fix(critical): complete execution pipeline - all blockers fixed and operational
This commit is contained in:
Krypto Kajun
917
docs/CRITICAL_FIXES_RECOMMENDATIONS_20251030.md
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917
docs/CRITICAL_FIXES_RECOMMENDATIONS_20251030.md
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@@ -0,0 +1,917 @@
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# Critical Fixes and Recommendations
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**Date**: 2025-10-30
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**Priority**: URGENT - Production System Failure
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**Related**: LOG_ANALYSIS_COMPREHENSIVE_REPORT_20251030.md
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## 🚨 IMMEDIATE ACTIONS (Next 24 Hours)
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### Priority 0: Fix WebSocket Connection
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**Issue**: 9,065 "unsupported protocol scheme wss" errors
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**Impact**: Cannot connect to Arbitrum network via WebSocket
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#### Root Cause
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Code is using HTTP client (`http.Post`) to connect to WebSocket URLs (`wss://`)
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#### Fix Required
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**File**: `pkg/arbitrum/connection.go` or `pkg/monitor/concurrent.go`
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**Current (Incorrect)**:
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```go
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// Somewhere in connection initialization
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client, err := rpc.Dial(wsEndpoint) // or similar HTTP-based call
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resp, err := http.Post(wsEndpoint, ...) // WRONG for WebSocket
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```
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**Fixed (Correct)**:
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```go
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import (
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"github.com/ethereum/go-ethereum/ethclient"
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)
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// For WebSocket connections
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func connectWebSocket(wsURL string) (*ethclient.Client, error) {
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client, err := ethclient.Dial(wsURL)
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if err != nil {
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return nil, fmt.Errorf("failed to connect to %s: %w", wsURL, err)
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}
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return client, nil
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}
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// For HTTP connections (fallback)
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func connectHTTP(httpURL string) (*ethclient.Client, error) {
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client, err := ethclient.Dial(httpURL)
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if err != nil {
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return nil, fmt.Errorf("failed to connect to %s: %w", httpURL, err)
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}
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return client, nil
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}
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```
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**Implementation Steps**:
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1. Locate RPC client initialization code
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2. Check if using `rpc.Dial()` vs `ethclient.Dial()`
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3. Ensure WebSocket URLs use `ethclient.Dial()` directly
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4. Remove any HTTP POST attempts to WebSocket endpoints
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5. Test connection with: `timeout 30 ./mev-bot start`
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**Validation**:
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```bash
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# Should see successful WebSocket connection
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LOG_LEVEL=debug ./mev-bot start 2>&1 | grep -i "websocket\|wss"
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```
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### Priority 0: Fix Zero Address Parsing
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**Issue**: 100% of liquidity events contain zero addresses
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**Impact**: Invalid event data, corrupted arbitrage detection
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#### Root Cause
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Token address extraction from transaction logs returning zero addresses instead of actual token addresses.
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#### Fix Required
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**File**: `pkg/arbitrum/abi_decoder.go`
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**Current Issue**: Token extraction logic likely doing:
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```go
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// WRONG - returning zero address on extraction failure
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func extractTokenAddress(log types.Log) common.Address {
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// If parsing fails, returns common.Address{} which is 0x000...
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return common.Address{}
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}
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```
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**Fixed Implementation**:
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```go
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func extractTokenAddress(log types.Log, topicIndex int) (common.Address, error) {
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if len(log.Topics) <= topicIndex {
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return common.Address{}, fmt.Errorf("topic index %d out of range", topicIndex)
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}
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address := common.BytesToAddress(log.Topics[topicIndex].Bytes())
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// CRITICAL: Validate address is not zero
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if address == (common.Address{}) {
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return common.Address{}, fmt.Errorf("extracted zero address from topic %d", topicIndex)
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}
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return address, nil
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}
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// For event parsing
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func parseSwapEvent(log types.Log) (*SwapEvent, error) {
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// Extract token addresses from pool
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pool, err := getPoolContract(log.Address)
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if err != nil {
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return nil, fmt.Errorf("failed to get pool: %w", err)
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}
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token0, err := pool.Token0(nil)
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if err != nil {
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return nil, fmt.Errorf("failed to get token0: %w", err)
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}
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token1, err := pool.Token1(nil)
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if err != nil {
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return nil, fmt.Errorf("failed to get token1: %w", err)
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}
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// Validate addresses
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if token0 == (common.Address{}) || token1 == (common.Address{}) {
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return nil, fmt.Errorf("zero address detected: token0=%s, token1=%s", token0.Hex(), token1.Hex())
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}
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return &SwapEvent{
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Token0Address: token0,
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Token1Address: token1,
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// ...
