How to send bytes on gRPC request ?

[davidB]

Hi,

Thanks for your wonderful tool (documentation and samples). I discovered it last week-end when I was looking for a gRPC client (for demo & basic test). It already replaces the RestClient extension in my VS Code for HTTP(s) requests.

How to send (or define) a bytes field via gRPC?

e.g. a .proto likes

import "google/protobuf/empty.proto";

service MyService {
  rpc Store(StoreRequest) returns (google.protobuf.Empty) {}

  rpc Find(FindRequest) returns (StoreRequest) {}
}

message StoreRequest {
  string key = 1;
  bytes payload_binary = 2;
}

message FindRequest {
  string key = 1;
}

For all my tries, the server received an empty bytes array.

e.g. a failing try

proto < ./my.proto
defaults: true
bytes: String

#{{
#  const data = 'plob';
#  const buff = new Buffer(data, 'utf-8');
#  const base64data = buff.toString('base64');
#  exports.data = base64data;
#}}
@data=InBsb3AiCg==

###
GRPC {{server}}/{{service}}/Store
{
  "key": "tmp",
  "payload_binary": "{{data}}"
}

?? status == 0

###
GRPC {{server}}/{{service}}/Find
{
  "key": "tmp"
}

?? status == 0
?? body payload_binary == {{data}}

An auxiliary question: can I test the response for find?

PS: I'm not a js dev, so I don't understand fully the subtilities between the format Buffer, ArrayU8Int, String,... to represent the bytes in js and json.

[davidB]

I will answer to my own question (for future readers).
I got 2 errors in the code above.

1. as I used the name payload_binary I should enable the option keepCase: true else the expected name should be payloadBinary (that explain why I got empty value.
2. to be able to set the value and test it, I should base64 encode it.

So the working code is

proto < ./my.proto
defaults: true
keepCase: true
bytes: String

{{
  exports.data = new Buffer('plop azerty', 'utf-8').toString('base64');
}}


###
GRPC {{server}}/{{service}}/Store
{
  "key": "tmp",
  "payload_binary": "{{data}}"
}

?? status == 0

###
GRPC {{server}}/{{service}}/Find
{
  "key": "tmp"
}

?? status == 0
?? body payload_binary == {{data}}