commit d062548e411b4ed60ea68428684c8cea7a40a759
parent e12af33626622809640fc29804e0ef14ae3dfb9b
Author: ThomasV <thomasv@electrum.org>
Date: Wed, 28 Nov 2018 12:54:57 +0100
Merge pull request #4861 from SomberNight/blockchain_fork_ids
blockchain: generalise fork handling and follow most work chain
Diffstat:
9 files changed, 513 insertions(+), 172 deletions(-)
diff --git a/electrum/blockchain.py b/electrum/blockchain.py
@@ -79,26 +79,72 @@ def hash_raw_header(header: str) -> str:
return hash_encode(sha256d(bfh(header)))
-blockchains = {} # type: Dict[int, Blockchain]
-blockchains_lock = threading.Lock()
-
-
-def read_blockchains(config: 'SimpleConfig') -> Dict[int, 'Blockchain']:
- blockchains[0] = Blockchain(config, 0, None)
+# key: blockhash hex at forkpoint
+# the chain at some key is the best chain that includes the given hash
+blockchains = {} # type: Dict[str, Blockchain]
+blockchains_lock = threading.RLock()
+
+
+def read_blockchains(config: 'SimpleConfig'):
+ blockchains[constants.net.GENESIS] = Blockchain(config=config,
+ forkpoint=0,
+ parent=None,
+ forkpoint_hash=constants.net.GENESIS,
+ prev_hash=None)
fdir = os.path.join(util.get_headers_dir(config), 'forks')
util.make_dir(fdir)
- l = filter(lambda x: x.startswith('fork_'), os.listdir(fdir))
- l = sorted(l, key = lambda x: int(x.split('_')[1]))
- for filename in l:
- forkpoint = int(filename.split('_')[2])
- parent_id = int(filename.split('_')[1])
- b = Blockchain(config, forkpoint, parent_id)
- h = b.read_header(b.forkpoint)
- if b.parent().can_connect(h, check_height=False):
- blockchains[b.forkpoint] = b
+ # files are named as: fork2_{forkpoint}_{prev_hash}_{first_hash}
+ l = filter(lambda x: x.startswith('fork2_') and '.' not in x, os.listdir(fdir))
+ l = sorted(l, key=lambda x: int(x.split('_')[1])) # sort by forkpoint
+
+ def delete_chain(filename, reason):
+ util.print_error("[blockchain]", reason, filename)
+ os.unlink(os.path.join(fdir, filename))
+
+ def instantiate_chain(filename):
+ __, forkpoint, prev_hash, first_hash = filename.split('_')
+ forkpoint = int(forkpoint)
+ prev_hash = (64-len(prev_hash)) * "0" + prev_hash # left-pad with zeroes
+ first_hash = (64-len(first_hash)) * "0" + first_hash
+ # forks below the max checkpoint are not allowed
+ if forkpoint <= constants.net.max_checkpoint():
+ delete_chain(filename, "deleting fork below max checkpoint")
+ return
+ # find parent (sorting by forkpoint guarantees it's already instantiated)
+ for parent in blockchains.values():
+ if parent.check_hash(forkpoint - 1, prev_hash):
+ break
else:
- util.print_error("cannot connect", filename)
- return blockchains
+ delete_chain(filename, "cannot find parent for chain")
+ return
+ b = Blockchain(config=config,
+ forkpoint=forkpoint,
+ parent=parent,
+ forkpoint_hash=first_hash,
+ prev_hash=prev_hash)
+ # consistency checks
+ h = b.read_header(b.forkpoint)
+ if first_hash != hash_header(h):
+ delete_chain(filename, "incorrect first hash for chain")
+ return
+ if not b.parent.can_connect(h, check_height=False):
+ delete_chain(filename, "cannot connect chain to parent")
+ return
+ chain_id = b.get_id()
+ assert first_hash == chain_id, (first_hash, chain_id)
+ blockchains[chain_id] = b
+
+ for filename in l:
+ instantiate_chain(filename)
+
+
+def get_best_chain() -> 'Blockchain':
+ return blockchains[constants.net.GENESIS]
+
+# block hash -> chain work; up to and including that block
+_CHAINWORK_CACHE = {
+ "0000000000000000000000000000000000000000000000000000000000000000": 0, # virtual block at height -1
+} # type: Dict[str, int]
class Blockchain(util.PrintError):
@@ -106,15 +152,20 @@ class Blockchain(util.PrintError):
Manages blockchain headers and their verification
"""
- def __init__(self, config: SimpleConfig, forkpoint: int, parent_id: Optional[int]):
+ def __init__(self, config: SimpleConfig, forkpoint: int, parent: Optional['Blockchain'],
+ forkpoint_hash: str, prev_hash: Optional[str]):
+ assert isinstance(forkpoint_hash, str) and len(forkpoint_hash) == 64, forkpoint_hash
+ assert (prev_hash is None) or (isinstance(prev_hash, str) and len(prev_hash) == 64), prev_hash
+ # assert (parent is None) == (forkpoint == 0)
+ if 0 < forkpoint <= constants.net.max_checkpoint():
+ raise Exception(f"cannot fork below max checkpoint. forkpoint: {forkpoint}")
self.config = config
- self.forkpoint = forkpoint
- self.checkpoints = constants.net.CHECKPOINTS
- self.parent_id = parent_id
- assert parent_id != forkpoint
+ self.forkpoint = forkpoint # height of first header
+ self.parent = parent
+ self._forkpoint_hash = forkpoint_hash # blockhash at forkpoint. "first hash"
+ self._prev_hash = prev_hash # blockhash immediately before forkpoint
self.lock = threading.RLock()
- with self.lock:
- self.update_size()
+ self.update_size()
def with_lock(func):
def func_wrapper(self, *args, **kwargs):
@@ -122,12 +173,13 @@ class Blockchain(util.PrintError):
return func(self, *args, **kwargs)
return func_wrapper
- def parent(self) -> 'Blockchain':
- return blockchains[self.parent_id]
+ @property
+ def checkpoints(self):
+ return constants.net.CHECKPOINTS
def get_max_child(self) -> Optional[int]:
with blockchains_lock: chains = list(blockchains.values())
- children = list(filter(lambda y: y.parent_id==self.forkpoint, chains))
+ children = list(filter(lambda y: y.parent==self, chains))
return max([x.forkpoint for x in children]) if children else None
def get_max_forkpoint(self) -> int:
@@ -137,11 +189,12 @@ class Blockchain(util.PrintError):
mc = self.get_max_child()
return mc if mc is not None else self.forkpoint
+ @with_lock
def get_branch_size(self) -> int:
return self.height() - self.get_max_forkpoint() + 1
def get_name(self) -> str:
- return self.get_hash(self.get_max_forkpoint()).lstrip('00')[0:10]
+ return self.get_hash(self.get_max_forkpoint()).lstrip('0')[0:10]
def check_header(self, header: dict) -> bool:
header_hash = hash_header(header)
@@ -159,24 +212,38 @@ class Blockchain(util.PrintError):
return False
def fork(parent, header: dict) -> 'Blockchain':
+ if not parent.can_connect(header, check_height=False):
+ raise Exception("forking header does not connect to parent chain")
forkpoint = header.get('block_height')
- self = Blockchain(parent.config, forkpoint, parent.forkpoint)
+ self = Blockchain(config=parent.config,
+ forkpoint=forkpoint,
+ parent=parent,
+ forkpoint_hash=hash_header(header),
+ prev_hash=parent.get_hash(forkpoint-1))