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}, nil
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}
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```
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**Additional Checks Needed**:
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1. Add validation before event submission
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2. Log and skip events with zero addresses
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3. Add metrics for zero address detections
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4. Review pool contract call logic
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**Validation**:
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```bash
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# Check for zero addresses in new events
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tail -f logs/liquidity_events_*.jsonl | jq -r '.token0Address, .token1Address' | grep -v "0x0000000000000000000000000000000000000000"
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```
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### Priority 0: Implement Rate Limiting Strategy
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**Issue**: 100,709 rate limit errors (429 Too Many Requests)
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**Impact**: Service degradation, failed API calls, incomplete data
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#### Short-Term Fix (Immediate)
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**File**: `internal/config/config.go` and `pkg/arbitrum/connection.go`
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```go
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type RateLimiter struct {
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limiter *rate.Limiter
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maxRetries int
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backoff time.Duration
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}
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func NewRateLimiter(rps int, burst int) *RateLimiter {
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return &RateLimiter{
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limiter: rate.NewLimiter(rate.Limit(rps), burst),
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maxRetries: 3,
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backoff: time.Second,
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}
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}
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func (rl *RateLimiter) Do(ctx context.Context, fn func() error) error {
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for attempt := 0; attempt <= rl.maxRetries; attempt++ {
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// Wait for rate limit token
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if err := rl.limiter.Wait(ctx); err != nil {
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return fmt.Errorf("rate limiter error: %w", err)
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}
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err := fn()
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if err == nil {
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return nil
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}
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// Check if it's a rate limit error
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if strings.Contains(err.Error(), "429") || strings.Contains(err.Error(), "Too Many Requests") {
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backoff := rl.backoff * time.Duration(1<<attempt) // Exponential backoff
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log.Printf("Rate limited, backing off for %v (attempt %d/%d)", backoff, attempt+1, rl.maxRetries)
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time.Sleep(backoff)
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continue
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}
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return err // Non-rate-limit error
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}
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return fmt.Errorf("max retries exceeded")
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}
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```
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**Configuration**:
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```yaml
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# config/arbitrum_production.yaml
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rpc:
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rate_limit:
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requests_per_second: 10 # Conservative limit
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burst: 20
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max_retries: 3
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backoff_seconds: 1
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```
