lbry-sdk/lbrynet/core/utils.py

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import base64
import datetime
import distutils.version
import logging
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import random
import os
import socket
import sys
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from lbrynet.core.cryptoutils import get_lbry_hash_obj
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# digest_size is in bytes, and blob hashes are hex encoded
blobhash_length = get_lbry_hash_obj().digest_size * 2
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log = logging.getLogger(__name__)
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# defining these time functions here allows for easier overriding in testing
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def now():
return datetime.datetime.now()
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def utcnow():
return datetime.datetime.utcnow()
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def isonow():
"""Return utc now in isoformat with timezone"""
return utcnow().isoformat() + 'Z'
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def today():
return datetime.datetime.today()
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def generate_id(num=None):
h = get_lbry_hash_obj()
if num is not None:
h.update(str(num))
else:
h.update(str(random.getrandbits(512)))
return h.digest()
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def is_valid_hashcharacter(char):
return char in "0123456789abcdef"
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def is_valid_blobhash(blobhash):
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"""Checks whether the blobhash is the correct length and contains only
valid characters (0-9, a-f)
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@param blobhash: string, the blobhash to check
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@return: True/False
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"""
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return len(blobhash) == blobhash_length and all(is_valid_hashcharacter(l) for l in blobhash)
def version_is_greater_than(a, b):
"""Returns True if version a is more recent than version b"""
try:
return distutils.version.StrictVersion(a) > distutils.version.StrictVersion(b)
except ValueError:
return distutils.version.LooseVersion(a) > distutils.version.LooseVersion(b)
def deobfuscate(obfustacated):
return base64.b64decode(obfustacated.decode('rot13'))
def obfuscate(plain):
return base64.b64encode(plain).encode('rot13')
def check_connection(server="www.lbry.io", port=80):
"""Attempts to open a socket to server:port and returns True if successful."""
try:
host = socket.gethostbyname(server)
s = socket.create_connection((host, port), 2)
return True
except Exception as ex:
log.info(
"Failed to connect to %s:%s. Maybe the internet connection is not working",
server, port, exc_info=True)
return False
def setup_certs_for_windows():
if getattr(sys, 'frozen', False) and os.name == "nt":
cert_path = os.path.join(os.path.dirname(sys.executable), "cacert.pem")
os.environ["REQUESTS_CA_BUNDLE"] = cert_path