98 lines
3.0 KiB
Python
98 lines
3.0 KiB
Python
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"""Utility functions for aiohappyeyeballs."""
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import ipaddress
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import socket
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from typing import Dict, List, Optional, Tuple, Union
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from .types import AddrInfoType
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def addr_to_addr_infos(
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addr: Optional[
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Union[Tuple[str, int, int, int], Tuple[str, int, int], Tuple[str, int]]
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],
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) -> Optional[List[AddrInfoType]]:
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"""Convert an address tuple to a list of addr_info tuples."""
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if addr is None:
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return None
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host = addr[0]
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port = addr[1]
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is_ipv6 = ":" in host
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if is_ipv6:
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flowinfo = 0
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scopeid = 0
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addr_len = len(addr)
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if addr_len >= 4:
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scopeid = addr[3] # type: ignore[misc]
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if addr_len >= 3:
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flowinfo = addr[2] # type: ignore[misc]
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addr = (host, port, flowinfo, scopeid)
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family = socket.AF_INET6
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else:
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addr = (host, port)
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family = socket.AF_INET
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return [(family, socket.SOCK_STREAM, socket.IPPROTO_TCP, "", addr)]
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def pop_addr_infos_interleave(
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addr_infos: List[AddrInfoType], interleave: Optional[int] = None
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) -> None:
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"""
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Pop addr_info from the list of addr_infos by family up to interleave times.
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The interleave parameter is used to know how many addr_infos for
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each family should be popped of the top of the list.
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"""
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seen: Dict[int, int] = {}
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if interleave is None:
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interleave = 1
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to_remove: List[AddrInfoType] = []
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for addr_info in addr_infos:
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family = addr_info[0]
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if family not in seen:
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seen[family] = 0
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if seen[family] < interleave:
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to_remove.append(addr_info)
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seen[family] += 1
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for addr_info in to_remove:
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addr_infos.remove(addr_info)
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def _addr_tuple_to_ip_address(
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addr: Union[Tuple[str, int], Tuple[str, int, int, int]],
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) -> Union[
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Tuple[ipaddress.IPv4Address, int], Tuple[ipaddress.IPv6Address, int, int, int]
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]:
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"""Convert an address tuple to an IPv4Address."""
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return (ipaddress.ip_address(addr[0]), *addr[1:])
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def remove_addr_infos(
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addr_infos: List[AddrInfoType],
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addr: Union[Tuple[str, int], Tuple[str, int, int, int]],
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) -> None:
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"""
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Remove an address from the list of addr_infos.
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The addr value is typically the return value of
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sock.getpeername().
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"""
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bad_addrs_infos: List[AddrInfoType] = []
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for addr_info in addr_infos:
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if addr_info[-1] == addr:
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bad_addrs_infos.append(addr_info)
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if bad_addrs_infos:
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for bad_addr_info in bad_addrs_infos:
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addr_infos.remove(bad_addr_info)
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return
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# Slow path in case addr is formatted differently
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match_addr = _addr_tuple_to_ip_address(addr)
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for addr_info in addr_infos:
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if match_addr == _addr_tuple_to_ip_address(addr_info[-1]):
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bad_addrs_infos.append(addr_info)
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if bad_addrs_infos:
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for bad_addr_info in bad_addrs_infos:
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addr_infos.remove(bad_addr_info)
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return
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raise ValueError(f"Address {addr} not found in addr_infos")
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