exec.go

func (h *Handler) exec(requestBody utils.JsonIn) (*utils.JsonOut, error) {
	cmd := exec.Command(h.Command)
	cmd.Dir = h.WorkingDir
	bRequestBody, err := json.Marshal(requestBody)
	if err != nil {
		return nil, err
	}
	cmd.Stdin = strings.NewReader(string(bRequestBody))
	var out bytes.Buffer
	cmd.Stdout = &out
	if err := cmd.Run(); err != nil {
		return nil, err
	}
	var response utils.JsonOut
	if err := json.Unmarshal(out.Bytes(), &response); err != nil {
		return nil, err
	}
	return &response, nil
}

exec.json

{
  "name": "/location/geocode",
  "endpoint": "/location/geocode",
  "env": [
    "CLIENT=mapbox",
    "MAPBOX_ACCESS_TOKEN=abc",
    "FN_FORMAT=json",
    "FN_TYPE=sync"
  ],
  "working_dir": "/Users/duocnguyen/go/src/code.go1.com.au/microservices/location",
  "command": "/usr/local/bin/go run /Users/duocnguyen/go/src/code.go1.com.au/microservices/location/geocode/func.go"
}

exec.Command("/usr/local/bin/go", "run", "/Users/duocnguyen/go/src/code.go1.com.au/microservices/location/geocode/func.go")