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Go: Copying an interface to a new interface to unmarshal types
Aug 2, 2018 - 1 minutesThis is useful if you’re building a generic library/package and want to let people pass in types and convert to them/return them.
1package main
2
3import (
4 "encoding/json"
5 "fmt"
6 "reflect"
7)
8
9type Monkey struct {
10 Bananas int
11}
12
13func main() {
14 deliveryChan := make(chan interface{}, 1)
15 someWorker(&Monkey{}, deliveryChan)
16 monkey := <- deliveryChan
17 fmt.Printf("Monkey: %#v\n", monkey.(*Monkey))
18}
19
20func someWorker(inputType interface{}, deliveryChan chan interface{}) {
21 local := reflect.New(reflect.TypeOf(inputType).Elem()).Interface()
22 json.Unmarshal([]byte(`{"Bananas":20}`), local)
23 deliveryChan <- local
24}
Line 22 should be using whatever byte array your popping off a MQ or stream or something else to send back.
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