open(self.path(), 'w+').close()
self.save_header(header)
+ # put into global dict
+ chain_id = self.get_id()
+ with blockchains_lock:
+ assert chain_id not in blockchains, (chain_id, list(blockchains))
+ blockchains[chain_id] = self
return self
+ @with_lock
def height(self) -> int:
return self.forkpoint + self.size() - 1
+ @with_lock
def size(self) -> int:
- with self.lock:
- return self._size
+ return self._size
+ @with_lock
def update_size(self) -> None:
p = self.path()
self._size = os.path.getsize(p)//HEADER_SIZE if os.path.exists(p) else 0
- def verify_header(self, header: dict, prev_hash: str, target: int, expected_header_hash: str=None) -> None:
+ @classmethod
+ def verify_header(cls, header: dict, prev_hash: str, target: int, expected_header_hash: str=None) -> None:
_hash = hash_header(header)
if expected_header_hash and expected_header_hash != _hash:
raise Exception("hash mismatches with expected: {} vs {}".format(expected_header_hash, _hash))
@@ -184,7 +251,7 @@ class Blockchain(util.PrintError):
raise Exception("prev hash mismatch: %s vs %s" % (prev_hash, header.get('prev_block_hash')))
if constants.net.TESTNET:
return
- bits = self.target_to_bits(target)
+ bits = cls.target_to_bits(target)
if bits != header.get('bits'):
raise Exception("bits mismatch: %s vs %s" % (bits, header.get('bits')))
block_hash_as_num = int.from_bytes(bfh(_hash), byteorder='big')
@@ -207,21 +274,26 @@ class Blockchain(util.PrintError):
self.verify_header(header, prev_hash, target, expected_header_hash)
prev_hash = hash_header(header)
+ @with_lock
def path(self):
d = util.get_headers_dir(self.config)
- if self.parent_id is None:
+ if self.parent is None:
filename = 'blockchain_headers'
else:
- basename = 'fork_%d_%d' % (self.parent_id, self.forkpoint)
+ assert self.forkpoint > 0, self.forkpoint
+ prev_hash = self._prev_hash.lstrip('0')
+ first_hash = self._forkpoint_hash.lstrip('0')
+ basename = f'fork2_{self.forkpoint}_{prev_hash}_{first_hash}'
filename = os.path.join('forks', basename)
return os.path.join(d, filename)
@with_lock
def save_chunk(self, index: int, chunk: bytes):
+ assert index >= 0, index
chunk_within_checkpoint_region = index < len(self.checkpoints)
# chunks in checkpoint region are the responsibility of the 'main chain'
- if chunk_within_checkpoint_region and self.parent_id is not None:
- main_chain = blockchains[0]
+ if chunk_within_checkpoint_region and self.parent is not None:
+ main_chain = get_best_chain()
main_chain.save_chunk(index, chunk)
return
@@ -236,18 +308,36 @@ class Blockchain(util.PrintError):
self.write(chunk, delta_bytes, truncate)
self.swap_with_parent()
- @with_lock
def swap_with_parent(self) -> None:
- if self.parent_id is None:
- return
- parent_branch_size = self.parent().height() - self.forkpoint + 1
- if parent_branch_size >= self.size():
- return
- self.print_error("swap", self.forkpoint, self.parent_id)
- parent_id = self.parent_id
- forkpoint = self.forkpoint
- parent = self.parent()
+ parent_lock = self.parent.lock if self.parent is not None else threading.Lock()
+ with parent_lock, self.lock, blockchains_lock: # this order should not deadlock
+ # do the swap; possibly multiple ones
+ cnt = 0
+ while self._swap_with_parent():
+ cnt += 1
+ if cnt > len(blockchains): # make sure we are making progress
+ raise Exception(f'swapping fork with parent too many times: {cnt}')
+
+ def _swap_with_parent(self) -> bool:
+ """Check if this chain became stronger than its parent, and swap
+ the underlying files if so. The Blockchain instances will keep
+ 'containing' the same headers, but their ids change and so
+ they will be stored in different files."""
+ if self.parent is None:
+ return False
+ if self.parent.get_chainwork() >= self.get_chainwork():
+ return False
+ self.print_error("swap", self.forkpoint, self.parent.forkpoint)
+ parent_branch_size = self.parent.height() - self.forkpoint + 1
+ forkpoint = self.forkpoint # type: Optional[int]
+ parent = self.parent # type: Optional[Blockchain]
+ child_old_id = self.get_id()
+ parent_old_id = parent.get_id()
+ # swap files
+ # child takes parent's name
+ # parent's new name will be something new (not child's old name)
self.assert_headers_file_available(self.path())
+ child_old_name = self.path()
with open(self.path(), 'rb') as f:
my_data = f.read()
self.assert_headers_file_available(parent.path())
@@ -256,24 +346,28 @@ class Blockchain(util.PrintError):
parent_data = f.read(parent_branch_size*HEADER_SIZE)
self.write(parent_data, 0)
parent.write(my_data, (forkpoint - parent.forkpoint)*HEADER_SIZE)
- # store file path
- with blockchains_lock: chains = list(blockchains.values())
- for b in chains:
- b.old_path = b.path()
# swap parameters
- self.parent_id = parent.parent_id; parent.parent_id = parent_id
- self.forkpoint = parent.forkpoint; parent.forkpoint = forkpoint
- self._size = parent._size; parent._size = parent_branch_size
- # move files
- for b in chains:
- if b in [self, parent]: continue
- if b.old_path != b.path():
- self.print_error("renaming", b.old_path, b.path())
- os.rename(b.old_path, b.path())
+ self.parent, parent.parent = parent.parent, self # type: Optional[Blockchain], Optional[Blockchain]
+ self.forkpoint, parent.forkpoint = parent.forkpoint, self.forkpoint
+ self._forkpoint_hash, parent._forkpoint_hash = parent._forkpoint_hash, hash_raw_header(bh2u(parent_data[:HEADER_SIZE]))
+ self._prev_hash, parent._prev_hash = parent._prev_hash, self._prev_hash
+ # parent's new name
+ try:
+ os.rename(child_old_name, parent.path())
+ except OSError:
+ os.remove(parent.path())
+ os.rename(child_old_name, parent.path())
+ self.update_size()
+ parent.update_size()
# update pointers
- with blockchains_lock:
- blockchains[self.forkpoint] = self
- blockchains[parent.forkpoint] = parent
+ blockchains.pop(child_old_id, None)
+ blockchains.pop(parent_old_id, None)
+ blockchains[self.get_id()] = self
+ blockchains[parent.get_id()] = parent
+ return True
+
+ def get_id(self) -> str:
+ return self._forkpoint_hash
def assert_headers_file_available(self, path):
if os.path.exists(path):
@@ -283,19 +377,19 @@ class Blockchain(util.PrintError):
else:
raise FileNotFoundError('Cannot find headers file but headers_dir is there. Should be at {}'.format(path))
+ @with_lock
def write(self, data: bytes, offset: int, truncate: bool=True) -> None:
filename = self.path()
- with self.lock:
- self.assert_headers_file_available(filename)
