I am trying to build aggregation services, to all third party APIs that's I used, this aggregation services taking json values coming from my main system and it will put this value to key equivalent to third party api key then, aggregation services it will send request to third party api with new json format.
example-1:
package main
import (
"encoding/json"
"fmt"
"log"
"github.com/tidwall/gjson"
)
func main() {
// mapping JSON
mapB := []byte(`
{
"date": "createdAt",
"clientName": "data.user.name"
}
`)
// from my main system
dataB := []byte(`
{
"createdAt": "2017-05-17T08:52:36.024Z",
"data": {
"user": {
"name": "xxx"
}
}
}
`)
mapJSON := make(map[string]interface{})
dataJSON := make(map[string]interface{})
newJSON := make(map[string]interface{})
err := json.Unmarshal(mapB, &mapJSON)
if err != nil {
log.Panic(err)
}
err = json.Unmarshal(dataB, &dataJSON)
if err != nil {
log.Panic(err)
}
for i := range mapJSON {
r := gjson.GetBytes(dataB, mapJSON[i].(string))
newJSON[i] = r.Value()
}
newB, err := json.MarshalIndent(newJSON, "", " ")
if err != nil {
log.Println(err)
}
fmt.Println(string(newB))
}
output:
{
"clientName": "xxx",
"date": "2017-05-17T08:52:36.024Z"
}
I use gjson package to get values form my main system request in simple way from a json document.
example-2:
import (
"encoding/json"
"fmt"
"log"
"github.com/tidwall/gjson"
)
func main() {
// mapping JSON
mapB := []byte(`
{
"date": "createdAt",
"clientName": "data.user.name",
"server":{
"google":{
"date" :"createdAt"
}
}
}
`)
// from my main system
dataB := []byte(`
{
"createdAt": "2017-05-17T08:52:36.024Z",
"data": {
"user": {
"name": "xxx"
}
}
}
`)
mapJSON := make(map[string]interface{})
dataJSON := make(map[string]interface{})
newJSON := make(map[string]interface{})
err := json.Unmarshal(mapB, &mapJSON)
if err != nil {
log.Panic(err)
}
err = json.Unmarshal(dataB, &dataJSON)
if err != nil {
log.Panic(err)
}
for i := range mapJSON {
r := gjson.GetBytes(dataB, mapJSON[i].(string))
newJSON[i] = r.Value()
}
newB, err := json.MarshalIndent(newJSON, "", " ")
if err != nil {
log.Println(err)
}
fmt.Println(string(newB))
}
output:
panic: interface conversion: interface {} is map[string]interface {}, not string
I can handle this error by using https://golang.org/ref/spec#Type_assertions, but what if this json object have array and inside this array have json object ....
my problem is I have different apis, every api have own json schema, and my way for mapping json only work if third party api have json key value only, without nested json or array inside this array json object.
is there a way to mapping complex json schema, or golang package to help me to do that?