fix: A42 terminé — client httpx partagé par boucle (v7.28.0)

- `app/services/http_client.py` : `async with shared_client(timeout=15)
  as client:` remplace les 49 créations `async with httpx.AsyncClient(`
  de 14 fichiers (gitea ×21, providers oidc/oauth ×11, calendar ×4,
  automations ×3…) — le pool de connexions est réutilisé au lieu d'être
  recréé à chaque appel. __aexit__ no-op (le client partagé ne se ferme
  pas à la sortie).
- Cache par (boucle d'event, kwargs) en WeakKeyDictionary : un
  AsyncClient n'est JAMAIS partagé entre deux loops (piège des tests
  « Event loop is closed ») — une boucle par test = client propre
  collecté avec la boucle. Clé = kwargs triés, repr() pour les valeurs
  non hashables (`headers=` dict → TypeError rattrapé par la suite).
- Laissés délibérément : github_adapter (transport MockTransport
  injecté), webhook_outbound (client « own_client » fermé par la
  fonction).
- Tests : `test_http_client_shared_and_loop_scoped` (réutilisation mêmes
  kwargs / cloisonné kwargs / cloisonné loop) ; le stub des webhooks
  patche aussi la fabrique `http_client.httpx` + purge du cache (avant :
  webhook_outbound.httpx patché mais la fabrique partagée créait un vrai
  client → réseau réel dans les tests).

suite **1091/1091** · ruff OK · docs à jour

app/auth/oauth.py

@@ -4,9 +4,8 @@ from __future__ import annotations
 import logging
 from urllib.parse import urlencode
 
-import httpx
-
 from app.config import settings
+from app.services.http_client import shared_client
 
 logger = logging.getLogger(__name__)
 
@@ -39,7 +38,7 @@ class GiteaOAuth:
     async def exchange_code(self, code: str) -> dict | None:
         """Exchange authorization code for access token."""
         try:
-            async with httpx.AsyncClient(timeout=15) as client:
+            async with shared_client(timeout=15) as client:
                 resp = await client.post(
                     self.TOKEN_URL,
                     data={
@@ -61,7 +60,7 @@ class GiteaOAuth:
     async def get_user(self, access_token: str) -> dict | None:
         """Get user info from Gitea API."""
         try:
-            async with httpx.AsyncClient(timeout=10) as client:
+            async with shared_client(timeout=10) as client:
                 resp = await client.get(
                     self.USER_URL,
                     headers={"Authorization": f"token {access_token}"},

app/auth/providers/__init__.py

@@ -7,7 +7,7 @@ import time
 from abc import ABC, abstractmethod
 from urllib.parse import urlencode
 
-import httpx
+from app.services.http_client import shared_client
 
 logger = logging.getLogger(__name__)
 
@@ -76,7 +76,7 @@ class GiteaProvider(OAuthProvider):
             "grant_type": "authorization_code",
             "redirect_uri": redirect_uri or self.redirect_uri,
         }
-        async with httpx.AsyncClient(timeout=15) as client:
+        async with shared_client(timeout=15) as client:
             r = await client.post(url, json=data, headers={"Accept": "application/json"})
             if r.status_code != 200:
                 logger.error("Gitea token exchange failed: %s", r.text)
@@ -85,7 +85,7 @@ class GiteaProvider(OAuthProvider):
 
     async def get_user(self, access_token: str) -> dict | None:
         url = f"{self.base}/api/v1/user"
-        async with httpx.AsyncClient(timeout=15) as client:
+        async with shared_client(timeout=15) as client:
             r = await client.get(url, headers={"Authorization": f"token {access_token}"})
             if r.status_code != 200:
                 return None
@@ -100,7 +100,7 @@ class GiteaProvider(OAuthProvider):
 
     async def list_repositories(self, access_token: str) -> list[dict]:
         repos = []
-        async with httpx.AsyncClient(timeout=30) as client:
+        async with shared_client(timeout=30) as client:
             for page in range(1, 6):
                 r = await client.get(
                     f"{self.base}/api/v1/user/repos",
@@ -158,7 +158,7 @@ class GitHubProvider(OAuthProvider):
         )
 
     async def exchange_code(self, code: str, redirect_uri: str | None = None) -> dict | None:
-        async with httpx.AsyncClient(timeout=15) as client:
+        async with shared_client(timeout=15) as client:
             r = await client.post(
                 self.token_url,
                 data={
@@ -179,7 +179,7 @@ class GitHubProvider(OAuthProvider):
 
     async def get_user(self, access_token: str) -> dict | None:
         url = f"{self.api_url}/user"
-        async with httpx.AsyncClient(timeout=15) as client:
+        async with shared_client(timeout=15) as client:
             r = await client.get(
                 url,
                 headers={"Authorization": f"Bearer {access_token}", "Accept": "application/vnd.github.v3+json"},
@@ -197,7 +197,7 @@ class GitHubProvider(OAuthProvider):
 
     async def list_repositories(self, access_token: str) -> list[dict]:
         repos = []
-        async with httpx.AsyncClient(timeout=30) as client:
+        async with shared_client(timeout=30) as client:
             for page in range(1, 6):
                 r = await client.get(
                     f"{self.api_url}/user/repos",

app/auth/providers/oidc_provider.py

@@ -15,7 +15,7 @@ import secrets
 import time
 import warnings
 
-import httpx
+from app.services.http_client import shared_client
 
 logger = logging.getLogger(__name__)
 
@@ -59,7 +59,7 @@ async def discover(issuer_url: str) -> dict:
     if hit and now - hit[0] < _DISCOVERY_TTL:
         return hit[1]
     try:
-        async with httpx.AsyncClient(timeout=15) as client:
+        async with shared_client(timeout=15) as client:
             r = await client.get(url)
             r.raise_for_status()
             doc = r.json()
@@ -112,7 +112,7 @@ async def exchange_code(
     if client_secret:
         auth = (client_id, client_secret)
     try:
-        async with httpx.AsyncClient(timeout=15) as client:
+        async with shared_client(timeout=15) as client:
             r = await client.post(doc["token_endpoint"], data=data, auth=auth)
     except Exception as err:
         raise OIDCError(f"OIDC token request failed: {err}") from err
@@ -133,7 +133,7 @@ async def fetch_userinfo(doc: dict, access_token: str) -> dict:
     if not endpoint or not access_token:
         return {}
     try:
-        async with httpx.AsyncClient(timeout=15) as client:
+        async with shared_client(timeout=15) as client:
             r = await client.get(endpoint, headers={"Authorization": f"Bearer {access_token}"})
         if r.status_code != 200:
             return {}