mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-09-20 06:17:29 +02:00
780 lines
22 KiB
Python
780 lines
22 KiB
Python
"""Various helper functions"""
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import asyncio
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import base64
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import binascii
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import cgi
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import datetime
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import functools
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import inspect
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import netrc
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import os
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import platform
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import re
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import sys
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import time
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import warnings
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import weakref
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from collections import namedtuple
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from contextlib import suppress
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from math import ceil
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from pathlib import Path
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from types import TracebackType
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from typing import (
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Any,
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Callable,
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Dict,
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Generator,
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Generic,
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Iterable,
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Iterator,
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List,
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Mapping,
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Optional,
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Pattern,
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Set,
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Tuple,
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Type,
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TypeVar,
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Union,
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cast,
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)
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from urllib.parse import quote
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from urllib.request import getproxies
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import async_timeout
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import attr
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from multidict import MultiDict, MultiDictProxy
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from typing_extensions import Protocol
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from yarl import URL
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from . import hdrs
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from .log import client_logger, internal_logger
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from .typedefs import PathLike # noqa
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__all__ = ("BasicAuth", "ChainMapProxy")
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PY_36 = sys.version_info >= (3, 6)
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PY_37 = sys.version_info >= (3, 7)
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PY_38 = sys.version_info >= (3, 8)
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if not PY_37:
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import idna_ssl
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idna_ssl.patch_match_hostname()
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try:
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from typing import ContextManager
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except ImportError:
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from typing_extensions import ContextManager
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def all_tasks(
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loop: Optional[asyncio.AbstractEventLoop] = None,
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) -> Set["asyncio.Task[Any]"]:
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tasks = list(asyncio.Task.all_tasks(loop))
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return {t for t in tasks if not t.done()}
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if PY_37:
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all_tasks = getattr(asyncio, "all_tasks")
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_T = TypeVar("_T")
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_S = TypeVar("_S")
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sentinel = object() # type: Any
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NO_EXTENSIONS = bool(os.environ.get("AIOHTTP_NO_EXTENSIONS")) # type: bool
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# N.B. sys.flags.dev_mode is available on Python 3.7+, use getattr
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# for compatibility with older versions
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DEBUG = getattr(sys.flags, "dev_mode", False) or (
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not sys.flags.ignore_environment and bool(os.environ.get("PYTHONASYNCIODEBUG"))
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) # type: bool
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CHAR = {chr(i) for i in range(0, 128)}
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CTL = {chr(i) for i in range(0, 32)} | {
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chr(127),
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}
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SEPARATORS = {
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"(",
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")",
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"<",
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">",
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"@",
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",",
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";",
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":",
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"\\",
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'"',
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"/",
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"[",
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"]",
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"?",
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"=",
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"{",
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"}",
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" ",
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chr(9),
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}
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TOKEN = CHAR ^ CTL ^ SEPARATORS
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class noop:
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def __await__(self) -> Generator[None, None, None]:
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yield
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class BasicAuth(namedtuple("BasicAuth", ["login", "password", "encoding"])):
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"""Http basic authentication helper."""
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def __new__(
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cls, login: str, password: str = "", encoding: str = "latin1"
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) -> "BasicAuth":
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if login is None:
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raise ValueError("None is not allowed as login value")
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if password is None:
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raise ValueError("None is not allowed as password value")
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if ":" in login:
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raise ValueError('A ":" is not allowed in login (RFC 1945#section-11.1)')
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return super().__new__(cls, login, password, encoding)
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@classmethod
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def decode(cls, auth_header: str, encoding: str = "latin1") -> "BasicAuth":
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"""Create a BasicAuth object from an Authorization HTTP header."""
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try:
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auth_type, encoded_credentials = auth_header.split(" ", 1)
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except ValueError:
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raise ValueError("Could not parse authorization header.")
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if auth_type.lower() != "basic":
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raise ValueError("Unknown authorization method %s" % auth_type)
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try:
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decoded = base64.b64decode(
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encoded_credentials.encode("ascii"), validate=True
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).decode(encoding)
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except binascii.Error:
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raise ValueError("Invalid base64 encoding.")