- with open(filename, 'rb+') as f:
- if truncate and offset != self._size * HEADER_SIZE:
- f.seek(offset)
- f.truncate()
+ self.assert_headers_file_available(filename)
+ with open(filename, 'rb+') as f:
+ if truncate and offset != self._size * HEADER_SIZE:
f.seek(offset)
- f.write(data)
- f.flush()
- os.fsync(f.fileno())
- self.update_size()
+ f.truncate()
+ f.seek(offset)
+ f.write(data)
+ f.flush()
+ os.fsync(f.fileno())
+ self.update_size()
@with_lock
def save_header(self, header: dict) -> None:
@@ -307,12 +401,12 @@ class Blockchain(util.PrintError):
self.write(data, delta*HEADER_SIZE)
self.swap_with_parent()
+ @with_lock
def read_header(self, height: int) -> Optional[dict]:
- assert self.parent_id != self.forkpoint
if height < 0:
return
if height < self.forkpoint:
- return self.parent().read_header(height)
+ return self.parent.read_header(height)
if height > self.height():
return
delta = height - self.forkpoint
@@ -372,16 +466,18 @@ class Blockchain(util.PrintError):
new_target = self.bits_to_target(self.target_to_bits(new_target))
return new_target
- def bits_to_target(self, bits: int) -> int:
+ @classmethod
+ def bits_to_target(cls, bits: int) -> int:
bitsN = (bits >> 24) & 0xff
- if not (bitsN >= 0x03 and bitsN <= 0x1d):
+ if not (0x03 <= bitsN <= 0x1d):
raise Exception("First part of bits should be in [0x03, 0x1d]")
bitsBase = bits & 0xffffff
- if not (bitsBase >= 0x8000 and bitsBase <= 0x7fffff):
+ if not (0x8000 <= bitsBase <= 0x7fffff):
raise Exception("Second part of bits should be in [0x8000, 0x7fffff]")
return bitsBase << (8 * (bitsN-3))
- def target_to_bits(self, target: int) -> int:
+ @classmethod
+ def target_to_bits(cls, target: int) -> int:
c = ("%064x" % target)[2:]
while c[:2] == '00' and len(c) > 6:
c = c[2:]
@@ -391,6 +487,40 @@ class Blockchain(util.PrintError):
bitsBase >>= 8
return bitsN << 24 | bitsBase
+ def chainwork_of_header_at_height(self, height: int) -> int:
+ """work done by single header at given height"""
+ chunk_idx = height // 2016 - 1
+ target = self.get_target(chunk_idx)
+ work = ((2 ** 256 - target - 1) // (target + 1)) + 1
+ return work
+
+ @with_lock
+ def get_chainwork(self, height=None) -> int:
+ if height is None:
+ height = max(0, self.height())
+ if constants.net.TESTNET:
+ # On testnet/regtest, difficulty works somewhat different.
+ # It's out of scope to properly implement that.
+ return height
+ last_retarget = height // 2016 * 2016 - 1
+ cached_height = last_retarget
+ while _CHAINWORK_CACHE.get(self.get_hash(cached_height)) is None:
+ if cached_height <= -1:
+ break
+ cached_height -= 2016
+ assert cached_height >= -1, cached_height
+ running_total = _CHAINWORK_CACHE[self.get_hash(cached_height)]
+ while cached_height < last_retarget:
+ cached_height += 2016
+ work_in_single_header = self.chainwork_of_header_at_height(cached_height)
+ work_in_chunk = 2016 * work_in_single_header
+ running_total += work_in_chunk
+ _CHAINWORK_CACHE[self.get_hash(cached_height)] = running_total
+ cached_height += 2016
+ work_in_single_header = self.chainwork_of_header_at_height(cached_height)
+ work_in_last_partial_chunk = (height % 2016 + 1) * work_in_single_header
+ return running_total + work_in_last_partial_chunk
+
def can_connect(self, header: dict, check_height: bool=True) -> bool:
if header is None:
return False
@@ -417,6 +547,7 @@ class Blockchain(util.PrintError):
return True
def connect_chunk(self, idx: int, hexdata: str) -> bool:
+ assert idx >= 0, idx
try:
data = bfh(hexdata)
self.verify_chunk(idx, data)
@@ -424,7 +555,7 @@ class Blockchain(util.PrintError):
self.save_chunk(idx, data)
return True
except BaseException as e:
- self.print_error('verify_chunk %d failed'%idx, str(e))
+ self.print_error(f'verify_chunk idx {idx} failed: {repr(e)}')
return False
def get_checkpoints(self):
diff --git a/electrum/gui/kivy/main_window.py b/electrum/gui/kivy/main_window.py
@@ -126,10 +126,12 @@ class ElectrumWindow(App):
chains = self.network.get_blockchains()
def cb(name):
with blockchain.blockchains_lock: blockchain_items = list(blockchain.blockchains.items())
- for index, b in blockchain_items:
+ for chain_id, b in blockchain_items:
if name == b.get_name():
- self.network.run_from_another_thread(self.network.follow_chain_given_id(index))
- names = [blockchain.blockchains[b].get_name() for b in chains]
+ self.network.run_from_another_thread(self.network.follow_chain_given_id(chain_id))
+ chain_objects = [blockchain.blockchains.get(chain_id) for chain_id in chains]
+ chain_objects = filter(lambda b: b is not None, chain_objects)
+ names = [b.get_name() for b in chain_objects]
if len(names) > 1:
cur_chain = self.network.blockchain().get_name()
ChoiceDialog(_('Choose your chain'), names, cur_chain, cb).open()
diff --git a/electrum/gui/qt/network_dialog.py b/electrum/gui/qt/network_dialog.py
@@ -82,8 +82,8 @@ class NodesListWidget(QTreeWidget):
server = item.data(1, Qt.UserRole)
menu.addAction(_("Use as server"), lambda: self.parent.follow_server(server))
else:
- index = item.data(1, Qt.UserRole)
- menu.addAction(_("Follow this branch"), lambda: self.parent.follow_branch(index))
+ chain_id = item.data(1, Qt.UserRole)
+ menu.addAction(_("Follow this branch"), lambda: self.parent.follow_branch(chain_id))
menu.exec_(self.viewport().mapToGlobal(position))
def keyPressEvent(self, event):
@@ -103,22 +103,23 @@ class NodesListWidget(QTreeWidget):
self.addChild = self.addTopLevelItem
chains = network.get_blockchains()
n_chains = len(chains)
- for k, items in chains.items():
- b = blockchain.blockchains[k]
+ for chain_id, interfaces in chains.items():
+ b = blockchain.blockchains.get(chain_id)
+ if b is None: continue
name = b.get_name()
- if n_chains >1:
+ if n_chains > 1:
x = QTreeWidgetItem([name + '@%d'%b.get_max_forkpoint(), '%d'%b.height()])
x.setData(0, Qt.UserRole, 1)
- x.setData(1, Qt.UserRole, b.forkpoint)
+ x.setData(1, Qt.UserRole, b.get_id())
else:
x = self
- for i in items:
+ for i in interfaces:
star = ' *' if i == network.interface else ''
item = QTreeWidgetItem([i.host + star, '%d'%i.tip])
item.setData(0, Qt.UserRole, 0)
item.setData(1, Qt.UserRole, i.server)
x.addChild(item)
- if n_chains>1:
+ if n_chains > 1:
self.addTopLevelItem(x)
x.setExpanded(True)
@@ -410,8 +411,8 @@ class NetworkChoiceLayout(object):
self.set_protocol(p)
self.set_server()
- def follow_branch(self, index):
- self.network.run_from_another_thread(self.network.follow_chain_given_id(index))
