Simple go-wire interface example

gistfile1.go

package main

import (
  "fmt"
  "bytes"
	"github.com/tendermint/go-wire"
)

type Foo interface {
  Bar()
}

type A struct {
  A int
}

func (_ *A) Bar() {
  fmt.Println("A-Bar")
}

type B struct {
  B string
}

func (_ *B) Bar() {
  fmt.Println("B-Bar")
}

func CallBar(f Foo) {
  foo := f.(Foo)
  foo.Bar()
}

func EncodeFoo(f Foo) (*bytes.Buffer, int, error){
  foo := f.(Foo)
  buf, n, err := new(bytes.Buffer), int(0), error(nil)
  wire.WriteBinary(foo, buf, &n, &err)
  return buf, n, err
}

var _ = wire.RegisterInterface(struct{ Foo }{}, wire.ConcreteType{A{}, 0x01}, wire.ConcreteType{B{}, 0x02})

func main() {
  a := &A{123}
  b := &B{"123"}
  // c := 5
  CallBar(a)
  CallBar(b)
  // CallBar(c)
  ba, na, erra := EncodeFoo(a)
  fmt.Printf("%v, %v, %v\n", ba, na, erra)
  bb, nb, errb := EncodeFoo(b)
  fmt.Printf("%v, %v, %v\n", bb, nb, errb)
  // EncodeFoo(c)
}