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try:
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# RFC 2617 HTTP Authentication
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# https://www.ietf.org/rfc/rfc2617.txt
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# the colon must be present, but the username and password may be
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# otherwise blank.
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username, password = decoded.split(":", 1)
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except ValueError:
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raise ValueError("Invalid credentials.")
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return cls(username, password, encoding=encoding)
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@classmethod
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def from_url(cls, url: URL, *, encoding: str = "latin1") -> Optional["BasicAuth"]:
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"""Create BasicAuth from url."""
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if not isinstance(url, URL):
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raise TypeError("url should be yarl.URL instance")
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if url.user is None:
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return None
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return cls(url.user, url.password or "", encoding=encoding)
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def encode(self) -> str:
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"""Encode credentials."""
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creds = (f"{self.login}:{self.password}").encode(self.encoding)
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return "Basic %s" % base64.b64encode(creds).decode(self.encoding)
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def strip_auth_from_url(url: URL) -> Tuple[URL, Optional[BasicAuth]]:
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auth = BasicAuth.from_url(url)
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if auth is None:
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return url, None
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else:
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return url.with_user(None), auth
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def netrc_from_env() -> Optional[netrc.netrc]:
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"""Attempt to load the netrc file from the path specified by the env-var
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NETRC or in the default location in the user's home directory.
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Returns None if it couldn't be found or fails to parse.
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"""
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netrc_env = os.environ.get("NETRC")
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if netrc_env is not None:
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netrc_path = Path(netrc_env)
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else:
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try:
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home_dir = Path.home()
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except RuntimeError as e: # pragma: no cover
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# if pathlib can't resolve home, it may raise a RuntimeError
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client_logger.debug(
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"Could not resolve home directory when "
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"trying to look for .netrc file: %s",
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e,
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)
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return None
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netrc_path = home_dir / (
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"_netrc" if platform.system() == "Windows" else ".netrc"
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)
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try:
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return netrc.netrc(str(netrc_path))
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except netrc.NetrcParseError as e:
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client_logger.warning("Could not parse .netrc file: %s", e)
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except OSError as e:
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# we couldn't read the file (doesn't exist, permissions, etc.)
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if netrc_env or netrc_path.is_file():
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# only warn if the environment wanted us to load it,
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# or it appears like the default file does actually exist
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client_logger.warning("Could not read .netrc file: %s", e)
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return None
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@attr.s(auto_attribs=True, frozen=True, slots=True)
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class ProxyInfo:
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proxy: URL
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proxy_auth: Optional[BasicAuth]
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def proxies_from_env() -> Dict[str, ProxyInfo]:
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proxy_urls = {k: URL(v) for k, v in getproxies().items() if k in ("http", "https")}
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netrc_obj = netrc_from_env()
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stripped = {k: strip_auth_from_url(v) for k, v in proxy_urls.items()}
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ret = {}
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for proto, val in stripped.items():
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proxy, auth = val
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if proxy.scheme == "https":
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client_logger.warning("HTTPS proxies %s are not supported, ignoring", proxy)
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continue
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if netrc_obj and auth is None:
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auth_from_netrc = None
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if proxy.host is not None:
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auth_from_netrc = netrc_obj.authenticators(proxy.host)
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if auth_from_netrc is not None:
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# auth_from_netrc is a (`user`, `account`, `password`) tuple,
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# `user` and `account` both can be username,
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# if `user` is None, use `account`
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*logins, password = auth_from_netrc
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login = logins[0] if logins[0] else logins[-1]
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auth = BasicAuth(cast(str, login), cast(str, password))
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ret[proto] = ProxyInfo(proxy, auth)
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return ret
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def current_task(
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loop: Optional[asyncio.AbstractEventLoop] = None,
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) -> "Optional[asyncio.Task[Any]]":
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if PY_37:
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return asyncio.current_task(loop=loop)
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else:
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return asyncio.Task.current_task(loop=loop)
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def get_running_loop(
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loop: Optional[asyncio.AbstractEventLoop] = None,
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) -> asyncio.AbstractEventLoop:
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if loop is None:
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loop = asyncio.get_event_loop()
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if not loop.is_running():
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warnings.warn(
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"The object should be created within an async function",
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DeprecationWarning,
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stacklevel=3,
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)
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if loop.get_debug():
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internal_logger.warning(
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"The object should be created within an async function", stack_info=True
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)
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return loop
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def isasyncgenfunction(obj: Any) -> bool:
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func = getattr(inspect, "isasyncgenfunction", None)
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if func is not None:
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return func(obj)
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else:
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return False
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@attr.s(auto_attribs=True, frozen=True, slots=True)
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class MimeType:
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type: str
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subtype: str
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suffix: str
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parameters: "MultiDictProxy[str]"
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@functools.lru_cache(maxsize=56)
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def parse_mimetype(mimetype: str) -> MimeType:
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"""Parses a MIME type into its components.
