from __future__ import print_function
from __future__ import with_statement
import base64
import calendar
import os
import shutil
import socket
import tempfile
import time
try:
import cPickle as pickle
except ImportError:
import pickle
[docs]def sanitize_packet(packet):
"""Function to sanitize a packet for pathfinding_message serialization, or dict keying"""
if isinstance(packet, type(u'')):
return packet.encode('utf-8')
elif not isinstance(packet, (bytes, bytearray)):
return packet.encode('raw_unicode_escape')
return packet
[docs]def intersect(*args): # returns list
"""Finds the intersection of several iterables
Args:
*args: Several iterables
Returns:
A list containing the ordered intersection of all given iterables,
where the order is defined by the first iterable
"""
if not all(args):
return []
intersection = args[0]
for l in args[1:]:
intersection = [item for item in intersection if item in l]
return intersection
[docs]def get_lan_ip():
"""Retrieves the LAN ip. Expanded from http://stackoverflow.com/a/28950776
Note: This will return '127.0.0.1' if it is not connected to a network
"""
import socket
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
try:
# doesn't even have to be reachable
s.connect(('8.8.8.8', 23))
IP = s.getsockname()[0]
except:
IP = '127.0.0.1'
finally:
s.shutdown(socket.SHUT_RDWR)
return IP
[docs]def getUTC():
"""Returns the current unix time in UTC
Note: This will always return an integral value
"""
return calendar.timegm(time.gmtime())
[docs]def get_socket(protocol, serverside=False):
"""Given a protocol object, return the appropriate socket
Args:
protocol: A py2p.base.protocol object
serverside: Whether you are the server end of a connection (default: False)
Raises:
ValueError: If your protocol object has an unknown encryption method
Returns:
A socket-like object
"""
if protocol.encryption == "Plaintext":
return socket.socket()
elif protocol.encryption == "SSL":
from . import ssl_wrapper # This is inline to prevent dependency issues
return ssl_wrapper.get_socket(serverside)
else: # pragma: no cover
raise ValueError("Unkown encryption method")
[docs]class awaiting_value(object):
"""Proxy object for an asynchronously retrieved item"""
[docs] def __init__(self, value=-1):
self.value = value
self.callback = False
[docs] def callback_method(self, method, key):
from .base import flags
self.callback.send(flags.whisper, flags.response, method, key, self.value)
def __repr__(self):
return "<" + repr(self.value) + ">"
[docs]def most_common(tmp):
"""Returns the most common element in a list
Args:
tmp: A non-string iterable
Returns:
The most common element in the iterable
Warning:
If there are multiple elements which share the same count, it will return a random one.
"""
lst = []
for item in tmp:
if isinstance(item, awaiting_value):
lst.append(item.value)
else:
lst.append(item)
ret = max(set(lst), key=lst.count)
if lst.count(ret) == lst.count(-1):
return -1, lst.count(ret)
return ret, lst.count(ret)