I am new to grpc and have been trying to just fetch a json response from a webserver. The stub can then request the json from the rpc server.
In my .proto file, I created a message type:
message Post {
int64 number = 1;
string now = 2;
string name = 3;
}
But I am not able to marshal the number field, since protoc produces the struct pb.go file with a number tag:
{
"no": "23",
"now": "12:06:46",
"name": "bob"
}
How can I force the Message to be 'converted' with a tag other than the lowercase name of the message field? Such as using the json tag no, even if the field name in the Message is number.
import "github.com/gogo/protobuf/gogoproto/gogo.proto";
// Result example:
// type Post struct {
// Number int64 `protobuf:"bytes,1,opt,name=number,json=no1,proto3" json:"no2"`
// }
message Post {
int64 number = 1 [json_name="no1", (gogoproto.jsontag) = "no2"];
}
,where:
jsonpb example:
import (
"bytes"
"testing"
"encoding/json"
"github.com/golang/protobuf/jsonpb"
"github.com/stretchr/testify/require"
)
func TestJSON(t *testing.T) {
msg := &Post{
Number: 1,
}
buf := bytes.NewBuffer(nil)
require.NoError(t, (&jsonpb.Marshaler{}).Marshal(buf, msg))
require.Equal(t, `{"no1":1}`, buf.String())
buf.Truncate(0)
require.NoError(t, json.NewEncoder(buf).Encode(msg))
require.Equal(t, `{"no2":1}`, buf.String())
}
More information about protobuf extensions
You can set a proto3 field option on the proto message definition with a json_name
message Post {
int64 number = 1 [json_name="no"];
string now = 2;
string name = 3;
}