add StrEnum and async sock recv compat for python < 3.11

pyroute2/compat.py

@@ -0,0 +1,14 @@
+'''Compatibility with older but supported Python versions'''
+
+try:
+    from enum import StrEnum
+except ImportError:
+    # StrEnum appeared in python 3.11
+
+    from enum import Enum
+
+    class StrEnum(str, Enum):
+        '''Same as enum, but members are also strings.'''
+
+
+__all__ = ('StrEnum',)

pyroute2/dhcp/dhcp4socket.py

@@ -150,7 +150,7 @@ async def get(self) -> dhcp4msg:
         only MAC/IPv4/UDP headers are stripped out, and the
         rest is interpreted as DHCP.
         '''
-        data, _ = await self.aio_loop.sock_recvfrom(self, 4096)
+        data = await self.aio_loop.sock_recv(self, 4096)
         eth = ethmsg(buf=data).decode()
         ip4 = ip4msg(buf=data, offset=eth.offset).decode()
         udp = udpmsg(buf=data, offset=ip4.offset).decode()

pyroute2/dhcp/fsm.py

@@ -1,9 +1,11 @@
 '''DHCP client state machine helpers.'''
 
-from enum import StrEnum, auto
+from enum import auto
 from logging import getLogger
 from typing import TYPE_CHECKING, Final
 
+from pyroute2.compat import StrEnum
+
 if TYPE_CHECKING:
     from .client import AsyncDHCPClient