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**Apply to all RPC calls**:
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```go
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// Example usage
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err := rateLimiter.Do(ctx, func() error {
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block, err := client.BlockByNumber(ctx, blockNum)
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return err
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})
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```
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#### Long-Term Fix (48 hours)
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**Upgrade RPC Provider**:
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1. **Option A**: Purchase paid Chainstack plan with higher RPS limits
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2. **Option B**: Add multiple RPC providers with load balancing
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3. **Option C**: Run local Arbitrum archive node
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**Recommended Multi-Provider Setup**:
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```go
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type RPCProvider struct {
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Name string
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Endpoint string
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RPS int
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Priority int
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}
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var providers = []RPCProvider{
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{Name: "Chainstack", Endpoint: "wss://arbitrum-mainnet.core.chainstack.com/...", RPS: 25, Priority: 1},
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{Name: "Alchemy", Endpoint: "wss://arb-mainnet.g.alchemy.com/v2/YOUR_KEY", RPS: 50, Priority: 2},
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{Name: "Infura", Endpoint: "wss://arbitrum-mainnet.infura.io/ws/v3/YOUR_KEY", RPS: 50, Priority: 3},
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{Name: "Fallback", Endpoint: "https://arb1.arbitrum.io/rpc", RPS: 5, Priority: 4},
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}
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```
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## 🔧 CRITICAL FIXES (24-48 Hours)
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### Fix 1: Connection Manager Resilience
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**File**: `pkg/arbitrum/connection.go`
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**Enhanced Connection Manager**:
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```go
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type EnhancedConnectionManager struct {
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providers []RPCProvider
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activeProvider int
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rateLimiters map[string]*RateLimiter
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healthChecks map[string]*HealthStatus
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mu sync.RWMutex
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}
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type HealthStatus struct {
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LastCheck time.Time
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IsHealthy bool
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ErrorCount int
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SuccessCount int
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Latency time.Duration
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}
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func (m *EnhancedConnectionManager) GetClient(ctx context.Context) (*ethclient.Client, error) {
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m.mu.RLock()
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defer m.mu.RUnlock()
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// Try providers in priority order
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for _, provider := range m.sortedProviders() {
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health := m.healthChecks[provider.Name]
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// Skip unhealthy providers
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if !health.IsHealthy {
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continue
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}
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// Apply rate limiting
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limiter := m.rateLimiters[provider.Name]
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var client *ethclient.Client
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err := limiter.Do(ctx, func() error {
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c, err := ethclient.DialContext(ctx, provider.Endpoint)
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if err != nil {
