I want to save a file from an incoming POST request and upon request return the file in a GET request as JSON data.

[Hugh Myrie]

Here is what I have tried.

type product struct {

ID    int     `json:"id"`

Description  string  `json:"description"`

Price   float64  `json:"price"`

Bin string  `json:"bin"`

Qoh int  `json:"qoh"`

}

// ********* function to save data to a file *********//

func saveBackup(w http.ResponseWriter, r *http.Request) {

type Resp struct {

Message string `json:"message"`

Affected string `json:"affected"`

}

resp:= Resp{}

for k, v := range r.URL.Query() {

kee = k

val = v[0]

            }

fileName :=  val         // r.FormValue("filename")

bodyBytes, err := ioutil.ReadAll(r.Body)

var items product

json.Unmarshal(bodyBytes, &items)

fmt.Printf("%+v\n",items)

    f, err := os.Create(fileName)

    if err != nil {

        fmt.Println(err)

        return

    }

    l, err := f.Write(bodyBytes)

    if err != nil {

        fmt.Println(err)

        f.Close()

        return

    }

    fmt.Println(l, "bytes written successfully")

    err = f.Close()

    if err != nil {

        fmt.Println(err)

        return

    }

resp.Message = "Save successful"

resp.Affected = "Saved"

respondWithJSON(w, http.StatusOK, resp)

}

//******** Retrieving the file ********** //

func getBackup(w http.ResponseWriter, r *http.Request) {

kee := ""

fileName := ""

for k, v := range r.URL.Query() {

kee = k

 fileName = v[0]

            }

var lines []product    <=== []string  -  had this prior to scan Text

    file, err := os.Open(fileName)

    if err != nil {

        log.Fatal(err)

    }

    defer func() {

        if err = file.Close(); err != nil {

            log.Fatal(err)

        }

    }()

// scanner := bufio.NewScanner(file)

//    for scanner.Scan() {

//        lines = append(lines, scanner.Text())

//    }

b, err := ioutil.ReadFile(file)

     append(lines, b)    <== I know this is wrong

response, _ := json.Marshal(lines)

    w.Header().Set("Content-Type", "application/json")

    w.WriteHeader(http.StatusOK)

    w.Write(response)

}

How can I return the result as a JSON file to the requesting application? The client application parses the result to load into an array.

[Tamás Gulácsi]

If I understand correctly, you receive "bodyBytes", store it in a file, and later want to serve it.

Then a `w.Write(b)` would suffice.

Or without reading the whole file into memory: `io.Copy(w, file)`.

[Hugh Myrie]

Brilliant!! Thanks Tamas, that worked perfectly.