revert simulation

src/error.ts

@@ -1,6 +1,18 @@
+/* eslint-disable @typescript-eslint/ban-ts-comment */
+import { ViemClient } from "./types";
+// @ts-ignore
+import { abi as obAbi } from "../test/abis/OrderBook.json";
+// @ts-ignore
+import { abi as rp4Abi } from "../test/abis/RouteProcessor4.json";
+// @ts-ignore
+import { abi as arbRp4Abi } from "../test/abis/RouteProcessorOrderBookV4ArbOrderTaker.json";
+// @ts-ignore
+import { abi as genericArbAbi } from "../test/abis/GenericPoolOrderBookV4ArbOrderTaker.json";
 import {
+    isHex,
     BaseError,
     RpcRequestError,
+    decodeErrorResult,
     ExecutionRevertedError,
     InsufficientFundsError,
     // InvalidInputRpcError,
@@ -16,6 +28,31 @@ export enum ErrorSeverity {
     HIGH = "HIGH",
 }
 
+/**
+ * Specifies a decoded contract error
+ */
+export type DecodedError = {
+    name: string;
+    args: string[];
+};
+
+/**
+ * Raw error returned from rpc call
+ */
+export type RawError = {
+    code: number;
+    message: string;
+    data?: string;
+};
+
+/**
+ * Represents a revert error that happened for a transaction
+ */
+export type TxRevertError = {
+    raw: RawError;
+    decoded?: DecodedError;
+};
+
 /**
  * Get error with snapshot
  */
@@ -24,7 +61,24 @@ export function errorSnapshot(header: string, err: any): string {
     if (err instanceof BaseError) {
         if (err.shortMessage) message.push("Reason: " + err.shortMessage);
         if (err.name) message.push("Error: " + err.name);
-        if (err.details) message.push("Details: " + err.details);
+        if (err.details) {
+            message.push("Details: " + err.details);
+            if (
+                err.name.includes("unknown reason") ||
+                err.details.includes("unknown reason") ||
+                err.shortMessage.includes("unknown reason")
+            ) {
+                const { raw, decoded } = parseRevertError(err);
+                if (decoded) {
+                    message.push("Error Name: " + decoded.name);
+                    if (decoded.args.length) {
+                        message.push("Error Args: " + JSON.stringify(decoded.args));
+                    }
+                } else {
+                    if (raw.data) message.push("Error Raw Data: " + raw.data);
+                }
+            }
+        }
     } else if (err instanceof Error) {
         if ("reason" in err) message.push("Reason: " + err.reason);
         else message.push("Reason: " + err.message);
@@ -58,3 +112,104 @@ export function containsNodeError(err: BaseError): boolean {
         return false;
     }
 }
+
+/**
+ * Handles a reverted transaction by simulating it and returning the revert error
+ */
+export async function handleRevert(
+    viemClient: ViemClient,
+    hash: `0x${string}`,
+): Promise<{ err: any; nodeError: boolean } | undefined> {
+    try {
+        const tx = await viemClient.getTransaction({ hash });
+        await viemClient.call({
+            account: tx.from,
+            to: tx.to,
+            data: tx.input,
+            gas: tx.gas,
+            gasPrice: tx.gasPrice,
+            blockNumber: tx.blockNumber,
+        });
+        return undefined;
+    } catch (err) {
+        if (err instanceof BaseError) {
+            const { raw, decoded } = parseRevertError(err);
+            if (decoded || raw.data) return { err, nodeError: true };
+        }
+        return { err, nodeError: false };
+    }
+}
+
+/**
+ * Parses a revert error to TxRevertError type
+ */
+export function parseRevertError(error: BaseError): TxRevertError {
+    if ("cause" in error) {
+        return parseRevertError(error.cause as any);
+    } else {
+        let decoded: DecodedError | undefined;
+        const raw: RawError = {
+            code: (error as any).code ?? NaN,
+            message: error.message,
+            data: (error as any).data ?? undefined,
+        };
+        if ("data" in error && isHex(error.data)) {
+            decoded = tryDecodeError(error.data);
+        }
+        return { raw, decoded };
+    }
+}
+
+/**
+ * Tries to decode an error data with known contract error selectors
+ */
+export function tryDecodeError(data: `0x${string}`): DecodedError | undefined {
+    const handleArgs = (args: readonly unknown[]): string[] => {
+        return (
+            args?.map((arg) => {
+                if (typeof arg === "string") {
+                    return arg;
+                } else {
+                    try {
+                        return arg!.toString();
+                    } catch (error) {
+                        return "";
+                    }
+                }
+            }) ?? []
+        );
+    };
+    try {
+        const result = decodeErrorResult({ data, abi: rp4Abi });
+        return {
+            name: result.errorName,
+            args: handleArgs(result.args ?? []),
+        };
+    } catch {
+        try {
+            const result = decodeErrorResult({ data, abi: obAbi });
+            return {
+                name: result.errorName,
+                args: handleArgs(result.args ?? []),
+            };
+        } catch {
+            try {
+                const result = decodeErrorResult({ data, abi: arbRp4Abi });
+                return {
+                    name: result.errorName,
+                    args: handleArgs(result.args ?? []),
+                };
+            } catch {
+                try {
+                    const result = decodeErrorResult({ data, abi: genericArbAbi });
+                    return {
+                        name: result.errorName,
+                        args: handleArgs(result.args ?? []),
+                    };
+                } catch {
+                    return undefined;
+                }
+            }
+        }
+    }
+}