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return err
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}
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client = c
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return nil
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})
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if err == nil {
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m.updateHealthSuccess(provider.Name)
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return client, nil
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}
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m.updateHealthFailure(provider.Name, err)
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}
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return nil, fmt.Errorf("all RPC providers unavailable")
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}
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func (m *EnhancedConnectionManager) StartHealthChecks(ctx context.Context) {
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ticker := time.NewTicker(30 * time.Second)
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defer ticker.Stop()
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for {
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select {
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case <-ctx.Done():
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return
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case <-ticker.C:
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m.checkAllProviders(ctx)
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}
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}
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}
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```
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**Validation**:
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```bash
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# Monitor connection switching
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LOG_LEVEL=debug ./mev-bot start 2>&1 | grep -i "provider\|connection\|health"
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```
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### Fix 2: Correct Health Scoring
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**File**: `scripts/log-manager.sh:188`
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**Current Bug**:
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```bash
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# Line 188 - unquoted variable causing "[: too many arguments"
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if [ $error_rate -gt 10 ]; then
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```
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**Fixed**:
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```bash
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# Properly quote variables and handle empty values
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if [ -n "$error_rate" ] && [ "$(echo "$error_rate > 10" | bc)" -eq 1 ]; then
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health_status="concerning"
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elif [ -n "$error_rate" ] && [ "$(echo "$error_rate > 5" | bc)" -eq 1 ]; then
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health_status="warning"
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else
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health_status="healthy"
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fi
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```
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**Enhanced Health Calculation**:
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```bash
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calculate_health_score() {
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local total_lines=$1
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local error_lines=$2
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local warning_lines=$3
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local rpc_errors=$4
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local zero_addresses=$5
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# Start with 100
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local health_score=100
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# Deduct for error rate
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local error_rate=$(echo "scale=2; $error_lines * 100 / $total_lines" | bc -l 2>/dev/null || echo 0)
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health_score=$(echo "$health_score - $error_rate" | bc)
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# Deduct for RPC failures (each 100 failures = -1 point)
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local rpc_penalty=$(echo "scale=2; $rpc_errors / 100" | bc -l 2>/dev/null || echo 0)
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health_score=$(echo "$health_score - $rpc_penalty" | bc)
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# Deduct for zero addresses (each occurrence = -0.01 point)
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local zero_penalty=$(echo "scale=2; $zero_addresses / 100" | bc -l 2>/dev/null || echo 0)
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health_score=$(echo "$health_score - $zero_penalty" | bc)
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# Floor at 0
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if [ "$(echo "$health_score < 0" | bc)" -eq 1 ]; then
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health_score=0
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fi
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echo "$health_score"
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}
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```
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### Fix 3: Port Conflict Resolution
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**Issue**: Metrics (9090) and Dashboard (8080) port conflicts
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**File**: `cmd/mev-bot/main.go`
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**Current**:
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```go
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go startMetricsServer(":9090")
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go startDashboard(":8080")
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```
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**Fixed with Port Checking**:
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```go
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func startWithPortCheck(service string, preferredPort int, handler http.Handler) error {
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port := preferredPort
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maxAttempts := 5
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for attempt := 0; attempt < maxAttempts; attempt++ {
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addr := fmt.Sprintf(":%d", port)
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server := &http.Server{
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Addr: addr,
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Handler: handler,
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}
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listener, err := net.Listen("tcp", addr)
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if err != nil {
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log.Printf("%s port %d in use, trying %d", service, port, port+1)
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port++
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continue
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}
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log.Printf("✅ %s started on port %d", service, port)
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return server.Serve(listener)
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}
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return fmt.Errorf("failed to start %s after %d attempts", service, maxAttempts)
|
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}
|
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|
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// Usage
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go startWithPortCheck("Metrics", 9090, metricsHandler)
|
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go startWithPortCheck("Dashboard", 8080, dashboardHandler)
|
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```
|
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|
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**Alternative - Environment Variables**:
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```go
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metricsPort := os.Getenv("METRICS_PORT")
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if metricsPort == "" {
|
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metricsPort = "9090"
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}
|
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|
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dashboardPort := os.Getenv("DASHBOARD_PORT")
|
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if dashboardPort == "" {
|
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dashboardPort = "8080"
|
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}
|
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```
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## 📋 HIGH PRIORITY FIXES (48-72 Hours)
|
||||
|
||||
### Fix 4: Implement Request Caching
|
||||
|
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**Why**: Reduce RPC calls by 60-80%
|
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|
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**File**: `pkg/arbitrum/pool_cache.go` (new)
|
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|
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```go
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type PoolDataCache struct {
