utils.py•3.03 kB
"""Utility functions for aiohappyeyeballs."""
import ipaddress
import socket
from typing import Dict, List, Optional, Tuple, Union
from .types import AddrInfoType
def addr_to_addr_infos(
addr: Optional[
Union[Tuple[str, int, int, int], Tuple[str, int, int], Tuple[str, int]]
],
) -> Optional[List[AddrInfoType]]:
"""Convert an address tuple to a list of addr_info tuples."""
if addr is None:
return None
host = addr[0]
port = addr[1]
is_ipv6 = ":" in host
if is_ipv6:
flowinfo = 0
scopeid = 0
addr_len = len(addr)
if addr_len >= 4:
scopeid = addr[3] # type: ignore[misc]
if addr_len >= 3:
flowinfo = addr[2] # type: ignore[misc]
addr = (host, port, flowinfo, scopeid)
family = socket.AF_INET6
else:
addr = (host, port)
family = socket.AF_INET
return [(family, socket.SOCK_STREAM, socket.IPPROTO_TCP, "", addr)]
def pop_addr_infos_interleave(
addr_infos: List[AddrInfoType], interleave: Optional[int] = None
) -> None:
"""
Pop addr_info from the list of addr_infos by family up to interleave times.
The interleave parameter is used to know how many addr_infos for
each family should be popped of the top of the list.
"""
seen: Dict[int, int] = {}
if interleave is None:
interleave = 1
to_remove: List[AddrInfoType] = []
for addr_info in addr_infos:
family = addr_info[0]
if family not in seen:
seen[family] = 0
if seen[family] < interleave:
to_remove.append(addr_info)
seen[family] += 1
for addr_info in to_remove:
addr_infos.remove(addr_info)
def _addr_tuple_to_ip_address(
addr: Union[Tuple[str, int], Tuple[str, int, int, int]],
) -> Union[
Tuple[ipaddress.IPv4Address, int], Tuple[ipaddress.IPv6Address, int, int, int]
]:
"""Convert an address tuple to an IPv4Address."""
return (ipaddress.ip_address(addr[0]), *addr[1:])
def remove_addr_infos(
addr_infos: List[AddrInfoType],
addr: Union[Tuple[str, int], Tuple[str, int, int, int]],
) -> None:
"""
Remove an address from the list of addr_infos.
The addr value is typically the return value of
sock.getpeername().
"""
bad_addrs_infos: List[AddrInfoType] = []
for addr_info in addr_infos:
if addr_info[-1] == addr:
bad_addrs_infos.append(addr_info)
if bad_addrs_infos:
for bad_addr_info in bad_addrs_infos:
addr_infos.remove(bad_addr_info)
return
# Slow path in case addr is formatted differently
match_addr = _addr_tuple_to_ip_address(addr)
for addr_info in addr_infos:
if match_addr == _addr_tuple_to_ip_address(addr_info[-1]):
bad_addrs_infos.append(addr_info)
if bad_addrs_infos:
for bad_addr_info in bad_addrs_infos:
addr_infos.remove(bad_addr_info)
return
raise ValueError(f"Address {addr} not found in addr_infos")