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mimetype is a MIME type string.
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Returns a MimeType object.
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Example:
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>>> parse_mimetype('text/html; charset=utf-8')
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MimeType(type='text', subtype='html', suffix='',
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parameters={'charset': 'utf-8'})
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"""
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if not mimetype:
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return MimeType(
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type="", subtype="", suffix="", parameters=MultiDictProxy(MultiDict())
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)
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parts = mimetype.split(";")
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params = MultiDict() # type: MultiDict[str]
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for item in parts[1:]:
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if not item:
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continue
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key, value = cast(
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Tuple[str, str], item.split("=", 1) if "=" in item else (item, "")
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)
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params.add(key.lower().strip(), value.strip(' "'))
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fulltype = parts[0].strip().lower()
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if fulltype == "*":
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fulltype = "*/*"
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mtype, stype = (
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cast(Tuple[str, str], fulltype.split("/", 1))
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if "/" in fulltype
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else (fulltype, "")
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)
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stype, suffix = (
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cast(Tuple[str, str], stype.split("+", 1)) if "+" in stype else (stype, "")
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)
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return MimeType(
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type=mtype, subtype=stype, suffix=suffix, parameters=MultiDictProxy(params)
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)
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def guess_filename(obj: Any, default: Optional[str] = None) -> Optional[str]:
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name = getattr(obj, "name", None)
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if name and isinstance(name, str) and name[0] != "<" and name[-1] != ">":
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return Path(name).name
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return default
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def content_disposition_header(
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disptype: str, quote_fields: bool = True, **params: str
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) -> str:
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"""Sets ``Content-Disposition`` header.
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disptype is a disposition type: inline, attachment, form-data.
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Should be valid extension token (see RFC 2183)
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params is a dict with disposition params.
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"""
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if not disptype or not (TOKEN > set(disptype)):
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raise ValueError("bad content disposition type {!r}" "".format(disptype))
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value = disptype
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if params:
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lparams = []
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for key, val in params.items():
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if not key or not (TOKEN > set(key)):
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raise ValueError(
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"bad content disposition parameter" " {!r}={!r}".format(key, val)
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)
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qval = quote(val, "") if quote_fields else val
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lparams.append((key, '"%s"' % qval))
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if key == "filename":
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lparams.append(("filename*", "utf-8''" + qval))
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sparams = "; ".join("=".join(pair) for pair in lparams)
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value = "; ".join((value, sparams))
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return value
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class _TSelf(Protocol):
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_cache: Dict[str, Any]
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class reify(Generic[_T]):
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"""Use as a class method decorator. It operates almost exactly like
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the Python `@property` decorator, but it puts the result of the
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method it decorates into the instance dict after the first call,
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effectively replacing the function it decorates with an instance
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variable. It is, in Python parlance, a data descriptor.