+ def follow_branch(self, chain_id):
+ self.network.run_from_another_thread(self.network.follow_chain_given_id(chain_id))
self.update()
def follow_server(self, server):
diff --git a/electrum/interface.py b/electrum/interface.py
@@ -28,7 +28,7 @@ import ssl
import sys
import traceback
import asyncio
-from typing import Tuple, Union, List, TYPE_CHECKING
+from typing import Tuple, Union, List, TYPE_CHECKING, Optional
from collections import defaultdict
import aiorpcx
@@ -140,14 +140,14 @@ def serialize_server(host: str, port: Union[str, int], protocol: str) -> str:
class Interface(PrintError):
verbosity_filter = 'i'
- def __init__(self, network: 'Network', server: str, config_path, proxy: dict):
+ def __init__(self, network: 'Network', server: str, proxy: Optional[dict]):
self.ready = asyncio.Future()
self.got_disconnected = asyncio.Future()
self.server = server
self.host, self.port, self.protocol = deserialize_server(self.server)
self.port = int(self.port)
- self.config_path = config_path
- self.cert_path = os.path.join(self.config_path, 'certs', self.host)
+ assert network.config.path
+ self.cert_path = os.path.join(network.config.path, 'certs', self.host)
self.blockchain = None
self._requested_chunks = set()
self.network = network
@@ -281,7 +281,7 @@ class Interface(PrintError):
assert self.tip_header
chain = blockchain.check_header(self.tip_header)
if not chain:
- self.blockchain = blockchain.blockchains[0]
+ self.blockchain = blockchain.get_best_chain()
else:
self.blockchain = chain
assert self.blockchain is not None
@@ -502,7 +502,7 @@ class Interface(PrintError):
# bad_header connects to good_header; bad_header itself is NOT in self.blockchain.
bh = self.blockchain.height()
- assert bh >= good
+ assert bh >= good, (bh, good)
if bh == good:
height = good + 1
self.print_error("catching up from {}".format(height))
@@ -510,53 +510,12 @@ class Interface(PrintError):
# this is a new fork we don't yet have
height = bad + 1
- branch = blockchain.blockchains.get(bad)
- if branch is not None:
- # Conflict!! As our fork handling is not completely general,
- # we need to delete another fork to save this one.
- # Note: This could be a potential DOS vector against Electrum.
- # However, mining blocks that satisfy the difficulty requirements
- # is assumed to be expensive; especially as forks below the max
- # checkpoint are ignored.
- self.print_error("new fork at bad height {}. conflict!!".format(bad))
- assert self.blockchain != branch
- ismocking = type(branch) is dict
- if ismocking:
- self.print_error("TODO replace blockchain")
- return 'fork_conflict', height
- self.print_error('forkpoint conflicts with existing fork', branch.path())
- self._raise_if_fork_conflicts_with_default_server(branch)
- await self._disconnect_from_interfaces_on_conflicting_blockchain(branch)
- branch.write(b'', 0)
- branch.save_header(bad_header)
- self.blockchain = branch
- return 'fork_conflict', height
- else:
- # No conflict. Just save the new fork.
- self.print_error("new fork at bad height {}. NO conflict.".format(bad))
- forkfun = self.blockchain.fork if 'mock' not in bad_header else bad_header['mock']['fork']
- b = forkfun(bad_header)
- with blockchain.blockchains_lock:
- assert bad not in blockchain.blockchains, (bad, list(blockchain.blockchains))
- blockchain.blockchains[bad] = b
- self.blockchain = b
- assert b.forkpoint == bad
- return 'fork_noconflict', height
-
- def _raise_if_fork_conflicts_with_default_server(self, chain_to_delete: Blockchain) -> None:
- main_interface = self.network.interface
- if not main_interface: return
- if main_interface == self: return
- chain_of_default_server = main_interface.blockchain
- if not chain_of_default_server: return
- if chain_to_delete == chain_of_default_server:
- raise GracefulDisconnect('refusing to overwrite blockchain of default server')
-
- async def _disconnect_from_interfaces_on_conflicting_blockchain(self, chain: Blockchain) -> None:
- ifaces = await self.network.disconnect_from_interfaces_on_given_blockchain(chain)
- if not ifaces: return
- servers = [interface.server for interface in ifaces]
- self.print_error("forcing disconnect of other interfaces: {}".format(servers))
+ self.print_error(f"new fork at bad height {bad}")
+ forkfun = self.blockchain.fork if 'mock' not in bad_header else bad_header['mock']['fork']
+ b = forkfun(bad_header) # type: Blockchain
+ self.blockchain = b
+ assert b.forkpoint == bad
+ return 'fork', height
async def _search_headers_backwards(self, height, header):
async def iterate():
diff --git a/electrum/network.py b/electrum/network.py
@@ -177,10 +177,10 @@ class Network(PrintError):
if config is None:
config = {} # Do not use mutables as default values!
self.config = SimpleConfig(config) if isinstance(config, dict) else config # type: SimpleConfig
- blockchain.blockchains = blockchain.read_blockchains(self.config)
- self.print_error("blockchains", list(blockchain.blockchains))
+ blockchain.read_blockchains(self.config)
+ self.print_error("blockchains", list(map(lambda b: b.forkpoint, blockchain.blockchains.values())))
self._blockchain_preferred_block = self.config.get('blockchain_preferred_block', None) # type: Optional[Dict]
- self._blockchain_index = 0
+ self._blockchain = blockchain.get_best_chain()
# Server for addresses and transactions
self.default_server = self.config.get('server', None)
# Sanitize default server
@@ -559,17 +559,24 @@ class Network(PrintError):
filtered = list(filter(lambda iface: iface.blockchain.check_hash(pref_height, pref_hash),
interfaces))
if filtered:
+ self.print_error("switching to preferred fork")
chosen_iface = random.choice(filtered)
await self.switch_to_interface(chosen_iface.server)
return
- # try to switch to longest chain
- if self.blockchain().parent_id is None:
- return # already on longest chain
- filtered = list(filter(lambda iface: iface.blockchain.parent_id is None,
+ else:
+ self.print_error("tried to switch to preferred fork but no interfaces are on it")
+ # try to switch to best chain
+ if self.blockchain().parent is None:
+ return # already on best chain
+ filtered = list(filter(lambda iface: iface.blockchain.parent is None,
interfaces))
if filtered:
+ self.print_error("switching to best chain")
chosen_iface = random.choice(filtered)
await self.switch_to_interface(chosen_iface.server)
+ else:
+ # FIXME switch to best available?
