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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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Watch Script Duplicate Stats Fix

Date: November 2, 2025 Issue: Duplicate stats output in watch-live.sh Severity: MEDIUM (UX issue, not functional) Status: ✅ FIXED

Problem Description

The watch scripts were printing duplicate stats repeatedly when the opportunity count reached multiples of 20 (20, 40, 60, etc.):

────────────────────────────────────────────────────────────
📊 Stats:
   Opportunities: 60 | Executable: 0 | Executions: 0
   Errors: 15 (Parsing: 0 | RPC: 0 | Zero Addr: 0)
────────────────────────────────────────────────────────────

────────────────────────────────────────────────────────────
📊 Stats:
   Opportunities: 60 | Executable: 0 | Executions: 0
   Errors: 15 (Parsing: 0 | RPC: 0 | Zero Addr: 0)
────────────────────────────────────────────────────────────

[... repeated many times ...]

Root Cause Analysis

Original Logic (BUGGY)

File: scripts/watch-live.sh:141

# Show periodic stats every 20 opportunities
if [ $((OPPORTUNITIES % 20)) -eq 0 ] && [ $OPPORTUNITIES -gt 0 ]; then
    display_stats
fi

Why This Failed

The script processes the log file line by line in a while read loop:

tail -f logs/mev_bot.log | while read line; do
    # Process each line
    # ... detect opportunities, errors, etc ...

    # Check if we should display stats (line 141)
    if [ $((OPPORTUNITIES % 20)) -eq 0 ] && [ $OPPORTUNITIES -gt 0 ]; then
        display_stats  # BUG: This triggers on EVERY line!
    fi
done

Example Timeline:

Event	OPPORTUNITIES	Condition Check	Result
Opportunity #60 detected	60	`60 % 20 == 0` ✅	Stats displayed ✅
Warning line read	60	`60 % 20 == 0` ✅	Stats displayed again ❌
Another warning	60	`60 % 20 == 0` ✅	Stats displayed again ❌
Another warning	60	`60 % 20 == 0` ✅	Stats displayed again ❌
... continues for every line read ...	60	`60 % 20 == 0` ✅	Stats displayed repeatedly ❌

Key Insight: Once OPPORTUNITIES reaches 60, the condition 60 % 20 == 0 remains true forever until opportunity #61 is detected. Every non-opportunity line (warnings, errors, performance logs) still triggers the stats display!

Solution

New Logic (FIXED)

Add a state variable to track the last opportunity count when stats were displayed:

LAST_STATS_DISPLAY=0  # Initialize at start

# Show periodic stats every 20 opportunities (only when count changes)
if [ $((OPPORTUNITIES % 20)) -eq 0 ] &&
   [ $OPPORTUNITIES -gt 0 ] &&
   [ $OPPORTUNITIES -ne $LAST_STATS_DISPLAY ]; then
    display_stats
    LAST_STATS_DISPLAY=$OPPORTUNITIES  # Update last display count
fi

Three-Part Condition

$((OPPORTUNITIES % 20)) -eq 0: Is count a multiple of 20?
$OPPORTUNITIES -gt 0: Is count positive? (avoid displaying at startup)
$OPPORTUNITIES -ne $LAST_STATS_DISPLAY: Is this a NEW multiple of 20? ← KEY FIX

How It Works Now

Event	OPPORTUNITIES	LAST_STATS_DISPLAY	New Condition	Result
Opportunity #60 detected	60	0	`60 != 0` ✅	Stats displayed ✅
(Update LAST_STATS_DISPLAY)	60	60	-	-
Warning line read	60	60	`60 != 60` ❌	No display ✅
Another warning	60	60	`60 != 60` ❌	No display ✅
Another warning	60	60	`60 != 60` ❌	No display ✅
Opportunity #61 detected	61	60	`61 % 20 != 0` ❌	No display ✅
Opportunity #80 detected	80	60	`80 != 60` ✅	Stats displayed ✅

Changes Made

1. scripts/watch-live.sh

Lines 40, 142, 149 - Added state tracking:

# Line 40: Initialize tracker
LAST_STATS_DISPLAY=0  # Track last opportunity count when stats were displayed

# Line 142: Enhanced condition
if [ $((OPPORTUNITIES % 20)) -eq 0 ] && [ $OPPORTUNITIES -gt 0 ] && [ $OPPORTUNITIES -ne $LAST_STATS_DISPLAY ]; then
    # Display stats...

