[Golang] unmarshal to struct

[Nyx2022]

Is your feature request related to a problem? Please describe.

when i marshal a map in java,and send it by internet to a golang program,i only can unmarshal it to a interface{},but i want and need unmarshal it to a struct in golang so that i can get or set attribute easily,but no i unmarshal it to a struct ,i will get a err like:"reflect.Value.IsNil"

Describe the solution you'd like

support unmarshal to struct in golang

Additional context

[chaokunyang]

Hi @Nyx2022, thanks for reporting this issue. Could you provide some test code here?
Fury supports deserialized to struct directly:

a := &A{}
a.A1 = a
bytes, err := fury.Marshal(a)
require.Nil(t, err)
var a1 *A
err = fury.Unmarshal(bytes, &a1)
require.Nil(t, err)
require.Same(t, a1, a1.A1)

[Nyx2022]

Hi @Nyx2022, thanks for reporting this issue. Could you provide some test code here?嗨，感谢您报告此问题。你能在这里提供一些测试代码吗？ Fury supports deserialized to struct directly:Fury 支持直接反序列化为 struct：

a := &A{}
a.A1 = a
bytes, err := fury.Marshal(a)
require.Nil(t, err)
var a1 *A
err = fury.Unmarshal(bytes, &a1)
require.Nil(t, err)
require.Same(t, a1, a1.A1)

i marshal some data in java and save bytes into a file,

    public static Map<String, String> createObject() {

        Map<String, String> m = new HashMap<String, String>();

        m.put("a", "4");
        m.put("b", "3");
        m.put("c", "2");
        m.put("d", "1");

        return m;
    }

    public static void main(String[] args) {

        System.out.println("Hello world!");


        Fury fury = Fury.builder().withLanguage(Language.XLANG)
                .withRefTracking(true).build();


        byte[] bytes = fury.serialize(createObject());

        System.out.println(bytes.length);


        try {
            Files.write(Paths.get("d:/fury.txt"), bytes);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        System.out.println(new String(bytes));
        System.out.println(fury.deserialize(bytes));
    }

then read from file and unmarhal to a struct in golang:

the type T is

type T struct {
	A string `json:"a"`
	B string `json:"b"`
	C string `json:"c"`
	D string `json:"d"`
}

        fury := furygo.NewFury(true)
	

	file, err := os.ReadFile("d:/fury.txt")
	if err == nil && len(file) > 0 {
		var Caches21 map[interface{}]*T
		start1 := time.Now()
		err6 := fury.Unmarshal(file, &Caches21)
		if err6 == nil {
			fmt.Println("fury 反序列化耗时：" + time.Now().Sub(start1).String())
			fmt.Println(Caches21)
		}

	}

but the error occured :

so how can i use fury in multi langs

[longbai]

val := event.Query{
Nat: 1,
Ip: "193.1.2.3",
Url: "http://baidu.com",
Status: 0,
}
fury_ := fury.NewFury(true)
if err := fury_.RegisterTagType("example.SomeClass", event.Query{}); err != nil {
panic(err)
}

bt, err := fury_.Marshal(&val)
if err != nil {
    b.Log(err)
    return
}

   _ = fury_.Unmarshal(bt, &newval)
   }
   报错 
   panic: reflect.Set: value of type *event.Query is not assignable to type event.Query

而且Readme里的文档 是用interface{}, 不是结构体。
测试无论是序列化反序列化 比Go标准库的json 的时间都不如

[chaokunyang]

@longbai 可以再重新试一下，新版本的 fory go 性能比 Protobuf 快2倍，比 msgpack 快11 倍

Benchmark results on Apple M1 Pro:

Data Type	Operation	Fory (ops/s)	Protobuf (ops/s)	Msgpack (ops/s)	Fory vs PB	Fory vs MP
Struct	Serialize	23.52M	10.83M	5.19M	2.17x	4.54x
Struct	Deserialize	15.01M	11.97M	3.28M	1.25x	4.58x
Sample	Serialize	8.26M	3.01M	750K	2.75x	11.01x
Sample	Deserialize	4.52M	2.51M	387K	1.80x	11.70x
Mediacontent	Serialize	4.93M	2.30M	1.17M	2.14x	4.21x
Mediacontent	Deserialize	2.74M	1.87M	751K	1.46x	3.65x

你也可以直接跑一下 benchmark 代码： https://github.com/apache/fory/tree/main/benchmarks/go_benchmark

[chaokunyang]

@longbai 另外你说的 interface的问题在当前的版本并不存在了：

https://fory.apache.org/docs/next/guide/go/basic_serialization

// Serialize value
value := MyType {...}
data, err := f.Serialize(&value)
if err != nil {
    // Handle error
}

// Deserialize into target
var result MyType
err = f.Deserialize(data, &result)
if err != nil {
    // Handle error
}

[chaokunyang]

Hi @Nyx2022, thanks for reporting this issue. Could you provide some test code here?嗨，感谢您报告此问题。你能在这里提供一些测试代码吗？ Fury supports deserialized to struct directly:Fury 支持直接反序列化为 struct：
}
but the error occured :

so how can i use fury in multi langs

@Nyx2022 You can take https://fory.apache.org/docs/next/guide/go/cross_language and https://fory.apache.org/docs/next/guide/xlang/getting_started as references