Fender is a collection of protocol buffer extensions for use in constructing PROTO/JSON APIs over HTTP.

Example

my/service.proto

package my.service;

import "fender/v1.proto";

message Request {
  optional id = 1 [(fender.v1.fender_field).present = true];
}

message Response {
  optional id = 1;
  optional name = 2;
}

service TheService {
  option (fender.v1.fender_service) = {
    address: "example.com",
    request_format: JSON,
    transport: HTTPS
  };

  rpc GetMe (Request) returns (Response) {
    option (fender.v1.fender_method) = {
      http_method: GET,
      http_path: "/me/{+id}",
      timeout_millis: 3000
    }
  }
}

This proto definition for TheService specifies that the method GetMe will make the following request

theService.GetMe({id: 'ABCDE'})

// Issues a GET request to 
https://example.com/me/ABCDE

// Sets the Accept header to application/json

// Parses the response into a Response object.

Other options on method are:

• request_body_field - takes a field from the request object and makes that the body of the request
• response_body_field - Takes the response body, and sets a particular field rather than constructing the message from the raw response. For example, when an API returns an array.

Dependencies

Fender requires the google protocol buffer descriptors. If you don't already have them in your proto files you can add a protos.json file with the following:

[
  {
    "git": "https://github.com/hassox/google-protos.git"
  },
  {
    "git": "https://github.com/hassox/fender.git"
  }
]