test(evm-e2e): add E2E test using the Nibiru Oracle's ChainLink impl

CHANGELOG.md

@@ -72,6 +72,7 @@ the `@nibiruchain/solidity` package.
 - [#2154](https://github.com/NibiruChain/nibiru/pull/2154) - fix(evm):
 JSON encoding for the `EIP55Addr` struct was not following the Go conventions and
 needed to include double quotes around the hexadecimal string.
+- [#2156](https://github.com/NibiruChain/nibiru/pull/2156) - test(evm-e2e): add E2E test using the Nibiru Oracle's ChainLink impl
 
 #### Nibiru EVM | Before Audit 2 - 2024-12-06
 

evm-e2e/contracts/NibiruOracleChainLinkLike.sol

@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: MIT
+pragma solidity >=0.8.19;
+
+import '@nibiruchain/solidity/contracts/IOracle.sol';
+
+/// @title NibiruOracleChainLinkLike
+/// @notice This contract serves as a ChainLink-like data feed that sources its
+/// "answer" value from the Nibiru Oracle system. The Nibiru Oracle gives price
+/// data with 18 decimals universally, and that 18-decimal answer is scaled to
+/// have the number of decimals specified by "decimals()". This is set at the
+/// time of deployment.
+///   _   _  _____  ____  _____  _____   _    _
+///  | \ | ||_   _||  _ \|_   _||  __ \ | |  | |
+///  |  \| |  | |  | |_) | | |  | |__) || |  | |
+///  | . ` |  | |  |  _ <  | |  |  _  / | |  | |
+///  | |\  | _| |_ | |_) |_| |_ | | \ \ | |__| |
+///  |_| \_||_____||____/|_____||_|  \_\ \____/
+///
+contract NibiruOracleChainLinkLike is ChainLinkAggregatorV3Interface {
+  string public pair;
+  uint8 public _decimals;
+
+  constructor(string memory _pair, uint8 _dec) {
+    require(_dec <= 18, 'Decimals cannot exceed 18');
+    require(bytes(_pair).length > 0, 'Pair string cannot be empty');
+    pair = _pair;
+    _decimals = _dec;
+  }
+
+  function decimals() external view override returns (uint8) {
+    return _decimals;
+  }
+
+  /// @notice Returns a human-readable description of the oracle and its data
+  /// feed identifier (pair) in the Nibiru Oracle system
+  function description() external view override returns (string memory) {
+    return string.concat('Nibiru Oracle ChainLink-like price feed for ', pair);
+  }
+
+  /// @notice Oracle version number. Hardcoded to 1.
+  function version() external pure override returns (uint256) {
+    return 1;
+  }
+
+  /// @notice Returns the latest data from the Nibiru Oracle.
+  /// @return roundId The block number when the answer was published onchain.
+  /// @return answer Data feed result scaled to the precision specified by
+  ///   "decimals()"
+  /// @return startedAt UNIX timestamp in seconds when "answer" was published.
+  /// @return updatedAt UNIX timestamp in seconds when "answer" was published.
+  /// @return answeredInRound The ID of the round where the answer was computed.
+  ///   Since the Nibiru Oracle does not have ChainLink's system of voting
+  ///   rounds, this argument is a meaningless, arbitrary constant.
+  function latestRoundData()
+    public
+    view
+    override
+    returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
+  {
+    (
+      uint80 _roundId,
+      int256 answer18Dec,
+      uint256 _startedAt,
+      uint256 _updatedAt,
+      uint80 _answeredInRound
+    ) = NIBIRU_ORACLE.chainLinkLatestRoundData(pair);
+    answer = scaleAnswerToDecimals(answer18Dec);
+    return (_roundId, answer, _startedAt, _updatedAt, _answeredInRound);
+  }
+
+  /// @notice Returns the latest data from the Nibiru Oracle. Historical round
+  /// retrieval is not supported. This method is a duplicate of
+  /// "latestRoundData".
+  /// @return roundId The block number when the answer was published onchain.
+  /// @return answer Data feed result scaled to the precision specified by
+  ///   "decimals()"
+  /// @return startedAt UNIX timestamp in seconds when "answer" was published.
+  /// @return updatedAt UNIX timestamp in seconds when "answer" was published.
+  /// @return answeredInRound The ID of the round where the answer was computed.
+  ///   Since the Nibiru Oracle does not have ChainLink's system of voting
+  ///   rounds, this argument is a meaningless, arbitrary constant.
+  function getRoundData(
+    uint80
+  )
+    external
+    view
+    returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
+  {
+    return latestRoundData();
+  }
+
+  function scaleAnswerToDecimals(int256 answer18Dec) internal view returns (int256 answer) {
+    // Default answers are in 18 decimals.
+    // Scale down to the decimals specified in the constructor.
+    uint8 pow10 = 18 - _decimals;
+    return answer18Dec / int256(10 ** pow10);
+  }
+}