+ self.print_error("tried to switch to best chain but no interfaces are on it")
async def switch_to_interface(self, server: str):
"""Switch to server as our main interface. If no connection exists,
@@ -637,7 +644,7 @@ class Network(PrintError):
@ignore_exceptions # do not kill main_taskgroup
@log_exceptions
async def _run_new_interface(self, server):
- interface = Interface(self, server, self.config.path, self.proxy)
+ interface = Interface(self, server, self.proxy)
timeout = 10 if not self.proxy else 20
try:
await asyncio.wait_for(interface.ready, timeout)
@@ -661,7 +668,7 @@ class Network(PrintError):
self.trigger_callback('network_updated')
async def _init_headers_file(self):
- b = blockchain.blockchains[0]
+ b = blockchain.get_best_chain()
filename = b.path()
length = HEADER_SIZE * len(constants.net.CHECKPOINTS) * 2016
if not os.path.exists(filename) or os.path.getsize(filename) < length:
@@ -739,8 +746,8 @@ class Network(PrintError):
def blockchain(self) -> Blockchain:
interface = self.interface
if interface and interface.blockchain is not None:
- self._blockchain_index = interface.blockchain.forkpoint
- return blockchain.blockchains[self._blockchain_index]
+ self._blockchain = interface.blockchain
+ return self._blockchain
def get_blockchains(self):
out = {} # blockchain_id -> list(interfaces)
@@ -752,13 +759,6 @@ class Network(PrintError):
out[chain_id] = r
return out
- async def disconnect_from_interfaces_on_given_blockchain(self, chain: Blockchain) -> Sequence[Interface]:
- chain_id = chain.forkpoint
- ifaces = self.get_blockchains().get(chain_id) or []
- for interface in ifaces:
- await self.connection_down(interface.server)
- return ifaces
-
def _set_preferred_chain(self, chain: Blockchain):
height = chain.get_max_forkpoint()
header_hash = chain.get_hash(height)
@@ -768,7 +768,7 @@ class Network(PrintError):
}
self.config.set_key('blockchain_preferred_block', self._blockchain_preferred_block)
- async def follow_chain_given_id(self, chain_id: int) -> None:
+ async def follow_chain_given_id(self, chain_id: str) -> None:
bc = blockchain.blockchains.get(chain_id)
if not bc:
raise Exception('blockchain {} not found'.format(chain_id))
diff --git a/electrum/storage.py b/electrum/storage.py
@@ -125,7 +125,7 @@ class JsonDB(PrintError):
# perform atomic write on POSIX systems
try:
os.rename(temp_path, self.path)
- except:
+ except OSError:
os.remove(self.path)
os.rename(temp_path, self.path)
os.chmod(self.path, mode)
diff --git a/electrum/tests/test_blockchain.py b/electrum/tests/test_blockchain.py
@@ -0,0 +1,239 @@
+import shutil
+import tempfile
+import os
+
+from electrum import constants, blockchain
+from electrum.simple_config import SimpleConfig
+from electrum.blockchain import Blockchain, deserialize_header, hash_header
+from electrum.util import bh2u, bfh, make_dir
+
+from . import SequentialTestCase
+
+
+class TestBlockchain(SequentialTestCase):
+
+ HEADERS = {
+ 'A': deserialize_header(bfh("0100000000000000000000000000000000000000000000000000000000000000000000003ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4adae5494dffff7f2002000000"), 0),
+ 'B': deserialize_header(bfh("0000002006226e46111a0b59caaf126043eb5bbf28c34f3a5e332a1fc7b2b73cf188910f186c8dfd970a4545f79916bc1d75c9d00432f57c89209bf3bb115b7612848f509c25f45bffff7f2000000000"), 1),
+ 'C': deserialize_header(bfh("00000020686bdfc6a3db73d5d93e8c9663a720a26ecb1ef20eb05af11b36cdbc57c19f7ebf2cbf153013a1c54abaf70e95198fcef2f3059cc6b4d0f7e876808e7d24d11cc825f45bffff7f2000000000"), 2),
+ 'D': deserialize_header(bfh("00000020122baa14f3ef54985ae546d1611559e3f487bd2a0f46e8dbb52fbacc9e237972e71019d7feecd9b8596eca9a67032c5f4641b23b5d731dc393e37de7f9c2f299e725f45bffff7f2000000000"), 3),
+ 'E': deserialize_header(bfh("00000020f8016f7ef3a17d557afe05d4ea7ab6bde1b2247b7643896c1b63d43a1598b747a3586da94c71753f27c075f57f44faf913c31177a0957bbda42e7699e3a2141aed25f45bffff7f2001000000"), 4),
+ 'F': deserialize_header(bfh("000000201d589c6643c1d121d73b0573e5ee58ab575b8fdf16d507e7e915c5fbfbbfd05e7aee1d692d1615c3bdf52c291032144ce9e3b258a473c17c745047f3431ff8e2ee25f45bffff7f2000000000"), 5),
+ 'O': deserialize_header(bfh("00000020b833ed46eea01d4c980f59feee44a66aa1162748b6801029565d1466790c405c3a141ce635cbb1cd2b3a4fcdd0a3380517845ba41736c82a79cab535d31128066526f45bffff7f2001000000"), 6),
+ 'P': deserialize_header(bfh("00000020abe8e119d1877c9dc0dc502d1a253fb9a67967c57732d2f71ee0280e8381ff0a9690c2fe7c1a4450c74dc908fe94dd96c3b0637d51475e9e06a78e944a0c7fe28126f45bffff7f2000000000"), 7),
+ 'Q': deserialize_header(bfh("000000202ce41d94eb70e1518bc1f72523f84a903f9705d967481e324876e1f8cf4d3452148be228a4c3f2061bafe7efdfc4a8d5a94759464b9b5c619994d45dfcaf49e1a126f45bffff7f2000000000"), 8),
+ 'R': deserialize_header(bfh("00000020552755b6c59f3d51e361d16281842a4e166007799665b5daed86a063dd89857415681cb2d00ff889193f6a68a93f5096aeb2d84ca0af6185a462555822552221a626f45bffff7f2000000000"), 9),
+ 'S': deserialize_header(bfh("00000020a13a491cbefc93cd1bb1938f19957e22a134faf14c7dee951c45533e2c750f239dc087fc977b06c24a69c682d1afd1020e6dc1f087571ccec66310a786e1548fab26f45bffff7f2000000000"), 10),
+ 'T': deserialize_header(bfh("00000020dbf3a9b55dfefbaf8b6e43a89cf833fa2e208bbc0c1c5d76c0d71b9e4a65337803b243756c25053253aeda309604363460a3911015929e68705bd89dff6fe064b026f45bffff7f2002000000"), 11),
