322 lines
14 KiB
Python
322 lines
14 KiB
Python
import collections
|
|
from threading import current_thread, enumerate as threadingEnumerate, RLock
|
|
import time
|
|
|
|
from helper_sql import *
|
|
from singleton import Singleton
|
|
|
|
|
|
@Singleton
|
|
class Inventory(collections.MutableMapping):
|
|
def __init__(self):
|
|
super(self.__class__, self).__init__()
|
|
self._inventory = {} #of objects (like msg payloads and pubkey payloads) Does not include protocol headers (the first 24 bytes of each packet).
|
|
self.numberOfInventoryLookupsPerformed = 0
|
|
self._streams = collections.defaultdict(set) # key = streamNumer, value = a set which holds the inventory object hashes that we are aware of. This is used whenever we receive an inv message from a peer to check to see what items are new to us. We don't delete things out of it; instead, the singleCleaner thread clears and refills it every couple hours.
|
|
self.lock = RLock() # Guarantees that two receiveDataThreads don't receive and process the same message concurrently (probably sent by a malicious individual)
|
|
self.InventoryItem = collections.namedtuple('InventoryItem', 'type stream payload expires tag')
|
|
|
|
def __contains__(self, hash):
|
|
with self.lock:
|
|
self.numberOfInventoryLookupsPerformed += 1
|
|
if hash in self._inventory:
|
|
return True
|
|
return bool(sqlQuery('SELECT 1 FROM inventory WHERE hash=?', hash))
|
|
|
|
def __getitem__(self, hash):
|
|
with self.lock:
|
|
if hash in self._inventory:
|
|
return self._inventory[hash]
|
|
rows = sqlQuery('SELECT objecttype, streamnumber, payload, expirestime, tag FROM inventory WHERE hash=?', hash)
|
|
if not rows:
|
|
raise KeyError(hash)
|
|
return self.InventoryItem(*rows[0])
|
|
|
|
def __setitem__(self, hash, value):
|
|
with self.lock:
|
|
value = self.InventoryItem(*value)
|
|
self._inventory[hash] = value
|
|
self._streams[value.stream].add(hash)
|
|
PendingDownload().delete(hash)
|
|
|
|
def __delitem__(self, hash):
|
|
raise NotImplementedError
|
|
|
|
def __iter__(self):
|
|
with self.lock:
|
|
hashes = self._inventory.keys()[:]
|
|
hashes += (x for x, in sqlQuery('SELECT hash FROM inventory'))
|
|
return hashes.__iter__()
|
|
|
|
def __len__(self):
|
|
with self.lock:
|
|
return len(self._inventory) + sqlQuery('SELECT count(*) FROM inventory')[0][0]
|
|
|
|
def by_type_and_tag(self, type, tag):
|
|
with self.lock:
|
|
values = [value for value in self._inventory.values() if value.type == type and value.tag == tag]
|
|
values += (self.InventoryItem(*value) for value in sqlQuery('SELECT objecttype, streamnumber, payload, expirestime, tag FROM inventory WHERE objecttype=? AND tag=?', type, tag))
|
|
return values
|
|
|
|
def hashes_by_stream(self, stream):
|
|
with self.lock:
|
|
return self._streams[stream]
|
|
|
|
def unexpired_hashes_by_stream(self, stream):
|
|
with self.lock:
|
|
t = int(time.time())
|
|
hashes = [x for x, value in self._inventory.items() if value.stream == stream and value.expires > t]
|
|
hashes += (payload for payload, in sqlQuery('SELECT hash FROM inventory WHERE streamnumber=? AND expirestime>?', stream, t))
|
|
return hashes
|
|
|
|
def flush(self):
|
|
with self.lock: # If you use both the inventoryLock and the sqlLock, always use the inventoryLock OUTSIDE of the sqlLock.
