chore: add init method to Noir class for web

.github/workflows/test-noir-js.yml

@@ -47,6 +47,9 @@ jobs:
 
       - name: Build noirc_abi
         run: yarn workspace @noir-lang/noirc_abi build
+
+      - name: Build barretenberg wrapper
+        run: yarn workspace @noir-lang/backend_barretenberg build
 
       - name: Run noir_js tests
         run: |

package.json

@@ -9,6 +9,7 @@
         "tooling/noir_js_types",
         "tooling/noirc_abi_wasm",
         "tooling/noir_js",
+        "tooling/noir_js_backend_barretenberg",
         "acvm-repo/acvm_js",
         "release-tests"
     ],

tooling/noir_js/src/program.ts

@@ -1,13 +1,25 @@
 /* eslint-disable  @typescript-eslint/no-explicit-any */
 import { Backend, CompiledCircuit } from '@noir-lang/types';
 import { generateWitness } from './witness_generation.js';
+import initAbi from '@noir-lang/noirc_abi';
+import initACVM from '@noir-lang/acvm_js';
 
 export class Noir {
   constructor(
     private circuit: CompiledCircuit,
     private backend: Backend,
   ) {}
 
+  async init(): Promise<void> {
+    // If these are available, then we are in the
+    // web environment. For the node environment, this
+    // is a no-op.
+    if (typeof initAbi === 'function') {
+      initAbi();
+      initACVM();
+    }
+  }
+
   // Initial inputs to your program
   async generateFinalProof(inputs: any): Promise<Uint8Array> {
     const serializedWitness = await generateWitness(this.circuit, inputs);

tooling/noir_js/test/node/e2e.test.ts

@@ -2,7 +2,7 @@ import { expect } from 'chai';
 import assert_lt_json from '../noir_compiled_examples/assert_lt/target/assert_lt.json' assert { type: 'json' };
 import { generateWitness } from '../../src/index.js';
 import { Noir } from '../../src/program.js';
-import { BarretenbergBackend as Backend } from '../backend/barretenberg.js';
+import { BarretenbergBackend as Backend } from '@noir-lang/backend_barretenberg';
 
 it('end-to-end proof creation and verification (outer)', async () => {
   // Noir.Js part
@@ -15,7 +15,7 @@ it('end-to-end proof creation and verification (outer)', async () => {
   // bb.js part
   //
   // Proof creation
-  const prover = await Backend.initialize(assert_lt_json);
+  const prover = new Backend(assert_lt_json);
   const proof = await prover.generateFinalProof(serializedWitness);
 
   // Proof verification
@@ -31,7 +31,7 @@ it('end-to-end proof creation and verification (outer) -- Program API', async ()
   };
 
   // Initialize backend
-  const backend = await Backend.initialize(assert_lt_json);
+  const backend = new Backend(assert_lt_json);
   // Initialize program
   const program = new Noir(assert_lt_json, backend);
   // Generate proof
@@ -53,7 +53,7 @@ it('end-to-end proof creation and verification (inner)', async () => {
   // bb.js part
   //
   // Proof creation
-  const prover = await Backend.initialize(assert_lt_json);
+  const prover = new Backend(assert_lt_json);
   const proof = await prover.generateIntermediateProof(serializedWitness);
 
   // Proof verification
@@ -82,12 +82,12 @@ it('[BUG] -- bb.js null function or function signature mismatch (different insta
   const serializedWitness = await generateWitness(assert_lt_json, inputs);
 
   // bb.js part
-  const prover = await Backend.initialize(assert_lt_json);
+  const prover = new Backend(assert_lt_json);
 
   const proof = await prover.generateFinalProof(serializedWitness);
 
   try {
-    const verifier = await Backend.initialize(assert_lt_json);
+    const verifier = new Backend(assert_lt_json);
     await verifier.verifyFinalProof(proof);
     expect.fail(
       'bb.js currently returns a bug when we try to verify a proof with a different Barretenberg instance that created it.',
@@ -117,7 +117,7 @@ it('[BUG] -- bb.js null function or function signature mismatch (outer-inner) ',
   //
   // Proof creation
   //
-  const prover = await Backend.initialize(assert_lt_json);
+  const prover = new Backend(assert_lt_json);
   // Create a proof using both proving systems, the majority of the time
   // one would only use outer proofs.
   const proofOuter = await prover.generateFinalProof(serializedWitness);

