mirror of
https://github.com/rclone/rclone.git
synced 2024-11-22 12:36:38 +08:00
js: add experimental interface for integrating rclone into browsers
This works by compiling rclone to wasm and exporting the RC api to javascript.
This commit is contained in:
Nick Craig-Wood
parent
3a14b1d5a9
commit
aab9aa8a2e
1
fs/rc/js/.gitignore
vendored
Normal file
1
fs/rc/js/.gitignore
vendored
Normal file
|
|
@ -0,0 +1 @@
|
|||
*.wasm
|
||||
5
fs/rc/js/Makefile
Normal file
5
fs/rc/js/Makefile
Normal file
|
|
@ -0,0 +1,5 @@
|
|||
build:
|
||||
GOARCH=wasm GOOS=js go build -o rclone.wasm
|
||||
|
||||
serve: build
|
||||
go run serve.go
|
||||
25
fs/rc/js/README.md
Normal file
25
fs/rc/js/README.md
Normal file
|
|
@ -0,0 +1,25 @@
|
|||
# Rclone as WASM
|
||||
|
||||
This directory contains files to use the rclone rc as a library in the browser.
|
||||
|
||||
This works by compiling rclone to WASM and loading that in via javascript.
|
||||
|
||||
This contains the following files
|
||||
|
||||
- `index.html` - test web page to load the module
|
||||
- `loader.js` - java script to load the module - see here for usage
|
||||
- `main.go` - main go code exporting the rclone rc
|
||||
- `Makefile` - test makefile
|
||||
- `README.md` - this readme
|
||||
- `serve.go` - test program to serve the web page
|
||||
- `wasm_exec.js` - interface code from the go source - don't edit
|
||||
|
||||
## Compiling
|
||||
|
||||
This can be compiled by using `make` or alternatively `GOARCH=wasm GOOS=js go build -o rclone.wasm`
|
||||
|
||||
## Running
|
||||
|
||||
Run the test server with `make serve` and examine the page at
|
||||
http://localhost:3000/ - look at the javascript console and look at
|
||||
the end of `loader.js` for how that works.
|
||||
11
fs/rc/js/index.html
Normal file
11
fs/rc/js/index.html
Normal file
|
|
@ -0,0 +1,11 @@
|
|||
<!doctype html>
|
||||
<html>
|
||||
<head>
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
||||
<title>Rclone</title>
|
||||
</head>
|
||||
<body>
|
||||
<script src="loader.js"></script>
|
||||
<p>Welcome to rclone - check the console</p>
|
||||
</body>
|
||||
</html>
|
||||
36
fs/rc/js/loader.js
Normal file
36
fs/rc/js/loader.js
Normal file
|
|
@ -0,0 +1,36 @@
|
|||
var rc;
|
||||
var rcValidResolve
|
||||
var rcValid = new Promise(resolve => {
|
||||
rcValidResolve = resolve
|
||||
});
|
||||
|
||||
var script = document.createElement('script');
|
||||
script.src = "wasm_exec.js";
|
||||
script.onload = function () {
|
||||
if (!WebAssembly.instantiateStreaming) { // polyfill
|
||||
WebAssembly.instantiateStreaming = async (resp, importObject) => {
|
||||
const source = await (await resp).arrayBuffer();
|
||||
return await WebAssembly.instantiate(source, importObject);
|
||||
};
|
||||
}
|
||||
const go = new Go();
|
||||
WebAssembly.instantiateStreaming(fetch("rclone.wasm"), go.importObject).then((result) => {
|
||||
go.run(result.instance);
|
||||
});
|
||||
|
||||
};
|
||||
document.head.appendChild(script);
|
||||
|
||||
rcValid.then(() => {
|
||||
// Some examples of using the rc call
|
||||
//
|
||||
// The rc call takes two parameters, method and input object and
|
||||
// returns an output object.
|
||||
//
|
||||
// If the output object has an "error" and a "status" then it is an
|
||||
// error (it would be nice to signal this out of band).