|
|
with SqlBulkExecute() as sql:
|
|
for objectHash, value in self._inventory.items():
|
|
sql.execute('INSERT INTO inventory VALUES (?, ?, ?, ?, ?, ?)', objectHash, *value)
|
|
self._inventory.clear()
|
|
|
|
def clean(self):
|
|
with self.lock:
|
|
sqlExecute('DELETE FROM inventory WHERE expirestime<?',int(time.time()) - (60 * 60 * 3))
|
|
self._streams.clear()
|
|
for objectHash, value in self.items():
|
|
self._streams[value.stream].add(objectHash)
|
|
|
|
|
|
@Singleton
|
|
class PendingDownload(object):
|
|
# keep a track of objects that have been advertised to us but we haven't downloaded them yet
|
|
def __init__(self):
|
|
super(self.__class__, self).__init__()
|
|
self.lock = RLock()
|
|
self.hashes = {}
|
|
self.stopped = False
|
|
# don't request the same object more frequently than this
|
|
self.frequency = 60
|
|
# after requesting and not receiving an object more than this times, consider it expired
|
|
self.maxRequestCount = 3
|
|
self.pending = {}
|
|
|
|
def add(self, objectHash):
|
|
if self.stopped:
|
|
return
|
|
with self.lock:
|
|
if objectHash not in self.hashes:
|
|
self.hashes[objectHash] = {'peers':[], 'requested':0, 'requestedCount':0}
|
|
self.hashes[objectHash]['peers'].append(current_thread().peer)
|
|
|
|
def addPending(self, objectHash=None):
|
|
if self.stopped:
|
|
return
|
|
if current_thread().peer not in self.pending:
|
|
self.pending[current_thread().peer] = {'objects':[], 'requested':0, 'received':0}
|
|
if objectHash not in self.pending[current_thread().peer]['objects'] and not objectHash is None:
|
|
self.pending[current_thread().peer]['objects'].append(objectHash)
|
|
self.pending[current_thread().peer]['requested'] = time.time()
|
|
|
|
def len(self):
|
|
with self.lock:
|
|
return sum(1 for x in self.hashes.values() if len(x) > 0)
|
|
|
|
def pull(self, count=1):
|
|
if count < 1:
|
|
raise ValueError("Must be at least one")
|
|
objectHashes = []
|
|
unreachableObjects = []
|
|
if self.stopped:
|
|
return objectHashes
|
|
start = time.time()
|
|
try:
|
|
for objectHash in self.hashes.keys():
|
|
with self.lock:
|
|
if len(objectHashes) >= count:
|
|
break
|
|
if current_thread().peer not in self.pending:
|
|
self.addPending()
|
|
if (self.pending[current_thread().peer]['requested'] >= time.time() - self.frequency or \
|
|
self.pending[current_thread().peer]['received'] >= time.time() - self.frequency) and \
|
|
len(self.pending[current_thread().peer]['objects']) >= count:
|
|
break
|
|
if len(self.hashes[objectHash]['peers']) == 0:
|
|
unreachableObjects.append(objectHash)
|
|
continue
|
|
# requested too long ago or not at all from any thread
|
|
if self.hashes[objectHash]['requested'] < time.time() - self.frequency:
|
|
# ready requested from this thread but haven't received yet
|
|
if objectHash in self.pending[current_thread().peer]['objects']:
|
|
# if still sending or receiving, request next
|
|
if self.pending[current_thread().peer]['received'] >= time.time() - self.frequency or \
|
|
self.pending[current_thread().peer]['requested'] >= time.time() - self.frequency:
|
|
continue
|
|
# haven't requested or received anything recently, re-request (i.e. continue)
|
|
# the current node doesn't have the object
|
|
elif current_thread().peer not in self.hashes[objectHash]['peers']:
|
|
continue
|
|
# already requested too many times, remove all signs of this object
|
|
if self.hashes[objectHash]['requestedCount'] >= self.maxRequestCount:
|
|
del self.hashes[objectHash]
|
|
for thread in self.pending.keys():
|
|
if objectHash in self.pending[thread]['objects']:
|
|
self.pending[thread]['objects'].remove(objectHash)
|
|
continue
|
|
# all ok, request
|
|
objectHashes.append(objectHash)
|
|
self.hashes[objectHash]['requested'] = time.time()
|
|
self.hashes[objectHash]['requestedCount'] += 1
|
|
self.pending[current_thread().peer]['requested'] = time.time()
|
|
self.addPending(objectHash)
|
|
except (RuntimeError, KeyError, ValueError):
|
|
# the for cycle sometimes breaks if you remove elements
|
|
pass
|
|
for objectHash in unreachableObjects:
|
|
with self.lock:
|
|
if objectHash in self.hashes:
|
|
del self.hashes[objectHash]
|
|
# logger.debug("Pull took %.3f seconds", time.time() - start)
|
|
return objectHashes
|
|
|
|
def delete(self, objectHash):
|
|
with self.lock:
|
|
if objectHash in self.hashes:
|
|
