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package msgpack_test
import (
"bytes"
"fmt"
"github.com/vmihailenco/msgpack/v5"
)
func ExampleMarshal() {
type Item struct {
Foo string
}
b, err := msgpack.Marshal(&Item{Foo: "bar"})
if err != nil {
panic(err)
}
var item Item
err = msgpack.Unmarshal(b, &item)
if err != nil {
panic(err)
}
fmt.Println(item.Foo)
// Output: bar
}
func ExampleMarshal_mapStringInterface() {
in := map[string]interface{}{"foo": 1, "hello": "world"}
b, err := msgpack.Marshal(in)
if err != nil {
panic(err)
}
var out map[string]interface{}
err = msgpack.Unmarshal(b, &out)
if err != nil {
panic(err)
}
fmt.Println("foo =", out["foo"])
fmt.Println("hello =", out["hello"])
// Output:
// foo = 1
// hello = world
}
func ExampleDecoder_SetMapDecoder() {
buf := new(bytes.Buffer)
enc := msgpack.NewEncoder(buf)
in := map[string]string{"hello": "world"}
err := enc.Encode(in)
if err != nil {
panic(err)
}
dec := msgpack.NewDecoder(buf)
// Causes decoder to produce map[string]string instead of map[string]interface{}.
dec.SetMapDecoder(func(d *msgpack.Decoder) (interface{}, error) {
n, err := d.DecodeMapLen()
if err != nil {
return nil, err
}
m := make(map[string]string, n)
for i := 0; i < n; i++ {
mk, err := d.DecodeString()
if err != nil {
return nil, err
}
mv, err := d.DecodeString()
if err != nil {
return nil, err
}
m[mk] = mv
}
return m, nil
})
out, err := dec.DecodeInterface()
if err != nil {
panic(err)
}
fmt.Printf("%#v", out)
// Output: map[string]string{"hello":"world"}
}
func ExampleDecoder_Query() {
b, err := msgpack.Marshal([]map[string]interface{}{
{"id": 1, "attrs": map[string]interface{}{"phone": 12345}},
{"id": 2, "attrs": map[string]interface{}{"phone": 54321}},
})
if err != nil {
panic(err)
}
dec := msgpack.NewDecoder(bytes.NewBuffer(b))
values, err := dec.Query("*.attrs.phone")
if err != nil {
panic(err)
}
fmt.Println("phones are", values)
dec.Reset(bytes.NewBuffer(b))
values, err = dec.Query("1.attrs.phone")
if err != nil {
panic(err)
}
fmt.Println("2nd phone is", values[0])
// Output: phones are [12345 54321]
// 2nd phone is 54321
}
func ExampleEncoder_UseArrayEncodedStructs() {
type Item struct {
Foo string
Bar string
}
var buf bytes.Buffer
enc := msgpack.NewEncoder(&buf)
enc.UseArrayEncodedStructs(true)
err := enc.Encode(&Item{Foo: "foo", Bar: "bar"})
if err != nil {
panic(err)
}
dec := msgpack.NewDecoder(&buf)
v, err := dec.DecodeInterface()
if err != nil {
panic(err)
}
fmt.Println(v)
// Output: [foo bar]
}
func ExampleMarshal_asArray() {
type Item struct {
_msgpack struct{} `msgpack:",as_array"`
Foo string
Bar string
}
var buf bytes.Buffer
enc := msgpack.NewEncoder(&buf)
err := enc.Encode(&Item{Foo: "foo", Bar: "bar"})
if err != nil {
panic(err)
}
dec := msgpack.NewDecoder(&buf)
v, err := dec.DecodeInterface()
if err != nil {
panic(err)
}
fmt.Println(v)
// Output: [foo bar]
}
func ExampleMarshal_omitEmpty() {
type Item struct {
Foo string
Bar string
}
item := &Item{
Foo: "hello",
}
b, err := msgpack.Marshal(item)
if err != nil {
panic(err)
}
fmt.Printf("item: %q\n", b)
type ItemOmitEmpty struct {
_msgpack struct{} `msgpack:",omitempty"`
Foo string
Bar string
}
itemOmitEmpty := &ItemOmitEmpty{
Foo: "hello",
}
b, err = msgpack.Marshal(itemOmitEmpty)
if err != nil {
panic(err)
}
fmt.Printf("item2: %q\n", b)
// Output: item: "\x82\xa3Foo\xa5hello\xa3Bar\xa0"
// item2: "\x81\xa3Foo\xa5hello"
}
func ExampleMarshal_escapedNames() {
og := map[string]interface{}{
"something:special": uint(123),
"hello, world": "hello!",
}
raw, err := msgpack.Marshal(og)
if err != nil {
panic(err)
}
type Item struct {
SomethingSpecial uint `msgpack:"'something:special'"`
HelloWorld string `msgpack:"'hello, world'"`
}
var item Item
if err := msgpack.Unmarshal(raw, &item); err != nil {
panic(err)
}
fmt.Printf("%#v\n", item)
//output: msgpack_test.Item{SomethingSpecial:0x7b, HelloWorld:"hello!"}
}
|