|
||||
console.log("core/version", rc("core/version", null))
|
||||
console.log("core/version", rc("rc/noop", {"string":"one",number:2}))
|
||||
console.log("core/version", rc("operations/mkdir", {"fs":":memory:","remote":"bucket"}))
|
||||
console.log("core/version", rc("operations/list", {"fs":":memory:","remote":"bucket"}))
|
||||
})
|
||||
145
fs/rc/js/main.go
Normal file
145
fs/rc/js/main.go
Normal file
|
|
@ -0,0 +1,145 @@
|
|||
// Rclone as a wasm library
|
||||
//
|
||||
// This library exports the core rc functionality
|
||||
|
||||
// +build js
|
||||
|
||||
package main
|
||||
|
||||
import (
|
||||
"context"
|
||||
"encoding/json"
|
||||
"log"
|
||||
"net/http"
|
||||
"runtime"
|
||||
"syscall/js"
|
||||
|
||||
"github.com/pkg/errors"
|
||||
"github.com/rclone/rclone/fs"
|
||||
"github.com/rclone/rclone/fs/rc"
|
||||
|
||||
// Core functionality we need
|
||||
_ "github.com/rclone/rclone/fs/operations"
|
||||
_ "github.com/rclone/rclone/fs/sync"
|
||||
|
||||
// _ "github.com/rclone/rclone/backend/all" // import all backends
|
||||
|
||||
// Backends
|
||||
_ "github.com/rclone/rclone/backend/memory"
|
||||
)
|
||||
|
||||
var (
|
||||
document js.Value
|
||||
jsJSON js.Value
|
||||
)
|
||||
|
||||
func getElementById(name string) js.Value {
|
||||
node := document.Call("getElementById", name)
|
||||
if node.IsUndefined() {
|
||||
log.Fatalf("Couldn't find element %q", name)
|
||||
}
|
||||
return node
|
||||
}
|
||||
|
||||
func time() int {
|
||||
return js.Global().Get("Date").New().Call("getTime").Int()
|
||||
}
|
||||
|
||||
func paramToValue(in rc.Params) (out js.Value) {
|
||||
return js.Value{}
|
||||
}
|
||||
|
||||
// errorValue turns an error into a js.Value
|
||||
func errorValue(method string, in js.Value, err error) js.Value {
|
||||
fs.Errorf(nil, "rc: %q: error: %v", method, err)
|
||||
// Adjust the error return for some well known errors
|
||||
errOrig := errors.Cause(err)
|
||||
status := http.StatusInternalServerError
|
||||
switch {
|
||||
case errOrig == fs.ErrorDirNotFound || errOrig == fs.ErrorObjectNotFound:
|
||||
status = http.StatusNotFound
|
||||
case rc.IsErrParamInvalid(err) || rc.IsErrParamNotFound(err):
|
||||
status = http.StatusBadRequest
|
||||
}
|
||||
return js.ValueOf(map[string]interface{}{
|
||||
"status": status,
|
||||
"error": err.Error(),
|
||||
"input": in,
|
||||
"path": method,
|
||||
})
|
||||
}
|
||||
|
||||
// rcCallback is a callback for javascript to access the api
|
||||
//
|
||||
// FIXME should this should return a promise so we can return errors properly?
|
||||
func rcCallback(this js.Value, args []js.Value) interface{} {
|
||||
ctx := context.Background() // FIXME
|
||||
log.Printf("rcCallback: this=%v args=%v", this, args)
|
||||
|
||||
if len(args) != 2 {
|
||||
return errorValue("", js.Undefined(), errors.New("need two parameters to rc call"))
|
||||
}
|
||||
method := args[0].String()
|
||||
inRaw := args[1]
|
||||
var in = rc.Params{}
|
||||
switch inRaw.Type() {
|
||||
case js.TypeNull:
|
||||
case js.TypeObject:
|
||||
inJSON := jsJSON.Call("stringify", inRaw).String()
|
||||
err := json.Unmarshal([]byte(inJSON), &in)
|
||||
if err != nil {
|
||||
return errorValue(method, inRaw, errors.Wrap(err, "couldn't unmarshal input"))
|
||||
}
|
||||
default:
|
||||
return errorValue(method, inRaw, errors.New("in parameter must be null or object"))
|
||||
}
|
||||
|
||||
call := rc.Calls.Get(method)
|
||||
if call == nil {
|
||||
return errorValue(method, inRaw, errors.Errorf("method %q not found", method))
|
||||
}
|
||||
|
||||
out, err := call.Fn(ctx, in)
|
||||
if err != nil {
|
||||
return errorValue(method, inRaw, errors.Wrap(err, "method call failed"))
|
||||
}
|
||||
if out == nil {
|
||||
return nil
|
||||
}
|
||||
var out2 map[string]interface{}
|
||||
err = rc.Reshape(&out2, out)
|
||||
if err != nil {
|
||||
return errorValue(method, inRaw, errors.Wrap(err, "result reshape failed"))
|
||||
}
|
||||
|
||||
return js.ValueOf(out2)
|
||||
}
|
||||
|
||||
func main() {
|
||||
log.Printf("Running on goos/goarch = %s/%s", runtime.GOOS, runtime.GOARCH)
|
||||
if js.Global().IsUndefined() {
|
||||
log.Fatalf("Didn't find Global - not running in browser")
|
||||
}
|
||||
document = js.Global().Get("document")
|
||||
if document.IsUndefined() {
|
||||
log.Fatalf("Didn't find document - not running in browser")
|
||||
}
|
||||
|
||||
jsJSON = js.Global().Get("JSON")
|
||||
if jsJSON.IsUndefined() {
|
||||
log.Fatalf("can't find JSON")
|
||||
}
|
||||
|
||||
// Set rc
|
||||
js.Global().Set("rc", js.FuncOf(rcCallback))
|
||||
|
||||
// Signal that it is valid
|
||||
rcValidResolve := js.Global().Get("rcValidResolve")
|
||||
if rcValidResolve.IsUndefined() {
|
||||
log.Fatalf("Didn't find rcValidResolve")
|
||||
}
|
||||
rcValidResolve.Invoke()
|
||||
|
||||
// Wait forever
|
||||
select {}
|
||||
}
|
||||
19
fs/rc/js/serve.go
Normal file
19
fs/rc/js/serve.go
Normal file
|
|
@ -0,0 +1,19 @@
|
|||
//+build none
|
||||
|
||||
package main
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"log"
|
||||
"mime"
|
||||
"net/http"
|
||||
)
|
||||
|
||||
func main() {
|
||||
mime.AddExtensionType(".wasm", "application/wasm")
|
||||
mime.AddExtensionType(".js", "application/javascript")
|
||||
mux := http.NewServeMux()
|
||||
mux.Handle("/", http.FileServer(http.Dir(".")))
|
||||
fmt.Printf("Serving on http://localhost:3000/\n")
|
||||
log.Fatal(http.ListenAndServe(":3000", mux))
|
||||
}
|
||||
588
fs/rc/js/wasm_exec.js
Normal file
588
fs/rc/js/wasm_exec.js
Normal file
|
|
@ -0,0 +1,588 @@
|
|||
// Copyright 2018 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
(() => {
|
||||
// Map multiple JavaScript environments to a single common API,
|
||||
// preferring web standards over Node.js API.
|
||||
//
|
||||
// Environments considered:
|
||||
// - Browsers
|
||||
// - Node.js
|
||||
// - Electron
|
||||
// - Parcel
|
||||
|
||||
if (typeof global !== "undefined") {
|
||||
// global already exists
|
||||
} else if (typeof window !== "undefined") {
|
||||
window.global = window;
|
||||
} else if (typeof self !== "undefined") {
|
||||
self.global = self;
|
||||
} else {
|
||||
throw new Error("cannot export Go (neither global, window nor self is defined)");
|
||||
}
|
||||
|
||||
if (!global.require && typeof require !== "undefined") {
|
||||
global.require = require;
|
||||
}
|
||||
|
||||
if (!global.fs && global.require) {
|
||||
const fs = require("fs");
|
||||
if (Object.keys(fs) !== 0) {
|
||||
global.fs = fs;
|
||||
}
|
||||
}
|
||||
|
||||
const enosys = () => {
|
||||
const err = new Error("not implemented");
|
||||
err.code = "ENOSYS";
|
||||
return err;
|
||||
};
|
||||
|
||||
if (!global.fs) {
|
||||
let outputBuf = "";
|
||||
global.fs = {
|
||||
constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused
|
||||
writeSync(fd, buf) {
|
||||
outputBuf += decoder.decode(buf);
|
||||
const nl = outputBuf.lastIndexOf("\n");
|
||||
if (nl != -1) {
|
||||
console.log(outputBuf.substr(0, nl));
|
||||
outputBuf = outputBuf.substr(nl + 1);
|
||||
}
|
||||
return buf.length;
|
||||
},
|
||||
write(fd, buf, offset, length, position, callback) {
|
||||
if (offset !== 0 || length !== buf.length || position !== null) {
|
||||
callback(enosys());
|
||||
return;
|
||||
}
|
||||
const n = this.writeSync(fd, buf);
|
||||
callback(null, n);
|
||||
},
|
||||
chmod(path, mode, callback) { callback(enosys()); },
|
||||
chown(path, uid, gid, callback) { callback(enosys()); },
|
||||
close(fd, callback) { callback(enosys()); },
|
||||
fchmod(fd, mode, callback) { callback(enosys()); },
|
||||
fchown(fd, uid, gid, callback) { callback(enosys()); },
|
||||
fstat(fd, callback) { callback(enosys()); },
|
||||
fsync(fd, callback) { callback(null); },
|
||||
ftruncate(fd, length, callback) { callback(enosys()); },
|
||||
lchown(path, uid, gid, callback) { callback(enosys()); },
|
||||
link(path, link, callback) { callback(enosys()); },
|
||||
lstat(path, callback) { callback(enosys()); },
|
||||
mkdir(path, perm, callback) { callback(enosys()); },
|
||||
open(path, flags, mode, callback) { callback(enosys()); },
|
||||
read(fd, buffer, offset, length, position, callback) { callback(enosys()); },
|
||||
readdir(path, callback) { callback(enosys()); },
|
||||
readlink(path, callback) { callback(enosys()); },
|
||||
rename(from, to, callback) { callback(enosys()); },
|
||||
rmdir(path, callback) { callback(enosys()); },
|
||||
stat(path, callback) { callback(enosys()); },
|
||||
symlink(path, link, callback) { callback(enosys()); },
|
||||
truncate(path, length, callback) { callback(enosys()); },
|
||||
unlink(path, callback) { callback(enosys()); },
|
||||
utimes(path, atime, mtime, callback) { callback(enosys()); },
|
||||
};
|
||||
}
|
||||
|
||||
if (!global.process) {
|
||||
global.process = {
|
||||
getuid() { return -1; },
|
||||
getgid() { return -1; },
|
||||
geteuid() { return -1; },
|
||||
getegid() { return -1; },
|
||||
getgroups() { throw enosys(); },
|
||||
pid: -1,
|
||||
ppid: -1,
|
||||
umask() { throw enosys(); },
|
||||
cwd() { throw enosys(); },
|
||||
chdir() { throw enosys(); },
|
||||
}
|
||||
}
|
||||
|
||||
if (!global.crypto) {
|
||||
const nodeCrypto = require("crypto");
|
||||
global.crypto = {
|
||||
getRandomValues(b) {
|
||||
nodeCrypto.randomFillSync(b);
|
||||
},
|
||||
};
|
||||
}
|
||||
|
||||
if (!global.performance) {
|
||||
global.performance = {
|
||||
now() {
|
||||
const [sec, nsec] = process.hrtime();
|
||||
return sec * 1000 + nsec / 1000000;
|
||||
},
|
||||
};
|
||||
}
|
||||
|
||||
if (!global.TextEncoder) {
|
||||
global.TextEncoder = require("util").TextEncoder;
|
||||
}
|
||||
|
||||
if (!global.TextDecoder) {
|
||||
global.TextDecoder = require("util").TextDecoder;
|
||||
}
|
||||
|
||||
// End of polyfills for common API.
|
||||
|
||||
const encoder = new TextEncoder("utf-8");
|
||||
const decoder = new TextDecoder("utf-8");
|
||||
|
||||
global.Go = class {
|
||||
constructor() {
|
||||
this.argv = ["js"];
|
||||
this.env = {};
|
||||
this.exit = (code) => {
|
||||
if (code !== 0) {
|
||||
console.warn("exit code:", code);
|
||||
}
|
||||
};
|
||||
this._exitPromise = new Promise((resolve) => {
|
||||
this._resolveExitPromise = resolve;
|
||||
});
|
||||
this._pendingEvent = null;
|
||||
this._scheduledTimeouts = new Map();
|
||||
this._nextCallbackTimeoutID = 1;
|
||||
|
||||
const setInt64 = (addr, v) => {
|
||||
this.mem.setUint32(addr + 0, v, true);
|
||||
this.mem.setUint32(addr + 4, Math.floor(v / 4294967296), true);
|
||||
}
|
||||
|
||||
const getInt64 = (addr) => {
|
||||
const low = this.mem.getUint32(addr + 0, true);
|
||||
const high = this.mem.getInt32(addr + 4, true);
|
||||
return low + high * 4294967296;
|
||||
}
|
||||
|
||||
const loadValue = (addr) => {
|
||||
const f = this.mem.getFloat64(addr, true);
|
||||
if (f === 0) {
|
||||
return undefined;
|
||||
}
|
||||
if (!isNaN(f)) {
|
||||
return f;
|
||||
}
|
||||
|
||||
const id = this.mem.getUint32(addr, true);
|
||||
return this._values[id];
|
||||
}
|
||||
|
||||
const storeValue = (addr, v) => {
|
||||
const nanHead = 0x7FF80000;
|
||||
|
||||
if (typeof v === "number" && v !== 0) {
|
||||
if (isNaN(v)) {
|
||||
this.mem.setUint32(addr + 4, nanHead, true);
|
||||
this.mem.setUint32(addr, 0, true);
|
||||
return;
|
||||
}
|
||||
this.mem.setFloat64(addr, v, true);
|
||||
return;
|
||||
}
|
||||
|
||||
if (v === undefined) {
|
||||
this.mem.setFloat64(addr, 0, true);
|
||||
return;
|
||||
}
|
||||
|
||||
let id = this._ids.get(v);
|
||||
if (id === undefined) {
|
||||
id = this._idPool.pop();
|
||||
if (id === undefined) {
|
||||
id = this._values.length;
|
||||
}
|
||||
this._values[id] = v;
|
||||
this._goRefCounts[id] = 0;
|
||||
this._ids.set(v, id);
|
||||
}
|
||||
this._goRefCounts[id]++;
|
||||
let typeFlag = 0;
|
||||
switch (typeof v) {
|
||||
case "object":
|
||||
if (v !== null) {
|
||||
typeFlag = 1;
|
||||
}
|
||||
break;
|
||||
case "string":
|
||||
typeFlag = 2;
|
||||
break;
|
||||
case "symbol":
|
||||
typeFlag = 3;
|
||||
break;
|
||||
case "function":
|
||||
typeFlag = 4;
|
||||
break;
|
||||
}
|
||||
this.mem.setUint32(addr + 4, nanHead | typeFlag, true);
|
||||
this.mem.setUint32(addr, id, true);
|
||||
}
|
||||
|
||||
const loadSlice = (addr) => {
|
||||
const array = getInt64(addr + 0);
|
||||
const len = getInt64(addr + 8);
|
||||
return new Uint8Array(this._inst.exports.mem.buffer, array, len);
|
||||
}
|
||||
|
||||
const loadSliceOfValues = (addr) => {
|
||||
const array = getInt64(addr + 0);
|
||||
const len = getInt64(addr + 8);
|
||||
const a = new Array(len);
|
||||
for (let i = 0; i < len; i++) {
|
||||
a[i] = loadValue(array + i * 8);
|
||||
}
|
||||
return a;
|
||||
}
|
||||
|
||||
const loadString = (addr) => {
|
||||
const saddr = getInt64(addr + 0);
|
||||
const len = getInt64(addr + 8);
|
||||
return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len));
|
||||
}
|
||||
|
||||
const timeOrigin = Date.now() - performance.now();
|
||||
this.importObject = {
|
||||
go: {
|
||||
// Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters)
|
||||
// may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported
|
||||
// function. A goroutine can switch to a new stack if the current stack is too small (see morestack function).
|
||||
// This changes the SP, thus we have to update the SP used by the imported function.
|
||||
|
||||
// func wasmExit(code int32)
|
||||
"runtime.wasmExit": (sp) => {
|
||||
const code = this.mem.getInt32(sp + 8, true);
|
||||
this.exited = true;
|
||||
delete this._inst;
|
||||
delete this._values;
|
||||
delete this._goRefCounts;
|
||||
delete this._ids;
|
||||
delete this._idPool;
|
||||
this.exit(code);
|
||||
},
|
||||
|
||||
// func wasmWrite(fd uintptr, p unsafe.Pointer, n int32)
|
||||
"runtime.wasmWrite": (sp) => {
|
||||
const fd = getInt64(sp + 8);
|
||||
const p = getInt64(sp + 16);
|
||||
const n = this.mem.getInt32(sp + 24, true);
|
||||
fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n));
|
||||
},
|
||||
|
||||
// func resetMemoryDataView()
|
||||
"runtime.resetMemoryDataView": (sp) => {
|
||||
this.mem = new DataView(this._inst.exports.mem.buffer);
|
||||
},
|
||||
|
||||
// func nanotime1() int64
|
||||
"runtime.nanotime1": (sp) => {
|
||||
setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
|
||||
},
|
||||
|
||||
// func walltime1() (sec int64, nsec int32)
|
||||
"runtime.walltime1": (sp) => {
|
||||
const msec = (new Date).getTime();
|
||||
setInt64(sp + 8, msec / 1000);
|
||||
this.mem.setInt32(sp + 16, (msec % 1000) * 1000000, true);
|
||||
},
|
||||
|
||||
// func scheduleTimeoutEvent(delay int64) int32
|
||||
"runtime.scheduleTimeoutEvent": (sp) => {
|
||||
const id = this._nextCallbackTimeoutID;
|
||||
this._nextCallbackTimeoutID++;
|
||||
this._scheduledTimeouts.set(id, setTimeout(
|
||||
() => {
|
||||
this._resume();
|
||||
while (this._scheduledTimeouts.has(id)) {
|
||||
// for some reason Go failed to register the timeout event, log and try again
|
||||
// (temporary workaround for https://github.com/golang/go/issues/28975)
|
||||
console.warn("scheduleTimeoutEvent: missed timeout event");
|
||||
this._resume();
|
||||
}
|
||||
},
|
||||
getInt64(sp + 8) + 1, // setTimeout has been seen to fire up to 1 millisecond early
|
||||
));
|
||||
this.mem.setInt32(sp + 16, id, true);
|
||||
},
|
||||
|
||||
// func clearTimeoutEvent(id int32)
|
||||
"runtime.clearTimeoutEvent": (sp) => {
|
||||
const id = this.mem.getInt32(sp + 8, true);
|
||||
clearTimeout(this._scheduledTimeouts.get(id));
|
||||
this._scheduledTimeouts.delete(id);
|
||||
},
|
||||
|
||||
// func getRandomData(r []byte)
|
||||
"runtime.getRandomData": (sp) => {
|
||||
crypto.getRandomValues(loadSlice(sp + 8));
|
||||
},
|
||||
|
||||
// func finalizeRef(v ref)
|
||||
"syscall/js.finalizeRef": (sp) => {
|
||||
const id = this.mem.getUint32(sp + 8, true);
|
||||
this._goRefCounts[id]--;
|
||||
if (this._goRefCounts[id] === 0) {
|
||||
const v = this._values[id];
|
||||
this._values[id] = null;
|
||||
this._ids.delete(v);
|
||||
this._idPool.push(id);
|
||||
}
|
||||
},
|
||||
|
||||
// func stringVal(value string) ref
|
||||
"syscall/js.stringVal": (sp) => {
|
||||
storeValue(sp + 24, loadString(sp + 8));
|
||||
},
|
||||
|
||||
// func valueGet(v ref, p string) ref
|
||||
"syscall/js.valueGet": (sp) => {
|
||||
const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16));
|
||||
sp = this._inst.exports.getsp(); // see comment above
|
||||
storeValue(sp + 32, result);
|
||||
},
|
||||
|
||||
// func valueSet(v ref, p string, x ref)
|
||||
"syscall/js.valueSet": (sp) => {
|
||||
Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32));
|
||||
},
|
||||
|
||||
// func valueDelete(v ref, p string)
|
||||
"syscall/js.valueDelete": (sp) => {
|
||||
Reflect.deleteProperty(loadValue(sp + 8), loadString(sp + 16));
|
||||
},
|
||||
|
||||
// func valueIndex(v ref, i int) ref
|
||||
"syscall/js.valueIndex": (sp) => {
|
||||
storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16)));
|
||||
},
|
||||
|
||||
// valueSetIndex(v ref, i int, x ref)
|
||||
"syscall/js.valueSetIndex": (sp) => {
|
||||
Reflect.set(loadValue(sp + 8), getInt64(sp + 16), loadValue(sp + 24));
|
||||
},
|
||||
|
||||
// func valueCall(v ref, m string, args []ref) (ref, bool)
|
||||
"syscall/js.valueCall": (sp) => {
|
||||
try {
|
||||
const v = loadValue(sp + 8);
|
||||
const m = Reflect.get(v, loadString(sp + 16));
|
||||
const args = loadSliceOfValues(sp + 32);
|
||||
const result = Reflect.apply(m, v, args);
|
||||
sp = this._inst.exports.getsp(); // see comment above
|
||||
storeValue(sp + 56, result);
|
||||
this.mem.setUint8(sp + 64, 1);
|
||||
} catch (err) {
|
||||
storeValue(sp + 56, err);
|
||||
this.mem.setUint8(sp + 64, 0);
|
||||
}
|
||||
},
|
||||
|
||||
// func valueInvoke(v ref, args []ref) (ref, bool)
|
||||
"syscall/js.valueInvoke": (sp) => {
|
||||
try {
|
||||
const v = loadValue(sp + 8);
|
||||
const args = loadSliceOfValues(sp + 16);
|
||||
const result = Reflect.apply(v, undefined, args);
|
||||
sp = this._inst.exports.getsp(); // see comment above
|
||||
storeValue(sp + 40, result);
|
||||
this.mem.setUint8(sp + 48, 1);
|
||||
} catch (err) {
|
||||
storeValue(sp + 40, err);
|
||||
this.mem.setUint8(sp + 48, 0);
|
||||
}
|
||||
},
|
||||
|
||||
// func valueNew(v ref, args []ref) (ref, bool)
|
||||
"syscall/js.valueNew": (sp) => {
|
||||
try {
|
||||
const v = loadValue(sp + 8);
|
||||
const args = loadSliceOfValues(sp + 16);
|
||||
const result = Reflect.construct(v, args);
|
||||
sp = this._inst.exports.getsp(); // see comment above
|
||||
storeValue(sp + 40, result);
|
||||
this.mem.setUint8(sp + 48, 1);
|
||||
} catch (err) {
|
||||
storeValue(sp + 40, err);
|
||||
this.mem.setUint8(sp + 48, 0);
|
||||
}
|
||||
},
|
||||
|
||||
// func valueLength(v ref) int
|
||||
"syscall/js.valueLength": (sp) => {
|
||||
setInt64(sp + 16, parseInt(loadValue(sp + 8).length));
|
||||
},
|
||||
|
||||
// valuePrepareString(v ref) (ref, int)
|
||||
"syscall/js.valuePrepareString": (sp) => {
|
||||
const str = encoder.encode(String(loadValue(sp + 8)));
|
||||
storeValue(sp + 16, str);
|
||||
setInt64(sp + 24, str.length);
|
||||
},
|
||||
|
||||
// valueLoadString(v ref, b []byte)
|
||||
"syscall/js.valueLoadString": (sp) => {
|
||||
const str = loadValue(sp + 8);
|
||||
loadSlice(sp + 16).set(str);
|
||||
},
|
||||
|
||||
// func valueInstanceOf(v ref, t ref) bool
|
||||
"syscall/js.valueInstanceOf": (sp) => {
|
||||
this.mem.setUint8(sp + 24, (loadValue(sp + 8) instanceof loadValue(sp + 16)) ? 1 : 0);
|
||||
},
|
||||
|
||||
// func copyBytesToGo(dst []byte, src ref) (int, bool)
|
||||
"syscall/js.copyBytesToGo": (sp) => {
|
||||
const dst = loadSlice(sp + 8);
|
||||
const src = loadValue(sp + 32);
|
||||
if (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) {
|
||||
this.mem.setUint8(sp + 48, 0);
|
||||
return;
|
||||
}
|
||||
const toCopy = src.subarray(0, dst.length);
|
||||
dst.set(toCopy);
|
||||
setInt64(sp + 40, toCopy.length);
|
||||
this.mem.setUint8(sp + 48, 1);
|
||||
},
|
||||
|
||||
// func copyBytesToJS(dst ref, src []byte) (int, bool)
|
||||
"syscall/js.copyBytesToJS": (sp) => {
|
||||
const dst = loadValue(sp + 8);
|
||||
const src = loadSlice(sp + 16);
|
||||
if (!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)) {
|
||||
this.mem.setUint8(sp + 48, 0);
|
||||
return;
|
||||
}
|
||||
const toCopy = src.subarray(0, dst.length);
|
||||
dst.set(toCopy);
|
||||
setInt64(sp + 40, toCopy.length);
|
||||
this.mem.setUint8(sp + 48, 1);
|
||||
},
|
||||
|
||||
"debug": (value) => {
|
||||
console.log(value);
|
||||
},
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
async run(instance) {
|
||||
this._inst = instance;
|
||||
this.mem = new DataView(this._inst.exports.mem.buffer);
|
||||
this._values = [ // JS values that Go currently has references to, indexed by reference id
|
||||
NaN,
|
||||
0,
|
||||
null,
|
||||
true,
|
||||
false,
|
||||
global,
|
||||
this,
|
||||
];
|
||||
this._goRefCounts = new Array(this._values.length).fill(Infinity); // number of references that Go has to a JS value, indexed by reference id
|
||||
this._ids = new Map([ // mapping from JS values to reference ids
|
||||
[0, 1],
|
||||
[null, 2],
|
||||
[true, 3],
|
||||
[false, 4],
|
||||
[global, 5],
|
||||
[this, 6],
|
||||
]);
|
||||
this._idPool = []; // unused ids that have been garbage collected
|
||||
this.exited = false; // whether the Go program has exited
|
||||
|
||||
// Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory.
|
||||
let offset = 4096;
|
||||
|
||||
const strPtr = (str) => {
|
||||
const ptr = offset;
|
||||
const bytes = encoder.encode(str + "\0");
|
||||
new Uint8Array(this.mem.buffer, offset, bytes.length).set(bytes);
|
||||
offset += bytes.length;
|
||||
if (offset % 8 !== 0) {
|
||||
offset += 8 - (offset % 8);
|
||||
}
|
||||
return ptr;
|
||||
};
|
||||
|
||||
const argc = this.argv.length;
|
||||
|
||||
const argvPtrs = [];
|
||||
this.argv.forEach((arg) => {
|
||||
argvPtrs.push(strPtr(arg));
|
||||
});
|
||||
argvPtrs.push(0);
|
||||
|
||||
const keys = Object.keys(this.env).sort();
|
||||
keys.forEach((key) => {
|
||||
argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
|
||||
});
|
||||
argvPtrs.push(0);
|
||||
|
||||
const argv = offset;
|
||||
argvPtrs.forEach((ptr) => {
|
||||
this.mem.setUint32(offset, ptr, true);
|
||||
this.mem.setUint32(offset + 4, 0, true);
|
||||
offset += 8;
|
||||
});
|
||||
|
||||
this._inst.exports.run(argc, argv);
|
||||
if (this.exited) {
|
||||
this._resolveExitPromise();
|
||||
}
|
||||
await this._exitPromise;
|
||||
}
|
||||
|
||||
_resume() {
|
||||
if (this.exited) {
|
||||
throw new Error("Go program has already exited");
|
||||
}
|
||||
this._inst.exports.resume();
|
||||
if (this.exited) {
|
||||
this._resolveExitPromise();
|
||||
}
|
||||
}
|
||||
|
||||
_makeFuncWrapper(id) {
|
||||
const go = this;
|
||||
return function () {
|
||||
const event = { id: id, this: this, args: arguments };
|
||||
go._pendingEvent = event;
|
||||
go._resume();
|
||||
return event.result;
|
||||
};
|
||||
}
|
||||
}
|
||||
|
||||
if (
|
||||
global.require &&
|
||||
global.require.main === module &&
|
||||
global.process &&
|
||||
global.process.versions &&
|
||||
!global.process.versions.electron
|
||||
) {
|
||||
if (process.argv.length < 3) {
|
||||
console.error("usage: go_js_wasm_exec [wasm binary] [arguments]");
|
||||
process.exit(1);
|
||||
}
|
||||
|
||||
const go = new Go();
|
||||
go.argv = process.argv.slice(2);
|
||||
go.env = Object.assign({ TMPDIR: require("os").tmpdir() }, process.env);
|
||||
go.exit = process.exit;
|
||||
WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => {
|
||||
process.on("exit", (code) => { // Node.js exits if no event handler is pending
|
||||
if (code === 0 && !go.exited) {
|
||||
// deadlock, make Go print error and stack traces
|
||||
go._pendingEvent = { id: 0 };
|
||||
go._resume();
|
||||
}
|
||||
});
|
||||
return go.run(result.instance);
|
||||
}).catch((err) => {
|
||||
console.error(err);
|
||||
process.exit(1);
|
||||
});
|
||||
}
|
||||
})();
|
||||
Loading…
Reference in New Issue
Block a user