explicit raise from

v6d0auth/app.py

@@ -81,8 +81,8 @@ class V6D0AuthAppFactory(AppFactory):
         async def pull(request: web.Request):
             try:
                 pulled = await pulled_for_request(request)
-            except KeyError:
-                raise web.HTTPNotFound
+            except KeyError as e:
+                raise web.HTTPNotFound from e
             else:
                 return web.Response(body=pulled)
 

v6d0auth/client.py

@@ -3,7 +3,7 @@ from nacl.exceptions import BadSignatureError
 from nacl.signing import VerifyKey
 
 from v6d0auth import certs
-from v6d0auth.config import myroot, caurl
+from v6d0auth.config import caurl, myroot
 
 __all__ = ('request_signature', 'mycert', 'has_role', 'request_role', 'with_role',)
 
@@ -17,8 +17,8 @@ async def request_signature() -> bytes:
             await ws.send_bytes(certs.vkey.encode())
             try:
                 return await ws.receive_bytes()
-            except TypeError:
-                raise RuntimeError("signature request failed")
+            except TypeError as e:
+                raise RuntimeError("signature request failed") from e
 
 
 _certfile = myroot / 'cert'
@@ -49,8 +49,8 @@ async def request_role(role: str) -> bytes:
             await ws.send_bytes(certs.vkey.encode())
             try:
                 return await ws.receive_bytes()
-            except TypeError:
-                raise RuntimeError("role request failed")
+            except TypeError as e:
+                raise RuntimeError("role request failed") from e
 
 
 async def with_role(role: str):