fix(svn): fix the problems of reading txn_id when used gunicorn/waitress + traefik/no-traefik combinations

rhodecode/lib/middleware/simplevcs.py

@@ -605,7 +605,18 b' class SimpleVCS(object):'
             # case for SVN, we want to re-use the callback daemon port
             # so we use the txn_id, for this we peek the body, and still save
             # it as wsgi.input
-            data: str = safe_str(environ['wsgi.input'].getvalue())
+
+            stream = environ['wsgi.input']
+
+            if isinstance(stream, io.BytesIO):
+                data: str = safe_str(stream.getvalue())
+            elif hasattr(stream, 'buf'):  # most likely gunicorn.http.body.Body
+                data: str = safe_str(stream.buf.getvalue())
+            else:
+                # fallback to the crudest way, copy the iterator
+                data = safe_str(stream.read())
+                environ['wsgi.input'] = io.BytesIO(safe_bytes(data))
+
             txn_id = extract_svn_txn_id(self.acl_repo_name, data)
 
         callback_daemon, extras = self._prepare_callback_daemon(