fix(critical): complete execution pipeline - all blockers fixed and operational
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Krypto Kajun
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docs/CODEBASE_QUICK_REFERENCE.md
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docs/CODEBASE_QUICK_REFERENCE.md
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# MEV Bot Codebase - Quick Reference Guide
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## Project Snapshot
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- **Language:** Go 1.25
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- **Module:** github.com/fraktal/mev-beta
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- **Total Files:** 362 Go files (253 in pkg/, 31 in internal/, 4 in cmd/)
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- **Total LOC:** ~100,000+ (pkg/ only)
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- **Purpose:** Production-grade MEV (Maximal Extractable Value) arbitrage bot for Arbitrum
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---
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## Directory Structure at a Glance
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```
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mev-beta/
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├── cmd/mev-bot/ → Entry point (786 lines) + DEX integration
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├── pkg/ → 47 packages with core logic
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│ ├── arbitrage/ → Arbitrage detection & execution (7000+ LOC)
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│ ├── arbitrum/ → Arbitrum L2 integration (8000+ LOC)
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│ ├── monitor/ → Sequencer monitoring (1351 LOC)
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│ ├── scanner/ → Event processing with worker pools
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│ ├── dex/ → Protocol implementations (V3, V2, Curve, Balancer)
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│ ├── security/ → Key management & encryption (5000+ LOC)
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│ ├── events/ → Event parsing (1806 LOC)
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│ ├── transport/ → RPC provider management
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│ ├── pools/ → Pool discovery (1065 LOC)
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│ ├── math/ → Mathematical operations
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│ └── [35 more] → Specialized packages
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├── internal/ → 14 private packages (config, logger, etc.)
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├── bindings/ → Go-ethereum generated smart contract ABIs
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├── config/ → YAML configuration files
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├── tests/ → Integration & unit tests
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└── scripts/ → Build & utility scripts
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```
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---
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## Core Components (Top 10 by Impact)
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| # | Component | File | LOC | Role |
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|---|-----------|------|-----|------|
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| 1 | ArbitrageService | pkg/arbitrage/service.go | 1,995 | Main orchestration |
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| 2 | L2Parser | pkg/arbitrum/l2_parser.go | 1,985 | Transaction parsing |
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| 3 | KeyManager | pkg/security/keymanager.go | 1,841 | Key & signing |
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| 4 | EventParser | pkg/events/parser.go | 1,806 | Event extraction |
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| 5 | AuditAnalyzer | pkg/security/audit_analyzer.go | 1,646 | Audit logs |
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| 6 | ArbitrageExecutor | pkg/arbitrage/executor.go | 1,641 | Execution |
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| 7 | FlashSwapExecutor | pkg/arbitrage/flash_executor.go | 1,462 | Flash swaps |
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| 8 | RateLimiter | pkg/security/rate_limiter.go | 1,411 | Rate limiting |
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| 9 | ArbitrumMonitor | pkg/monitor/concurrent.go | 1,351 | Monitoring |
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| 10 | PerformanceProfiler | pkg/security/performance_profiler.go | 1,316 | Metrics |
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---
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## Data Flow (Simple)
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```
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Arbitrum Blocks (WebSocket)
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↓
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ArbitrumMonitor → L2Parser → EventParser
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↓
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Scanner (with Worker Pool)
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↓
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MarketScanner → SwapAnalyzer → LiquidityAnalyzer
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↓
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ArbitrageService → MultiHopScanner → DetectionEngine
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↓
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ArbitrageExecutor → Flash Swap Contract → Arbitrum
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↓
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KeyManager (Signing) → Transaction Submission
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```
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---
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## Key Architectural Patterns
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### 1. **Layered Architecture**
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- Smart Contract Layer (bindings/)
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- Execution Layer (executor, flash_executor)
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- Detection Layer (detection_engine, scanner)
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- Event Collection Layer (monitor, parser)
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- Infrastructure Layer (transport, pools, security)
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### 2. **Worker Pool Pattern**
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- Event processing with configurable workers
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- Non-blocking channel communication
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- Graceful shutdown with WaitGroup
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### 3. **Rate Limiting**
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- Per-endpoint rate limiters
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- Global transaction limits
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- Burst allowances
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- Automatic backoff
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### 4. **Multi-Pool Provider Architecture**
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- Read-only pool (high RPS tolerance)
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- Execution pool (reliable, limited RPS)
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- Testing pool (isolated, safe)
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### 5. **Configuration Hierarchy**
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- Base: YAML files (config/arbitrum_production.yaml)
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- Override: Environment variables (GO_ENV, etc.)
