Using Go, I'm attempting to fetch a few JSON responses concurrently from multiple endpoints. I'd like to attach each of these responses to fields in a struct or map and return this struct/map as a JSON object. (Backend for Frontend pattern). So I will make a web request to the Go application with some sort of identifier. It will in turn make several web requests, and compile the data into one large object to return as a response.
I'm using Fiber as my framework but any generic web framework would be similar:
app.Get("/requests/:identifier", func(c *fiber.Ctx) error {
identifier := c.Params("identifier")
timeout := 1600 * time.Millisecond
client := httpclient.NewClient(httpclient.WithHTTPTimeout(timeout))
res, err := client.Get("https://www.example.com/endpoint?id=" identifier, nil)
if err != nil{
logger.Error("Timout value exceeded")
return c.Status(503).SendString("Socket Timeout")
}
logger.Info("Fetch success: ")
// Heimdall returns the standard *http.Response object
body, err := ioutil.ReadAll(res.Body)
code := 200
response := &main_response{
Service1: body,
}
return c.Status(code).JSON(response)
})
The problem I'm having is, I have no need to unmarshal this data in Go, as I have no use for it (I am simply passing it along). Do I have to unmarshal it just so I can set it as a field in my response struct like this?
type main_response struct {
Service1 []byte `json:"service1"`
Service2 map[string]string `json:"service2"`
Service3 map[string]interface{} `json:"service3"`
}
(I've tried a few different ways to accomplish this. Trying to use a byte array seems to base64 encode the responses)
I will want to marshal that struct to JSON before returning it, so perhaps I have little choice as I can't think of a way to tell Go "only marshal the main struct, everything else is already JSON". It almost feels like I'd be better off building a string at this point.
CodePudding user response:
Use json.RawMessage to copy a []byte
containing JSON directly to the response JSON document:
type main_response struct {
Service1 json.RawMessage `json:"service1"`
...
}
response := &main_response{
Service1: body,
}
return c.Status(code).JSON(response)