273 lines
7.5 KiB
Python
273 lines
7.5 KiB
Python
import base64
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import codecs
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import datetime
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import random
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import socket
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import string
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import json
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import typing
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import asyncio
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import ssl
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import logging
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import ipaddress
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import pkg_resources
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import contextlib
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import certifi
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import aiohttp
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import functools
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import collections
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from lbry.schema.claim import Claim
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from lbry.cryptoutils import get_lbry_hash_obj
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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():
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return datetime.datetime.now()
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def utcnow():
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return datetime.datetime.utcnow()
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def isonow():
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"""Return utc now in isoformat with timezone"""
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return utcnow().isoformat() + 'Z'
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def today():
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return datetime.datetime.today()
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def timedelta(**kwargs):
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return datetime.timedelta(**kwargs)
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def datetime_obj(*args, **kwargs):
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return datetime.datetime(*args, **kwargs)
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def generate_id(num=None):
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h = get_lbry_hash_obj()
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if num is not None:
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h.update(str(num).encode())
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else:
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h.update(str(random.getrandbits(512)).encode())
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return h.digest()
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def version_is_greater_than(a, b):
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"""Returns True if version a is more recent than version b"""
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return pkg_resources.parse_version(a) > pkg_resources.parse_version(b)
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def rot13(some_str):
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return codecs.encode(some_str, 'rot_13')
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def deobfuscate(obfustacated):
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return base64.b64decode(rot13(obfustacated)).decode()
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def obfuscate(plain):
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return rot13(base64.b64encode(plain).decode())
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def check_connection(server="lbry.com", port=80, timeout=5) -> bool:
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"""Attempts to open a socket to server:port and returns True if successful."""
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log.debug('Checking connection to %s:%s', server, port)
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try:
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server = socket.gethostbyname(server)
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socket.create_connection((server, port), timeout).close()
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return True
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except (socket.gaierror, socket.herror) as ex:
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log.debug("Failed to connect to %s:%s. Unable to resolve domain. Trying to bypass DNS",
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server, port)
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try:
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server = "8.8.8.8"
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port = 53
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socket.create_connection((server, port), timeout).close()
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return True
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except OSError:
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return False
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except OSError:
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return False
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async def async_check_connection(server="lbry.com", port=80, timeout=1) -> bool:
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return await asyncio.get_event_loop().run_in_executor(None, check_connection, server, port, timeout)
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def random_string(length=10, chars=string.ascii_lowercase):
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return ''.join([random.choice(chars) for _ in range(length)])
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def short_hash(hash_str):
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return hash_str[:6]
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def get_sd_hash(stream_info):
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if not stream_info:
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return None
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if isinstance(stream_info, Claim):
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return stream_info.stream.source.sd_hash
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result = stream_info.get('claim', {}).\
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get('value', {}).\
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get('stream', {}).\
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get('source', {}).\
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get('source')
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if not result:
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log.warning("Unable to get sd_hash")
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return result
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def json_dumps_pretty(obj, **kwargs):
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return json.dumps(obj, sort_keys=True, indent=2, separators=(',', ': '), **kwargs)
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def cancel_task(task: typing.Optional[asyncio.Task]):
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if task and not task.done():
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task.cancel()
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def cancel_tasks(tasks: typing.List[typing.Optional[asyncio.Task]]):
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for task in tasks:
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cancel_task(task)
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def drain_tasks(tasks: typing.List[typing.Optional[asyncio.Task]]):
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while tasks:
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cancel_task(tasks.pop())
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def async_timed_cache(duration: int):
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def wrapper(fn):
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cache: typing.Dict[typing.Tuple,
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typing.Tuple[typing.Any, float]] = {}
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@functools.wraps(fn)
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async def _inner(*args, **kwargs) -> typing.Any:
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loop = asyncio.get_running_loop()
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now = loop.time()
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key = tuple([args, tuple([tuple([k, kwargs[k]]) for k in kwargs])])
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if key in cache and (now - cache[key][1] < duration):
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return cache[key][0]
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to_cache = await fn(*args, **kwargs)
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cache[key] = to_cache, now
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return to_cache
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return _inner
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return wrapper
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def cache_concurrent(async_fn):
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"""
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When the decorated function has concurrent calls made to it with the same arguments, only run it once
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"""
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cache: typing.Dict = {}
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@functools.wraps(async_fn)
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async def wrapper(*args, **kwargs):
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key = tuple([args, tuple([tuple([k, kwargs[k]]) for k in kwargs])])
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cache[key] = cache.get(key) or asyncio.create_task(async_fn(*args, **kwargs))
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try:
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return await cache[key]
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finally:
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cache.pop(key, None)
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return wrapper
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@async_timed_cache(300)
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async def resolve_host(url: str, port: int, proto: str) -> str:
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if proto not in ['udp', 'tcp']:
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raise Exception("invalid protocol")
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try:
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if ipaddress.ip_address(url):
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return url
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except ValueError:
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pass
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loop = asyncio.get_running_loop()
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return (await loop.getaddrinfo(
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url, port,
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proto=socket.IPPROTO_TCP if proto == 'tcp' else socket.IPPROTO_UDP,
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type=socket.SOCK_STREAM if proto == 'tcp' else socket.SOCK_DGRAM,
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family=socket.AF_INET
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))[0][4][0]
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class LRUCache:
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__slots__ = [
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'capacity',
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'cache'
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]
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def __init__(self, capacity):
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self.capacity = capacity
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self.cache = collections.OrderedDict()
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def get(self, key):
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value = self.cache.pop(key)
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self.cache[key] = value
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return value
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def set(self, key, value):
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try:
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self.cache.pop(key)
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except KeyError:
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if len(self.cache) >= self.capacity:
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self.cache.popitem(last=False)
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self.cache[key] = value
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def __contains__(self, item) -> bool:
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return item in self.cache
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def lru_cache_concurrent(cache_size: typing.Optional[int] = None,
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override_lru_cache: typing.Optional[LRUCache] = None):
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if not cache_size and override_lru_cache is None:
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raise ValueError("invalid cache size")
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concurrent_cache = {}
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lru_cache = override_lru_cache or LRUCache(cache_size)
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def wrapper(async_fn):
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@functools.wraps(async_fn)
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async def _inner(*args, **kwargs):
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key = tuple([args, tuple([tuple([k, kwargs[k]]) for k in kwargs])])
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if key in lru_cache:
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return lru_cache.get(key)
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concurrent_cache[key] = concurrent_cache.get(key) or asyncio.create_task(async_fn(*args, **kwargs))
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try:
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result = await concurrent_cache[key]
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lru_cache.set(key, result)
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return result
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finally:
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concurrent_cache.pop(key, None)
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return _inner
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return wrapper
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def get_ssl_context() -> ssl.SSLContext:
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return ssl.create_default_context(
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purpose=ssl.Purpose.CLIENT_AUTH, capath=certifi.where()
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)
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@contextlib.asynccontextmanager
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async def aiohttp_request(method, url, **kwargs) -> typing.AsyncContextManager[aiohttp.ClientResponse]:
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async with aiohttp.ClientSession() as session:
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async with session.request(method, url, ssl=get_ssl_context(), **kwargs) as response:
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yield response
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async def get_external_ip() -> typing.Optional[str]: # used if upnp is disabled or non-functioning
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try:
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async with aiohttp_request("get", "https://api.lbry.com/ip") as resp:
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response = await resp.json()
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if response['success']:
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return response['data']['ip']
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except Exception as e:
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return
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