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package main
import (
"fmt"
"io/ioutil"
"os"
"reflect"
"github.com/linkedin/goavro/v2"
)
var (
codec *goavro.Codec
)
func init() {
schema, err := ioutil.ReadFile("schema.avsc")
if err != nil {
panic(err)
}
//Create Schema Once
codec, err = goavro.NewCodec(string(schema))
if err != nil {
panic(err)
}
}
func main() {
//Sample Data
user := &User{
FirstName: "John",
LastName: "Snow",
Address: &Address{
Address1: "1106 Pennsylvania Avenue",
City: "Wilmington",
State: "DE",
Zip: 19806,
},
}
fmt.Printf("user in=%+v\n", user)
///Convert Binary From Native
binary, err := codec.BinaryFromNative(nil, user.ToStringMap())
if err != nil {
panic(err)
}
///Convert Native from Binary
native, _, err := codec.NativeFromBinary(binary)
if err != nil {
panic(err)
}
//Convert it back tp Native
userOut := StringMapToUser(native.(map[string]interface{}))
fmt.Printf("user out=%+v\n", userOut)
if ok := reflect.DeepEqual(user, userOut); !ok {
fmt.Fprintf(os.Stderr, "struct Compare Failed ok=%t\n", ok)
os.Exit(1)
}
}
// User holds information about a user.
type User struct {
FirstName string
LastName string
Errors []string
Address *Address
}
// Address holds information about an address.
type Address struct {
Address1 string
Address2 string
City string
State string
Zip int
}
// ToStringMap returns a map representation of the User.
func (u *User) ToStringMap() map[string]interface{} {
datumIn := map[string]interface{}{
"FirstName": string(u.FirstName),
"LastName": string(u.LastName),
}
if len(u.Errors) > 0 {
datumIn["Errors"] = goavro.Union("array", u.Errors)
} else {
datumIn["Errors"] = goavro.Union("null", nil)
}
if u.Address != nil {
addDatum := map[string]interface{}{
"Address1": string(u.Address.Address1),
"City": string(u.Address.City),
"State": string(u.Address.State),
"Zip": int(u.Address.Zip),
}
if u.Address.Address2 != "" {
addDatum["Address2"] = goavro.Union("string", u.Address.Address2)
} else {
addDatum["Address2"] = goavro.Union("null", nil)
}
//important need namespace and record name
datumIn["Address"] = goavro.Union("my.namespace.com.address", addDatum)
} else {
datumIn["Address"] = goavro.Union("null", nil)
}
return datumIn
}
// StringMapToUser returns a User from a map representation of the User.
func StringMapToUser(data map[string]interface{}) *User {
ind := &User{}
for k, v := range data {
switch k {
case "FirstName":
if value, ok := v.(string); ok {
ind.FirstName = value
}
case "LastName":
if value, ok := v.(string); ok {
ind.LastName = value
}
case "Errors":
if value, ok := v.(map[string]interface{}); ok {
for _, item := range value["array"].([]interface{}) {
ind.Errors = append(ind.Errors, item.(string))
}
}
case "Address":
if vmap, ok := v.(map[string]interface{}); ok {
//important need namespace and record name
if cookieSMap, ok := vmap["my.namespace.com.address"].(map[string]interface{}); ok {
add := &Address{}
for k, v := range cookieSMap {
switch k {
case "Address1":
if value, ok := v.(string); ok {
add.Address1 = value
}
case "Address2":
if value, ok := v.(string); ok {
add.Address2 = value
}
case "City":
if value, ok := v.(string); ok {
add.City = value
}
case "Zip":
if value, ok := v.(int); ok {
add.Zip = value
}
}
}
ind.Address = add
}
}
}
}
return ind
}
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