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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] |
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if addr_len >= 3: |
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flowinfo = addr[2] |
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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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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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