+ 'U': deserialize_header(bfh("000000203d0932b3b0c78eccb39a595a28ae4a7c966388648d7783fd1305ec8d40d4fe5fd67cb902a7d807cee7676cb543feec3e053aa824d5dfb528d5b94f9760313d9db726f45bffff7f2001000000"), 12),
+ 'G': deserialize_header(bfh("00000020b833ed46eea01d4c980f59feee44a66aa1162748b6801029565d1466790c405c3a141ce635cbb1cd2b3a4fcdd0a3380517845ba41736c82a79cab535d31128066928f45bffff7f2001000000"), 6),
+ 'H': deserialize_header(bfh("00000020e19e687f6e7f83ca394c114144dbbbc4f3f9c9450f66331a125413702a2e1a719690c2fe7c1a4450c74dc908fe94dd96c3b0637d51475e9e06a78e944a0c7fe26a28f45bffff7f2002000000"), 7),
+ 'I': deserialize_header(bfh("0000002009dcb3b158293c89d7cf7ceeb513add122ebc3880a850f47afbb2747f5e48c54148be228a4c3f2061bafe7efdfc4a8d5a94759464b9b5c619994d45dfcaf49e16a28f45bffff7f2000000000"), 8),
+ 'J': deserialize_header(bfh("000000206a65f3bdd3374a5a6c4538008ba0b0a560b8566291f9ef4280ab877627a1742815681cb2d00ff889193f6a68a93f5096aeb2d84ca0af6185a462555822552221c928f45bffff7f2000000000"), 9),
+ 'K': deserialize_header(bfh("00000020bb3b421653548991998f96f8ba486b652fdb07ca16e9cee30ece033547cd1a6e9dc087fc977b06c24a69c682d1afd1020e6dc1f087571ccec66310a786e1548fca28f45bffff7f2000000000"), 10),
+ 'L': deserialize_header(bfh("00000020c391d74d37c24a130f4bf4737932bdf9e206dd4fad22860ec5408978eb55d46303b243756c25053253aeda309604363460a3911015929e68705bd89dff6fe064ca28f45bffff7f2000000000"), 11),
+ 'M': deserialize_header(bfh("000000206a65f3bdd3374a5a6c4538008ba0b0a560b8566291f9ef4280ab877627a1742815681cb2d00ff889193f6a68a93f5096aeb2d84ca0af6185a4625558225522214229f45bffff7f2000000000"), 9),
+ 'N': deserialize_header(bfh("00000020383dab38b57f98aa9b4f0d5ff868bc674b4828d76766bf048296f4c45fff680a9dc087fc977b06c24a69c682d1afd1020e6dc1f087571ccec66310a786e1548f4329f45bffff7f2003000000"), 10),
+ 'X': deserialize_header(bfh("0000002067f1857f54b7fef732cb4940f7d1b339472b3514660711a820330fd09d8fba6b03b243756c25053253aeda309604363460a3911015929e68705bd89dff6fe0649b29f45bffff7f2002000000"), 11),
+ 'Y': deserialize_header(bfh("00000020db33c9768a9e5f7c37d0f09aad88d48165946c87d08f7d63793f07b5c08c527fd67cb902a7d807cee7676cb543feec3e053aa824d5dfb528d5b94f9760313d9d9b29f45bffff7f2000000000"), 12),
+ 'Z': deserialize_header(bfh("0000002047822b67940e337fda38be6f13390b3596e4dea2549250256879722073824e7f0f2596c29203f8a0f71ae94193092dc8f113be3dbee4579f1e649fa3d6dcc38c622ef45bffff7f2003000000"), 13),
+ }
+ # tree of headers:
+ # - M <- N <- X <- Y <- Z
+ # /
+ # - G <- H <- I <- J <- K <- L
+ # /
+ # A <- B <- C <- D <- E <- F <- O <- P <- Q <- R <- S <- T <- U
+
+ @classmethod
+ def setUpClass(cls):
+ super().setUpClass()
+ constants.set_regtest()
+
+ @classmethod
+ def tearDownClass(cls):
+ super().tearDownClass()
+ constants.set_mainnet()
+
+ def setUp(self):
+ super().setUp()
+ self.data_dir = tempfile.mkdtemp()
+ make_dir(os.path.join(self.data_dir, 'forks'))
+ self.config = SimpleConfig({'electrum_path': self.data_dir})
+ blockchain.blockchains = {}
+
+ def tearDown(self):
+ super().tearDown()
+ shutil.rmtree(self.data_dir)
+
+ def _append_header(self, chain: Blockchain, header: dict):
+ self.assertTrue(chain.can_connect(header))
+ chain.save_header(header)
+
+ def test_forking_and_swapping(self):
+ blockchain.blockchains[constants.net.GENESIS] = chain_u = Blockchain(
+ config=self.config, forkpoint=0, parent=None,
+ forkpoint_hash=constants.net.GENESIS, prev_hash=None)
+ open(chain_u.path(), 'w+').close()
+
+ self._append_header(chain_u, self.HEADERS['A'])
+ self._append_header(chain_u, self.HEADERS['B'])
+ self._append_header(chain_u, self.HEADERS['C'])
+ self._append_header(chain_u, self.HEADERS['D'])
+ self._append_header(chain_u, self.HEADERS['E'])
+ self._append_header(chain_u, self.HEADERS['F'])
+ self._append_header(chain_u, self.HEADERS['O'])
+ self._append_header(chain_u, self.HEADERS['P'])
+ self._append_header(chain_u, self.HEADERS['Q'])
+ self._append_header(chain_u, self.HEADERS['R'])
+
+ chain_l = chain_u.fork(self.HEADERS['G'])
+ self._append_header(chain_l, self.HEADERS['H'])
+ self._append_header(chain_l, self.HEADERS['I'])
+ self._append_header(chain_l, self.HEADERS['J'])
+
+ # do checks
+ self.assertEqual(2, len(blockchain.blockchains))
+ self.assertEqual(1, len(os.listdir(os.path.join(self.data_dir, "forks"))))
+ self.assertEqual(0, chain_u.forkpoint)
+ self.assertEqual(None, chain_u.parent)
+ self.assertEqual(constants.net.GENESIS, chain_u._forkpoint_hash)
+ self.assertEqual(None, chain_u._prev_hash)
+ self.assertEqual(os.path.join(self.data_dir, "blockchain_headers"), chain_u.path())
+ self.assertEqual(10 * 80, os.stat(chain_u.path()).st_size)
+ self.assertEqual(6, chain_l.forkpoint)
+ self.assertEqual(chain_u, chain_l.parent)
+ self.assertEqual(hash_header(self.HEADERS['G']), chain_l._forkpoint_hash)
+ self.assertEqual(hash_header(self.HEADERS['F']), chain_l._prev_hash)
+ self.assertEqual(os.path.join(self.data_dir, "forks", "fork2_6_5c400c7966145d56291080b6482716a16aa644eefe590f984c1da0ee46ed33b8_711a2e2a701354121a33660f45c9f9f3c4bbdb4441114c39ca837f6e7f689ee1"), chain_l.path())
+ self.assertEqual(4 * 80, os.stat(chain_l.path()).st_size)
+
+ self._append_header(chain_l, self.HEADERS['K'])
