Update wasm bridge

README.md

@@ -1,31 +1,38 @@
 # Better Go Playground
 
+[![Docker Hub](https://img.shields.io/docker/pulls/x1unix/go-playground.svg)](https://hub.docker.com/r/x1unix/go-playground)
+[![Docker Hub](https://img.shields.io/docker/v/x1unix/go-playground.svg?sort=date)](https://hub.docker.com/r/x1unix/go-playground)
 [![Build Status](https://travis-ci.org/x1unix/go-playground.svg?branch=master)](https://travis-ci.org/x1unix/go-playground) 
 [![Coverage Status](https://coveralls.io/repos/github/x1unix/go-playground/badge.svg?branch=dev)](https://coveralls.io/github/x1unix/go-playground?branch=dev)
 [![Goreportcard](https://goreportcard.com/badge/github.com/x1unix/go-playground)](https://goreportcard.com/report/github.com/x1unix/go-playground)
 
-Improved Go Playground powered by Monaco Editor and React
+Improved Go Playground powered by Monaco Editor and React - [https://goplay.tools/](https://goplay.tools)
 
-![alt text](./docs/demo.gif)
+![alt text](docs/demo.gif)
 
 ## Features
 
+* 🌚 Dark theme
 * 💡 Code autocomplete
 * 💾 Load and save files
 * 📔 Snippets and tutorials
+* ⚙ Customization (fonts, ligatures, etc)
 * 🛠 [WebAssembly](https://github.com/golang/go/wiki/WebAssembly) support
-* 🌚 Dark theme
 
 
-And more
+And more !
+
+## Installation
 
-## Demo
+### Docker
 
-[https://goplay.tools/](https://goplay.tools)
+Playground is available via [Docker Hub](https://hub.docker.com/r/x1unix/go-playground).
 
-## Installation
+See [wiki](https://github.com/x1unix/go-playground/wiki/Docker) for usage info.
+
+### Local instance
 
-Playground is available via [Docker Hub](https://hub.docker.com/r/x1unix/go-playground) or can be built and run locally (**Go 1.12+** and **Node.js** required):
+Service can be built and run locally (**Go 1.12+** and **Node.js** required):
 
 ```
 $ git clone https://github.com/x1unix/go-playground.git

web/src/services/go/foundation.ts

@@ -6,4 +6,15 @@ export type bytes = Array<number>;
 export type NodeCallback<T> = (Error, T) => void;
 
 export const encoder = new TextEncoder();
-export const decoder = new TextDecoder('utf-8');
+export const decoder = new TextDecoder('utf-8');
+
+
+export class SyscallError extends Error {
+    constructor(public code: string, message: string) {
+        super(message);
+    }
+}
+
+export const enosys = () => {
+    return new SyscallError('ENOSYS', 'not implemented')
+};

web/src/services/go/fs.ts

@@ -1,4 +1,4 @@
-import { NodeCallback } from './foundation';
+import { NodeCallback, enosys } from './foundation';
 
 export type FileDescriptor = number;
 
@@ -10,6 +10,29 @@ export interface IFileSystem {
     write(fd: FileDescriptor, buf: Uint8Array, offset: number, length: number, position: number, callback: NodeCallback<number>)
     open(path: string, flags, mode, callback)
     fsync(fd, callback)
+    chmod(path, mode, callback)
+    chown(path, uid, gid, callback)
+    close(fd, callback)
+    fchmod(fd, mode, callback)
+    fchown(fd, uid, gid, callback)
+    fstat(fd, callback)
+    fsync(fd, callback)
+    ftruncate(fd, length, callback)
+    lchown(path, uid, gid, callback)
+    link(path, link, callback)
+    lstat(path, callback)
+    mkdir(path, perm, callback)
+    open(path, flags, mode, callback)
+    read(fd, buffer, offset, length, position, callback)
+    readdir(path, callback)
+    readlink(path, callback)
+    rename(from, to, callback)
+    rmdir(path, callback)
+    stat(path, callback)
+    symlink(path, link, callback)
+    truncate(path, length, callback)
+    unlink(path, callback)
+    utimes(path, atime, mtime, callback)
 }
 
 /**
@@ -21,7 +44,9 @@ export interface IWriter {
 }
 
 /**
- * FileSystemWrapper is wrapper class for FS simulation
+ * FileSystemWrapper is file system stub implementation for browser
+ *
+ * Source: wasm_exec.js:39 in Go 1.14
  */
 export class FileSystemWrapper {
     descriptors = new Map<FileDescriptor, IWriter>();
@@ -42,32 +67,28 @@ export class FileSystemWrapper {
     writeSync(fd: FileDescriptor, buf: Uint8Array) {
         const writer = this.descriptors.get(fd);
         if (!writer) {
-            const err = new Error('not implemented');
-            err['code'] = 'ENOENT';
-            throw err;
+            throw enosys();
         }
 
         return writer.write(buf);
     }
 
     write(fd: FileDescriptor, buf: Uint8Array, offset: number, length: number, position: number, callback: NodeCallback<number>) {
         if (offset !== 0 || length !== buf.length || position !== null) {
-            throw new Error("not implemented");
+            callback(enosys(), null);
+            return;
         }
         const n = this.writeSync(fd, buf);
         callback(null, n);
     }
 
     open(path: string, flags, mode, callback) {
-        const err = new Error("not implemented");
-        err['code'] = "ENOSYS";
-        callback(err, null);
+        // TODO: implement file read-write
+        callback(enosys(), null);
     }
 
     read(fd: FileDescriptor, buffer, offset: number, length: number, position: number, callback: NodeCallback<any>) {
-        const err = new Error("not implemented");
-        err['code'] = "ENOSYS";
-        callback(err, null);
+        callback(enosys(), null);
     }
 
     fsync(fd, callback) {