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Krypto Kajun 52d555ccdf fix(critical): complete execution pipeline - all blockers fixed and operational

2025-11-04 10:24:34 -06:00

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Active Log Analysis - MEV Bot Errors

Date: October 31, 2025 01:05 UTC Status: 🔴 CRITICAL ERRORS ACTIVE Bot State: ✅ Running, ❌ Generating Errors

🚨 Executive Summary

CRITICAL FINDING: The MEV bot is currently running and actively generating ABI unmarshaling errors. Analysis of live logs reveals the bot is operational but experiencing 12,094 ABI unmarshaling errors and 0 DEX transaction detection.

📊 Current System Status

Log File Sizes

mev_bot_errors.log:       60MB (268,590 lines)  ⚠️ GROWING
mev_bot.log:             851KB
mev_bot_performance.log:  52MB
mev_bot_opportunities.log: 8.3MB

Error Statistics (Since Last Archive)

ABI Unmarshaling Errors: 12,094 occurrences (still growing)
Pool Data Fetch Failures: Continuous
WebSocket Warnings: Multiple 403/404 errors on startup
DEX Transaction Detection: 0 found (critical issue)

Bot Operational Status

✅ Bot Process: RUNNING
✅ Build Status: SUCCESSFUL
✅ Block Processing: ACTIVE (block 395229900+)
❌ DEX Detection: FAILING (0 transactions found)
❌ Pool Data Fetch: FAILING (ABI errors)
⚠️  WebSocket: Degraded (using fallback HTTP)

🔴 Active Error #1: ABI Unmarshaling (CRITICAL)

Error Pattern

[WARN] Failed to fetch batch 0-1: failed to unpack response:
abi: cannot unmarshal struct {
    V2Data []struct {...};
    V3Data []struct {...};
    BlockNumber *big.Int;
    Timestamp *big.Int
} in to []datafetcher.DataFetcherV2PoolData

Frequency

12,094 errors in current log
Continuous occurrence (latest at 01:04:36)
Every pool data fetch attempt fails

Affected Pools (Recent Examples)

0x5886e46E6DD497d7501f103a58ff4242bCaa2556 - Block 395229561
0xc1bF07800063EFB46231029864cd22325ef8EFe8 - Block 395229589
0xd13040d4fe917EE704158CfCB3338dCd2838B245 - Block 395229626 (3 failures)
0x62Ca40a493e99470e6fa0F2Dc87b5634515B6211 - Block 395229703
0xC6962004f452bE9203591991D15f6b388e09E8D0 - Block 395229703
0xbF24f38243392A0b4b7A13d10Dbf294F40aE401B - Block 395229747

Root Cause Analysis

The Error Message Reveals:

Contract returns: BatchResponse { V2Data, V3Data, BlockNumber, Timestamp }
Code expects:     []V2PoolData (array)

THIS IS A MISMATCH between:

Deployed contract ABI (returns BatchResponse struct)
Code expectation (expects simple array)

Deployed Contract Investigation

Contract Addresses Found:

.env.production: 0xC6BD82306943c0F3104296a46113ca0863723cBD
.env.staging: 0x3c2c9c86f081b9dac1f0bf97981cfbe96436b89d
.env: NOT SET (using production by default?)

Critical Question: Does the deployed contract at 0xC6BD82306943c0F3104296a46113ca0863723cBD have:

Function: batchFetchAllData() returning BatchResponse?
OR: Old function returning just arrays?

Source of Error

File: pkg/datafetcher/batch_fetcher.go:144

var response datafetcher.DataFetcherBatchResponse
err = dataFetcherABI.UnpackIntoInterface(&response, "batchFetchAllData", result)

Code is CORRECT - it unpacks into BatchResponse.

BUT: Error message says it's trying to unpack into []DataFetcherV2PoolData

HYPOTHESIS: There might be TWO different code paths:

New code (batch_fetcher.go) - Uses BatchResponse ✅
Old code (somewhere else) - Expects arrays ❌

🔴 Active Error #2: Zero DEX Transactions Detected

Current Behavior

[INFO] Block 395229898: Processing 14 transactions, found 0 DEX transactions
[INFO] Block 395229899: Processing 12 transactions, found 0 DEX transactions
[INFO] Block 395229900: Processing 14 transactions, found 0 DEX transactions

Analysis

Bot is processing blocks ✅
Bot is checking transactions ✅
NO DEX transactions being detected ❌

