Initial Commit

Author: gja

.gitignore

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+/dist
+/node_modules

index.ts

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+module.exports = {
+  "roots": [
+    "<rootDir>/src"
+  ],
+  "testMatch": [
+    "**/__tests__/**/*.+(ts|tsx|js)",
+    "**/?(*.)+(spec|test).+(ts|tsx|js)"
+  ],
+  "transform": {
+    "^.+\\.(ts|tsx)$": "ts-jest"
+  },
+}

jest.config.js

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+{
+  "name": "kappa-mu",
+  "version": "1.0.0",
+  "description": "Serverless Framework for Dgraph",
+  "main": "dist/index.js",
+  "scripts": {
+    "test": "jest"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/dgraph-io/kappa-mu.git"
+  },
+  "keywords": [
+    "dgraph"
+  ],
+  "author": "Tejas Dinkar <[email protected]>",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/dgraph-io/kappa-mu/issues"
+  },
+  "homepage": "https://github.com/dgraph-io/kappa-mu#readme",
+  "dependencies": {
+    "@types/node-fetch": "^2.5.7",
+    "atob": "^2.1.2",
+    "btoa": "^1.2.1",
+    "event-target-shim": "^5.0.1",
+    "express": "^4.17.1",
+    "node-fetch": "^2.6.1"
+  },
+  "devDependencies": {
+    "@types/jest": "^26.0.14",
+    "jest": "^26.4.2",
+    "ts-jest": "^26.3.0",
+    "typescript": "^4.0.2"
+  }
+}

package-lock.json

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+import { evaluateScript } from './evaluate-script';
+
+describe(evaluateScript, () => {
+  it("returns undefined if there was no event", async () => {
+    const runScript = evaluateScript("")
+    expect(await runScript({type: "Query.unknown", args: [], parent: null})).toBeUndefined()
+  })
+
+  it("returns the value if there was a resolver registered", async () => {
+    const runScript = evaluateScript(`addGraphQLResolvers({
+      "Query.fortyTwo": async e => 42
+    })`)
+    expect(await runScript({ type: "Query.fortyTwo", args: [], parent: null })).toBe(42)
+  })
+
+  it("passes the args and parents over", async () => {
+    const runScript = evaluateScript(`addGraphQLResolvers({
+      "Query.fortyTwo": ({parent, args}) => parent.n + args[0]
+    })`)
+    expect(await runScript({ type: "Query.fortyTwo", args: [1], parent: {n: 41} })).toBe(42)
+  })
+})

package.json

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+import { EventTarget } from 'event-target-shim';
+import vm from 'vm';
+
+const { Request, Response, Headers } = require("node-fetch");
+const { URL } = require("url");
+const fetch = require("node-fetch");
+const atob = require("atob");
+const btoa = require("btoa");
+// const crypto = new (require("node-webcrypto-ossl"))();
+const { TextDecoder, TextEncoder } = require("util");
+
+type GraphQLEventFields = {
+  type: string,
+  parent: Record<string, any> | null,
+  args: any[],
+}
+
+type GraphQLEvent = GraphQLEventFields & {
+  respondWith: (r: any | Promise<any>) => void,
+}
+
+class GraphQLResolverEventTarget extends EventTarget {
+  addGraphQLResolvers(resolvers: {[key: string]: (e: GraphQLEvent) => (any | Promise<any>)}) {
+    for (const [name, resolver] of Object.entries(resolvers)) {
+      this.addEventListener(name, e => {
+        const event = e as unknown as GraphQLEvent;
+        event.respondWith(resolver(event))
+      })
+    }
+  }
+}
+
+function newContext(eventTarget: GraphQLResolverEventTarget) {
+  return vm.createContext({
+    // From fetch
+    fetch,
+    Request,
+    Response,
+    Headers,
+
+    // URL Standards
+    URL,
+    URLSearchParams,
+
+    // bas64
+    atob,
+    btoa,
+
+    // Crypto
+    // crypto,
+    TextDecoder,
+    TextEncoder,
+
+    // Debugging
+    console,
+
+    // Async
+    setTimeout,
+    setInterval,
+    clearTimeout,
+    clearInterval,
+
+    // EventTarget
+    self: eventTarget,
+    addEventListener: eventTarget.addEventListener.bind(eventTarget),
+    removeEventListener: eventTarget.removeEventListener.bind(eventTarget),
+    addGraphQLResolvers: eventTarget.addGraphQLResolvers.bind(eventTarget),
+  });
+}
+
+export function evaluateScript(source: string) {
+  const script = new vm.Script(source)
+  const target = new GraphQLResolverEventTarget();
+  const context = newContext(target)
+  script.runInContext(context);
+
+  return async function(e: GraphQLEventFields): Promise<any> {
+    let ret = undefined;
+    const event = {
+      ...e,
+      respondWith: (x: any | Promise<any>) => { ret = x }
+    }
+    target.dispatchEvent(event)
+    return await ret;
+  }
+}

src/evaluate-script.test.ts

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+{
+  "compilerOptions": {
+    /* Visit https://aka.ms/tsconfig.json to read more about this file */
+
+    /* Basic Options */
+    // "incremental": true,                   /* Enable incremental compilation */
+    "target": "es2017",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
+    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
+    // "lib": [],                             /* Specify library files to be included in the compilation. */
+    // "allowJs": true,                       /* Allow javascript files to be compiled. */
+    // "checkJs": true,                       /* Report errors in .js files. */
+    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
+    // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
+    // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
+    "sourceMap": true,                        /* Generates corresponding '.map' file. */
+    // "outFile": "./",                       /* Concatenate and emit output to single file. */
+    "outDir": "dist",                         /* Redirect output structure to the directory. */
+    // "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    // "composite": true,                     /* Enable project compilation */
+    // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */
+    // "removeComments": true,                /* Do not emit comments to output. */
+    // "noEmit": true,                        /* Do not emit outputs. */
+    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
+    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+    /* Strict Type-Checking Options */
+    "strict": true,                           /* Enable all strict type-checking options. */
+    // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,              /* Enable strict null checks. */
+    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
+    // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
+    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
+    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+
+    /* Additional Checks */
+    // "noUnusedLocals": true,                /* Report errors on unused locals. */
+    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
+    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
+    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
+
+    /* Module Resolution Options */
+    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                       /* List of folders to include type definitions from. */
+    // "types": [],                           /* Type declaration files to be included in compilation. */
+    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+    "esModuleInterop": true,                  /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
+    // "allowUmdGlobalAccess": true,          /* Allow accessing UMD globals from modules. */
+
+    /* Source Map Options */
+    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+    /* Experimental Options */
+    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+
+    /* Advanced Options */
+    "skipLibCheck": true,                     /* Skip type checking of declaration files. */
+    "forceConsistentCasingInFileNames": true  /* Disallow inconsistently-cased references to the same file. */
+  }
+}