+
+ # chains were swapped, do checks
+ self.assertEqual(2, len(blockchain.blockchains))
+ self.assertEqual(1, len(os.listdir(os.path.join(self.data_dir, "forks"))))
+ self.assertEqual(6, chain_u.forkpoint)
+ self.assertEqual(chain_l, chain_u.parent)
+ self.assertEqual(hash_header(self.HEADERS['O']), chain_u._forkpoint_hash)
+ self.assertEqual(hash_header(self.HEADERS['F']), chain_u._prev_hash)
+ self.assertEqual(os.path.join(self.data_dir, "forks", "fork2_6_5c400c7966145d56291080b6482716a16aa644eefe590f984c1da0ee46ed33b8_aff81830e28e01ef7d23277c56779a6b93f251a2d50dcc09d7c87d119e1e8ab"), chain_u.path())
+ self.assertEqual(4 * 80, os.stat(chain_u.path()).st_size)
+ self.assertEqual(0, chain_l.forkpoint)
+ self.assertEqual(None, chain_l.parent)
+ self.assertEqual(constants.net.GENESIS, chain_l._forkpoint_hash)
+ self.assertEqual(None, chain_l._prev_hash)
+ self.assertEqual(os.path.join(self.data_dir, "blockchain_headers"), chain_l.path())
+ self.assertEqual(11 * 80, os.stat(chain_l.path()).st_size)
+ for b in (chain_u, chain_l):
+ self.assertTrue(all([b.can_connect(b.read_header(i), False) for i in range(b.height())]))
+
+ self._append_header(chain_u, self.HEADERS['S'])
+ self._append_header(chain_u, self.HEADERS['T'])
+ self._append_header(chain_u, self.HEADERS['U'])
+ self._append_header(chain_l, self.HEADERS['L'])
+
+ chain_z = chain_l.fork(self.HEADERS['M'])
+ self._append_header(chain_z, self.HEADERS['N'])
+ self._append_header(chain_z, self.HEADERS['X'])
+ self._append_header(chain_z, self.HEADERS['Y'])
+ self._append_header(chain_z, self.HEADERS['Z'])
+
+ # chain_z became best chain, do checks
+ self.assertEqual(3, len(blockchain.blockchains))
+ self.assertEqual(2, len(os.listdir(os.path.join(self.data_dir, "forks"))))
+ self.assertEqual(0, chain_z.forkpoint)
+ self.assertEqual(None, chain_z.parent)
+ self.assertEqual(constants.net.GENESIS, chain_z._forkpoint_hash)
+ self.assertEqual(None, chain_z._prev_hash)
+ self.assertEqual(os.path.join(self.data_dir, "blockchain_headers"), chain_z.path())
+ self.assertEqual(14 * 80, os.stat(chain_z.path()).st_size)
+ self.assertEqual(9, chain_l.forkpoint)
+ self.assertEqual(chain_z, chain_l.parent)
+ self.assertEqual(hash_header(self.HEADERS['J']), chain_l._forkpoint_hash)
+ self.assertEqual(hash_header(self.HEADERS['I']), chain_l._prev_hash)
+ self.assertEqual(os.path.join(self.data_dir, "forks", "fork2_9_2874a1277687ab8042eff9916256b860a5b0a08b0038456c5a4a37d3bdf3656a_6e1acd473503ce0ee3cee916ca07db2f656b48baf8968f999189545316423bbb"), chain_l.path())
+ self.assertEqual(3 * 80, os.stat(chain_l.path()).st_size)
+ self.assertEqual(6, chain_u.forkpoint)
+ self.assertEqual(chain_z, chain_u.parent)
+ self.assertEqual(hash_header(self.HEADERS['O']), chain_u._forkpoint_hash)
+ self.assertEqual(hash_header(self.HEADERS['F']), chain_u._prev_hash)
+ self.assertEqual(os.path.join(self.data_dir, "forks", "fork2_6_5c400c7966145d56291080b6482716a16aa644eefe590f984c1da0ee46ed33b8_aff81830e28e01ef7d23277c56779a6b93f251a2d50dcc09d7c87d119e1e8ab"), chain_u.path())
+ self.assertEqual(7 * 80, os.stat(chain_u.path()).st_size)
+ for b in (chain_u, chain_l, chain_z):
+ self.assertTrue(all([b.can_connect(b.read_header(i), False) for i in range(b.height())]))
+
+ self.assertEqual(constants.net.GENESIS, chain_z.get_hash(0))
+ self.assertEqual(hash_header(self.HEADERS['F']), chain_z.get_hash(5))
+ self.assertEqual(hash_header(self.HEADERS['G']), chain_z.get_hash(6))
+ self.assertEqual(hash_header(self.HEADERS['I']), chain_z.get_hash(8))
+ self.assertEqual(hash_header(self.HEADERS['M']), chain_z.get_hash(9))
+ self.assertEqual(hash_header(self.HEADERS['Z']), chain_z.get_hash(13))
+
+ def test_doing_multiple_swaps_after_single_new_header(self):
+ blockchain.blockchains[constants.net.GENESIS] = chain_u = Blockchain(
+ config=self.config, forkpoint=0, parent=None,
+ forkpoint_hash=constants.net.GENESIS, prev_hash=None)
+ open(chain_u.path(), 'w+').close()
+
+ self._append_header(chain_u, self.HEADERS['A'])
+ self._append_header(chain_u, self.HEADERS['B'])
+ self._append_header(chain_u, self.HEADERS['C'])
+ self._append_header(chain_u, self.HEADERS['D'])
+ self._append_header(chain_u, self.HEADERS['E'])
+ self._append_header(chain_u, self.HEADERS['F'])
+ self._append_header(chain_u, self.HEADERS['O'])
+ self._append_header(chain_u, self.HEADERS['P'])
+ self._append_header(chain_u, self.HEADERS['Q'])
+ self._append_header(chain_u, self.HEADERS['R'])
+ self._append_header(chain_u, self.HEADERS['S'])
+
+ self.assertEqual(1, len(blockchain.blockchains))
+ self.assertEqual(0, len(os.listdir(os.path.join(self.data_dir, "forks"))))
+
+ chain_l = chain_u.fork(self.HEADERS['G'])
+ self._append_header(chain_l, self.HEADERS['H'])
+ self._append_header(chain_l, self.HEADERS['I'])
+ self._append_header(chain_l, self.HEADERS['J'])
+ self._append_header(chain_l, self.HEADERS['K'])
+ # now chain_u is best chain, but it's tied with chain_l
+
+ self.assertEqual(2, len(blockchain.blockchains))
+ self.assertEqual(1, len(os.listdir(os.path.join(self.data_dir, "forks"))))
+
+ chain_z = chain_l.fork(self.HEADERS['M'])
+ self._append_header(chain_z, self.HEADERS['N'])
+ self._append_header(chain_z, self.HEADERS['X'])
+
+ self.assertEqual(3, len(blockchain.blockchains))