This confirms the issue identified in the swap detection fix:

Discovered pools (96) NOT in DEX filter
Only hardcoded routers (~20) in filter
Result: All swaps on discovered pools filtered out

Status of Fix: ✅ Code written, ⏸️ Needs bot restart to activate

🔴 Active Error #3: WebSocket Connection Failures

Errors on Startup

Warning: failed to connect to WebSocket endpoint
wss://arbitrum-mainnet.core.chainstack.com/...:
websocket: bad handshake (HTTP status 403 Forbidden)

Warning: failed to connect to WebSocket endpoint
wss://arb1.arbitrum.io/ws:
websocket: bad handshake (HTTP status 404 Not Found)

Impact

⚠️ Bot falls back to HTTP polling
⚠️ Higher latency for new blocks
⚠️ Increased RPC call overhead
✅ Bot still operational (not fatal)

RPC Endpoints Status

Chainstack WS (wss://arbitrum-mainnet.core.chainstack.com/...) - 403 Forbidden (API key issue)
Public Arbitrum WS (wss://arb1.arbitrum.io/ws) - 404 Not Found (endpoint doesn't exist)
HTTP Fallback - Working

📁 Log File Growth Analysis

Current Growth Rate

Oct 30 19:40: mev_bot_errors.log = 56MB
Oct 31 01:05: mev_bot_errors.log = 60MB
Growth: 4MB in ~5.5 hours = 727KB/hour = 17.4MB/day

Projection

24 hours: Error log will reach 77MB
7 days: Error log will reach 178MB
30 days: Error log will reach 580MB

Recommendation

Implement log rotation immediately or archive current logs.

🔍 Detailed Error Chain Analysis

Error Sequence for Pool Data Fetch

1. Swap event detected on pool X
2. Bot attempts to fetch pool data via DataFetcher contract
3. Contract called: batchFetchAllData([X])
4. Contract returns: BatchResponse { V2Data: [], V3Data: [pool X data], ... }
5. ABI unmarshaling ERROR: "cannot unmarshal struct ... in to []V2PoolData"
6. Result: "no data returned for pool X"
7. Pool data unavailable for arbitrage calculation

Impact on Arbitrage Detection

Swap Detected → Pool Data Needed → Fetch FAILS → No Arbitrage Check
     ✅              ✅               ❌           ❌

Result: Even if swaps were detected, arbitrage calculation would fail due to missing pool data.

🎯 Root Cause Hypotheses

Hypothesis #1: Deployed Contract Has Old ABI (MOST LIKELY)

Evidence:

Bindings are correct (verified in previous analysis)
Code usage is correct (unpacking into BatchResponse)
Error says contract returns struct BUT code expects array

Explanation: The deployed contract at 0xC6BD82306943c0F3104296a46113ca0863723cBD might be an OLD version that:

Has function batchFetchV2Data() returning []V2PoolData
Does NOT have batchFetchAllData() returning BatchResponse
OR has batchFetchAllData() but returns different structure

Test: Call the contract directly to check actual ABI

Hypothesis #2: Multiple Contract Instances

Evidence: Found different addresses in different env files

Explanation:

Production contract: 0xC6BD82306943c0F3104296a46113ca0863723cBD
Staging contract: 0x3c2c9c86f081b9dac1f0bf97981cfbe96436b89d
Bot might be calling one while bindings match another

Hypothesis #3: Network Response Corruption

Evidence: Intermittent nature of errors

Explanation: Network issues or RPC provider problems corrupting responses

Likelihood: LOW (errors are consistent, not intermittent)

🔧 Immediate Actions Required

Priority 1: Verify Deployed Contract ABI ⏰ 15 minutes

# Option A: Use cast (Foundry)
cast abi 0xC6BD82306943c0F3104296a46113ca0863723cBD --rpc-url https://arb1.arbitrum.io/rpc

# Option B: Check Arbiscan
curl "https://api.arbiscan.io/api?module=contract&action=getsourcecode&address=0xC6BD82306943c0F3104296a46113ca0863723cBD"

# Option C: Try calling the function directly
cast call 0xC6BD82306943c0F3104296a46113ca0863723cBD \
  "batchFetchAllData((address[],address[]))" "([][])" \
  --rpc-url https://arb1.arbitrum.io/rpc