del self.hashes[objectHash]
|
|
if hasattr(current_thread(), 'peer') and current_thread().peer in self.pending:
|
|
self.pending[current_thread().peer]['received'] = time.time()
|
|
for thread in self.pending.keys():
|
|
with self.lock:
|
|
if thread in self.pending and objectHash in self.pending[thread]['objects']:
|
|
self.pending[thread]['objects'].remove(objectHash)
|
|
|
|
def stop(self):
|
|
with self.lock:
|
|
self.hashes = {}
|
|
self.pending = {}
|
|
|
|
def threadEnd(self):
|
|
while True:
|
|
try:
|
|
with self.lock:
|
|
if current_thread().peer in self.pending:
|
|
for objectHash in self.pending[current_thread().peer]['objects']:
|
|
if objectHash in self.hashes:
|
|
self.hashes[objectHash]['peers'].remove(current_thread().peer)
|
|
except (KeyError):
|
|
pass
|
|
else:
|
|
break
|
|
with self.lock:
|
|
try:
|
|
del self.pending[current_thread().peer]
|
|
except KeyError:
|
|
pass
|
|
|
|
|
|
class PendingUploadDeadlineException(Exception):
|
|
pass
|
|
|
|
|
|
@Singleton
|
|
class PendingUpload(object):
|
|
# keep a track of objects that we have created but haven't distributed yet
|
|
def __init__(self):
|
|
super(self.__class__, self).__init__()
|
|
self.lock = RLock()
|
|
self.hashes = {}
|
|
# end by this time in any case
|
|
self.deadline = 0
|
|
self.maxLen = 0
|
|
# during shutdown, wait up to 20 seconds to finish uploading
|
|
self.shutdownWait = 20
|
|
# forget tracking objects after 60 seconds
|
|
self.objectWait = 60
|
|
# wait 10 seconds between clears
|
|
self.clearDelay = 10
|
|
self.lastCleared = time.time()
|
|
|
|
def add(self, objectHash = None):
|
|
with self.lock:
|
|
# add a new object into existing thread lists
|
|
if objectHash:
|
|
if objectHash not in self.hashes:
|
|
self.hashes[objectHash] = {'created': time.time(), 'sendCount': 0, 'peers': []}
|
|
for thread in threadingEnumerate():
|
|
if thread.isAlive() and hasattr(thread, 'peer') and \
|
|
thread.peer not in self.hashes[objectHash]['peers']:
|
|
self.hashes[objectHash]['peers'].append(thread.peer)
|
|
# add all objects into the current thread
|
|
else:
|
|
for objectHash in self.hashes:
|
|
if current_thread().peer not in self.hashes[objectHash]['peers']:
|
|
self.hashes[objectHash]['peers'].append(current_thread().peer)
|
|
|
|
def len(self):
|
|
self.clearHashes()
|
|
with self.lock:
|
|
return sum(1
|
|
for x in self.hashes if (self.hashes[x]['created'] + self.objectWait < time.time() or
|
|
self.hashes[x]['sendCount'] == 0))
|
|
|
|
def _progress(self):
|
|
with self.lock:
|
|
return float(sum(len(self.hashes[x]['peers'])
|
|
for x in self.hashes if (self.hashes[x]['created'] + self.objectWait < time.time()) or
|
|
self.hashes[x]['sendCount'] == 0))
|
|
|
|
def progress(self, raiseDeadline=True):
|
|
if self.maxLen < self._progress():
|
|
self.maxLen = self._progress()
|
|
if self.deadline < time.time():
|
|
if self.deadline > 0 and raiseDeadline:
|
|
raise PendingUploadDeadlineException
|
|
self.deadline = time.time() + 20
|
|
try:
|
|
return 1.0 - self._progress() / self.maxLen
|
|
except ZeroDivisionError:
|
|
return 1.0
|
|
|
|
def clearHashes(self, objectHash=None):
|
|
if objectHash is None:
|
|
if self.lastCleared > time.time() - self.clearDelay:
|
|
return
|
|
objects = self.hashes.keys()
|
|
else:
|
|
objects = objectHash,
|
|
with self.lock:
|
|
for i in objects:
|
|
try:
|
|
if self.hashes[i]['sendCount'] > 0 and (
|
|
len(self.hashes[i]['peers']) == 0 or
|
|
self.hashes[i]['created'] + self.objectWait < time.time()):
|
|
del self.hashes[i]
|
|
except KeyError:
|
|
pass
|
|
self.lastCleared = time.time()
|
|
|
|
def delete(self, objectHash=None):
|
|
if not hasattr(current_thread(), 'peer'):
|
|
return
|
|
if objectHash is None:
|
|
return
|
|
with self.lock:
|
|
try:
|
|
if objectHash in self.hashes and current_thread().peer in self.hashes[objectHash]['peers']:
|
|
self.hashes[objectHash]['sendCount'] += 1
|
|
self.hashes[objectHash]['peers'].remove(current_thread().peer)
|
|
except KeyError:
|
|
pass
|
|
self.clearHashes(objectHash)
|
|
|
|
def stop(self):
|
|
with self.lock:
|
|
self.hashes = {}
|
|
|
|
def threadEnd(self):
|
|
with self.lock:
|
|
for objectHash in self.hashes:
|
|
try:
|
|
if current_thread().peer in self.hashes[objectHash]['peers']:
|
|
self.hashes[objectHash]['peers'].remove(current_thread().peer)
|
|
except KeyError:
|
|
pass
|
|
self.clearHashes()
|