tooling/noir_js_backend_barretenberg/.eslintignore

@@ -0,0 +1 @@
+node_modules

tooling/noir_js_backend_barretenberg/.eslintrc.cjs

@@ -0,0 +1,3 @@
+module.exports = {
+  extends: ["../../.eslintrc.js"],
+};

tooling/noir_js_backend_barretenberg/.gitignore

@@ -0,0 +1,2 @@
+crs
+lib

tooling/noir_js_backend_barretenberg/package.json

@@ -0,0 +1,43 @@
+{
+  "name": "@noir-lang/backend_barretenberg",
+  "collaborators": [
+    "The Noir Team <team@noir-lang.org>"
+  ],
+  "version": "0.7.10",
+  "packageManager": "yarn@3.5.1",
+  "license": "(MIT OR Apache-2.0)",
+  "type": "module",
+  "source": "src/index.ts",
+  "main": "lib/cjs/index.cjs",
+  "module": "lib/esm/index.js",
+  "exports": {
+    "require": "./lib/cjs/index.cjs",
+    "default": "./lib/esm/index.js",
+    "types": "./lib/esm/index.d.ts"
+  },
+  "types": "lib/esm/index.d.ts",
+  "scripts": {
+    "dev": "tsc --watch",
+    "build": "yarn clean && tsc && tsc -p ./tsconfig.cjs.json && mv ./lib/cjs/index.js ./lib/cjs/index.cjs && mv ./lib/cjs/serialize.js ./lib/cjs/serialize.cjs && mv ./lib/cjs/base64_decode.js ./lib/cjs/base64_decode.cjs",
+    "clean": "rm -rf ./lib",
+    "prettier": "prettier 'src/**/*.ts'",
+    "prettier:fix": "prettier --write 'src/**/*.ts' 'test/**/*.ts'",
+    "lint": "NODE_NO_WARNINGS=1 eslint . --ext .ts --ignore-path ./.eslintignore  --max-warnings 0"
+  },
+  "dependencies": {
+    "@aztec/bb.js": "0.7.10",
+    "@noir-lang/types": "workspace:*",
+    "fflate": "^0.8.0"
+  },
+  "peerDependencies": {
+    "@noir-lang/backend_barretenberg": "workspace:*"
+  },
+  "devDependencies": {
+    "@types/node": "^20.6.2",
+    "@types/prettier": "^3",
+    "eslint": "^8.40.0",
+    "eslint-plugin-prettier": "^5.0.0",
+    "prettier": "3.0.3",
+    "typescript": "5.1.5"
+  }
+}

tooling/noir_js_backend_barretenberg/src/base64_decode.ts

@@ -0,0 +1,13 @@
+// Since this is a simple function, we can use feature detection to
+// see if we are in the nodeJs environment or the browser environment.
+export function base64Decode(input: string): Uint8Array {
+  if (typeof Buffer !== 'undefined') {
+    // Node.js environment
+    return Buffer.from(input, 'base64');
+  } else if (typeof atob === 'function') {
+    // Browser environment
+    return Uint8Array.from(atob(input), (c) => c.charCodeAt(0));
+  } else {
+    throw new Error('No implementation found for base64 decoding.');
+  }
+}

tooling/noir_js/test/backend/barretenberg.ts → tooling/noir_js_backend_barretenberg/src/index.ts

@@ -1,49 +1,38 @@
 /* eslint-disable  @typescript-eslint/no-explicit-any */
-// eslint-disable-next-line @typescript-eslint/ban-ts-comment
-// @ts-ignore
-import { Barretenberg, Crs, RawBuffer } from '@aztec/bb.js';
-import { acirToUint8Array } from '../../src/index.js';
-import { Backend } from '@noir-lang/types';
+import { acirToUint8Array } from './serialize.js';
+import { Backend, CompiledCircuit } from '@noir-lang/types';
 
 export class BarretenbergBackend implements Backend {
   // These type assertions are used so that we don't
   // have to initialize `api` and `acirComposer` in the constructor.
   // These are initialized asynchronously in the `init` function,
   // constructors cannot be asynchronous which is why we do this.
-  api = {} as Barretenberg;
-  acirComposer = {} as any;
-  acirUncompressedBytecode: Uint8Array;
+  private api: any;
+  private acirComposer: any;
+  private acirUncompressedBytecode: Uint8Array;
+  private numberOfThreads = 1;
 