evm-e2e/test/nibiru_oracle.test.ts

@@ -0,0 +1,40 @@
+import { expect, test } from '@jest/globals';
+import { toBigInt } from 'ethers';
+import { deployContractNibiruOracleChainLinkLike } from './utils';
+
+test('NibiruOracleChainLinkLike implements ChainLink AggregatorV3Interface', async () => {
+  const { oraclePair, contract } = await deployContractNibiruOracleChainLinkLike();
+
+  const oracleAddr = await contract.getAddress();
+  expect(oracleAddr).not.toBeFalsy();
+
+  const decimals = await contract.decimals();
+  expect(decimals).toEqual(BigInt(8));
+
+  const description = await contract.description();
+  expect(description).toEqual(`Nibiru Oracle ChainLink-like price feed for ${oraclePair}`);
+
+  const version = await contract.version();
+  expect(version).toEqual(1n);
+
+  // latestRoundData
+  const genesisEthUsdPrice = 2000n;
+  {
+    const { roundId, answer, startedAt, updatedAt, answeredInRound } = await contract.latestRoundData();
+    expect(roundId).toEqual(0n); // price is from genesis block
+    expect(startedAt).toBeGreaterThan(1n);
+    expect(updatedAt).toBeGreaterThan(1n);
+    expect(answeredInRound).toEqual(420n);
+    expect(answer).toEqual(genesisEthUsdPrice * toBigInt(1e8));
+  }
+
+  // getRoundData
+  {
+    const { roundId, answer, startedAt, updatedAt, answeredInRound } = await contract.getRoundData(0n);
+    expect(roundId).toEqual(0n); // price is from genesis block
+    expect(startedAt).toBeGreaterThan(1n);
+    expect(updatedAt).toBeGreaterThan(1n);
+    expect(answeredInRound).toEqual(420n);
+    expect(answer).toEqual(genesisEthUsdPrice * toBigInt(1e8));
+  }
+});

evm-e2e/test/utils.ts

@@ -1,11 +1,13 @@
 import { account } from './setup';
-import { parseEther, toBigInt, TransactionRequest, Wallet } from 'ethers';
+import { ContractTransactionResponse, parseEther, toBigInt, TransactionRequest, Wallet } from 'ethers';
 import {
   InifiniteLoopGas__factory,
   SendNibi__factory,
   TestERC20__factory,
   EventsEmitter__factory,
   TransactionReverter__factory,
+  NibiruOracleChainLinkLike__factory,
+  NibiruOracleChainLinkLike,
 } from '../types';
 
 export const alice = Wallet.createRandom();
@@ -66,3 +68,16 @@ export const sendTestNibi = async () => {
   console.log(txResponse);
   return txResponse;
 };
+
+export const deployContractNibiruOracleChainLinkLike = async (): Promise<{
+  oraclePair: string;
+  contract: NibiruOracleChainLinkLike & {
+    deploymentTransaction(): ContractTransactionResponse;
+  };
+}> => {
+  const oraclePair = 'ueth:uuusd';
+  const factory = new NibiruOracleChainLinkLike__factory(account);
+  const contract = await factory.deploy(oraclePair, toBigInt(8));
+  await contract.waitForDeployment();
+  return { oraclePair, contract };
+};

justfile

@@ -21,7 +21,7 @@ clean-cache:
   go clean -cache -testcache -modcache
 
 # Generate protobuf-based types in Golang
-proto-gen: 
+gen-proto: 
   #!/usr/bin/env bash
   make proto-gen
 
@@ -42,8 +42,6 @@ gen-embeds:
   go run "gen-abi/main.go"
   log_success "Saved ABI JSON files to $embeds_dir/abi for npm publishing"
 
-alias gen-proto := proto-gen
-
 # Generate the Nibiru Token Registry files
 gen-token-registry:
   go run token-registry/main/main.go
@@ -121,6 +119,10 @@ test-chaosnet:
   which_ok nibid
   bash contrib/scripts/chaosnet.sh 
 
+# Alias for "gen-proto"
+proto-gen:
+  just gen-proto
+
 # Stops any `nibid` processes, even if they're running in the background.
 stop: 
   kill $(pgrep -x nibid) || true