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better locking, stop corrupting headers, fix some tests

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This commit is contained in:
Victor Shyba 2020-03-18 14:17:01 -03:00
parent 241e946d91
commit b04a516063
4 changed files with 49 additions and 33 deletions
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59
lbry/wallet/header.py
View file

@ -5,6 +5,7 @@ import asyncio
import hashlib
import logging
import zlib
from concurrent.futures.thread import ThreadPoolExecutor
from io import BytesIO
from contextlib import asynccontextmanager
@ -47,6 +48,7 @@ class Headers:
self.path = path
self._size: Optional[int] = None
self.chunk_getter: Optional[Callable] = None
self.executor = ThreadPoolExecutor(1)
async def open(self):
if self.path != ':memory:':
@ -54,8 +56,10 @@ class Headers:
self.io = open(self.path, 'w+b')
else:
self.io = open(self.path, 'r+b')
self._size = self.io.seek(0, os.SEEK_END) // self.header_size
async def close(self):
self.executor.shutdown()
self.io.close()
@staticmethod
@ -103,27 +107,34 @@ class Headers:
return new_target
def __len__(self) -> int:
if self._size is None:
self._size = self.io.seek(0, os.SEEK_END) // self.header_size
return self._size
def __bool__(self):
return True
async def get(self, height) -> dict:
if height < 0:
raise IndexError(f"Height cannot be negative!!")
if isinstance(height, slice):
raise NotImplementedError("Slicing of header chain has not been implemented yet.")
return self.deserialize(height, await self.get_raw_header(height))
try:
return self.deserialize(height, await self.get_raw_header(height))
except struct.error:
raise IndexError(f"failed to get {height}, at {len(self)}")
def estimated_timestamp(self, height):
return self.first_block_timestamp + (height * self.timestamp_average_offset)
async def get_raw_header(self, height) -> bytes:
await self.ensure_chunk_at(height)
self.io.seek(height * self.header_size, os.SEEK_SET)
return self.io.read(self.header_size)
if self.chunk_getter:
await self.ensure_chunk_at(height)
return await asyncio.get_running_loop().run_in_executor(self.executor, self._read, height)
async def chunk_hash(self, start, count):
def _read(self, height, count=1):
self.io.seek(height * self.header_size, os.SEEK_SET)
return self.io.read(self.header_size * count)
def chunk_hash(self, start, count):
self.io.seek(start * self.header_size, os.SEEK_SET)
return self.hash_header(self.io.read(count * self.header_size)).decode()
@ -141,16 +152,20 @@ class Headers:
zlib.decompress(base64.b64decode(headers['base64']), wbits=-15, bufsize=600_000)
)
chunk_hash = self.hash_header(chunk).decode()
if HASHES[start] == chunk_hash:
return self._write(start, chunk)
if HASHES.get(start) == chunk_hash:
return await asyncio.get_running_loop().run_in_executor(self.executor, self._write, start, chunk)
elif start not in HASHES:
return # todo: fixme
raise Exception(
f"Checkpoint mismatch at height {start}. Expected {HASHES[start]}, but got {chunk_hash} instead."
)
async def has_header(self, height):
empty = '56944c5d3f98413ef45cf54545538103cc9f298e0575820ad3591376e2e0f65d'
all_zeroes = '789d737d4f448e554b318c94063bbfa63e9ccda6e208f5648ca76ee68896557b'
return await self.chunk_hash(height, 1) not in (empty, all_zeroes)
def _has_header(height):
empty = '56944c5d3f98413ef45cf54545538103cc9f298e0575820ad3591376e2e0f65d'
all_zeroes = '789d737d4f448e554b318c94063bbfa63e9ccda6e208f5648ca76ee68896557b'
return self.chunk_hash(height, 1) not in (empty, all_zeroes)
return await asyncio.get_running_loop().run_in_executor(self.executor, _has_header, height)
@property
def height(self) -> int:
@ -216,11 +231,11 @@ class Headers:
def _write(self, height, verified_chunk):
self.io.seek(height * self.header_size, os.SEEK_SET)
written = self.io.write(verified_chunk) // self.header_size
self.io.truncate()
# self.io.truncate()
# .seek()/.write()/.truncate() might also .flush() when needed
# the goal here is mainly to ensure we're definitely flush()'ing
self.io.flush()
self._size = self.io.tell() // self.header_size
self._size = self.io.seek(0, os.SEEK_END) // self.header_size
return written
async def validate_chunk(self, height, chunk):
@ -272,8 +287,9 @@ class Headers:
previous_header_hash = fail = None
batch_size = 36
for start_height in range(0, self.height, batch_size):
self.io.seek(self.header_size * start_height)
headers = self.io.read(self.header_size*batch_size)
headers = await asyncio.get_running_loop().run_in_executor(
self.executor, self._read, start_height, batch_size
)
if len(headers) % self.header_size != 0:
headers = headers[:(len(headers) // self.header_size) * self.header_size]
for header_hash, header in self._iterate_headers(start_height, headers):
@ -286,11 +302,12 @@ class Headers:
fail = True
if fail:
log.warning("Header file corrupted at height %s, truncating it.", height - 1)
self.io.seek(max(0, (height - 1)) * self.header_size, os.SEEK_SET)
self.io.truncate()
self.io.flush()
self._size = None
return
def __truncate(at_height):
self.io.seek(max(0, (at_height - 1)) * self.header_size, os.SEEK_SET)
self.io.truncate()
self.io.flush()
self._size = self.io.seek(0, os.SEEK_END) // self.header_size
return await asyncio.get_running_loop().run_in_executor(self.executor, __truncate, height)
previous_header_hash = header_hash
@classmethod

