ericyzhu / goja_go

goja_go

some js extensions of github.com/powerpuffpenguin/goja

goja_go imports most of the golang standard library into goja for js call

You can compile main.go to use goja_go as an independent js engine, or you can refer to the writing in main.go to embed goja_go into your own program

embed goja_go

Please refer to main.go for the complete code

1. Create goja.Runtime and set the Option provided by goja_go

   runtime := goja.New(
      goja.WithScheduler(loop.NewScheduler(32)),
      goja.WithFieldGetter(builtin.FieldGetter),
      goja.WithCallerFactory(builtin.NewCallerFactory()),
   )
   

2. Enable require

   // enable require
   registry := require.NewRegistry(
      require.WithGlobalFolders(`node_modules`),
      require.WithLoader(core.Loader),
   )
   registry.Enable(runtime)
   

3. Enable stdgo and register the golang standard library

   stdgo.Enable(runtime)
   stdgo.RegisterNativeModuleToRegistry(registry)
   

   The RegisterNativeModuleToRegistry function will inject all the implemented libraries into the js environment. You can also register the libraries under the stdgo folder on-demand instead of calling RegisterNativeModuleToRegistry

4. Call Run and Serve run scripts and event loops

   runtime.RunScriptAndServe(filename, string(source))
   

stdgo

The following js environment supports the go standard library:

• archive
  • tar
  • zip
• bufio
• bytes
• compress
  • bzip2
  • flate
  • gzip
  • lzw
  • zlib
• container
• context
• crypto
  • aes
  • cipher
  • des
  • dsa
  • ecdsa
  • ed25519
  • elliptic
  • hmac
  • md5
  • rand
  • rc4
  • rsa
  • sha1
  • sha256
  • sha512
  • subtle
  • tls
  • x509
    • pkix
• database
  • sql
    • driver
• debug
• embed
• encoding
  • ascii85
  • asn1
  • base32
  • base64
  • binary
  • csv
  • gob
  • hex
  • json
  • pem
  • xml
• errors
• expvar
• flag
• fmt
• go
• hash
  • adler32
  • crc32
  • crc64
  • fnv
  • maphash
• html
  • template
• image
  • color
    • palette
  • draw
  • gif
  • jpeg
  • png
• index
  • suffixarray
• io
  • fs
  • ioutil
• log
• math
  • big
  • bits
  • cmplx
  • rand
• mime
  • multipart
  • quotedprintable
• net
  • http
  • mail
  • smtp
  • textproto
  • url
• os
  • exec
  • signal
• path
  • filepath
• plugin
• reflect
• regexp
• runtime
• sort
• strconv
• strings
• sync
• syscall
• testing
• text
  • template
    • parse
• time
• unicode
• unsafe

1. The typescript declaration of the js function is located in scripts/types/stdgo
2. The module name in js is the prefix of stdgo + ${go std module name}

Install Typescript Declaration

yarn add stdgo

or

npm i stdgo

Example

Example of calling the go standard library in js

more example

// This is an example of an echo server
import * as builtin from "stdgo/builtin";
import * as net from "stdgo/net";
import * as io from "stdgo/io";
import * as time from "stdgo/time";
import * as fmt from "stdgo/fmt";

async function main() {
    const addr = "127.0.0.1:10000"

    const l = await builtin.async(net.Listen, 'tcp', addr)
    console.log("listen on->", addr)
    let tempDelay = 0
    while (true) {
        try {
            const c = await builtin.async(l.Accept)

            const remote = c.RemoteAddr().String()
            console.log("one in:", remote)
            builtin.async(io.Copy, c, c).catch((e) => {
                console.log("io.Copy err->", e)
            }).finally(() => {
                console.log("one out:", remote)
                c.Close()
            })
        } catch (e) {
            if (e instanceof GoError && net.isError(e.value)) {
                const ne = e.value
                if (ne.Temporary()) {
                    if (tempDelay == 0) {
                        tempDelay = 5
                    } else {
                        tempDelay *= 2
                        if (tempDelay > 1000) {
                            tempDelay = 1000
                        }
                    }

                    const duration = time.Duration(builtin.Int64(time.Millisecond).Mul(tempDelay))
                    fmt.Printf("Accept error: %v; retrying in %v\n", ne, tempDelay)
                    await builtin.async(time.Sleep, duration)
                    continue
                }
            }
            console.log("accept err->", e)
            return
        }
    }
}
main().catch((e) => {
    console.log("listen err->", e)
})

// This example connects to the echo server and disconnects after sending and receiving 5 pieces of data
import * as builtin from "stdgo/builtin";
import * as net from "stdgo/net";
import * as io from "stdgo/io";
import * as fmt from "stdgo/fmt";
import * as bytes from "stdgo/bytes";
import * as time from "stdgo/time";

async function main(c: net.Conn) {
    const data = builtin.Uint8Slice(1024)
    for (let i = 0; i < 5; i++) {
        if (i != 0) {
            await builtin.async(time.Sleep, time.Second)
        }

        const msg = fmt.Sprintf("message %d", i)
        const b = bytes.Bytes(msg)
        await builtin.async(c.Write, b)
        console.log("send->", msg)

        const read = data.Slice2(0, msg.length)
        await builtin.async(io.ReadAtLeast, c, read, read.Len())
        console.log("recv->", bytes.String(read))
    }
}
const addr = "127.0.0.1:10000"
builtin.async(net.Dial, 'tcp', addr).then((c) => {
    main(c).catch((e) => {
        console.log("msg err->", e)
    }).finally(() => {
        c.Close()
    })
}).catch((e) => {
    console.log("dial err->", e)
})