Comments (4)
There are edge cases where a message can shrink between populating the size cache and encoding it, which would result in Go Protobuf producing invalid wire format. This would be a terrible outcome, so we’ll prevent producing invalid wire format by adding checks to Go Protobuf’s encoder that detect the situation and error out instead.
This check was added in commit protocolbuffers/protobuf-go@94bb78c
For readers from the future: If you see this error triggering (e.g. size mismatch (see https://github.com/golang/protobuf/issues/1609): calculated=36, measured=37
), the most likely reason for it is accidental sharing and concurrent mutation of a Protobuf message or submessage.
We fixed one case where a submessage was shared (defined in the server struct) between requests, but then each request handler would also modify that same submessage with per-request data. When you concurrently process requests, this results in modifying a protobuf message while marshaling (encoding) it, which is not permitted.
Instead of producing invalid wire format, Go Protobuf will error out. The fix is to change your code to not mutate Protobuf messages while marshaling (encoding).
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Related Issues (20)
- Support for optional fields HOT 2
- Latest version of google.golang.org/protobuf (v1.33.0) is no longer compatible with the latest version of github.com/golang/protobuf (v1.5.3) HOT 7
- Add option to JSON marshal / unmarshal: StripEnumPrefix / AddEnumPrefix HOT 10
- How to properly define protobuf `oneof` fields? HOT 2
- How can I import a pre-compiled proto from another package? HOT 4
- protodesc: feature "message_encoding" (in Protobuf editions) triggers proto2 group validation checks HOT 11
- timestamppb.AsTime is incorrectly implemented for nil/zero values HOT 2
- missing replace in go.mod HOT 1
- protojson: fail to unmarshal JSON with reserved fields HOT 19
- Parsing protoc plugin option containing ',' HOT 5
- go_features.proto has incorrect package and error-prone file path HOT 5
- feature: Generate test client / `bufconn` constructors HOT 4
- v1.33.0 breaks bazel build HOT 14
- Reflection: protopath parsing and path+message access HOT 7
- Proposal: Set go.mod Go language version to oldest supported Go version (1.21 currently) HOT 8
- Proposal: Add `Override` mode to `proto.Merge` HOT 2
- editions: maps are incorrectly serialized if file has default message encoding of DELIMITED HOT 7
- protodesc: too strict about proto3 field names when creating descriptors from FileDescriptorProto
- undefined: descriptorpb.Default_FileOptions_PhpGenericServices HOT 2
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