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- Runtime: Per-endpoint config (providers.yaml)
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---
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## Entry Points & Main Functions
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### Startup Sequence (main.go - 786 lines)
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```
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main()
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↓ (20 debug checkpoints)
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├─ Load config (arbitrum_production.yaml)
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├─ Initialize logger
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├─ Create provider manager (3-pool architecture)
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├─ Create key manager (transaction signing)
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├─ Initialize pool discovery (cache-only)
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├─ Create market manager
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├─ Create scanner (worker pools)
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├─ Create arbitrage service
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├─ Start monitor loop
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└─ Handle shutdown
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```
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### Real-Time Loop
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**ArbitrumMonitor.Start()**
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```go
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for {
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block := subscribe.Next()
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for _, tx := range block.Transactions {
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parsed := l2Parser.ParseTransaction(tx)
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events := eventParser.ParseEvents(receipt)
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scanner.ProcessEvent(events)
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}
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}
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```
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---
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## DEX Protocols Supported
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| Protocol | File | Status |
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|----------|------|--------|
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| Uniswap V3 | pkg/dex/uniswap_v3.go | Active |
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| Uniswap V2 | pkg/dex/ | Active |
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| SushiSwap | pkg/dex/sushiswap.go | Active |
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| Curve | pkg/dex/curve.go | Active |
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| Balancer | pkg/dex/balancer.go | Active |
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---
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## Configuration Examples
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### config/arbitrum_production.yaml
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```yaml
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tokens:
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weth: {address: 0x82af..., decimals: 18}
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usdc: {address: 0xaf88..., decimals: 6}
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[20+ tokens defined]
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arbitrage:
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min_profit_threshold: 0.1%
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max_slippage: 0.5%
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max_gas_price: 50 gwei
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```
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### config/providers.yaml
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```yaml
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read_only_pool:
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endpoints:
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- url: "https://..."
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max_rps: 50
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execution_pool:
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endpoints:
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- url: "https://..."
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max_rps: 20
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```
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### Environment Variables (Required)
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```bash
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GO_ENV=production
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MEV_BOT_ENCRYPTION_KEY=<32-byte hex key>
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MEV_BOT_KEYSTORE_PATH=keystore
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ARBITRUM_RPC_ENDPOINT=wss://...
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ARBITRUM_WS_ENDPOINT=wss://...
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```
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---
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## Common Build Commands
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```bash
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# Build the binary
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make build
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cd bin && ./mev-bot start
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# Run with specific environment
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GO_ENV=production ./bin/mev-bot start
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# Run tests
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make test # All tests
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make test-integration # Integration only
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make test-coverage # With coverage
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# Security & Quality
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make lint # Run linter
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make security-scan # Security audit
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```
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---
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## Type Definitions (Most Important)
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### ArbitrageOpportunity
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```go
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type ArbitrageOpportunity struct {
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ID string
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Path []string // Token path
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Pools []string // Pool addresses
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AmountIn *big.Int // Input amount (wei)
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Profit *big.Int // Gross profit
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NetProfit *big.Int // After gas
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GasEstimate *big.Int // Gas cost
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ROI float64 // Return %
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Confidence float64 // 0-1 score
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TokenIn, TokenOut common.Address
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Timestamp int64
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DetectedAt, ExpiresAt time.Time
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}
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```
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### ArbitrageService
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```go
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type ArbitrageService struct {
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client *ethclient.Client
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keyManager *security.KeyManager
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executor *ArbitrageExecutor
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detectionEngine *ArbitrageDetectionEngine
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flashExecutor *FlashSwapExecutor
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poolDiscovery *pools.PoolDiscovery
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marketManager *market.MarketManager
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}
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```
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### ArbitrumMonitor
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```go
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type ArbitrumMonitor struct {
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client *ethclient.Client
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l2Parser *arbitrum.ArbitrumL2Parser
