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feat(backends): use PEP544 protocols for structural subtyping #2442

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Feb 12, 2023
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34 changes: 34 additions & 0 deletions gitlab/_backends/protocol.py
Original file line number Diff line number Diff line change
@@ -0,0 +1,34 @@
import abc
import sys
from typing import Any, Dict, Optional, Union

import requests
from requests_toolbelt.multipart.encoder import MultipartEncoder # type: ignore

if sys.version_info >= (3, 8):
from typing import Protocol
else:
from typing_extensions import Protocol


class BackendResponse(Protocol):
@abc.abstractmethod
def __init__(self, response: requests.Response) -> None:
...


class Backend(Protocol):
@abc.abstractmethod
def http_request(
self,
method: str,
url: str,
json: Optional[Union[Dict[str, Any], bytes]],
data: Optional[Union[Dict[str, Any], MultipartEncoder]],
params: Optional[Any],
timeout: Optional[float],
verify: Optional[Union[bool, str]],
stream: Optional[bool],
**kwargs: Any,
) -> BackendResponse:
...
6 changes: 4 additions & 2 deletions gitlab/_backends/requests_backend.py
Original file line number Diff line number Diff line change
Expand Up @@ -6,8 +6,10 @@
from requests.structures import CaseInsensitiveDict
from requests_toolbelt.multipart.encoder import MultipartEncoder # type: ignore

from . import protocol

class RequestsResponse:

class RequestsResponse(protocol.BackendResponse):
def __init__(self, response: requests.Response) -> None:
self._response: requests.Response = response

Expand Down Expand Up @@ -35,7 +37,7 @@ def json(self) -> Any:
return self._response.json()


class RequestsBackend:
class RequestsBackend(protocol.Backend):
def __init__(self, session: Optional[requests.Session] = None) -> None:
self._client: requests.Session = session or requests.Session()

Expand Down