src/modes/interOrderbook.ts

@@ -109,6 +109,15 @@ export async function dryrun({
     try {
         blockNumber = Number(await viemClient.getBlockNumber());
         spanAttributes["blockNumber"] = blockNumber;
+        try {
+            gasPrice = ethers.BigNumber.from(await viemClient.getGasPrice())
+                .mul(config.gasPriceMultiplier)
+                .div("100")
+                .toBigInt();
+            rawtx.gasPrice = gasPrice;
+        } catch {
+            /**/
+        }
         gasLimit = ethers.BigNumber.from(await signer.estimateGas(rawtx))
             .mul(config.gasLimitMultiplier)
             .div(100);

src/modes/intraOrderbook.ts

@@ -106,6 +106,15 @@ export async function dryrun({
     try {
         blockNumber = Number(await viemClient.getBlockNumber());
         spanAttributes["blockNumber"] = blockNumber;
+        try {
+            gasPrice = ethers.BigNumber.from(await viemClient.getGasPrice())
+                .mul(config.gasPriceMultiplier)
+                .div("100")
+                .toBigInt();
+            rawtx.gasPrice = gasPrice;
+        } catch {
+            /**/
+        }
         gasLimit = ethers.BigNumber.from(await signer.estimateGas(rawtx))
             .mul(config.gasLimitMultiplier)
             .div(100);

src/modes/routeProcessor.ts

@@ -174,6 +174,15 @@ export async function dryrun({
         try {
             blockNumber = Number(await viemClient.getBlockNumber());
             spanAttributes["blockNumber"] = blockNumber;
+            try {
+                gasPrice = ethers.BigNumber.from(await viemClient.getGasPrice())
+                    .mul(config.gasPriceMultiplier)
+                    .div("100")
+                    .toBigInt();
+                rawtx.gasPrice = gasPrice;
+            } catch {
+                /**/
+            }
             gasLimit = ethers.BigNumber.from(await signer.estimateGas(rawtx))
                 .mul(config.gasLimitMultiplier)
                 .div(100);

src/processOrders.ts

@@ -9,7 +9,7 @@ import { BigNumber, Contract, ethers } from "ethers";
 import { Tracer } from "@opentelemetry/sdk-trace-base";
 import { Context, SpanStatusCode } from "@opentelemetry/api";
 import { fundOwnedOrders, getNonce, rotateAccounts } from "./account";
-import { containsNodeError, ErrorSeverity, errorSnapshot } from "./error";
+import { containsNodeError, ErrorSeverity, errorSnapshot, handleRevert } from "./error";
 import {
     Report,
     BotConfig,
@@ -326,11 +326,17 @@ export const processOrders = async (
                         } else if (e.reason === ProcessPairHaltReason.TxReverted) {
                             // Tx reverted onchain, this can happen for example
                             // because of mev front running or false positive opportunities, etc
-                            span.setAttribute("severity", ErrorSeverity.HIGH);
-                            span.setStatus({
-                                code: SpanStatusCode.ERROR,
-                                message: "transaction reverted onchain",
-                            });
+                            let message = "transaction reverted onchain";
+                            if (e.error) {
+                                message = errorSnapshot(message, e.error);
+                                span.setAttribute("errorDetails", message);
+                            }
+                            if (e.spanAttributes["txNoneNodeError"]) {
+                                span.setAttribute("severity", ErrorSeverity.HIGH);
+                                span.setStatus({ code: SpanStatusCode.ERROR, message });
+                            } else {
+                                span.setStatus({ code: SpanStatusCode.OK, message });
+                            }
                             span.setAttribute("unsuccessfulClear", true);
                             span.setAttribute("txReverted", true);
                         } else if (e.reason === ProcessPairHaltReason.TxMineFailed) {
@@ -777,6 +783,11 @@ export async function processPair(args: {
             return result;
         } else {
             // keep track of gas consumption of the account
+            const simulation = await handleRevert(viemClient as any, txhash);
+            if (simulation) {
+                result.error = simulation.err;
+                spanAttributes["txNoneNodeError"] = !simulation.nodeError;
+            }
             result.report = {
                 status: ProcessPairReportStatus.FoundOpportunity,
                 txUrl,