-  private constructor(acirCircuit: { bytecode: string }) {
+  constructor(acirCircuit: CompiledCircuit, numberOfThreads = 1) {
     const acirBytecodeBase64 = acirCircuit.bytecode;
+    this.numberOfThreads = numberOfThreads;
     this.acirUncompressedBytecode = acirToUint8Array(acirBytecodeBase64);
   }
 
-  static async initialize(acirCircuit: { bytecode: string }): Promise<BarretenbergBackend> {
-    const backend = new BarretenbergBackend(acirCircuit);
-    await backend.init();
-    return backend;
-  }
-
-  private async init(): Promise<void> {
-    const numThreads = 4;
-
-    const { api, composer } = await this.initBarretenberg(numThreads, this.acirUncompressedBytecode);
-
-    this.api = api;
-    this.acirComposer = composer;
-  }
-
-  private async initBarretenberg(numThreads: number, acirUncompressedBytecode: Uint8Array) {
-    const api = await Barretenberg.new(numThreads);
-
-    const [_exact, _total, subgroupSize] = await api.acirGetCircuitSizes(acirUncompressedBytecode);
-    const crs = await Crs.new(subgroupSize + 1);
-    await api.commonInitSlabAllocator(subgroupSize);
-    await api.srsInitSrs(new RawBuffer(crs.getG1Data()), crs.numPoints, new RawBuffer(crs.getG2Data()));
-
-    const acirComposer = await api.acirNewAcirComposer(subgroupSize);
-    return { api: api, composer: acirComposer };
+  private async instantiate(): Promise<void> {
+    if (!this.api) {
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      //@ts-ignore
+      const { Barretenberg, RawBuffer, Crs } = await import('@aztec/bb.js');
+      const api = await Barretenberg.new(this.numberOfThreads);
+
+      const [_exact, _total, subgroupSize] = await api.acirGetCircuitSizes(this.acirUncompressedBytecode);
+      const crs = await Crs.new(subgroupSize + 1);
+      await api.commonInitSlabAllocator(subgroupSize);
+      await api.srsInitSrs(new RawBuffer(crs.getG1Data()), crs.numPoints, new RawBuffer(crs.getG2Data()));
+
+      this.acirComposer = await api.acirNewAcirComposer(subgroupSize);
+      this.api = api;
+    }
   }
 
   // Generate an outer proof. This is the proof for the circuit which will verify
@@ -73,6 +62,7 @@ export class BarretenbergBackend implements Backend {
   }
 
   async generateProof(decompressedWitness: Uint8Array, makeEasyToVerifyInCircuit: boolean): Promise<Uint8Array> {
+    await this.instantiate();
     const proof = await this.api.acirCreateProof(
       this.acirComposer,
       this.acirUncompressedBytecode,
@@ -100,6 +90,7 @@ export class BarretenbergBackend implements Backend {
     vkAsFields: string[];
     vkHash: string;
   }> {
+    await this.instantiate();
     const proofAsFields = await this.api.acirSerializeProofIntoFields(this.acirComposer, proof, numOfPublicInputs);
 
     // TODO: perhaps we should put this in the init function. Need to benchmark
@@ -128,11 +119,15 @@ export class BarretenbergBackend implements Backend {
   }
 
   async verifyProof(proof: Uint8Array, makeEasyToVerifyInCircuit: boolean): Promise<boolean> {
+    await this.instantiate();
     await this.api.acirInitVerificationKey(this.acirComposer);
     return await this.api.acirVerifyProof(this.acirComposer, proof, makeEasyToVerifyInCircuit);
   }
 
   async destroy(): Promise<void> {
+    if (!this.api) {
+      return;
+    }
     await this.api.destroy();
   }
 }

tooling/noir_js_backend_barretenberg/src/serialize.ts

@@ -0,0 +1,8 @@
+import { decompressSync as gunzip } from 'fflate';
+import { base64Decode } from './base64_decode.js';
+
+// Converts bytecode from a base64 string to a Uint8Array
+export function acirToUint8Array(base64EncodedBytecode): Uint8Array {
+  const compressedByteCode = base64Decode(base64EncodedBytecode);
+  return gunzip(compressedByteCode);
+}