17
lbry/wallet/ledger.py
View file

@ -316,9 +316,6 @@ class Ledger(metaclass=LedgerRegistry):
first_connection = self.network.on_connected.first
asyncio.ensure_future(self.network.start())
await first_connection
async with self._header_processing_lock:
await self._update_tasks.add(self.initial_headers_sync())
await self._on_ready_controller.stream.first
await asyncio.gather(*(a.maybe_migrate_certificates() for a in self.accounts))
await asyncio.gather(*(a.save_max_gap() for a in self.accounts))
if len(self.accounts) > 10:
@ -329,8 +326,10 @@ class Ledger(metaclass=LedgerRegistry):
async def join_network(self, *_):
log.info("Subscribing and updating accounts.")
#async with self._header_processing_lock:
# await self.update_headers()
self._update_tasks.add(self.initial_headers_sync())
async with self._header_processing_lock:
await self.headers.ensure_tip()
await self.update_headers()
await self.subscribe_accounts()
await self._update_tasks.done.wait()
self._on_ready_controller.add(True)
@ -348,16 +347,12 @@ class Ledger(metaclass=LedgerRegistry):
async def initial_headers_sync(self):
target = self.network.remote_height + 1
current = len(self.headers)
get_chunk = partial(self.network.retriable_call, self.network.get_headers, count=1000, b64=True)
self.headers.chunk_getter = get_chunk
await self.headers.ensure_tip()
async def doit():
for height in range(current, target, 1000):
for height in reversed(range(0, target, 1000)):
await self.headers.ensure_chunk_at(height)
self._download_height = height
log.info("Headers sync: %s / %s", self._download_height, target)
asyncio.ensure_future(doit())
return
@ -598,7 +593,7 @@ class Ledger(metaclass=LedgerRegistry):
async def maybe_verify_transaction(self, tx, remote_height):
tx.height = remote_height
if 0 < remote_height < self.network.remote_height:
if 0 < remote_height < len(self.headers):
merkle = await self.network.retriable_call(self.network.get_merkle, tx.id, remote_height)
merkle_root = self.get_root_of_merkle_tree(merkle['merkle'], merkle['pos'], tx.hash)
header = await self.headers.get(remote_height)

4
tests/unit/wallet/test_headers.py
View file

@ -42,6 +42,7 @@ class TestHeaders(AsyncioTestCase):
async def test_connect_from_genesis(self):
headers = Headers(':memory:')
await headers.open()
self.assertEqual(headers.height, -1)
await headers.connect(0, HEADERS)
self.assertEqual(headers.height, 19)
@ -49,6 +50,7 @@ class TestHeaders(AsyncioTestCase):
async def test_connect_from_middle(self):
h = Headers(':memory:')
h.io.write(HEADERS[:block_bytes(10)])
await h.open()
self.assertEqual(h.height, 9)
await h.connect(len(h), HEADERS[block_bytes(10):block_bytes(20)])
self.assertEqual(h.height, 19)
@ -140,6 +142,7 @@ class TestHeaders(AsyncioTestCase):
async def test_checkpointed_writer(self):
headers = Headers(':memory:')
await headers.open()
getblocks = lambda start, end: HEADERS[block_bytes(start):block_bytes(end)]
headers.checkpoint = 10, hexlify(sha256(getblocks(10, 11)))
async with headers.checkpointed_connector() as buff:
@ -149,6 +152,7 @@ class TestHeaders(AsyncioTestCase):
buff.write(getblocks(10, 19))
self.assertEqual(len(headers), 19)
headers = Headers(':memory:')
await headers.open()
async with headers.checkpointed_connector() as buff:
buff.write(getblocks(0, 19))
self.assertEqual(len(headers), 19)

2
tests/unit/wallet/test_ledger.py
View file

@ -67,7 +67,7 @@ class LedgerTestCase(AsyncioTestCase):
serialized = self.make_header(**kwargs)
self.ledger.headers.io.seek(0, os.SEEK_END)
self.ledger.headers.io.write(serialized)
self.ledger.headers._size = None
self.ledger.headers._size = self.ledger.headers.io.seek(0, os.SEEK_END) // self.ledger.headers.header_size
class TestSynchronization(LedgerTestCase):