feat: make smock work with the EDR-powered version of Hardhat (#195)

.github/workflows/canary.yml

@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
-          node-version: "14.x"
+          node-version: "18.x"
           registry-url: "https://registry.npmjs.org"
       - uses: docker://pandoc/core:2.6
         with:

.github/workflows/lint.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Install node
         uses: actions/setup-node@v1
         with:
-          node-version: "14.x"
+          node-version: "18.x"
 
       - name: Install dependencies
         run: yarn --frozen-lockfile

.github/workflows/release.yml

@@ -44,7 +44,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
-          node-version: "14.x"
+          node-version: "18.x"
           registry-url: "https://registry.npmjs.org"
       - run: yarn
       - run: yarn build

.github/workflows/tests.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Install node
         uses: actions/setup-node@v1
         with:
-          node-version: "14.x"
+          node-version: "18.x"
 
       - name: Install dependencies
         run: yarn --frozen-lockfile

README.md

@@ -53,6 +53,10 @@ You can install Smock via npm or yarn:
 npm install @defi-wonderland/smock
 ```
 
+> **Note**: Starting from v2.4.0, Smock is only compatible with
+> Hardhat v2.21.0 or later. If you are using an older version of Hardhat,
+> please install Smock v2.3.5.
+
 ## Basic Usage
 
 Smock is dead simple to use. Here's a basic example of how you might use

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@defi-wonderland/smock",
-  "version": "2.3.5",
+  "version": "2.4.0",
   "description": "The Solidity mocking library",
   "keywords": [
     "ethereum",
@@ -52,17 +52,8 @@
     "*.sol": "cross-env solhint --fix 'contracts/**/*.sol' 'interfaces/**/*.sol'",
     "package.json": "sort-package-json"
   },
-  "resolutions": {
-    "@ethereumjs/block": "3.2.1",
-    "@ethereumjs/blockchain": "5.2.1",
-    "@ethereumjs/common": "2.2.0",
-    "@ethereumjs/tx": "3.1.4",
-    "@ethereumjs/vm": "5.3.1"
-  },
   "dependencies": {
-    "@nomicfoundation/ethereumjs-evm": "^1.0.0-rc.3",
-    "@nomicfoundation/ethereumjs-util": "^8.0.0-rc.3",
-    "@nomicfoundation/ethereumjs-vm": "^6.0.0-rc.3",
+    "@nomicfoundation/ethereumjs-util": "^9.0.4",
     "diff": "^5.0.0",
     "lodash.isequal": "^4.5.0",
     "lodash.isequalwith": "^4.4.0",
@@ -84,15 +75,15 @@
     "@types/lodash.isequal": "^4.5.5",
     "@types/lodash.isequalwith": "^4.4.6",
     "@types/mocha": "8.2.2",
-    "@types/node": "15.12.2",
+    "@types/node": "18.19.21",
     "@types/readable-stream": "^2.3.13",
     "@types/semver": "^7.3.8",
     "chai": "4.3.4",
     "chai-as-promised": "7.1.1",
     "cross-env": "7.0.3",
     "ethereum-waffle": "3.4.0",
     "ethers": "5.4.1",
-    "hardhat": "2.11.0",
+    "hardhat": "^2.21.0",
     "hardhat-preprocessor": "0.1.4",
     "husky": "6.0.0",
     "inquirer": "8.1.0",
@@ -109,14 +100,14 @@
     "ts-node": "10.0.0",
     "tsconfig-paths": "^3.9.0",
     "typechain": "5.1.1",
-    "typescript": "4.5.2"
+    "typescript": "4.9.5"
   },
   "peerDependencies": {
     "@ethersproject/abi": "^5",
     "@ethersproject/abstract-provider": "^5",
     "@ethersproject/abstract-signer": "^5",
     "@nomiclabs/hardhat-ethers": "^2",
     "ethers": "^5",
-    "hardhat": "^2"
+    "hardhat": "^2.21.0"
   }
 }

src/factories/smock-contract.ts

@@ -1,33 +1,36 @@
-import { Message } from '@nomicfoundation/ethereumjs-evm/dist/message';
+import { Address } from '@nomicfoundation/ethereumjs-util';
 import { FactoryOptions } from '@nomiclabs/hardhat-ethers/types';
+import assert from 'assert';
 import { BaseContract, BigNumber, ContractFactory, ethers } from 'ethers';
 import { Interface } from 'ethers/lib/utils';
 import { ethers as hardhatEthers } from 'hardhat';
 import { Observable } from 'rxjs';
-import { distinct, filter, map, share, withLatestFrom } from 'rxjs/operators';
+import { filter, map, share } from 'rxjs/operators';
 import { EditableStorageLogic as EditableStorage } from '../logic/editable-storage-logic';
 import { ProgrammableFunctionLogic, SafeProgrammableContract } from '../logic/programmable-function-logic';
 import { ReadableStorageLogic as ReadableStorage } from '../logic/readable-storage-logic';
