5520d518b5
cryptstream py3 support, mostly commenting out implements() lbry_file py3 support, mostly commenting out implements() file_manager py3 support, mostly commenting out implements() core py3 support, mostly commenting out implements() and fixing imports
146 lines
5.1 KiB
Python
146 lines
5.1 KiB
Python
import logging
|
|
from . import constants
|
|
from .distance import Distance
|
|
from .error import BucketFull
|
|
|
|
log = logging.getLogger(__name__)
|
|
|
|
|
|
class KBucket(object):
|
|
""" Description - later
|
|
"""
|
|
|
|
def __init__(self, rangeMin, rangeMax, node_id):
|
|
"""
|
|
@param rangeMin: The lower boundary for the range in the n-bit ID
|
|
space covered by this k-bucket
|
|
@param rangeMax: The upper boundary for the range in the ID space
|
|
covered by this k-bucket
|
|
"""
|
|
self.lastAccessed = 0
|
|
self.rangeMin = rangeMin
|
|
self.rangeMax = rangeMax
|
|
self._contacts = list()
|
|
self._node_id = node_id
|
|
|
|
def addContact(self, contact):
|
|
""" Add contact to _contact list in the right order. This will move the
|
|
contact to the end of the k-bucket if it is already present.
|
|
|
|
@raise kademlia.kbucket.BucketFull: Raised when the bucket is full and
|
|
the contact isn't in the bucket
|
|
already
|
|
|
|
@param contact: The contact to add
|
|
@type contact: dht.contact._Contact
|
|
"""
|
|
if contact in self._contacts:
|
|
# Move the existing contact to the end of the list
|
|
# - using the new contact to allow add-on data
|
|
# (e.g. optimization-specific stuff) to pe updated as well
|
|
self._contacts.remove(contact)
|
|
self._contacts.append(contact)
|
|
elif len(self._contacts) < constants.k:
|
|
self._contacts.append(contact)
|
|
else:
|
|
raise BucketFull("No space in bucket to insert contact")
|
|
|
|
def getContact(self, contactID):
|
|
"""Get the contact specified node ID
|
|
|
|
@raise IndexError: raised if the contact is not in the bucket
|
|
|
|
@param contactID: the node id of the contact to retrieve
|
|
@type contactID: str
|
|
|
|
@rtype: dht.contact._Contact
|
|
"""
|
|
for contact in self._contacts:
|
|
if contact.id == contactID:
|
|
return contact
|
|
raise IndexError(contactID)
|
|
|
|
def getContacts(self, count=-1, excludeContact=None, sort_distance_to=None):
|
|
""" Returns a list containing up to the first count number of contacts
|
|
|
|
@param count: The amount of contacts to return (if 0 or less, return
|
|
all contacts)
|
|
@type count: int
|
|
@param excludeContact: A node id to exclude; if this contact is in
|
|
the list of returned values, it will be
|
|
discarded before returning. If a C{str} is
|
|
passed as this argument, it must be the
|
|
contact's ID.
|
|
@type excludeContact: str
|
|
|
|
@param sort_distance_to: Sort distance to the id, defaulting to the parent node id. If False don't
|
|
sort the contacts
|
|
|
|
@raise IndexError: If the number of requested contacts is too large
|
|
|
|
@return: Return up to the first count number of contacts in a list
|
|
If no contacts are present an empty is returned
|
|
@rtype: list
|
|
"""
|
|
contacts = [contact for contact in self._contacts if contact.id != excludeContact]
|
|
|
|
# Return all contacts in bucket
|
|
if count <= 0:
|
|
count = len(contacts)
|
|
|
|
# Get current contact number
|
|
currentLen = len(contacts)
|
|
|
|
# If count greater than k - return only k contacts
|
|
if count > constants.k:
|
|
count = constants.k
|
|
|
|
if not currentLen:
|
|
return contacts
|
|
|
|
if sort_distance_to is False:
|
|
pass
|
|
else:
|
|
sort_distance_to = sort_distance_to or self._node_id
|
|
contacts.sort(key=lambda c: Distance(sort_distance_to)(c.id))
|
|
|
|
return contacts[:min(currentLen, count)]
|
|
|
|
def getBadOrUnknownContacts(self):
|
|
contacts = self.getContacts(sort_distance_to=False)
|
|
results = [contact for contact in contacts if contact.contact_is_good is False]
|
|
results.extend(contact for contact in contacts if contact.contact_is_good is None)
|
|
return results
|
|
|
|
def removeContact(self, contact):
|
|
""" Remove the contact from the bucket
|
|
|
|
@param contact: The contact to remove
|
|
@type contact: dht.contact._Contact
|
|
|
|
@raise ValueError: The specified contact is not in this bucket
|
|
"""
|
|
self._contacts.remove(contact)
|
|
|
|
def keyInRange(self, key):
|
|
""" Tests whether the specified key (i.e. node ID) is in the range
|
|
of the n-bit ID space covered by this k-bucket (in otherwords, it
|
|
returns whether or not the specified key should be placed in this
|
|
k-bucket)
|
|
|
|
@param key: The key to test
|
|
@type key: str or int
|
|
|
|
@return: C{True} if the key is in this k-bucket's range, or C{False}
|
|
if not.
|
|
@rtype: bool
|
|
"""
|
|
if isinstance(key, str):
|
|
key = long(key.encode('hex'), 16)
|
|
return self.rangeMin <= key < self.rangeMax
|
|
|
|
def __len__(self):
|
|
return len(self._contacts)
|
|
|
|
def __contains__(self, item):
|
|
return item in self._contacts
|