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"""
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def __init__(self, wrapped: Callable[..., _T]) -> None:
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self.wrapped = wrapped
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self.__doc__ = wrapped.__doc__
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self.name = wrapped.__name__
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def __get__(self, inst: _TSelf, owner: Optional[Type[Any]] = None) -> _T:
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try:
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try:
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return inst._cache[self.name]
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except KeyError:
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val = self.wrapped(inst)
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inst._cache[self.name] = val
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return val
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except AttributeError:
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if inst is None:
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return self
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raise
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def __set__(self, inst: _TSelf, value: _T) -> None:
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raise AttributeError("reified property is read-only")
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reify_py = reify
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try:
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from ._helpers import reify as reify_c
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if not NO_EXTENSIONS:
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reify = reify_c # type: ignore
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except ImportError:
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pass
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_ipv4_pattern = (
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r"^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}"
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r"(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$"
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)
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_ipv6_pattern = (
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r"^(?:(?:(?:[A-F0-9]{1,4}:){6}|(?=(?:[A-F0-9]{0,4}:){0,6}"
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r"(?:[0-9]{1,3}\.){3}[0-9]{1,3}$)(([0-9A-F]{1,4}:){0,5}|:)"
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r"((:[0-9A-F]{1,4}){1,5}:|:)|::(?:[A-F0-9]{1,4}:){5})"
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r"(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.){3}"
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r"(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])|(?:[A-F0-9]{1,4}:){7}"
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r"[A-F0-9]{1,4}|(?=(?:[A-F0-9]{0,4}:){0,7}[A-F0-9]{0,4}$)"
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r"(([0-9A-F]{1,4}:){1,7}|:)((:[0-9A-F]{1,4}){1,7}|:)|(?:[A-F0-9]{1,4}:){7}"
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r":|:(:[A-F0-9]{1,4}){7})$"
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)
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_ipv4_regex = re.compile(_ipv4_pattern)
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_ipv6_regex = re.compile(_ipv6_pattern, flags=re.IGNORECASE)
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_ipv4_regexb = re.compile(_ipv4_pattern.encode("ascii"))
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_ipv6_regexb = re.compile(_ipv6_pattern.encode("ascii"), flags=re.IGNORECASE)
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def _is_ip_address(
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regex: Pattern[str], regexb: Pattern[bytes], host: Optional[Union[str, bytes]]
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) -> bool:
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if host is None:
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return False
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if isinstance(host, str):
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return bool(regex.match(host))
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elif isinstance(host, (bytes, bytearray, memoryview)):
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return bool(regexb.match(host))
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else:
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raise TypeError("{} [{}] is not a str or bytes".format(host, type(host)))
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is_ipv4_address = functools.partial(_is_ip_address, _ipv4_regex, _ipv4_regexb)
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is_ipv6_address = functools.partial(_is_ip_address, _ipv6_regex, _ipv6_regexb)
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def is_ip_address(host: Optional[Union[str, bytes, bytearray, memoryview]]) -> bool:
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return is_ipv4_address(host) or is_ipv6_address(host)
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def next_whole_second() -> datetime.datetime:
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"""Return current time rounded up to the next whole second."""
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return datetime.datetime.now(datetime.timezone.utc).replace(
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microsecond=0
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) + datetime.timedelta(seconds=0)
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_cached_current_datetime = None # type: Optional[int]
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_cached_formatted_datetime = ""
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def rfc822_formatted_time() -> str:
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global _cached_current_datetime
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global _cached_formatted_datetime
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now = int(time.time())