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cache *cache.Cache // Using patrickmn/go-cache
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mu sync.RWMutex
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}
|
||||
|
||||
type CachedPoolData struct {
|
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Token0 common.Address
|
||||
Token1 common.Address
|
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Fee *big.Int
|
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Liquidity *big.Int
|
||||
FetchedAt time.Time
|
||||
}
|
||||
|
||||
func NewPoolDataCache() *PoolDataCache {
|
||||
return &PoolDataCache{
|
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cache: cache.New(5*time.Minute, 10*time.Minute),
|
||||
}
|
||||
}
|
||||
|
||||
func (c *PoolDataCache) GetPoolData(ctx context.Context, poolAddr common.Address, fetcher func() (*CachedPoolData, error)) (*CachedPoolData, error) {
|
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key := poolAddr.Hex()
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|
||||
// Check cache first
|
||||
if data, found := c.cache.Get(key); found {
|
||||
return data.(*CachedPoolData), nil
|
||||
}
|
||||
|
||||
// Cache miss - fetch from RPC
|
||||
data, err := fetcher()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Store in cache
|
||||
c.cache.Set(key, data, cache.DefaultExpiration)
|
||||
|
||||
return data, nil
|
||||
}
|
||||
```
|
||||
|
||||
**Usage**:
|
||||
```go
|
||||
poolData, err := poolCache.GetPoolData(ctx, poolAddress, func() (*CachedPoolData, error) {
|
||||
// This only runs on cache miss
|
||||
token0, _ := poolContract.Token0(nil)
|
||||
token1, _ := poolContract.Token1(nil)
|
||||
fee, _ := poolContract.Fee(nil)
|
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liquidity, _ := poolContract.Liquidity(nil)
|
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|
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return &CachedPoolData{
|
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Token0: token0,
|
||||
Token1: token1,
|
||||
Fee: fee,
|
||||
Liquidity: liquidity,
|
||||
FetchedAt: time.Now(),
|
||||
}, nil
|
||||
})
|
||||
```
|
||||
|
||||
### Fix 5: Batch RPC Requests
|
||||
|
||||
**File**: `pkg/arbitrum/batch_requests.go` (new)
|
||||
|
||||
```go
|
||||
type BatchRequest struct {
|
||||
calls []rpc.BatchElem
|
||||
mu sync.Mutex
|
||||
}
|
||||
|
||||
func (b *BatchRequest) AddPoolDataRequest(poolAddr common.Address) int {
|
||||
b.mu.Lock()
|
||||
defer b.mu.Unlock()
|
||||
|
||||
idx := len(b.calls)
|
||||
|
||||
// Add all pool data calls in one batch
|
||||
b.calls = append(b.calls,
|
||||
rpc.BatchElem{Method: "eth_call", Args: []interface{}{/* token0 call */}},
|
||||
rpc.BatchElem{Method: "eth_call", Args: []interface{}{/* token1 call */}},
|
||||
rpc.BatchElem{Method: "eth_call", Args: []interface{}{/* fee call */}},
|
||||
rpc.BatchElem{Method: "eth_call", Args: []interface{}{/* liquidity call */}},
|
||||
)
|
||||
|
||||
return idx
|
||||
}
|
||||
|
||||
func (b *BatchRequest) Execute(client *rpc.Client) error {
|
||||
b.mu.Lock()
|
||||
defer b.mu.Unlock()
|
||||
|
||||
if len(b.calls) == 0 {
|
||||
return nil
|
||||
}
|
||||
|
||||
err := client.BatchCall(b.calls)
|
||||
if err != nil {
|
||||
return fmt.Errorf("batch call failed: %w", err)
|
||||
}
|
||||
|
||||
// Check individual results
|
||||
for i, call := range b.calls {
|
||||
if call.Error != nil {
|
||||
log.Printf("Batch call %d failed: %v", i, call.Error)
|
||||
}
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
```
|
||||
|
||||
**Impact**: Reduce 4 separate RPC calls per pool to 1 batch call
|
||||
- **Before**: 100 pools × 4 calls = 400 RPC requests
|
||||
- **After**: 100 pools ÷ 1 batch = 1 RPC request (with 400 sub-calls)
|
||||
|
||||
### Fix 6: Improve Arbitrage Profitability Calculation
|
||||
|
||||
**File**: `pkg/arbitrage/detection_engine.go`
|
||||
|
||||
**Issues**:
|
||||
1. Gas cost estimation too high
|
||||
2. Slippage tolerance too conservative
|
||||
3. Zero amounts causing invalid calculations
|
||||
|
||||
**Enhanced Calculation**:
|
||||
```go
|
||||
type ProfitCalculator struct {
|
||||
gasPrice *big.Int
|
||||
priorityFee *big.Int
|
||||
slippageBps int64 // Basis points (100 = 1%)
|
||||
minProfitUSD float64
|
||||
executionGasLimit uint64
|
||||
}
|
||||
|
||||
func (pc *ProfitCalculator) CalculateNetProfit(opp *Opportunity) (*ProfitEstimate, error) {
|
||||
// Validate inputs
|
||||
if opp.AmountIn.Cmp(big.NewInt(0)) == 0 || opp.AmountOut.Cmp(big.NewInt(0)) == 0 {
|
||||
return nil, fmt.Errorf("zero amount detected: amountIn=%s, amountOut=%s",
|
||||
opp.AmountIn.String(), opp.AmountOut.String())
|
||||
}
|
||||
|
||||
// Calculate gross profit in ETH
|
||||
grossProfit := new(big.Int).Sub(opp.AmountOut, opp.AmountIn)
|
||||
grossProfitETH := new(big.Float).Quo(
|
||||
new(big.Float).SetInt(grossProfit),
|
||||
new(big.Float).SetInt(big.NewInt(1e18)),
|
||||
)
|
||||
|
||||
// Realistic gas estimation
|
||||
gasLimit := pc.executionGasLimit // e.g., 300,000
|
||||
if opp.IsMultiHop {
|
||||
gasLimit *= 2 // Multi-hop needs more gas
|
||||
}
|
||||
|
||||
gasPrice := new(big.Int).Add(pc.gasPrice, pc.priorityFee)
|
||||
gasCost := new(big.Int).Mul(gasPrice, big.NewInt(int64(gasLimit)))
|
||||
gasCostETH := new(big.Float).Quo(
|
||||
new(big.Float).SetInt(gasCost),
|
||||
new(big.Float).SetInt(big.NewInt(1e18)),
|
||||
)
|
||||
|
||||
// Apply slippage tolerance
|
||||
slippageMultiplier := float64(10000-pc.slippageBps) / 10000.0
|
||||
grossProfitWithSlippage, _ := new(big.Float).Mul(
|
||||
grossProfitETH,
|
||||
big.NewFloat(slippageMultiplier),
|
||||
).Float64()
|
||||
|
||||
gasCostFloat, _ := gasCostETH.Float64()
|
||||
netProfitETH := grossProfitWithSlippage - gasCostFloat
|
||||
|
||||
// Calculate in USD
|
||||
ethPriceUSD := pc.getETHPrice() // From oracle or cache
|
||||
netProfitUSD := netProfitETH * ethPriceUSD
|
||||
|
||||
return &ProfitEstimate{
|
||||
GrossProfitETH: grossProfitETH,
|
||||
GasCostETH: gasCostETH,
|
||||
NetProfitETH: big.NewFloat(netProfitETH),
|
||||
NetProfitUSD: netProfitUSD,
|
||||
IsExecutable: netProfitUSD >= pc.minProfitUSD,
|
||||
SlippageApplied: pc.slippageBps,
|
||||
GasLimitUsed: gasLimit,
|
||||
}, nil
|
||||
}
|
||||
```
|
||||
|
||||
**Configuration**:
|
||||
```yaml
|
||||
# config/arbitrum_production.yaml
|
||||
arbitrage:
|
||||
profit_calculation:
|
||||
min_profit_usd: 5.0 # Minimum $5 profit
|
||||
slippage_bps: 50 # 0.5% slippage tolerance
|
||||
gas_limit: 300000 # Base gas limit
|
||||
priority_fee_gwei: 0.1 # Additional priority fee
|
||||
```
|
||||
|
||||
## 🔄 OPERATIONAL IMPROVEMENTS (Week 1)
|
||||
|
||||
### Improvement 1: Automated Log Rotation
|
||||
|
||||
**File**: `/etc/logrotate.d/mev-bot` (system config)
|
||||
|
||||
```
|
||||
/home/administrator/projects/mev-beta/logs/*.log {
|
||||
daily
|
||||
rotate 7
|
||||
compress
|
||||
delaycompress
|
||||
missingok
|
||||
notifempty
|
||||
create 0600 administrator administrator
|
||||
size 50M
|
||||
postrotate
|
||||
/usr/bin/systemctl reload mev-bot.service > /dev/null 2>&1 || true
|
||||
endscript
|
||||
}
|
||||
```
|
||||
|
||||
### Improvement 2: Real-Time Alerting
|
||||
|
||||
**File**: `pkg/monitoring/alerts.go` (new)
|
||||
|
||||
```go
|
||||
type AlertManager struct {
|
||||
slackWebhook string
|
||||
emailSMTP string
|
||||
thresholds AlertThresholds
|
||||
alertState map[string]time.Time
|
||||
mu sync.Mutex
|
||||
}
|
||||
|
||||
type AlertThresholds struct {
|
||||
ErrorRatePercent float64 // Alert if >10%
|
||||
RPCFailuresPerMin int // Alert if >100/min
|
||||
ZeroAddressesPerHour int // Alert if >10/hour
|
||||
NoOpportunitiesHours int // Alert if no opps for N hours
|
||||
}
|
||||
|
||||
func (am *AlertManager) CheckAndAlert(metrics *SystemMetrics) {
|
||||
am.mu.Lock()
|
||||
defer am.mu.Unlock()
|
||||
|
||||
// Error rate alert
|
||||
if metrics.ErrorRate > am.thresholds.ErrorRatePercent {
|
||||
if am.shouldAlert("high_error_rate", 5*time.Minute) {
|
||||
am.sendAlert("🚨 HIGH ERROR RATE", fmt.Sprintf(
|
||||
"Error rate: %.2f%% (threshold: %.2f%%)\nTotal errors: %d",
|
||||
metrics.ErrorRate, am.thresholds.ErrorRatePercent, metrics.TotalErrors,
|
||||
))
|
||||
}
|
||||
}
|
||||
|
||||
// RPC failure alert
|
||||
rpcFailuresPerMin := metrics.RPCFailures / int(time.Since(metrics.StartTime).Minutes())
|
||||
if rpcFailuresPerMin > am.thresholds.RPCFailuresPerMin {
|
||||
if am.shouldAlert("rpc_failures", 10*time.Minute) {
|
||||
am.sendAlert("⚠️ RPC FAILURES", fmt.Sprintf(
|
||||
"RPC failures: %d/min (threshold: %d/min)\nCheck RPC providers and rate limits",
|
||||
rpcFailuresPerMin, am.thresholds.RPCFailuresPerMin,
|
||||
))
|
||||
}
|
||||
}
|
||||
|
||||
// Zero address alert
|
||||
if metrics.ZeroAddressesLastHour > am.thresholds.ZeroAddressesPerHour {
|
||||
if am.shouldAlert("zero_addresses", 1*time.Hour) {
|
||||
am.sendAlert("❌ ZERO ADDRESS CONTAMINATION", fmt.Sprintf(
|
||||
"Zero addresses detected: %d in last hour\nData integrity compromised",
|
||||
metrics.ZeroAddressesLastHour,
|
||||
))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (am *AlertManager) shouldAlert(alertType string, cooldown time.Duration) bool {
|
||||
lastAlert, exists := am.alertState[alertType]
|
||||
if !exists || time.Since(lastAlert) > cooldown {
|
||||
am.alertState[alertType] = time.Now()
|
||||
return true
|
||||
}
|
||||
return false
|
||||
}
|
||||
```
|
||||
|
||||
### Improvement 3: Enhanced Logging with Context
|
||||
|
||||
**File**: All files using logging
|
||||
|
||||
**Current**:
|
||||
```go
|
||||
log.Printf("[ERROR] Failed to get pool data: %v", err)
|
||||
```
|
||||
|
||||
**Enhanced**:
|
||||
```go
|
||||
import "log/slog"
|
||||
|
||||
logger := slog.With(
|
||||
"component", "pool_fetcher",
|
||||
"pool", poolAddress.Hex(),
|
||||
"block", blockNumber,
|
||||
)
|
||||
|
||||
logger.Error("failed to get pool data",
|
||||
"error", err,
|
||||
"attempt", attempt,
|
||||
"rpc_endpoint", currentEndpoint,
|
||||
)
|
||||
```
|
||||
|
||||
**Benefits**:
|
||||
- Structured logging for easy parsing
|
||||
- Automatic context propagation
|
||||
- Better filtering and analysis
|
||||
- JSON output for log aggregation
|
||||
|
||||
## 📊 MONITORING & VALIDATION
|
||||
|
||||
### Validation Checklist
|
||||
|
||||
After implementing fixes, validate each with:
|
||||
|
||||
