Remove use of multiprocessing from the OAuth client (flyteorg#2626)

* Remove use of multiprocessing from the OAuth client

Signed-off-by: Robert Deaton <robert.deaton@freenome.com>

* Lint

Signed-off-by: Robert Deaton <robert.deaton@freenome.com>

---------

Signed-off-by: Robert Deaton <robert.deaton@freenome.com>

flytekit/clients/auth/auth_client.py

@@ -4,15 +4,14 @@
 import hashlib
 import http.server as _BaseHTTPServer
 import logging
-import multiprocessing
 import os
 import re
 import typing
 import urllib.parse as _urlparse
 import webbrowser
 from dataclasses import dataclass
 from http import HTTPStatus as _StatusCodes
-from multiprocessing import get_context
+from queue import Queue
 from urllib.parse import urlencode as _urlencode
 
 import click
@@ -124,7 +123,7 @@ def __init__(
         request_handler_class: typing.Type[_BaseHTTPServer.BaseHTTPRequestHandler],
         bind_and_activate: bool = True,
         redirect_path: str = None,
-        queue: multiprocessing.Queue = None,
+        queue: Queue = None,
     ):
         _BaseHTTPServer.HTTPServer.__init__(self, server_address, request_handler_class, bind_and_activate)
         self._redirect_path = redirect_path
@@ -142,9 +141,8 @@ def remote_metadata(self) -> EndpointMetadata:
 
     def handle_authorization_code(self, auth_code: str):
         self._queue.put(auth_code)
-        self.server_close()
 
-    def handle_request(self, queue: multiprocessing.Queue = None) -> typing.Any:
+    def handle_request(self, queue: Queue = None) -> typing.Any:
         self._queue = queue
         return super().handle_request()
 
@@ -345,26 +343,21 @@ def get_creds_from_remote(self) -> Credentials:
         retrieve credentials
         """
         # In the absence of globally-set token values, initiate the token request flow
-        ctx = get_context("fork")
-        q = ctx.Queue()
+        q = Queue()
 
         # First prepare the callback server in the background
         server = self._create_callback_server()
 
-        server_process = ctx.Process(target=server.handle_request, args=(q,))
-        server_process.daemon = True
+        self._request_authorization_code()
 
-        try:
-            server_process.start()
+        server.handle_request(q)
+        server.server_close()
 
-            # Send the call to request the authorization code in the background
-            self._request_authorization_code()
+        # Send the call to request the authorization code in the background
 
-            # Request the access token once the auth code has been received.
-            auth_code = q.get()
-            return self._request_access_token(auth_code)
-        finally:
-            server_process.terminate()
+        # Request the access token once the auth code has been received.
+        auth_code = q.get()
+        return self._request_access_token(auth_code)
 
     def refresh_access_token(self, credentials: Credentials) -> Credentials:
         if credentials.refresh_token is None: