diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0f8678b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+node_modules/
+*.wasm
diff --git a/LICENSE b/LICENSE
index 261eeb9..ff42636 100644
--- a/LICENSE
+++ b/LICENSE
@@ -186,7 +186,7 @@
same "printed page" as the copyright notice for easier
identification within third-party archives.
- Copyright [yyyy] [name of copyright owner]
+ Copyright 2019 Nicolas Lepage
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..73b4ccb
--- /dev/null
+++ b/README.md
@@ -0,0 +1,53 @@
+Welcome to go-wasm-http-server 👋
+
+ 
+
+ 
+
+
+ 
+
+
+ 
+
+
+
+> WebAssembly Go HTTP Server embedded in a ServiceWorker
+
+### ✨ [Demo](https://nlepage.github.io/go-wasm-http-server/demo/)
+
+## Install
+
+```sh
+yarn add go-wasm-http-server
+```
+
+## Usage
+
+```sh
+usage
+```
+
+## Author
+
+👤 **Nicolas Lepage**
+
+* Website: https://nicolas.lepage.dev
+* Twitter: [@njblepage](https://twitter.com/njblepage)
+* Github: [@nlepage](https://github.com/nlepage)
+
+## 🤝 Contributing
+
+Contributions, issues and feature requests are welcome!
Feel free to check [issues page](https://github.com/nlepage/go-wasm-http-server/issues).
+
+## Show your support
+
+Give a ⭐️ if this project helped you!
+
+## 📝 License
+
+Copyright © 2019 [Nicolas Lepage](https://github.com/nlepage).
+This project is [Apache 2.0](https://github.com/nlepage/go-wasm-http-server/blob/master/LICENSE) licensed.
+
+***
+_This README was generated with ❤️ by [readme-md-generator](https://github.com/kefranabg/readme-md-generator)_
\ No newline at end of file
diff --git a/lib/wasm_exec/LICENSE b/lib/wasm_exec/LICENSE
new file mode 100644
index 0000000..6a66aea
--- /dev/null
+++ b/lib/wasm_exec/LICENSE
@@ -0,0 +1,27 @@
+Copyright (c) 2009 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+ * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+ * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/lib/wasm_exec/wasm_exec.js b/lib/wasm_exec/wasm_exec.js
new file mode 100644
index 0000000..a54bb9a
--- /dev/null
+++ b/lib/wasm_exec/wasm_exec.js
@@ -0,0 +1,533 @@
+// 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) {
+ global.fs = require("fs");
+ }
+
+ 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) {
+ throw new Error("not implemented");
+ }
+ const n = this.writeSync(fd, buf);
+ callback(null, n);
+ },
+ open(path, flags, mode, callback) {
+ const err = new Error("not implemented");
+ err.code = "ENOSYS";
+ callback(err);
+ },
+ read(fd, buffer, offset, length, position, callback) {
+ const err = new Error("not implemented");
+ err.code = "ENOSYS";
+ callback(err);
+ },
+ fsync(fd, callback) {
+ callback(null);
+ },
+ };
+ }
+
+ 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 mem = () => {
+ // The buffer may change when requesting more memory.
+ return new DataView(this._inst.exports.mem.buffer);
+ }
+
+ const setInt64 = (addr, v) => {
+ mem().setUint32(addr + 0, v, true);
+ mem().setUint32(addr + 4, Math.floor(v / 4294967296), true);
+ }
+
+ const getInt64 = (addr) => {
+ const low = mem().getUint32(addr + 0, true);
+ const high = mem().getInt32(addr + 4, true);
+ return low + high * 4294967296;
+ }
+
+ const loadValue = (addr) => {
+ const f = mem().getFloat64(addr, true);
+ if (f === 0) {
+ return undefined;
+ }
+ if (!isNaN(f)) {
+ return f;
+ }
+
+ const id = mem().getUint32(addr, true);
+ return this._values[id];
+ }
+
+ const storeValue = (addr, v) => {
+ const nanHead = 0x7FF80000;
+
+ if (typeof v === "number") {
+ if (isNaN(v)) {
+ mem().setUint32(addr + 4, nanHead, true);
+ mem().setUint32(addr, 0, true);
+ return;
+ }
+ if (v === 0) {
+ mem().setUint32(addr + 4, nanHead, true);
+ mem().setUint32(addr, 1, true);
+ return;
+ }
+ mem().setFloat64(addr, v, true);
+ return;
+ }
+
+ switch (v) {
+ case undefined:
+ mem().setFloat64(addr, 0, true);
+ return;
+ case null:
+ mem().setUint32(addr + 4, nanHead, true);
+ mem().setUint32(addr, 2, true);
+ return;
+ case true:
+ mem().setUint32(addr + 4, nanHead, true);
+ mem().setUint32(addr, 3, true);
+ return;
+ case false:
+ mem().setUint32(addr + 4, nanHead, true);
+ mem().setUint32(addr, 4, true);
+ return;
+ }
+
+ let ref = this._refs.get(v);
+ if (ref === undefined) {
+ ref = this._values.length;
+ this._values.push(v);
+ this._refs.set(v, ref);
+ }
+ let typeFlag = 0;
+ switch (typeof v) {
+ case "string":
+ typeFlag = 1;
+ break;
+ case "symbol":
+ typeFlag = 2;
+ break;
+ case "function":
+ typeFlag = 3;
+ break;
+ }
+ mem().setUint32(addr + 4, nanHead | typeFlag, true);
+ mem().setUint32(addr, ref, 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 = mem().getInt32(sp + 8, true);
+ this.exited = true;
+ delete this._inst;
+ delete this._values;
+ delete this._refs;
+ 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 = mem().getInt32(sp + 24, true);
+ fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n));
+ },
+
+ // func nanotime() int64
+ "runtime.nanotime": (sp) => {
+ setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
+ },
+
+ // func walltime() (sec int64, nsec int32)
+ "runtime.walltime": (sp) => {
+ const msec = (new Date).getTime();
+ setInt64(sp + 8, msec / 1000);
+ 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
+ ));
+ mem().setInt32(sp + 16, id, true);
+ },
+
+ // func clearTimeoutEvent(id int32)
+ "runtime.clearTimeoutEvent": (sp) => {
+ const id = 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 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 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);
+ mem().setUint8(sp + 64, 1);
+ } catch (err) {
+ storeValue(sp + 56, err);
+ 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);
+ mem().setUint8(sp + 48, 1);
+ } catch (err) {
+ storeValue(sp + 40, err);
+ 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);
+ mem().setUint8(sp + 48, 1);
+ } catch (err) {
+ storeValue(sp + 40, err);
+ 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) => {
+ mem().setUint8(sp + 24, loadValue(sp + 8) instanceof loadValue(sp + 16));
+ },
+
+ // 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)) {
+ mem().setUint8(sp + 48, 0);
+ return;
+ }
+ const toCopy = src.subarray(0, dst.length);
+ dst.set(toCopy);
+ setInt64(sp + 40, toCopy.length);
+ 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)) {
+ mem().setUint8(sp + 48, 0);
+ return;
+ }
+ const toCopy = src.subarray(0, dst.length);
+ dst.set(toCopy);
+ setInt64(sp + 40, toCopy.length);
+ mem().setUint8(sp + 48, 1);
+ },
+
+ "debug": (value) => {
+ console.log(value);
+ },
+ }
+ };
+ }
+
+ async run(instance) {
+ this._inst = instance;
+ this._values = [ // TODO: garbage collection
+ NaN,
+ 0,
+ null,
+ true,
+ false,
+ global,
+ this,
+ ];
+ this._refs = new Map();
+ this.exited = false;
+
+ const mem = new DataView(this._inst.exports.mem.buffer)
+
+ // 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(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));
+ });
+
+ const keys = Object.keys(this.env).sort();
+ argvPtrs.push(keys.length);
+ keys.forEach((key) => {
+ argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
+ });
+
+ const argv = offset;
+ argvPtrs.forEach((ptr) => {
+ mem.setUint32(offset, ptr, true);
+ 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);
+ });
+ }
+})();
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..33dd3a8
--- /dev/null
+++ b/package.json
@@ -0,0 +1,9 @@
+{
+ "name": "go-wasm-http-server",
+ "version": "0.1.0",
+ "description": "WebAssembly Go HTTP Server embedded in a ServiceWorker",
+ "main": "index.js",
+ "repository": "https://github.com/nlepage/go-wasm-http-server",
+ "author": "Nicolas Lepage <19571875+nlepage@users.noreply.github.com>",
+ "license": "Apache-2.0"
+}
diff --git a/promise.go b/promise.go
new file mode 100644
index 0000000..60bfe43
--- /dev/null
+++ b/promise.go
@@ -0,0 +1,57 @@
+// +build js,wasm
+
+package wasmhttp
+
+import (
+ "syscall/js"
+)
+
+// Promise is JS Promise
+type Promise js.Value
+
+// NewPromise creates a new JS Promise
+func NewPromise(cb func(resolve, reject func(interface{}))) Promise {
+ var cbFunc js.Func
+
+ cbFunc = js.FuncOf(func(_ js.Value, args []js.Value) interface{} {
+ defer cbFunc.Release()
+
+ cb(
+ func(v interface{}) {
+ args[0].Invoke(v)
+ },
+ func(v interface{}) {
+ args[1].Invoke(v)
+ },
+ )
+
+ return js.Undefined()
+ })
+
+ return Promise(js.Global().Get("Promise").New(cbFunc))
+}
+
+// Await waits for the Promise to be resolved and returns the value
+func (p Promise) Await() js.Value {
+ ch := make(chan js.Value)
+ p.Then(func(v js.Value) {
+ ch <- v
+ })
+ return <-ch
+}
+
+// Then calls cb with the value when the Promise is resolved
+func (p Promise) Then(cb func(js.Value)) {
+ var then js.Func
+ then = js.FuncOf(func(_ js.Value, args []js.Value) interface{} {
+ defer then.Release()
+ cb(args[0])
+ return nil
+ })
+ js.Value(p).Call("then", then)
+}
+
+// Value returns the Promise as a js.Value
+func (p Promise) Value() js.Value {
+ return js.Value(p)
+}