tooling/noir_js_backend_barretenberg/tsconfig.cjs.json

@@ -0,0 +1,7 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "module": "CommonJS",
+    "outDir": "./lib/cjs"
+  },
+}

tooling/noir_js_backend_barretenberg/tsconfig.json

@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+    "target": "esnext",
+    "declaration": true,
+    "emitDeclarationOnly": false,
+    "module": "ESNext",
+    "moduleResolution": "NodeNext",
+    "outDir": "./lib/esm",
+    "esModuleInterop": true,
+    "resolveJsonModule": true,
+    "strict": true,
+    "noImplicitAny": false,
+  },
+  "include": ["src/**/*.ts"],
+  "exclude": ["node_modules"]
+}

yarn.lock

@@ -29,6 +29,20 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@aztec/bb.js@npm:0.7.10":
+  version: 0.7.10
+  resolution: "@aztec/bb.js@npm:0.7.10"
+  dependencies:
+    comlink: ^4.4.1
+    commander: ^10.0.1
+    debug: ^4.3.4
+    tslib: ^2.4.0
+  bin:
+    bb.js: dest/node/main.js
+  checksum: 0410278e6ec2a6ecdcbaa58633b181ec1d91e1c267c76e7e587fb69c8f2fd394e79f65bd96cfcdb2a2b20fe5abeb86ababd45bd6364ba07555fc0643bf0e4307
+  languageName: node
+  linkType: hard
+
 "@aztec/bb.js@npm:0.7.2":
   version: 0.7.2
   resolution: "@aztec/bb.js@npm:0.7.2"
@@ -440,6 +454,24 @@ __metadata:
   languageName: unknown
   linkType: soft
 
+"@noir-lang/backend_barretenberg@workspace:tooling/noir_js_backend_barretenberg":
+  version: 0.0.0-use.local
+  resolution: "@noir-lang/backend_barretenberg@workspace:tooling/noir_js_backend_barretenberg"
+  dependencies:
+    "@aztec/bb.js": 0.7.10
+    "@noir-lang/types": "workspace:*"
+    "@types/node": ^20.6.2
+    "@types/prettier": ^3
+    eslint: ^8.40.0
+    eslint-plugin-prettier: ^5.0.0
+    fflate: ^0.8.0
+    prettier: 3.0.3
+    typescript: 5.1.5
+  peerDependencies:
+    "@noir-lang/backend_barretenberg": "workspace:*"
+  languageName: unknown
+  linkType: soft
+
 "@noir-lang/noir_js@workspace:*, @noir-lang/noir_js@workspace:tooling/noir_js":
   version: 0.0.0-use.local
   resolution: "@noir-lang/noir_js@workspace:tooling/noir_js"
@@ -7549,6 +7581,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"typescript@npm:5.1.5":
+  version: 5.1.5
+  resolution: "typescript@npm:5.1.5"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: 0eef8699e05ae767096924dbed633c340b4d36e953bb8ed87fb12e9dd9dcea5055ceac7182c614a556dbd346a8a82df799d330e1e286ae66e17c84e1710f6a6f
+  languageName: node
+  linkType: hard
+
 "typescript@npm:^5.0.4, typescript@npm:^5.2.2":
   version: 5.2.2
   resolution: "typescript@npm:5.2.2"
@@ -7569,6 +7611,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"typescript@patch:typescript@5.1.5#~builtin<compat/typescript>":
+  version: 5.1.5
+  resolution: "typescript@patch:typescript@npm%3A5.1.5#~builtin<compat/typescript>::version=5.1.5&hash=5da071"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: 12ff5d14888805f24479e54bc8a3f83647107a6345f6c29dffcd429fb345be55f584a37e262cca58a0105203e41d4cb4e31b1b9096c9abeca0e2ace8eb00935e
+  languageName: node
+  linkType: hard
+
 "typescript@patch:typescript@^5.0.4#~builtin<compat/typescript>, typescript@patch:typescript@^5.2.2#~builtin<compat/typescript>":
   version: 5.2.2
   resolution: "typescript@patch:typescript@npm%3A5.2.2#~builtin<compat/typescript>::version=5.2.2&hash=f3b441"