.path.dirname(__file__), self.HEADER_FILE)
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if not os.path.exists(self.header_file_name):
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req = Request(self.HEADER_URL)
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req.add_header('Range', 'bytes=0-{}'.format(self.HEADER_BYTES-1))
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with urlopen(req) as response, open(self.header_file_name, 'wb') as header_file:
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header_file.write(response.read())
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if os.path.getsize(self.header_file_name) != self.HEADER_BYTES:
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os.remove(self.header_file_name)
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raise Exception(
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"Downloaded headers for testing are not the correct number of bytes. "
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"They were deleted. Try running the tests again."
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)
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def get_bytes(self, upto: int = -1, after: int = 0) -> bytes:
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with open(self.header_file_name, 'rb') as headers:
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headers.seek(after, os.SEEK_SET)
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return headers.read(upto)
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async def get_headers(self, upto: int = -1):
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h = MainHeaders(':memory:')
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h.io.write(self.get_bytes(upto))
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return h
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class BasicHeadersTests(BitcoinHeadersTestCase):
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async def test_serialization(self):
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h = await self.get_headers()
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self.assertEqual(h[0], {
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'bits': 486604799,
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'block_height': 0,
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'merkle_root': b'4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b',
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'nonce': 2083236893,
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'prev_block_hash': b'0000000000000000000000000000000000000000000000000000000000000000',
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'timestamp': 1231006505,
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'version': 1
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})
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self.assertEqual(h[self.RETARGET_BLOCK-1], {
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'bits': 486604799,
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'block_height': 32255,
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'merkle_root': b'89b4f223789e40b5b475af6483bb05bceda54059e17d2053334b358f6bb310ac',
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'nonce': 312762301,
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'prev_block_hash': b'000000006baebaa74cecde6c6787c26ee0a616a3c333261bff36653babdac149',
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'timestamp': 1262152739,
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'version': 1
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})
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self.assertEqual(h[self.RETARGET_BLOCK], {
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'bits': 486594666,
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'block_height': 32256,
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'merkle_root': b'64b5e5f5a262f47af443a0120609206a3305877693edfe03e994f20a024ab627',
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'nonce': 121087187,
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'prev_block_hash': b'00000000984f962134a7291e3693075ae03e521f0ee33378ec30a334d860034b',
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'timestamp': 1262153464,
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'version': 1
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})
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self.assertEqual(h[self.RETARGET_BLOCK+1], {
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'bits': 486594666,
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'block_height': 32257,
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'merkle_root': b'4d1488981f08b3037878193297dbac701a2054e0f803d4424fe6a4d763d62334',
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'nonce': 274675219,
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'prev_block_hash': b'000000004f2886a170adb7204cb0c7a824217dd24d11a74423d564c4e0904967',
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'timestamp': 1262154352,
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'version': 1
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})
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self.assertEqual(
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h.serialize(h[0]),
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h.get_raw_header(0)
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)
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self.assertEqual(
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h.serialize(h[self.RETARGET_BLOCK]),
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h.get_raw_header(self.RETARGET_BLOCK)
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)
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async def test_connect_from_genesis_to_3000_past_first_chunk_at_2016(self):
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headers = MainHeaders(':memory:')
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self.assertEqual(headers.height, -1)
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await headers.connect(0, self.get_bytes(block_bytes(3001)))
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self.assertEqual(headers.height, 3000)
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async def test_connect_9_blocks_passing_a_retarget_at_32256(self):
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retarget = block_bytes(self.RETARGET_BLOCK-5)
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headers = await self.get_headers(upto=retarget)
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remainder = self.get_bytes(after=retarget)
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self.assertEqual(headers.height, 32250)
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await headers.connect(len(headers), remainder)
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self.assertEqual(headers.height, 32259)
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