Sample
protobuf 7.35.1: Build dynamic proto3 message classes without protoc while preserving field presence and 64-bit values through binary and JSON round trips
Verified sample for pypi protobuf 7.35.1: Build dynamic proto3 message classes without protoc while preserving field presence and 64-bit values through…
sha256:db90b829f35bd858faf7529ca149fcf58bfe9c65c18c586e7237ddb5084c0b1a
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
python 3.12 linux alpine · musl x64 python 3.12 python 3.12 pip
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| python 3.12 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1 |
2026-08-16 |
| python 3.12 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1 |
2026-08-18 |
Case
HOW- Goal
- Build dynamic proto3 message classes without protoc while preserving field presence and 64-bit values through binary and JSON round trips
- Packages
- Symbols
-
- google.protobuf.descriptor_pb2.FileDescriptorProto
- google.protobuf.descriptor_pool.DescriptorPool.Add
- google.protobuf.descriptor_pool.DescriptorPool.FindFileByName
- google.protobuf.descriptor_pool.DescriptorPool.FindMessageTypeByName
- google.protobuf.message_factory.GetMessageClass
- google.protobuf.message.Message.HasField
- google.protobuf.message.Message.SerializeToString
- google.protobuf.message.Message.ParseFromString
- google.protobuf.json_format.MessageToDict
- google.protobuf.json_format.ParseDict
- Environment
- python 3.12
- Created
- 2026-08-17T02:15:34Z
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.
Files
- NOTES.md
- csx.json
- requirements.lock
- requirements.txt
- test/contract.py