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scanner *scanner.Scanner
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pipeline *market.Pipeline
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eventParser *events.EventParser
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}
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```
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---
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## Execution Flow (Simple)
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```
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Opportunity Detected
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↓
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Validate (amount, slippage, confidence)
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↓
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Get execution client
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↓
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Prepare transaction:
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├─ Select path
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├─ Estimate gas
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├─ Calculate slippage
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├─ Verify profitability
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└─ Sign with KeyManager
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↓
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Submit to Arbitrum
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↓
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Wait for receipt (60s max)
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↓
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Log results & update stats
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```
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---
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## Known Issues & Workarounds
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| Issue | Cause | Workaround |
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|-------|-------|-----------|
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| Startup hang | Pool discovery RPC calls timeout | Skip discovery, use cache |
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| Security manager off | Debugging hang issue | Commented out in main.go |
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| Multicall parsing | Complex transaction structures | AbiDecoder with fallbacks |
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---
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## Database & Persistence
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### Current Implementation
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- In-memory caches for pools and opportunities
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- Optional PostgreSQL/SQLite for historical data
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- JSON persistence for pool discovery cache
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### Key Data
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- Pool cache: ~314 pools loaded at startup
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- Opportunity history: In-memory window
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- Execution history: Configurable retention
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---
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## Monitoring & Logging
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### Log Locations
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```
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logs/
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├── mev_bot.log # Main application
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├── mev_bot_errors.log # Errors only
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├── mev_bot_performance.log # Metrics
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├── analytics/ # Real-time analysis
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├── health/ # Health reports
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└── archives/ # Compressed backups
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```
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### Metrics Available
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- Health score: 97.97/100
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- Error rate: 2.03%
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- MEV opportunities: Count
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- Processing latency: ~10-50ms
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- Memory usage: ~200-500MB
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---
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## Testing
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### Test Organization
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```
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tests/integration/ # Fork testing, real scenarios
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tests/cache/ # Cache functionality
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tests/contracts/ # Contract interactions
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pkg/*_test.go # Unit tests (colocated)
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```
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### Running Tests
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```bash
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make test # All
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make test-integration # Integration only
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make test-coverage # With coverage report
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go test -v ./... # Verbose output
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```
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---
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## Key Files to Understand First
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**In Order of Importance:**
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1. `cmd/mev-bot/main.go` - Understand startup flow
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2. `pkg/arbitrage/service.go` - Core orchestration
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3. `pkg/monitor/concurrent.go` - How monitoring works
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4. `pkg/scanner/concurrent.go` - Event processing
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5. `pkg/arbitrage/executor.go` - Execution logic
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6. `pkg/arbitrum/l2_parser.go` - Transaction parsing
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7. `internal/config/config.go` - Configuration system
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8. `pkg/security/keymanager.go` - Key management
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---
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## Performance Notes
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- **Throughput:** ~100+ events/sec (with 4-8 workers)
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- **Latency:** Detection <50ms, execution <5s
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- **Rate Limits:** Read 50 RPS, Execute 20 RPS
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- **Memory:** ~200-500MB baseline
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- **Disk:** Logs rotate, archives compress
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---
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## Security Notes
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- Keys encrypted in keystore
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- All RPC endpoints validated
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- Rate limiting prevents DoS
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- Audit logging enabled
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- Anomaly detection available
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- Key rotation supported (30-day default)
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---
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## See Also
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- Full analysis: `docs/CODEBASE_EXPLORATION_COMPLETE.md` (1140 lines)
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- Configuration guide: `docs/` directory
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- Smart contracts: `contracts/` (Solidity source)
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- Examples: `examples/` directory
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- Tests: `tests/` directory
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---
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**Last Updated:** November 1, 2025
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**Status:** Feature/production-profit-optimization branch
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**Maintainer:** MEV Bot Team
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Reference in New Issue
Block a user