ProtoFile.service.method.options contain 3 unknown bytes

[Maaaaaaaa12138]

Here's my proto file.

service TestService {
  rpc GetTest (TestRequest) returns (TestResponse) {
    option (pb_idl.api_method).serializer="json";
  }
}

However，there are 3 unknown bytes in ProtoFile.service.method.options.
I want to know what these 3 bytes mean.

[garyp]

Can you please share the definition of the (pb_idl.api_method).serializer field and the extend google.protobuf.MethodOptions definition you're using?

I'm assuming that pb_idl.api_method is defined as a protobuf message and serializer is defined as a string field within that message. In which case, the byte values are probably:

[0] = 6  // length in bytes of the `pb_idl.api_method` message that follows 
[1] = 26 // field number and wire type of the `serializer` field
[2] = 4  // length in bytes of the string "json" that follows
[3] = 106  // "j"
[4] = 115  // "s"
[5] = 111  // "o"
[6] = 110  // "n"

You can see an explanation at https://developers.google.com/protocol-buffers/docs/encoding#structure of how field number and wire type are combined into one value.

[Maaaaaaaa12138]

thx buddy.
Here's my definition of (pb_idl.api_method).serializer filed and the extend google.ptotobuf.MethodOptions:

message ApiMethod {
    string serializer = 3;
}


extend google.protobuf.MethodOptions{
    ApiMethod api_method = 50200;
}

[garyp]

Thanks. Yeah that matches my explanation above then. The value 26 is a result of (fieldNumber << 3) | wireType, where fieldNumber = 3 and wireType = 2 for your serializer field. Or in Kotlin syntax: fieldNumber.shl(3).or(wireType).