    # Line 149: Update tracker
    LAST_STATS_DISPLAY=$OPPORTUNITIES  # Update last display count
fi

2. scripts/watch-live-enhanced.sh

Lines 384-388 - Same fix with associative array:

# Update stats display periodically (only when count actually changes)
local current_count=${STATS["opportunities_total"]}
if [[ $((current_count % UPDATE_INTERVAL)) -eq 0 ]] &&
   [[ $current_count -gt 0 ]] &&
   [[ $current_count -ne $last_stats_update ]]; then
    last_stats_update=$current_count
    display_stats
fi

Verification

Test Case 1: Basic Functionality ✅

$ ./scripts/watch-live.sh
# Stats appear at opportunities: 20, 40, 60, 80, 100...
# No duplicates between opportunity detections

Test Case 2: Warning Messages ✅

# When OPPORTUNITIES = 60:
# Process 100 warning lines
# Expected: 1 stats display (at opportunity #60)
# Actual: 1 stats display ✅

Test Case 3: Edge Cases ✅

Case	Expected Behavior	Result
Startup (0 opportunities)	No stats	✅ Pass
First 19 opportunities	No stats	✅ Pass
Opportunity #20	Stats displayed once	✅ Pass
1000 log lines at count 20	Stats only once	✅ Pass
Opportunity #40	Stats displayed once	✅ Pass

Performance Impact

Before Fix

CPU Usage: Higher (unnecessary string formatting on every line)
Terminal Output: Flooded with duplicate stats
User Experience: Confusing and difficult to read

After Fix

CPU Usage: Minimal (condition check only)
Terminal Output: Clean, stats appear exactly once per milestone
User Experience: Clear and professional

Modified

scripts/watch-live.sh (lines 40, 142, 149)
scripts/watch-live-enhanced.sh (lines 384-388)

Documentation

docs/LOGGING_AUDIT_REPORT_20251102.md - Comprehensive logging audit
docs/WATCH_SCRIPT_DUPLICATE_STATS_FIX.md - This document

Lessons Learned

Shell Script State Management

Issue: Shell variables in while read loops maintain state across iterations
Mistake: Checking only the current count without tracking previous state
Solution: Always track "last action state" for periodic operations

Common Pattern

This is a common bug pattern in monitoring scripts:

# ❌ BAD: Triggers on every line when count is a multiple
if [ $((COUNT % INTERVAL)) -eq 0 ]; then
    perform_action
fi

# ✅ GOOD: Triggers only when count changes to a new multiple
if [ $((COUNT % INTERVAL)) -eq 0 ] && [ $COUNT -ne $LAST_ACTION ]; then
    perform_action
    LAST_ACTION=$COUNT
fi

Debugging Tip

When debugging duplicate outputs in log processors:

Add debug output showing $COUNT and $LAST_ACTION values
Trace which lines trigger the condition
Look for missing state updates

Conclusion

The duplicate stats issue was caused by a state management bug in the periodic display logic. The condition checked if the count was a multiple of 20, but didn't verify if stats had already been displayed for that count.

Fix: Added LAST_STATS_DISPLAY tracker to ensure stats display only once per milestone.

Impact: Clean, professional output with stats appearing exactly when expected (every 20 opportunities).

Status: ✅ RESOLVED - Both watch scripts now work correctly.

Fixed By: Claude Code Date: November 2, 2025 Verified: ✅ Both scripts tested and working

7.9 KiB Raw Blame History