inputting json file from shell i converted using marshal the file but now i have to add metadata uui-CodePudding

Im inputing JSON file from shell and converting to specific format i did that part on bottom but im trying to include like metadat like time ,uuid and couple of other thing to it then printout the new json file.My issue i cant put the new info to data part of the data

package main

import (
        "encoding/json"
        "fmt"
        "io/ioutil"
        "os"
        "time"
//      "github.com/google/uuid"
)

func help() {
        fmt.Println("help")
}

type Event struct{
        Specversion string               `json:"specversion"`
        ID          string              `json:"id"`   /// uuid
        Source      string              `json:"source"`
//      Type        bool                `json:"type"`
        Time        time.Now             `json:"time"`
        Data        string       `json:"data"`  /// this part supposed to come from the file
}

func main(){

        if len(os.Args) < 1 { //checking for provided argument if the first arg satisfy then use read file
                fmt.Println("Usage : "   os.Args[0]   " file name")
                help()
                os.Exit(1)
        }

        file, err := ioutil.ReadFile(os.Args[1])
        if err != nil {
                fmt.Println("Cannot read the file or file does not exists")
                os.Exit(1)
        }

        out, err := json.Marshal(map[string]string{"data": string(file)})
        if err != nil {
                panic(err)
        }
        //fmt.Println(string(out))


e := Event{
Specversion: "1.0",
//id: uuid.New(),
Source: "CSS",
//type: true,
Time: time.Now(),
Data: data.(string),
}
fmt.Println(string(out))
fmt.Println(string(e))
//fmt.Println(string(id))

}

The outcome should be this

{
  "specversion": "1.0",
  "id": "ce20b92d-b45b-hhd7-a544-8fe4d8f7ff06",
  "source": "CCS",
  "type": "EVENT",
  "time": "2022-08-09T23:59:08.468903 00:00",
  "data": "{\"mac_address\": null, \".................

original file from input

 "mac_address": "",
  "serial_number": "j",
  "device_type": "STORAGE",
  "device_model": "VIRTUAL",
  "part_number": "VIRTUAL",
  "extra_attributes": [
    {
      "attribute_type": "ENTITLEMENT_ID",
      "attribute_value": "H6MI9JYNJCOSBL1GTjfgjfjY6P"

CodePudding user response：

The application marshals a map with the data, but not the metadata. The application configures a value with the metadata and data, but does nothing with it. Pull those pieces together. Something like this:

file, err := ioutil.ReadFile(os.Args[1])
if err != nil {
    fmt.Println("Cannot read the file or file does not exists")
    os.Exit(1)
}

e := Event{
    Specversion: "1.0",
    Source: "CSS",
    Time: time.Now(),
    Data: string(file),
}

out, _ := json.MarshalIndent(e, "", "  ")
fmt.Println(string(out))

Run the program on the playground.

CodePudding user response：

You can try the approach below for this:

package main

import (
    "encoding/json"
    "fmt"
    "io/ioutil"
    "os"
    "time"
    //      "github.com/google/uuid"
)

func help() {
    fmt.Println("help")
}

type Event struct {
    Specversion string `json:"specversion"`
    ID          string `json:"id"` /// uuid
    Source      string `json:"source"`
    //      Type        bool                `json:"type"`
    Time time.Now               `json:"time"`
    Data map[string]interface{} `json:"data"` /// this part supposed to come from the file
}

func main() {

    if len(os.Args) < 1 { //checking for provided argument if the first arg satisfy then use read file
        fmt.Println("Usage : "   os.Args[0]   " file name")
        help()
        os.Exit(1)
    }

    file, err := ioutil.ReadFile(os.Args[1])
    if err != nil {
        fmt.Println("Cannot read the file or file does not exists")
        os.Exit(1)
    }
    res := map[string]interface{}{}
    err = json.Unmarshal(file, &res)
    if err != nil {
        panic(err)
    }
    //fmt.Println(string(out))

    e := Event{
        Specversion: "1.0",
        //id: uuid.New(),
        Source: "CSS",
        //type: true,
        Time: time.Now(),
        Data: res,
    }
    fmt.Println(string(out))
    fmt.Println(string(e))
    //fmt.Println(string(id))

}

Defining your Event struct data type as map sting interface helps. Hope this works.