Priority 2: Deploy New DataFetcher Contract ⏰ 30 minutes

cd /home/administrator/projects/Mev-Alpha

# Deploy DataFetcher with correct ABI
forge script script/DeployDataFetcher.s.sol \
  --rpc-url $ARBITRUM_RPC_ENDPOINT \
  --private-key $DEPLOYER_PRIVATE_KEY \
  --broadcast \
  --verify

# Update contract address in .env.production
# Restart bot

Priority 3: Archive Current Error Logs ⏰ 5 minutes

cd /home/administrator/projects/mev-beta
./scripts/archive-logs.sh
> logs/mev_bot_errors.log  # Start fresh

Priority 4: Restart Bot with Swap Detection Fix ⏰ 2 minutes

# Kill current bot
pkill -9 -f mev-bot

# Start with fresh logs
./mev-bot start 2>&1 | tee logs/startup_with_fix.log

📊 Comparison: Expected vs Actual

Expected Behavior (After Fixes)

✅ Bot detects swaps on 96 discovered pools
✅ Fetches pool data successfully
✅ Calculates arbitrage opportunities
✅ Finds 5-10+ opportunities per hour

Actual Current Behavior

❌ Bot detects 0 swaps (filter issue)
❌ Pool data fetch fails (ABI mismatch)
❌ No arbitrage opportunities
❌ Generating 12,094+ errors

🎯 Success Criteria Post-Fix

After implementing fixes, logs should show:

✅ DEX transactions detected > 0
✅ Pool data fetched successfully
✅ Zero ABI unmarshaling errors
✅ Arbitrage opportunities identified
✅ Error log growth < 1MB/day

📈 Bot Activity Summary

Blocks Processed

Range: 395229561 → 395229900+ (339+ blocks)
Rate: ~339 blocks in ~6 minutes = ~56 blocks/minute ❌ TOO FAST
Expected: ~4-5 blocks/minute on Arbitrum
Issue: Bot processing old blocks or time calculation wrong

Transactions Analyzed

Total: ~4,200+ transactions (339 blocks × ~12 txs/block avg)
DEX Identified: 0
DEX Success Rate: 0%

Pool Data Attempts

Attempts: Hundreds (one per swap event would be detected)
Successes: 0
Failure Rate: 100%

Configuration Files

.env.production - Production config (contains DataFetcher address)
pkg/datafetcher/batch_fetcher.go:90 - Error logging location
pkg/datafetcher/batch_fetcher.go:144 - Unmarshaling location

Contract Addresses

Production DataFetcher: 0xC6BD82306943c0F3104296a46113ca0863723cBD
Staging DataFetcher: 0x3c2c9c86f081b9dac1f0bf97981cfbe96436b89d
Universal Router (for reference): 0xA51afAFe0263b40EdaEf0Df8781eA9aa03E381a3

Source Contracts (Mev-Alpha)

/home/administrator/projects/Mev-Alpha/src/core/DataFetcher.sol

💡 Key Insights

Bot IS Running Successfully - Not hung, actively processing blocks
Errors Are Real-Time - Not historical, happening now
Dual Problem:
- Can't detect swaps (filter issue - fix ready)
- Can't fetch pool data (ABI mismatch - needs investigation)
Contract Deployment - Likely root cause is old/wrong contract deployed
WebSocket Not Critical - Bot works with HTTP fallback

🚀 Recommended Action Sequence

IMMEDIATE (Next 1 hour):

✅ Verify deployed DataFetcher contract ABI (15 min)
⏸️ If wrong ABI: Deploy new contract OR update address (30 min)
⏸️ If correct ABI: Debug unmarshaling code path (30 min)
✅ Archive current logs (5 min)
✅ Restart bot to activate swap detection fix (2 min)

SHORT TERM (Next 24 hours):

Monitor error log growth
Verify DEX transactions being detected
Confirm pool data fetching works
Track arbitrage opportunities

LONG TERM:

Implement log rotation automation
Add contract ABI verification on startup
Add health check dashboard
Set up alerting for error rate spikes

Document Created: October 31, 2025 01:05 UTC Analysis Duration: ~20 minutes Conclusion: 🔴 CRITICAL - Deployed contract ABI mismatch causing 100% pool data fetch failures

This analysis confirms the bot is operational but completely unable to fetch pool data due to ABI mismatch with the deployed DataFetcher contract. The swap detection fix is ready but cannot be fully tested until pool data fetching works.

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