async def _fetch_headers_chunks(self, chunks_at_time, local_best_header,
network_best_header):
"""
fetch chunks from local height to network best height, download <chunks_at_time> (>1 is unstable)
"""
i = 0
current_height = local_best_header and local_best_header[
'block_height'] or 0
saving_headers = []
while 1:
Logger.electrum.debug(
'%s headers behind, downloading',
network_best_header['block_height'] - current_height -
len(saving_headers))
local_best_height = local_best_header and local_best_header[
'block_height'] or 0
rewind_from = get_nearest_parent(local_best_height,
2016) // 2016 + i
_from = rewind_from
_to = rewind_from + chunks_at_time
if _from > (network_best_header['block_height'] // 2016):
saved_headers = saving_headers and self.repo.save_headers(
saving_headers) or []
saved_headers and self.set_last_processed_header(
saved_headers[-1])
self.synced = True
return
res = await self.interface.get_headers_in_range_from_chunks(
_from, _to, get_peer=True)
peer, headers = res if res else (None, [])
if not headers:
raise exceptions.NoHeadersException
if local_best_height:
saving_headers = saving_headers + [
h for h in headers if h['block_height'] > local_best_height
]
else:
saving_headers = saving_headers + headers
try:
if not i % 5:
saved_headers = headers and self.repo.save_headers(
saving_headers) or []
saving_headers = []
else:
saved_headers = []
except exceptions.HeadersInconsistencyException:
await peer.disconnect()
raise
Logger.electrum.debug('Fetched %s headers (chunk %s/%s), tot. %s',
len(headers), _from, _to,
len(saving_headers))
if saved_headers:
self.set_last_processed_header(saved_headers[-1])
current_height = self._last_processed_header['block_height']
elif saving_headers:
self.set_last_processed_header(None)
i += 1
async def handle_headers_inconsistency(self):
self.set_last_processed_header(None)
local_best_header = self.repo.get_best_header()
remove_headers_since = get_nearest_parent(
local_best_header['block_height'], 2016)
self.repo.remove_headers_after_height(remove_headers_since)
Logger.electrum.warning(
'Headers inconsistency found, removed headers since %s. Current local: %s',
remove_headers_since, local_best_header['block_height'])
async def _fetch_headers_chunks(self, chunks_at_time, local_best_header,
network_best_header):
"""
fetch chunks from local height to network best height, download <chunks_at_time> (>1 is unstable)
"""
i = 0
current_height = local_best_header and local_best_header[
'block_height'] or 0
while 1:
Logger.electrum.debug(
'Behind of %s blocks, fetching chunks',
network_best_header['block_height'] - current_height)
local_best_height = local_best_header and local_best_header[
'block_height'] or 0
rewind_from = get_nearest_parent(local_best_height,
2016) // 2016 + i
_from = rewind_from
_to = rewind_from + chunks_at_time
if _from > (network_best_header['block_height'] // 2016):
# fixme, move the chunk stuff inside the electrod interface and
# here just "fetch headers". stop.
self.synced = True
return
res = await self.interface.get_headers_in_range_from_chunks(
_from, _to, get_peer=True)
peer, headers = res if res else (None, [])
if not headers:
raise exceptions.NoHeadersException
if local_best_height:
saving_headers = [
h for h in headers if h['block_height'] > local_best_height
]
else:
saving_headers = headers
try:
saved_headers = headers and self.repo.save_headers(
saving_headers)
except exceptions.HeadersInconsistencyException:
await peer.disconnect()
raise
Logger.electrum.debug(
'Fetched %s headers (from chunk %s to chunk %s), saved %s headers of %s',
len(headers), _from, _to, len(saved_headers),
len(saving_headers))
if saved_headers:
self.set_last_processed_header(saved_headers[-1])
current_height = self._last_processed_header['block_height']
else:
self.set_last_processed_header(None)
i += 1