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Wed, 18 Nov 2020 15:58:58 +0100 (CET) From: Markus Armbruster To: John Snow Subject: Re: [PATCH v2 03/16] qapi/expr.py: constrain incoming expression types References: <20201026213637.47087-1-jsnow@redhat.com> <20201026213637.47087-4-jsnow@redhat.com> Date: Wed, 18 Nov 2020 15:58:58 +0100 In-Reply-To: <20201026213637.47087-4-jsnow@redhat.com> (John Snow's message of "Mon, 26 Oct 2020 17:36:24 -0400") Message-ID: <87ft56iudp.fsf@dusky.pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=armbru@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain Received-SPF: pass client-ip=63.128.21.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/17 19:41:43 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Cleber Rosa , qemu-devel@nongnu.org, Eduardo Habkost , Markus Armbruster Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" John Snow writes: > mypy does not know the types of values stored in Dicts that masquerade > as objects. Help the type checker out by constraining the type. I'm not sure I understand what you mean by "dict masquerading as object". > > Signed-off-by: John Snow > Reviewed-by: Eduardo Habkost > Reviewed-by: Cleber Rosa > --- > scripts/qapi/expr.py | 25 ++++++++++++++++++++++--- > 1 file changed, 22 insertions(+), 3 deletions(-) > > diff --git a/scripts/qapi/expr.py b/scripts/qapi/expr.py > index 5694c501fa38..f7c7f91326ef 100644 > --- a/scripts/qapi/expr.py > +++ b/scripts/qapi/expr.py > @@ -15,9 +15,17 @@ > # See the COPYING file in the top-level directory. > > import re > +from typing import MutableMapping, Optional > > from .common import c_name > from .error import QAPISemError > +from .parser import QAPIDoc > +from .source import QAPISourceInfo > + > + > +# Expressions in their raw form are JSON-like structures with arbitrary forms. > +# Minimally, their top-level form must be a mapping of strings to values. PEP 8: "For flowing long blocks of text with fewer structural restrictions (docstrings or comments), the line length should be limited to 72 characters." > +Expression = MutableMapping[str, object] > > > # Names must be letters, numbers, -, and _. They must start with letter, > @@ -287,9 +295,20 @@ def check_event(expr, info): > > def check_exprs(exprs): > for expr_elem in exprs: > - expr = expr_elem['expr'] > - info = expr_elem['info'] > - doc = expr_elem.get('doc') dict is arguably a rather awkward choice here. I figure a named tuple would be neater. A class feels like overkill. Observation, not demand. > + # Expression > + assert isinstance(expr_elem['expr'], dict) > + expr: Expression = expr_elem['expr'] > + for key in expr.keys(): > + assert isinstance(key, str) > + > + # QAPISourceInfo > + assert isinstance(expr_elem['info'], QAPISourceInfo) > + info: QAPISourceInfo = expr_elem['info'] > + > + # Optional[QAPIDoc] > + tmp = expr_elem.get('doc') > + assert tmp is None or isinstance(tmp, QAPIDoc) > + doc: Optional[QAPIDoc] = tmp > > if 'include' in expr: > continue I hope further typing work will reduce the isinstance() assertions again.