How to Effectively Parse Multi-Source Data in HTTP Requests with Go?

Parsing File and JSON Data from a Single HTTP Request with Go

Parsing data from multiple sources within a single HTTP request can be challenging. In this case, we're receiving both a PDF file and JSON data as separate parts. To effectively handle this scenario, Go provides the multipart/form-data package.

Solution:

The key to resolving this issue is to use r.MultipartReader(). This function returns a mime/multipart.Reader object, allowing us to iterate over each part of the request and process them individually. Here's the modified code:

<code class="go">func (s *Server) PostFileHandler(w http.ResponseWriter, r *http.Request) {
    mr, err := r.MultipartReader()
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }

    doc := Doc{}
    for {
        part, err := mr.NextPart()

        // End of parts
        if err == io.EOF {
            break
        }

        // Handle PDF 'file' part
        if part.FormName() == "file" {
            // ... PDF processing code
        }

        // Handle JSON 'doc' part
        if part.FormName() == "doc" {
            jsonDecoder := json.NewDecoder(part)
            err = jsonDecoder.Decode(&doc)
            if err != nil {
                http.Error(w, err.Error(), http.StatusInternalServerError)
                return
            }
            // ... JSON processing code
        }
    }

    // ... Database insertion and response handling code
}</code>

Using this approach, we can separately parse the PDF file and JSON data, ensuring both parts of the request are processed correctly.

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