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if now != _cached_current_datetime:
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# Weekday and month names for HTTP date/time formatting;
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# always English!
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# Tuples are constants stored in codeobject!
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_weekdayname = ("Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun")
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_monthname = (
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"", # Dummy so we can use 1-based month numbers
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"Jan",
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"Feb",
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"Mar",
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"Apr",
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"May",
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"Jun",
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"Jul",
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"Aug",
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"Sep",
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"Oct",
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"Nov",
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"Dec",
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)
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year, month, day, hh, mm, ss, wd, *tail = time.gmtime(now)
|
|
_cached_formatted_datetime = "%s, %02d %3s %4d %02d:%02d:%02d GMT" % (
|
|
_weekdayname[wd],
|
|
day,
|
|
_monthname[month],
|
|
year,
|
|
hh,
|
|
mm,
|
|
ss,
|
|
)
|
|
_cached_current_datetime = now
|
|
return _cached_formatted_datetime
|
|
|
|
|
|
def _weakref_handle(info): # type: ignore
|
|
ref, name = info
|
|
ob = ref()
|
|
if ob is not None:
|
|
with suppress(Exception):
|
|
getattr(ob, name)()
|
|
|
|
|
|
def weakref_handle(ob, name, timeout, loop): # type: ignore
|
|
if timeout is not None and timeout > 0:
|
|
when = loop.time() + timeout
|
|
if timeout >= 5:
|
|
when = ceil(when)
|
|
|
|
return loop.call_at(when, _weakref_handle, (weakref.ref(ob), name))
|
|
|
|
|
|
def call_later(cb, timeout, loop): # type: ignore
|
|
if timeout is not None and timeout > 0:
|
|
when = loop.time() + timeout
|
|
if timeout > 5:
|
|
when = ceil(when)
|
|
return loop.call_at(when, cb)
|
|
|
|
|
|
class TimeoutHandle:
|
|
""" Timeout handle """
|
|
|
|
def __init__(
|
|
self, loop: asyncio.AbstractEventLoop, timeout: Optional[float]
|
|
) -> None:
|
|
self._timeout = timeout
|
|
self._loop = loop
|
|
self._callbacks = (
|
|
[]
|
|
) # type: List[Tuple[Callable[..., None], Tuple[Any, ...], Dict[str, Any]]]
|
|
|
|
def register(
|
|
self, callback: Callable[..., None], *args: Any, **kwargs: Any
|
|
) -> None:
|
|
self._callbacks.append((callback, args, kwargs))
|
|
|
|
def close(self) -> None:
|
|
self._callbacks.clear()
|
|
|
|
def start(self) -> Optional[asyncio.Handle]:
|
|
timeout = self._timeout
|
|
if timeout is not None and timeout > 0:
|
|
when = self._loop.time() + timeout
|
|
if timeout >= 5:
|
|
when = ceil(when)
|
|
return self._loop.call_at(when, self.__call__)
|
|
else:
|
|
return None
|
|
|
|
def timer(self) -> "BaseTimerContext":
|
|
if self._timeout is not None and self._timeout > 0:
|
|
timer = TimerContext(self._loop)
|
|
self.register(timer.timeout)
|
|
return timer
|
|
else:
|
|
return TimerNoop()
|
|
|
|
def __call__(self) -> None:
|
|
for cb, args, kwargs in self._callbacks:
|
|
with suppress(Exception):
|
|
cb(*args, **kwargs)
|
|
|
|
self._callbacks.clear()
|
|
|
|
|
|
class BaseTimerContext(ContextManager["BaseTimerContext"]):
|
|
pass
|
|
|
|
|
|
class TimerNoop(BaseTimerContext):
|
|
def __enter__(self) -> BaseTimerContext:
|
|
return self
|
|
|
|
def __exit__(
|
|
self,
|
|
exc_type: Optional[Type[BaseException]],
|
|
exc_val: Optional[BaseException],
|
|
exc_tb: Optional[TracebackType],
|
|
) -> None:
|
|
return
|
|
|
|
|
|
class TimerContext(BaseTimerContext):
|
|
""" Low resolution timeout context manager """
|
|
|
|
def __init__(self, loop: asyncio.AbstractEventLoop) -> None:
|
|
self._loop = loop
|
|
self._tasks = [] # type: List[asyncio.Task[Any]]
|
|
self._cancelled = False
|
|
|
|
def __enter__(self) -> BaseTimerContext:
|
|
task = current_task(loop=self._loop)
|
|
|
|
if task is None:
|
|
raise RuntimeError(
|
|
"Timeout context manager should be used " "inside a task"
|
|
)
|
|
|
|
if self._cancelled:
|
|
task.cancel()
|
|
raise asyncio.TimeoutError from None
|
|
|
|
self._tasks.append(task)
|
|
return self
|
|
|
|
def __exit__(
|
|
self,
|
|
exc_type: Optional[Type[BaseException]],
|
|
exc_val: Optional[BaseException],
|
|
exc_tb: Optional[TracebackType],
|
|
) -> Optional[bool]:
|
|
if self._tasks:
|
|
self._tasks.pop()
|
|
|
|
if exc_type is asyncio.CancelledError and self._cancelled:
|
|
raise asyncio.TimeoutError from None
|
|
return None
|
|
|
|
def timeout(self) -> None:
|
|
if not self._cancelled:
|
|
for task in set(self._tasks):
|
|
task.cancel()
|
|
|
|
self._cancelled = True
|
|
|
|
|
|
class CeilTimeout(async_timeout.timeout):
|
|
def __enter__(self) -> async_timeout.timeout:
|
|
if self._timeout is not None:
|
|
self._task = current_task(loop=self._loop)
|
|
if self._task is None:
|
|
raise RuntimeError(
|
|
"Timeout context manager should be used inside a task"
|
|
)
|
|
now = self._loop.time()
|
|
delay = self._timeout
|
|
when = now + delay
|
|
if delay > 5:
|
|
when = ceil(when)
|
|
self._cancel_handler = self._loop.call_at(when, self._cancel_task)
|
|
return self
|
|
|
|
|
|
class HeadersMixin:
|
|
|
|
ATTRS = frozenset(["_content_type", "_content_dict", "_stored_content_type"])
|
|
|
|
_content_type = None # type: Optional[str]
|
|
_content_dict = None # type: Optional[Dict[str, str]]
|
|
_stored_content_type = sentinel
|
|
|
|
def _parse_content_type(self, raw: str) -> None:
|
|
self._stored_content_type = raw
|
|
if raw is None:
|
|
# default value according to RFC 2616
|
|
self._content_type = "application/octet-stream"
|
|
self._content_dict = {}
|
|
else:
|
|
self._content_type, self._content_dict = cgi.parse_header(raw)
|
|
|
|
@property
|
|
def content_type(self) -> str:
|
|
"""The value of content part for Content-Type HTTP header."""