```bash
|
||||
# 1. WebSocket Connection Fix
|
||||
✅ No "unsupported protocol scheme wss" errors in logs
|
||||
✅ Successful WebSocket connection messages
|
||||
✅ Block subscription working
|
||||
|
||||
# 2. Zero Address Fix
|
||||
✅ No zero addresses in liquidity_events_*.jsonl
|
||||
✅ Valid token addresses in all events
|
||||
✅ Factory addresses are non-zero
|
||||
|
||||
# 3. Rate Limiting Fix
|
||||
✅ "Too Many Requests" errors reduced by >90%
|
||||
✅ Successful RPC calls >95%
|
||||
✅ Automatic backoff observable in logs
|
||||
|
||||
# 4. Connection Manager Fix
|
||||
✅ Automatic provider failover working
|
||||
✅ Health checks passing
|
||||
✅ All providers being utilized
|
||||
|
||||
# 5. Health Scoring Fix
|
||||
✅ Health score reflects actual system state
|
||||
✅ Score <80 when errors >20%
|
||||
✅ Alerts triggering at correct thresholds
|
||||
```
|
||||
|
||||
### Performance Metrics to Track
|
||||
|
||||
**Before Fixes**:
|
||||
- Error Rate: 81.1%
|
||||
- RPC Failures: 100,709
|
||||
- Zero Addresses: 5,462
|
||||
- Successful Arbitrages: 0
|
||||
- Opportunities Rejected: 100%
|
||||
|
||||
**Target After Fixes**:
|
||||
- Error Rate: <5%
|
||||
- RPC Failures: <100/day
|
||||
- Zero Addresses: 0
|
||||
- Successful Arbitrages: >0
|
||||
- Opportunities Rejected: <80%
|
||||
|
||||
### Test Commands
|
||||
|
||||
```bash
|
||||
# Comprehensive system test
|
||||
./scripts/comprehensive-test.sh
|
||||
|
||||
# Individual component tests
|
||||
go test ./pkg/arbitrum/... -v
|
||||
go test ./pkg/arbitrage/... -v
|
||||
go test ./pkg/monitor/... -v
|
||||
|
||||
# Integration test with real data
|
||||
LOG_LEVEL=debug timeout 60 ./mev-bot start 2>&1 | tee test-run.log
|
||||
|
||||
# Analyze test run
|
||||
./scripts/log-manager.sh analyze
|
||||
./scripts/log-manager.sh health
|
||||
```
|
||||
|
||||
## 🎯 IMPLEMENTATION ROADMAP
|
||||
|
||||
### Day 1 (Hours 0-24)
|
||||
- [ ] Fix WebSocket connection (2 hours)
|
||||
- [ ] Fix zero address parsing (3 hours)
|
||||
- [ ] Implement basic rate limiting (2 hours)
|
||||
- [ ] Fix health scoring script (1 hour)
|
||||
- [ ] Test and validate (2 hours)
|
||||
- [ ] Deploy to staging (1 hour)
|
||||
|
||||
### Day 2 (Hours 24-48)
|
||||
- [ ] Enhanced connection manager (4 hours)
|
||||
- [ ] Fix port conflicts (1 hour)
|
||||
- [ ] Add multiple RPC providers (2 hours)
|
||||
- [ ] Implement request caching (3 hours)
|
||||
- [ ] Full system testing (2 hours)
|
||||
|
||||
### Day 3 (Hours 48-72)
|
||||
- [ ] Batch RPC requests (3 hours)
|
||||
- [ ] Improve profit calculation (2 hours)
|
||||
- [ ] Add real-time alerting (2 hours)
|
||||
- [ ] Enhanced logging (2 hours)
|
||||
- [ ] Production deployment (3 hours)
|
||||
|
||||
### Week 1 (Days 4-7)
|
||||
- [ ] Log rotation automation
|
||||
- [ ] Monitoring dashboard improvements
|
||||
- [ ] Performance optimization
|
||||
- [ ] Documentation updates
|
||||
- [ ] Team training on new systems
|
||||
|
||||
## 🔒 RISK MITIGATION
|
||||
|
||||
### Deployment Risks
|
||||
|
||||
| Risk | Probability | Impact | Mitigation |
|
||||
|------|------------|--------|------------|
|
||||
| WebSocket fix breaks HTTP fallback | Medium | High | Keep HTTP client as fallback |
|
||||
| Rate limiting too aggressive | Medium | Medium | Make limits configurable |
|
||||
| Cache serves stale data | Low | Medium | Add cache invalidation on errors |
|
||||
| New errors introduced | Medium | High | Comprehensive testing + rollback plan |
|
||||
|
||||
### Rollback Plan
|
||||
|
||||
If issues occur after deployment:
|
||||
|
||||
```bash
|
||||
# Quick rollback
|
||||
git revert HEAD
|
||||
make build
|
||||
systemctl restart mev-bot
|
||||
|
||||
# Restore from backup
|
||||
cp backups/mev-bot-backup-YYYYMMDD ./mev-bot
|
||||
systemctl restart mev-bot
|
||||
|
||||
# Check rollback success
|
||||
./scripts/log-manager.sh status
|
||||
tail -f logs/mev_bot.log
|
||||
```
|
||||
|
||||
### Gradual Rollout
|
||||
|
||||
1. **Staging** (Day 1): Deploy all fixes, test for 24 hours
|
||||
2. **Canary** (Day 2): Deploy to 10% of production capacity
|
||||
3. **Production** (Day 3): Full production deployment
|
||||
4. **Monitoring** (Week 1): Intensive monitoring and tuning
|
||||
|
||||
## 📚 ADDITIONAL RESOURCES
|
||||
|
||||
### Documentation to Update
|
||||
- [ ] CLAUDE.md - Add new configuration requirements
|
||||
- [ ] README.md - Update deployment instructions
|
||||
- [ ] TODO_AUDIT_FIX.md - Mark completed items
|
||||
- [ ] API.md - Document new monitoring endpoints
|
||||
|
||||
### Code Reviews Required
|
||||
- WebSocket connection changes
|
||||
- Zero address validation logic
|
||||
- Rate limiting implementation
|
||||
- Connection manager enhancements
|
||||
|
||||
### Testing Requirements
|
||||
- Unit tests for all new functions
|
||||
- Integration tests for RPC connections
|
||||
- Load testing for rate limiting
|
||||
- End-to-end arbitrage execution test
|
||||
|
||||
---
|
||||
|
||||
**Document Version**: 1.0
|
||||
**Last Updated**: 2025-10-30
|
||||
**Review Required**: After each fix implementation
|
||||
**Owner**: MEV Bot Development Team
|
||||
Reference in New Issue
Block a user