# [Gostd](https://github.com/wandercn/gostd)

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Gostd is the golang standard library implementation in rust-lang.

Gostd是rust-lang中的golang标准库实现。

rust 语法比go复杂，但是go代码简单好理解，想通过这个项目把go的标准库通过rust实现。以后有什么go的项目可以通过它方便翻译代码到rust，比如把 import "bytes" 改成 use gostd::bytes 就可以实现转换。

本项目纯粹个人兴趣，大概率会失败，但是梦想还是要有的万一它实现了。

go to rust,to be rust or to be failed.

# 已知难点
- go底层特性可能无法用rust实现，比如跟运行时相关的反射reflect，如果有依赖此库需要通过rust中的方式处理。
- 基础数据类型的转换，比如string是否采用自定义类型比如GoString来实现还是用string，float64(go) -> f64(rust)等等。
- 还有指针类型，幸好go的指针操作相比rust要少。
- go中的接口如何用rust的trait的实现？个人感觉还相对比较容易
- go中的不定参数在rust中只能用宏实现，这个比较麻烦，个人目前还不知道宏能不能像方法一样绑定到sturct上。

## 需要用rust实现的go标准库列表，go.1.17.1代码做参考。

go 这个包不会实现，因为我们转换成rust基本用不上这个包。
```
├── archive
├── bufio
├── builtin
├── bytes
├── cmd
├── compress
├── container
├── context
├── crypto
├── database
├── debug
├── embed
├── encoding
├── errors
├── expvar
├── flag
├── fmt
├── go
├── hash
├── html
├── image
├── index
├── internal
├── io
├── log
├── math
├── mime
├── net
├── os
├── path
├── plugin
├── reflect
├── regexp
├── runtime
├── sort
├── strconv
├── strings
├── sync
├── syscall
├── testdata
├── testing
├── text
├── time
├── unicode
├── unsafe
└── vendor
```

## 对应预期实现后的gostd的Model列表
```
use gostd::archive
use gostd::bufio
use gostd::builtin
use gostd::bytes
use gostd::cmd
use gostd::compress
use gostd::container
use gostd::context
use gostd::crypto
use gostd::database
use gostd::debug
use gostd::embed
use gostd::encoding
use gostd::errors
use gostd::expvar
use gostd::flag
use gostd::fmt
use gostd::go
use gostd::hash
use gostd::html
use gostd::image
use gostd::index
use gostd::internal
use gostd::io
use gostd::log
use gostd::math
use gostd::mime
use gostd::net
use gostd::os
use gostd::path
use gostd::plugin
use gostd::reflect
use gostd::regexp
use gostd::runtime
use gostd::sort
use gostd::strconv
use gostd::strings
use gostd::sync
use gostd::syscall
use gostd::testdata
use gostd::testing
use gostd::text
use gostd::time
use gostd::unicode
use gostd::unsafe
use gostd::vendor
```

# 大致方向

- 分析go标准库的依赖情况，从最底层的库开始实现。
- go源码中的单元测试也会一并用rust实现，这样可以保证代码的健壮性。

# todo

- [x] Go基础类型在rust实现，在gostd::builtin 中,比如 int64 = i64, int32 = i32
- [x] 强制转换宏,例如 2 as i64 等价 int64!(2) 跟Go的int64(2)就多个！
- [x] time库在rust实现 gostd::time
- [x] time库支持macOSX 和linux平台，通过libc库调用C函数实现 time::Now()
- [x] time，支持各种格式显示时间。
- [x] docs.rs文档增加例子程序"RUN"按钮,但是要复制代码本地运行,在rust play运行不了(因为下载量没到前100)。
- [x] time支持local时区信息自动从系统读取，可以用time::Now()获取本地时间。
- [x] strings模块，字符串处理函数已完成。除了Reader相关方法还没全实现。(version >=0.2.3)
- [x] strings模块, 完成剩余的方法实现。(version >=0.2.4)
- [x] io模块,完成部分接口例如Reader，Writer等。(version >=0.2.4)
- [x] http模块的client客户端功能，支持http和https。(version >=0.2.6)
- [x] 完成bytes模块。(version >=0.2.8)
- [x] 完成mime::multipart模块。(version >=0.3.1)
- [x] 修复windos10平台编译失败的bug。(version>=0.3.18)

