From c295938d04333755ed269a17cd0e74563f0bcd9a Mon Sep 17 00:00:00 2001
From: Chris Burr <chrisburr@users.noreply.github.com>
Date: Mon, 28 Apr 2025 11:05:40 +0200
Subject: [PATCH] Revert "feat (diracx): add a randomized connection pooling"

---
 docs/source/conf.py                           |  1 -
 src/DIRAC/FrameworkSystem/Utilities/diracx.py | 76 +------------------
 2 files changed, 2 insertions(+), 75 deletions(-)

diff --git a/docs/source/conf.py b/docs/source/conf.py
index e17191c8170..73f0b1dc3e0 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -306,7 +306,6 @@ def setup(app):
 intersphinx_mapping = {
     "python": ("https://docs.python.org/3/", None),
     "matplotlib": ("https://matplotlib.org/", None),
-    "requests": ("https://requests.readthedocs.io/en/latest/", None),
 }
 
 # check for :param / :return in html, points to faulty syntax, missing empty lines, etc.
diff --git a/src/DIRAC/FrameworkSystem/Utilities/diracx.py b/src/DIRAC/FrameworkSystem/Utilities/diracx.py
index 2a8d5d24c16..631e4167c3e 100644
--- a/src/DIRAC/FrameworkSystem/Utilities/diracx.py
+++ b/src/DIRAC/FrameworkSystem/Utilities/diracx.py
@@ -1,16 +1,11 @@
-import random
 import requests
 
 from cachetools import TTLCache, LRUCache, cached
 from cachetools.keys import hashkey
 from pathlib import Path
-from requests.adapters import HTTPAdapter
 from tempfile import NamedTemporaryFile
 from typing import Any
 from collections.abc import Generator
-from urllib3 import PoolManager
-from urllib3.connectionpool import HTTPConnectionPool, HTTPSConnectionPool
-
 from DIRAC import gConfig
 from DIRAC.ConfigurationSystem.Client.Helpers import Registry
 from contextlib import contextmanager
@@ -31,74 +26,7 @@
 DEFAULT_TOKEN_CACHE_TTL = 5 * 60
 DEFAULT_TOKEN_CACHE_SIZE = 1024
 
-# Number of pools to use for a given host.
-# It should be in the order of host behind the alias
-SESSION_NUM_POOLS = 20
-# Number of connection per Pool
-SESSION_CONNECTION_POOL_MAX_SIZE = 10
-
-
-class RandomizedPoolManager(PoolManager):
-    """
-    A PoolManager subclass that creates multiple connection pools per host.
-    Each connection request randomly picks one of the available pools.
-    """
-
-    def __init__(self, num_pools=3, **kwargs):
-        self.num_pools = num_pools
-        super().__init__(**kwargs)
-
-    def connection_from_host(self, host, port=None, scheme="http", pool_kwargs=None):
-        # Pick a random index to diversify the pool key.
-
-        rand_index = random.randint(0, self.num_pools - 1)
-        pool_key = (f"{host}-{rand_index}", port, scheme)
-        if pool_key in self.pools:
-            return self.pools[pool_key]
-
-        # Create a new pool if none exists for this key.
-        if scheme == "http":
-            self.pools[pool_key] = HTTPConnectionPool(host, port, **self.connection_pool_kw)
-        elif scheme == "https":
-            self.pools[pool_key] = HTTPSConnectionPool(host, port, **self.connection_pool_kw)
-        else:
-            raise ValueError(f"Unsupported scheme: {scheme}")
-
-        return self.pools[pool_key]
-
-
-class RandomizedHTTPAdapter(HTTPAdapter):
-    """
-    An HTTPAdapter that uses the RandomizedPoolManager.
-    """
-
-    def __init__(self, num_pools=3, maxsize=10, **kwargs):
-        self.num_pools = num_pools
-        self.custom_maxsize = maxsize
-        super().__init__(**kwargs)
-
-    def init_poolmanager(self, connections, maxsize, block=False, **pool_kwargs):
-        """
-        Initialize the pool manager with our custom RandomizedPoolManager.
-        """
-        # This ends up being passed to the HTTP(s)ConnectionPool constructors
-        pool_kwargs.update(
-            {
-                "maxsize": self.custom_maxsize,
-                "block": block,
-            }
-        )
-        self.poolmanager = RandomizedPoolManager(**pool_kwargs)
-
-
-# Create a requests session.
-diracx_session = requests.Session()
-# Create an instance of the custom adapter.
-diracx_pool_adapter = RandomizedHTTPAdapter(num_pools=SESSION_NUM_POOLS, maxsize=SESSION_CONNECTION_POOL_MAX_SIZE)
-
-# Mount the adapter to handle both HTTP and HTTPS.
-diracx_session.mount("http://", diracx_pool_adapter)
-diracx_session.mount("https://", diracx_pool_adapter)
+legacy_exchange_session = requests.Session()
 
 
 def get_token(
@@ -117,7 +45,7 @@ def get_token(
     vo = Registry.getVOForGroup(group)
     scopes = [f"vo:{vo}", f"group:{group}"] + [f"property:{prop}" for prop in dirac_properties]
 
-    r = diracx_session.get(
+    r = legacy_exchange_session.get(
         f"{diracxUrl}/api/auth/legacy-exchange",
         params={
             "preferred_username": username,