 import { ObservableVM } from '../observable-vm';
 import { Sandbox } from '../sandbox';
-import { ContractCall, FakeContract, MockContractFactory, ProgrammableContractFunction, ProgrammedReturnValue } from '../types';
+import { ContractCall, FakeContract, Message, MockContractFactory, ProgrammableContractFunction, ProgrammedReturnValue } from '../types';
 import { convertPojoToStruct, fromFancyAddress, impersonate, isPojo, toFancyAddress, toHexString } from '../utils';
 import { getStorageLayout } from '../utils/storage';
 
 export async function createFakeContract<Contract extends BaseContract>(
   vm: ObservableVM,
   address: string,
   contractInterface: ethers.utils.Interface,
-  provider: ethers.providers.Provider
+  provider: ethers.providers.Provider,
+  addFunctionToMap: (address: string, sighash: string | null, functionLogic: ProgrammableFunctionLogic) => void
 ): Promise<FakeContract<Contract>> {
   const fake = (await initContract(vm, address, contractInterface, provider)) as unknown as FakeContract<Contract>;
   const contractFunctions = getContractFunctionsNameAndSighash(contractInterface, Object.keys(fake.functions));
 
   // attach to every contract function, all the programmable and watchable logic
   contractFunctions.forEach(([sighash, name]) => {
-    const { encoder, calls$, results$ } = getFunctionEventData(vm, contractInterface, fake.address, sighash);
-    const functionLogic = new SafeProgrammableContract(name, calls$, results$, encoder);
+    const { encoder, calls$ } = getFunctionEventData(vm, contractInterface, fake.address, sighash);
+    const functionLogic = new SafeProgrammableContract(contractInterface, sighash, name, calls$, encoder);
     fillProgrammableContractFunction(fake[name], functionLogic);
+    addFunctionToMap(fake.address, sighash, functionLogic);
   });
 
   return fake;
@@ -36,7 +39,8 @@ export async function createFakeContract<Contract extends BaseContract>(
 function mockifyContractFactory<T extends ContractFactory>(
   vm: ObservableVM,
   contractName: string,
-  factory: MockContractFactory<T>
+  factory: MockContractFactory<T>,
+  addFunctionToMap: (address: string, sighash: string | null, functionLogic: ProgrammableFunctionLogic) => void
 ): MockContractFactory<T> {
   const realDeploy = factory.deploy;
   factory.deploy = async (...args: Parameters<T['deploy']>) => {
@@ -45,9 +49,10 @@ function mockifyContractFactory<T extends ContractFactory>(
 
     // attach to every contract function, all the programmable and watchable logic
     contractFunctions.forEach(([sighash, name]) => {
-      const { encoder, calls$, results$ } = getFunctionEventData(vm, mock.interface, mock.address, sighash);
-      const functionLogic = new ProgrammableFunctionLogic(name, calls$, results$, encoder);
+      const { encoder, calls$ } = getFunctionEventData(vm, mock.interface, mock.address, sighash);
+      const functionLogic = new ProgrammableFunctionLogic(mock.interface, sighash, name, calls$, encoder);
       fillProgrammableContractFunction(mock[name], functionLogic);
+      addFunctionToMap(mock.address, sighash, functionLogic);
     });
 
     // attach to every internal variable, all the editable logic
@@ -66,7 +71,7 @@ function mockifyContractFactory<T extends ContractFactory>(
   const realConnect = factory.connect;
   factory.connect = (...args: Parameters<T['connect']>): MockContractFactory<T> => {
     const newFactory = realConnect.apply(factory, args) as MockContractFactory<T>;
-    return mockifyContractFactory(vm, contractName, newFactory);
+    return mockifyContractFactory(vm, contractName, newFactory, addFunctionToMap);
   };
 
   return factory;
@@ -75,10 +80,11 @@ function mockifyContractFactory<T extends ContractFactory>(
 export async function createMockContractFactory<T extends ContractFactory>(
   vm: ObservableVM,
   contractName: string,
+  addFunctionToMap: (address: string, sighash: string | null, functionLogic: ProgrammableFunctionLogic) => void,
   signerOrOptions?: ethers.Signer | FactoryOptions
 ): Promise<MockContractFactory<T>> {
   const factory = (await hardhatEthers.getContractFactory(contractName, signerOrOptions)) as unknown as MockContractFactory<T>;
-  return mockifyContractFactory(vm, contractName, factory);
+  return mockifyContractFactory(vm, contractName, factory, addFunctionToMap);
 }
 
 async function initContract(
@@ -104,14 +110,8 @@ function getFunctionEventData(vm: ObservableVM, contractInterface: ethers.utils.
   const encoder = getFunctionEncoder(contractInterface, sighash);
   // Filter only the calls that correspond to this function, from vm beforeMessages
   const calls$ = parseAndFilterBeforeMessages(vm.getBeforeMessages(), contractInterface, contractAddress, sighash);
-  // Get every result that comes right after a call to this function
-  const results$ = vm.getAfterMessages().pipe(
-    withLatestFrom(calls$),
-    distinct(([, call]) => call),
-    map(([answer]) => answer)
-  );
 
-  return { encoder, calls$, results$ };
+  return { encoder, calls$ };
 }
 
 function getFunctionEncoder(contractInterface: ethers.utils.Interface, sighash: string | null): (values?: ProgrammedReturnValue) => string {
@@ -157,7 +157,7 @@ function parseAndFilterBeforeMessages(
     }),
     // Ensure the message is directed to this contract
     filter((message) => {
-      const target = message.delegatecall ? message.codeAddress : message.to;
+      const target = isDelegated(message) ? message.codeAddress : message.to;
       return target?.toString().toLowerCase() === contractAddress.toLowerCase();
     }),
     map((message) => parseMessage(message, contractInterface, sighash)),
@@ -206,12 +206,28 @@ function parseMessage(message: Message, contractInterface: Interface, sighash: s
     args: sighash === null ? toHexString(message.data) : getMessageArgs(message.data, contractInterface, sighash),
     nonce: Sandbox.getNextNonce(),
     value: BigNumber.from(message.value.toString()),
-    target: fromFancyAddress(message.delegatecall ? message.codeAddress : message.to!),
-    delegatedFrom: message.delegatecall ? fromFancyAddress(message.to!) : undefined,
+    target: targetAddres(message),
+    delegatedFrom: isDelegated(message) ? fromFancyAddress(message.to!) : undefined,
   };
 }
 
-function getMessageArgs(messageData: Buffer, contractInterface: Interface, sighash: string): unknown[] {
+function targetAddres(message: Message): string {
+  assert(message.to !== undefined, 'Message should have a target address');
+
+  if (message.codeAddress !== undefined && message.to! !== message.caller && message.caller !== message.codeAddress) {
+    return fromFancyAddress(message.codeAddress);
+  } else {
+    return fromFancyAddress(message.to!);
+  }
+}
+
+function isDelegated(message: Message): boolean {
+  assert(message.to !== undefined, 'Message should have a target address');
+
+  return message.codeAddress !== undefined && message.to !== message.caller && message.caller !== message.codeAddress;
+}
+
+export function getMessageArgs(messageData: Buffer, contractInterface: Interface, sighash: string): unknown[] {
   try {
     return contractInterface.decodeFunctionData(contractInterface.getFunction(sighash).format(), toHexString(messageData)) as unknown[];
   } catch (err) {

src/logic/programmable-function-logic.ts

@@ -1,11 +1,12 @@
-import { EVMResult } from '@nomicfoundation/ethereumjs-evm/dist/evm';
-import { EvmError } from '@nomicfoundation/ethereumjs-evm/dist/exceptions';
+import { Address } from '@nomicfoundation/ethereumjs-util';
 import { ethers } from 'ethers';
+import { Interface } from 'ethers/lib/utils';
 import { findLast } from 'lodash';
-import { Observable, withLatestFrom } from 'rxjs';
+import { Observable } from 'rxjs';
+import { getMessageArgs } from '../factories/smock-contract';
 import { ContractCall, ProgrammedReturnValue, WhenCalledWithChain } from '../index';
 import { WatchableFunctionLogic } from '../logic/watchable-function-logic';
-import { fromHexString } from '../utils';
+import { fromHexString, toHexString } from '../utils';
 
 const EMPTY_ANSWER: Buffer = fromHexString('0x' + '00'.repeat(2048));
 
@@ -26,20 +27,15 @@ export class ProgrammableFunctionLogic extends WatchableFunctionLogic {
   protected answerByArgs: { answer: ProgrammedAnswer; args: unknown[] }[] = [];
 
   constructor(
+    private contractInterface: Interface,
+    private sighash: string | null,
     name: string,
     calls$: Observable<ContractCall>,
-    results$: Observable<EVMResult>,
     encoder: (values?: ProgrammedReturnValue) => string
   ) {
     super(name, calls$);
 
     this.encoder = encoder;
-
-    // Intercept every result of this programmableFunctionLogic
-    results$.pipe(withLatestFrom(calls$)).subscribe(async ([result, call]) => {
-      // Modify it with the corresponding answer
-      await this.modifyAnswer(result, call);
-    });
   }
 
   returns(value?: ProgrammedReturnValue): void {
@@ -82,40 +78,42 @@ export class ProgrammableFunctionLogic extends WatchableFunctionLogic {
     this.answerByArgs = [];
   }
 
-  private async modifyAnswer(result: EVMResult, call: ContractCall): Promise<void> {
-    const answer = this.getCallAnswer(call);
+  async getEncodedCallAnswer(data: Buffer): Promise<[result: Buffer, shouldRevert: boolean] | undefined> {
+    this.callCount++;
 
+    const answer = this.getCallAnswer(data);
     if (answer) {
-      result.execResult.gas = BigInt(0);
       if (answer.shouldRevert) {
-        result.execResult.exceptionError = new EvmError('smock revert' as any);
-        result.execResult.returnValue = this.encodeRevertReason(answer.value);
-      } else {
-        result.execResult.exceptionError = undefined;
-        result.execResult.returnValue = await this.encodeValue(answer.value, call);
+        return [this.encodeRevertReason(answer.value), answer.shouldRevert];
       }
+
+      return [await this.encodeValue(answer.value, data), answer.shouldRevert];
     }
   }
 
-  private getCallAnswer(call: ContractCall): ProgrammedAnswer | undefined {
+  private getCallAnswer(data: Buffer): ProgrammedAnswer | undefined {
+    const args = this.sighash === null ? toHexString(data) : getMessageArgs(data, this.contractInterface, this.sighash);
+
     let answer: ProgrammedAnswer | undefined;
 
     // if there is an answer for this call index, return it
     answer = this.answerByIndex[this.getCallCount() - 1];
     if (answer) return answer;
 
     // if there is an answer for this call arguments, return it
-    answer = findLast(this.answerByArgs, (option) => this.isDeepEqual(option.args, call.args))?.answer;
+    answer = findLast(this.answerByArgs, (option) => this.isDeepEqual(option.args, args))?.answer;
     if (answer) return answer;
 
     // return the default answer
     return this.defaultAnswer;
   }
 
-  private async encodeValue(value: ProgrammedReturnValue, call: ContractCall): Promise<Buffer> {
+  private async encodeValue(value: ProgrammedReturnValue, data: Buffer): Promise<Buffer> {
     if (value === undefined) return EMPTY_ANSWER;
 
-    let toEncode = typeof value === 'function' ? await value(call.args) : value;
+    const args = this.sighash === null ? toHexString(data) : getMessageArgs(data, this.contractInterface, this.sighash);
+
+    let toEncode = typeof value === 'function' ? await value(args) : value;
 
     let encodedReturnValue: string = '0x';
     try {

src/logic/readable-storage-logic.ts

@@ -1,3 +1,4 @@
+import { stripZeros } from 'ethers/lib/utils';
 import { SmockVMManager } from '../types';
 import { fromHexString, remove0x, toFancyAddress, toHexString } from '../utils';
 import {
@@ -31,7 +32,11 @@ export class ReadableStorageLogic {
       slots.map(async (slotKeyPair) => ({
         ...slotKeyPair,
         value: remove0x(
-          toHexString(await this.vmManager.getContractStorage(toFancyAddress(this.contractAddress), fromHexString(slotKeyPair.key)))
+          toHexString(
+            Buffer.from(
+              stripZeros(await this.vmManager.getContractStorage(toFancyAddress(this.contractAddress), fromHexString(slotKeyPair.key)))
+            )
+          )
         ),
       }))
     );

src/logic/watchable-function-logic.ts

@@ -8,6 +8,7 @@ import { convertStructToPojo, getObjectAndStruct, humanizeTimes } from '../utils
 export class WatchableFunctionLogic {
   protected name: string;
   protected callHistory: ContractCall[] = [];
+  protected callCount = 0;
 
   constructor(name: string, calls$: Observable<ContractCall>) {
     this.name = name;
@@ -107,7 +108,7 @@ export class WatchableFunctionLogic {
   }
 
   getCallCount(): number {
-    return this.callHistory.length;
+    return this.callCount;
   }
 
   getCalled(): boolean {
@@ -127,6 +128,7 @@ export class WatchableFunctionLogic {
   }
 
   protected reset() {
+    this.callCount = 0;
     this.callHistory = [];
   }