test/abis/RouteProcessor4.json

@@ -0,0 +1 @@
+{"abi":[{"inputs":[{"internalType":"address","name":"_bentoBox","type":"address"},{"internalType":"address[]","name":"priviledgedUserList","type":"address[]"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"name":"MinimalOutputBalanceViolation","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":false,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"address","name":"tokenIn","type":"address"},{"indexed":true,"internalType":"address","name":"tokenOut","type":"address"},{"indexed":false,"internalType":"uint256","name":"amountIn","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amountOut","type":"uint256"}],"name":"Route","type":"event"},{"inputs":[{"internalType":"int256","name":"amount0Delta","type":"int256"},{"internalType":"int256","name":"amount1Delta","type":"int256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"algebraSwapCallback","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"bentoBox","outputs":[{"internalType":"contract IBentoBoxMinimal","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"int256","name":"amount0Delta","type":"int256"},{"internalType":"int256","name":"amount1Delta","type":"int256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"pancakeV3SwapCallback","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"priviledgedUsers","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"address","name":"tokenOut","type":"address"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"bytes","name":"route","type":"bytes"}],"name":"processRoute","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"resume","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"},{"internalType":"bool","name":"priviledge","type":"bool"}],"name":"setPriviledge","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address payable","name":"transferValueTo","type":"address"},{"internalType":"uint256","name":"amountValueTransfer","type":"uint256"},{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"address","name":"tokenOut","type":"address"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"bytes","name":"route","type":"bytes"}],"name":"transferValueAndprocessRoute","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"int256","name":"amount0Delta","type":"int256"},{"internalType":"int256","name":"amount1Delta","type":"int256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"uniswapV3SwapCallback","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]}

test/error.test.js

@@ -0,0 +1,34 @@
+const { assert } = require("chai");
+const { BaseError } = require("viem");
+const { tryDecodeError, parseRevertError } = require("../src/error");
+
+describe("Test error", async function () {
+    const data = "0x963b34a500000000000000000000000000000000000000000000000340bda9d7e155feb0";
+
+    it("should decode the error data", async function () {
+        const result = tryDecodeError(data);
+        const expected = {
+            name: "MinimalOutputBalanceViolation",
+            args: ["60005303754817928880"],
+        };
+        assert.deepEqual(result, expected);
+    });
+
+    it("should parse viem revert error", async function () {
+        const rawError = {
+            code: -3,
+            message: "some msg",
+            data,
+        };
+        const error = new BaseError("some msg", { cause: rawError });
+        const result = parseRevertError(error);
+        const expected = {
+            raw: rawError,
+            decoded: {
+                name: "MinimalOutputBalanceViolation",
+                args: ["60005303754817928880"],
+            },
+        };
+        assert.deepEqual(result, expected);
+    });
+});

test/processPair.test.js

@@ -583,6 +583,8 @@ describe("Test process pair", async function () {
         };
         signer.sendTransaction = async () => txHash;
         viemClient.waitForTransactionReceipt = async () => errorReceipt;
+        viemClient.getTransaction = async () => ({});
+        viemClient.call = async () => Promise.reject("out of gas");
         try {
             await processPair({
                 config,
@@ -610,7 +612,7 @@ describe("Test process pair", async function () {
                     actualGasCost: formatUnits(effectiveGasPrice.mul(gasUsed)),
                 },
                 reason: ProcessPairHaltReason.TxReverted,
-                error: undefined,
+                error: "out of gas",
                 gasCost: undefined,
                 spanAttributes: {
                     "details.pair": pair,
@@ -630,6 +632,7 @@ describe("Test process pair", async function () {
                     "details.marketQuote.num": 0.99699,
                     "details.marketQuote.str": "0.99699",
                     "details.clearModePick": "rp4",
+                    txNoneNodeError: true,
                     "details.quote": JSON.stringify({
                         maxOutput: formatUnits(vaultBalance),
                         ratio: formatUnits(ethers.constants.Zero),