# 独立发布包
 
独立发布gostd_time，代码等价于 use gostd::time 。 

独立发布gostd_builtin, 代码等价于 use gostd::builtin 。 

# 使用例子

## multipart模块

### form-data Body

```rust
use gostd::bytes;
use gostd::mime::multipart::Writer;
use gostd::net::http::{Client, Method, Request};
fn main() -> Result<(), std::io::Error> {
    let mut body = bytes::Buffer::new();
    let mut w = Writer::new(&mut body);
    w.WriteField("requestId", "12121231231")?;
    w.WriteField("testTime", "2022-01-22 18:00:00")?;
    w.WriteField("checkTime", "2022-01-22 22:00:00")?;
    w.WriteField("auditTime", "2022-01-22 23:00:00")?;
    w.WriteField("tubeCode", "QCGD99SDF")?;
    w.WriteField("testRatio", "1")?;
    w.WriteField("name", "刘xxx")?;
    w.WriteField("sex", "1")?;
    w.WriteField("birthdate", "20003-07-02")?;
    w.WriteField("address", "北京市丰台区")?;
    w.WriteField("phoneNumber", "1881xxxx")?;
    w.WriteField("cardType", "身份证")?;
    w.WriteField("cardNumber", "xxxx")?;
    w.WriteField("testResult", "0")?;
    w.WriteField("testUserName", "xxx")?;
    w.WriteField("checkUserName", "xxx")?;
    w.Close()?;
    let contentType = w.FormDataContentType();
    let url = "http://www.baidu.com";
    let mut req = Request::New(Method::Post, url, Some(body.Bytes()))?;
    req.Header.Set("Content-Type", contentType.as_str());
    let mut client = Client::New();
    let response = client.Do(&mut req)?;

    println!(
        "{}",
        String::from_utf8(response.Body.expect("return body error")).unwrap()
    );

    Ok(())
}
```
## http模块

### client客户端

1. POST

```rust

use gostd::net::http;
fn main() -> Result<(), std::io::Error> {
    let url = "https://petstore.swagger.io/v2/pet";
    let postbody = r#"{"id":0,"category":{"id":0,"name":"string"},"name":"doggie","photoUrls":["string"],"tags":[{"id":0,"name":"string"}],"status":"available"}"#
   .as_bytes()
   .to_vec();
    let response = http::Post(url, "application/json", Some(postbody))?;

    println!(
        "{}",
        String::from_utf8(response.Body.expect("return body error")).unwrap()
    );

    Ok(())
}

```
或者 

```rust
use gostd::net::http::{Client, Method, Request};

fn main() -> Result<(), std::io::Error> {

    let url = "https://petstore.swagger.io/v2/pet";

    let postbody = r#"{
      "id": 0,
      "category": {
        "id": 0,
        "name": "string"
      },
      "name": "doggie",
      "photoUrls": [
        "string"
      ],
      "tags": [
        {
          "id": 0,
          "name": "string"
        }
      ],
      "status": "available"
    }"#
    .as_bytes()
    .to_vec();

    let mut req = Request::New(Method::Post, url, Some(postbody))?;

    req.Header.Set("accept", "application/json");
    req.Header.Set("Content-Type", "application/json");
    let mut client = Client::New();
    let response = client.Do(&mut req)?;

    println!(
        "{}",
        String::from_utf8(response.Body.expect("return body error")).unwrap()
    );

    Ok(())
}

// output
// {"id":92233723685477587,"category":{"id":,"name":"string"},"name":"doggie","photoUrls":["string"],"tags":[{"id":,"name":"string"}],"status":"available"}

```

2. GET

```rust
use gostd::net::http;

fn main() -> Result<(), std::io::Error> {
    let url = "https://petstore.swagger.io/v2/pet/findByStatus?status=available";
    let response = http::Get(url)?;

    println!(
        "{}",
        String::from_utf8(response.Body.expect("return body error")).unwrap()
    );

    Ok(())
}

``` 
或者 

```rust
use gostd::net::http::{Client, Method, Request};

fn main() -> Result<(), std::io::Error> {

    let url = "https://petstore.swagger.io/v2/pet/findByStatus?status=available";
    let mut req = Request::New(Method::Get, url, None)?;
    req.Header.Set("Content-Type", "application/json");

    let mut client = Client::New();

    let response = client.Do(&mut req)?;
    println!(
        "{}",
        String::from_utf8(response.Body.expect("return body error")).unwrap()
    );

    Ok(())
}

```

## strings模块

1. 字符串替换 strings::ReplaceAll()

```rust
use gostd::strings;

fn main() {

    assert_eq!(
        "moo moo moo",
        strings::ReplaceAll("oink oink oink", "oink", "moo")
    );
}
```

2. 字符串分割 strings::Split()

```rust
use gostd::strings;

fn main() {

    assert_eq!(vec!["a", "b", "c"], strings::Split("a,b,c", ","));
    assert_eq!(
        vec!["", "man ", "plan ", "canal panama"],
        strings::Split("a man a plan a canal panama", "a ")
    );
    assert_eq!(
        vec!["", " ", "x", "y", "z", " ", ""],
        strings::Split(" xyz ", "")
    );
    assert_eq!(vec![""], strings::Split("", "Bernardo O'Higgins"));
}

```

3. 字符串位置查找 strings::Index

```rust
use gostd::strings;

fn main() {

    assert_eq!(4, strings::Index("chicken", "ken"));
    assert_eq!(-1, strings::Index("chicken", "dmr"));
}

```

4. 将多个字符串连接成一个新字符串 strings::Join

```rust 
use gostd::strings;

fn main() {

    let s = vec!["foo", "bar", "baz"];
    assert_eq!("foo, bar, baz", strings::Join(s, ", "));
}

```

5. 字符串转换成大写 strings::ToUpper

```rust
use gostd::strings;

fn main() {

    assert_eq!("GOPHER", strings::ToUpper("Gopher"));
}
```

6. 字符串转换成小写 strings::ToLower
```rust
use gostd::strings;

fn main() {

    assert_eq!("gopher", strings::ToLower("Gopher"));
}

```