+ self.assertEqual(2, len(os.listdir(os.path.join(self.data_dir, "forks"))))
+
+ # chain_z became best chain, do checks
+ self.assertEqual(0, chain_z.forkpoint)
+ self.assertEqual(None, chain_z.parent)
+ self.assertEqual(constants.net.GENESIS, chain_z._forkpoint_hash)
+ self.assertEqual(None, chain_z._prev_hash)
+ self.assertEqual(os.path.join(self.data_dir, "blockchain_headers"), chain_z.path())
+ self.assertEqual(12 * 80, os.stat(chain_z.path()).st_size)
+ self.assertEqual(9, chain_l.forkpoint)
+ self.assertEqual(chain_z, chain_l.parent)
+ self.assertEqual(hash_header(self.HEADERS['J']), chain_l._forkpoint_hash)
+ self.assertEqual(hash_header(self.HEADERS['I']), chain_l._prev_hash)
+ self.assertEqual(os.path.join(self.data_dir, "forks", "fork2_9_2874a1277687ab8042eff9916256b860a5b0a08b0038456c5a4a37d3bdf3656a_6e1acd473503ce0ee3cee916ca07db2f656b48baf8968f999189545316423bbb"), chain_l.path())
+ self.assertEqual(2 * 80, os.stat(chain_l.path()).st_size)
+ self.assertEqual(6, chain_u.forkpoint)
+ self.assertEqual(chain_z, chain_u.parent)
+ self.assertEqual(hash_header(self.HEADERS['O']), chain_u._forkpoint_hash)
+ self.assertEqual(hash_header(self.HEADERS['F']), chain_u._prev_hash)
+ self.assertEqual(os.path.join(self.data_dir, "forks", "fork2_6_5c400c7966145d56291080b6482716a16aa644eefe590f984c1da0ee46ed33b8_aff81830e28e01ef7d23277c56779a6b93f251a2d50dcc09d7c87d119e1e8ab"), chain_u.path())
+ self.assertEqual(5 * 80, os.stat(chain_u.path()).st_size)
+
+ self.assertEqual(constants.net.GENESIS, chain_z.get_hash(0))
+ self.assertEqual(hash_header(self.HEADERS['F']), chain_z.get_hash(5))
+ self.assertEqual(hash_header(self.HEADERS['G']), chain_z.get_hash(6))
+ self.assertEqual(hash_header(self.HEADERS['I']), chain_z.get_hash(8))
+ self.assertEqual(hash_header(self.HEADERS['M']), chain_z.get_hash(9))
+ self.assertEqual(hash_header(self.HEADERS['X']), chain_z.get_hash(11))
+
+ for b in (chain_u, chain_l, chain_z):
+ self.assertTrue(all([b.can_connect(b.read_header(i), False) for i in range(b.height())]))
diff --git a/electrum/tests/test_network.py b/electrum/tests/test_network.py
@@ -6,6 +6,9 @@ from electrum import constants
from electrum.simple_config import SimpleConfig
from electrum import blockchain
from electrum.interface import Interface
+from electrum.crypto import sha256
+from electrum.util import bh2u
+
class MockTaskGroup:
async def spawn(self, x): return
@@ -17,10 +20,14 @@ class MockNetwork:
class MockInterface(Interface):
def __init__(self, config):
self.config = config
- super().__init__(MockNetwork(), 'mock-server:50000:t', self.config.electrum_path(), None)
+ network = MockNetwork()
+ network.config = config
+ super().__init__(network, 'mock-server:50000:t', None)
self.q = asyncio.Queue()
- self.blockchain = blockchain.Blockchain(self.config, 2002, None)
+ self.blockchain = blockchain.Blockchain(config=self.config, forkpoint=0,
+ parent=None, forkpoint_hash=constants.net.GENESIS, prev_hash=None)
self.tip = 12
+ self.blockchain._size = self.tip + 1
async def get_block_header(self, height, assert_mode):
assert self.q.qsize() > 0, (height, assert_mode)
item = await self.q.get()
@@ -56,7 +63,7 @@ class TestNetwork(unittest.TestCase):
self.interface.q.put_nowait({'block_height': 5, 'mock': {'binary':1,'check':lambda x: True, 'connect': lambda x: True}})
self.interface.q.put_nowait({'block_height': 6, 'mock': {'binary':1,'check':lambda x: True, 'connect': lambda x: True}})
ifa = self.interface
- self.assertEqual(('fork_noconflict', 8), asyncio.get_event_loop().run_until_complete(ifa.sync_until(8, next_height=7)))
+ self.assertEqual(('fork', 8), asyncio.get_event_loop().run_until_complete(ifa.sync_until(8, next_height=7)))
self.assertEqual(self.interface.q.qsize(), 0)
def test_fork_conflict(self):
@@ -70,7 +77,7 @@ class TestNetwork(unittest.TestCase):
self.interface.q.put_nowait({'block_height': 5, 'mock': {'binary':1,'check':lambda x: True, 'connect': lambda x: True}})
self.interface.q.put_nowait({'block_height': 6, 'mock': {'binary':1,'check':lambda x: True, 'connect': lambda x: True}})
ifa = self.interface
- self.assertEqual(('fork_conflict', 8), asyncio.get_event_loop().run_until_complete(ifa.sync_until(8, next_height=7)))
+ self.assertEqual(('fork', 8), asyncio.get_event_loop().run_until_complete(ifa.sync_until(8, next_height=7)))
self.assertEqual(self.interface.q.qsize(), 0)
def test_can_connect_during_backward(self):
@@ -87,7 +94,10 @@ class TestNetwork(unittest.TestCase):
self.assertEqual(self.interface.q.qsize(), 0)
def mock_fork(self, bad_header):
- return blockchain.Blockchain(self.config, bad_header['block_height'], None)
+ forkpoint = bad_header['block_height']
+ b = blockchain.Blockchain(config=self.config, forkpoint=forkpoint, parent=None,
+ forkpoint_hash=bh2u(sha256(str(forkpoint))), prev_hash=bh2u(sha256(str(forkpoint-1))))
+ return b
def test_chain_false_during_binary(self):
blockchain.blockchains = {}
diff --git a/electrum/tests/test_wallet.py b/electrum/tests/test_wallet.py
@@ -71,7 +71,6 @@ class TestWalletStorage(WalletTestCase):
storage.put(key, value)
storage.write()
- contents = ""
with open(self.wallet_path, "r") as f:
contents = f.read()
self.assertEqual(some_dict, json.loads(contents))
