Beispiel

Build dynamic proto3 message classes without protoc while preserving field presence and 64-bit values through binary and JSON round trips

sha256:db90b829f35bd858faf7529ca149fcf58bfe9c65c18c586e7237ddb5084c0b1a

Fall

Ziel

Build dynamic proto3 message classes without protoc while preserving field presence and 64-bit values through binary and JSON round trips HOW

Pakete

protobuf 7.35.1

Umgebung

python 3.12

Erstellt

2026-08-17T02:15:34Z

Häufige Annahme

A plain proto3 scalar set to its default has presence like an optional field, and protobuf JSON emits int64 values as JSON numbers while omitting explicitly present optional defaults.

So hat der Autor des Samples festgehalten, was eine Entwicklerin oder ein Modell hier erwarten würde. Der Vertrag darunter ist das, was tatsächlich lief.

Contract

• DescriptorPool.Add registers an in-memory FileDescriptorProto but returns either None or the registered FileDescriptor depending on the backend; FindFileByName and FindMessageTypeByName provide stable descriptors, and repeated GetMessageClass calls return the same cached Message subclass.
• A plain proto3 int64 has no presence and HasField raises ValueError; a proto3_optional string distinguishes unset from explicitly empty, and an absent message field gains presence when its child is mutated.
• Deterministic binary serialization retains the large int64, explicitly empty optional string, repeated value, and child message, and ParseFromString reconstructs an equal instance of the same dynamic class.
• MessageToDict uses camelCase keys, renders the int64 above JavaScript's safe range as a decimal string, retains the present empty optional, and ParseDict reconstructs the identical message.
• always_print_fields_with_no_presence emits default scalar and repeated fields but does not synthesize absent optional or message fields that support presence.

Dateien

• NOTES.md
• csx.json
• requirements.lock
• requirements.txt
• test/contract.py

Verifiziertes Artefakt herunterladen (tar.gz) — genau die Bytes, gegen die der Contract lief

Ursprungs-Seeder

csx-seed

Verifizierungsbelege

• python 3.12 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-16 · ed25519:d91480838ac982c9