WASM instance setup (#11)

* Code for running wasm file.

* Add test for wasm exported function.

* Use target names for build files.

Co-authored-by: nabarun <nabarun@deepstacksoft.com>

packages/graph-node/.eslintrc.json

@@ -14,5 +14,8 @@
     },
     "plugins": [
         "@typescript-eslint"
-    ]
+    ],
+    "rules": {
+        "@typescript-eslint/no-explicit-any": "off"
+    }
 }

packages/graph-node/.mocharc.yml

@@ -0,0 +1 @@
+require: 'ts-node/register'

packages/graph-node/asconfig.json

@@ -0,0 +1,20 @@
+{
+  "targets": {
+    "debug": {
+      "binaryFile": "build/debug.wasm",
+      "textFile": "build/debug.wat",
+      "sourceMap": true,
+      "debug": true
+    },
+    "release": {
+      "binaryFile": "build/release.wasm",
+      "textFile": "build/release.wat",
+      "sourceMap": true,
+      "optimizeLevel": 3,
+      "shrinkLevel": 0,
+      "converge": false,
+      "noAssert": false
+    }
+  },
+  "options": {}
+}

packages/graph-node/assembly/index.ts

@@ -0,0 +1,5 @@
+// The entry file of your WebAssembly module.
+
+export function add (a: i32, b: i32): i32 {
+  return a + b;
+}

packages/graph-node/assembly/tsconfig.json

@@ -0,0 +1,6 @@
+{
+  "extends": "assemblyscript/std/assembly.json",
+  "include": [
+    "./**/*.ts"
+  ]
+}

packages/graph-node/package.json

@@ -6,6 +6,7 @@
   "devDependencies": {
     "@typescript-eslint/eslint-plugin": "^4.25.0",
     "@typescript-eslint/parser": "^4.25.0",
+    "assemblyscript": "^0.19.16",
     "eslint": "^7.27.0",
     "eslint-config-semistandard": "^15.0.1",
     "eslint-config-standard": "^16.0.3",
@@ -13,10 +14,19 @@
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-promise": "^5.1.0",
     "eslint-plugin-standard": "^5.0.0",
-    "typescript": "^4.3.2"
+    "typescript": "^4.3.2",
+    "nodemon": "^2.0.7",
+    "ts-node": "^10.0.0"
   },
   "scripts": {
     "lint": "eslint .",
-    "build": "tsc"
+    "build": "tsc",
+    "asbuild:debug": "asc assembly/index.ts --target debug",
+    "asbuild:release": "asc assembly/index.ts --target release",
+    "asbuild": "yarn asbuild:debug && yarn asbuild:release",
+    "test": "mocha src/**/*.test.ts"
+  },
+  "dependencies": {
+    "@assemblyscript/loader": "^0.19.16"
   }
 }

packages/graph-node/src/index.test.ts

@@ -0,0 +1,17 @@
+//
+// Copyright 2021 Vulcanize, Inc.
+//
+
+import { expect } from 'chai';
+import path from 'path';
+import 'mocha';
+
+import { getExports } from './index';
+
+const WASM_FILE_PATH = '../build/debug.wasm';
+
+it('should execute exported function', async () => {
+  const filePath = path.resolve(__dirname, WASM_FILE_PATH);
+  const { exports } = await getExports(filePath);
+  expect(exports.add(1, 2)).to.equal(3);
+});

packages/graph-node/src/index.ts

@@ -1,3 +1,13 @@
 //
 // Copyright 2021 Vulcanize, Inc.
 //
+
+import fs from 'fs/promises';
+import loader from '@assemblyscript/loader';
+
+const imports = { /* imports go here */ };
+
+export const getExports = async (filePath: string): Promise<loader.ResultObject & { exports: any }> => {
+  const buffer = await fs.readFile(filePath);
+  return loader.instantiate(buffer, imports);
+};