|
|
raw = self._headers.get(hdrs.CONTENT_TYPE) # type: ignore
|
|
if self._stored_content_type != raw:
|
|
self._parse_content_type(raw)
|
|
return self._content_type # type: ignore
|
|
|
|
@property
|
|
def charset(self) -> Optional[str]:
|
|
"""The value of charset part for Content-Type HTTP header."""
|
|
raw = self._headers.get(hdrs.CONTENT_TYPE) # type: ignore
|
|
if self._stored_content_type != raw:
|
|
self._parse_content_type(raw)
|
|
return self._content_dict.get("charset") # type: ignore
|
|
|
|
@property
|
|
def content_length(self) -> Optional[int]:
|
|
"""The value of Content-Length HTTP header."""
|
|
content_length = self._headers.get(hdrs.CONTENT_LENGTH) # type: ignore
|
|
|
|
if content_length is not None:
|
|
return int(content_length)
|
|
else:
|
|
return None
|
|
|
|
|
|
def set_result(fut: "asyncio.Future[_T]", result: _T) -> None:
|
|
if not fut.done():
|
|
fut.set_result(result)
|
|
|
|
|
|
def set_exception(fut: "asyncio.Future[_T]", exc: BaseException) -> None:
|
|
if not fut.done():
|
|
fut.set_exception(exc)
|
|
|
|
|
|
class ChainMapProxy(Mapping[str, Any]):
|
|
__slots__ = ("_maps",)
|
|
|
|
def __init__(self, maps: Iterable[Mapping[str, Any]]) -> None:
|
|
self._maps = tuple(maps)
|
|
|
|
def __init_subclass__(cls) -> None:
|
|
raise TypeError(
|
|
"Inheritance class {} from ChainMapProxy "
|
|
"is forbidden".format(cls.__name__)
|
|
)
|
|
|
|
def __getitem__(self, key: str) -> Any:
|
|
for mapping in self._maps:
|
|
try:
|
|
return mapping[key]
|
|
except KeyError:
|
|
pass
|
|
raise KeyError(key)
|
|
|
|
def get(self, key: str, default: Any = None) -> Any:
|
|
return self[key] if key in self else default
|
|
|
|
def __len__(self) -> int:
|
|
# reuses stored hash values if possible
|
|
return len(set().union(*self._maps)) # type: ignore
|
|
|
|
def __iter__(self) -> Iterator[str]:
|
|
d = {} # type: Dict[str, Any]
|
|
for mapping in reversed(self._maps):
|
|
# reuses stored hash values if possible
|
|
d.update(mapping)
|
|
return iter(d)
|
|
|
|
def __contains__(self, key: object) -> bool:
|
|
return any(key in m for m in self._maps)
|
|
|
|
def __bool__(self) -> bool:
|
|
return any(self._maps)
|
|
|
|
def __repr__(self) -> str:
|
|
content = ", ".join(map(repr, self._maps))
|
|
return f"ChainMapProxy({content})"
|