Implement handlePutUpload function for regular PUT uploads with HMAC and JWT authentication
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STABILITY_AUDIT_PLAN.md
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STABILITY_AUDIT_PLAN.md
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# HMAC File Server 3.2 - Stability & Reliability Audit Plan
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## 🎯 Objective
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Comprehensive code audit focused on **STABILITY** and **RELIABILITY** without rewriting core functions. Identify potential issues that could cause crashes, data loss, memory leaks, race conditions, or degraded performance.
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---
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## 📋 Audit Categories
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### 1. **CONCURRENCY & THREAD SAFETY** 🔄
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**Priority: CRITICAL**
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#### Areas to Check:
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- [ ] **Mutex Usage Patterns**
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- `confMutex` (main.go:332) - Global config protection
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- `spilloverMutex` (queue_resilience.go:18) - Queue operations
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- `healthMutex` (queue_resilience.go:40) - Health monitoring
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- `logMu` (main.go:378) - Logging synchronization
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#### Specific Checks:
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- [ ] **Lock Ordering** - Prevent deadlocks between multiple mutexes
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- [ ] **Lock Duration** - Ensure locks aren't held too long
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- [ ] **Read vs Write Locks** - Verify appropriate RWMutex usage
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- [ ] **Defer Patterns** - Check all `defer mutex.Unlock()` calls
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- [ ] **Channel Operations** - Network event channels, upload queues
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- [ ] **Goroutine Lifecycle** - Worker pools, monitoring routines
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#### Files to Audit:
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- `main.go` (lines around 300, 332, 378, 822)
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- `queue_resilience.go` (mutex operations throughout)
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- `network_resilience.go` (concurrent monitoring)
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- `upload_session.go` (session management)
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---
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### 2. **ERROR HANDLING & RECOVERY** ⚠️
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**Priority: HIGH**
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#### Areas to Check:
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- [ ] **Fatal Error Conditions** - Review all `log.Fatal*` calls
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- [ ] **Panic Recovery** - Missing recover() handlers
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- [ ] **Error Propagation** - Proper error bubbling up
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- [ ] **Resource Cleanup** - Ensure cleanup on errors
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- [ ] **Graceful Degradation** - Fallback mechanisms
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#### Critical Fatal Points:
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- `main.go:572` - Config creation failure
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- `main.go:577` - Configuration load failure
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- `main.go:585` - Validation failure
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- `main.go:625` - Configuration errors
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- `main.go:680` - PID file errors
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- `helpers.go:97` - MinFreeBytes parsing
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- `helpers.go:117` - TTL configuration
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#### Error Patterns to Check:
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- [ ] Database connection failures
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- [ ] File system errors (disk full, permissions)
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- [ ] Network timeouts and failures
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- [ ] Memory allocation failures
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- [ ] Configuration reload errors
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---
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### 3. **RESOURCE MANAGEMENT** 💾
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**Priority: HIGH**
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#### Areas to Check:
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- [ ] **File Handle Management**
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- Verify all `defer file.Close()` calls
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- Check for file handle leaks
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- Monitor temp file cleanup
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- [ ] **Memory Management**
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- Buffer pool usage (`bufferPool` in main.go:363)
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- Large file upload handling
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- Memory leak patterns in long-running operations
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- [ ] **Network Connections**
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- HTTP connection pooling
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- Client session tracking
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- Connection timeout handling
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- [ ] **Goroutine Management**
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- Worker pool lifecycle
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- Background task cleanup
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- WaitGroup usage patterns
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#### Files to Focus:
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- `main.go` (buffer pools, file operations)
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- `helpers.go` (file operations, defer patterns)
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- `upload_session.go` (session cleanup)
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- `adaptive_io.go` (large file handling)
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---
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### 4. **CONFIGURATION & INITIALIZATION** ⚙️
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**Priority: MEDIUM**
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#### Areas to Check:
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- [ ] **Default Values** - Ensure safe defaults
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- [ ] **Validation Logic** - Prevent invalid configurations
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- [ ] **Runtime Reconfiguration** - Hot reload safety
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- [ ] **Missing Required Fields** - Graceful handling
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- [ ] **Type Safety** - String to numeric conversions
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#### Configuration Files:
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- `config_simplified.go` - Default generation
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- `config_validator.go` - Validation rules
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- `config_test_scenarios.go` - Edge cases
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#### Validation Points:
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- Network timeouts and limits
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- File size restrictions
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- Path validation and sanitization
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- Security parameter validation
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---
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### 5. **NETWORK RESILIENCE STABILITY** 🌐
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**Priority: HIGH** (Recently added features)
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#### Areas to Check:
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- [ ] **Network Monitoring Loops** - Prevent infinite loops
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- [ ] **Interface Detection** - Handle missing interfaces gracefully
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- [ ] **Quality Metrics** - Prevent division by zero
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- [ ] **State Transitions** - Ensure atomic state changes
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- [ ] **Timer Management** - Prevent timer leaks
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#### Files to Audit:
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- `network_resilience.go` - Core network monitoring
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- `client_network_handler.go` - Client session tracking
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- `integration.go` - System integration points
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#### Specific Concerns:
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- Network interface enumeration failures
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- RTT measurement edge cases
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- Quality threshold calculations
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- Predictive switching logic
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---
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### 6. **UPLOAD PROCESSING STABILITY** 📤
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**Priority: HIGH**
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#### Areas to Check:
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- [ ] **Chunked Upload Sessions** - Session state consistency
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- [ ] **File Assembly** - Partial upload handling
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- [ ] **Temporary File Management** - Cleanup on failures
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- [ ] **Concurrent Uploads** - Rate limiting effectiveness
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- [ ] **Storage Quota Enforcement** - Disk space checks
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#### Files to Audit:
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- `chunked_upload_handler.go` - Session management
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- `upload_session.go` - State tracking
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- `main.go` - Core upload logic
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- `helpers.go` - File operations
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#### Edge Cases:
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- Disk full during upload
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- Network interruption mid-upload
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- Client disconnect scenarios
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- Large file timeout handling
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---
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### 7. **LOGGING & MONITORING RELIABILITY** 📊
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**Priority: MEDIUM**
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#### Areas to Check:
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- [ ] **Log File Rotation** - Prevent disk space issues
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- [ ] **Metrics Collection** - Avoid blocking operations
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- [ ] **Debug Logging** - Performance impact in production
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- [ ] **Log Level Changes** - Runtime safety
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- [ ] **Structured Logging** - Consistency and safety
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#### Files to Audit:
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- `helpers.go` (logging setup)
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- `main.go` (debug statements)
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- Metrics initialization and collection
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---
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### 8. **EXTERNAL DEPENDENCIES** 🔗
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**Priority: MEDIUM**
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#### Areas to Check:
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- [ ] **Database Connections** - Connection pooling and timeouts
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- [ ] **Redis Integration** - Failure handling
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- [ ] **File System Operations** - Permission and space checks
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- [ ] **System Calls** - Error handling
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- [ ] **Third-party Libraries** - Version compatibility
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---
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## 🔍 Audit Methodology
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### Phase 1: **Static Code Analysis** (2-3 hours)
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1. **Concurrency Pattern Review** - Mutex usage, race conditions
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2. **Error Handling Audit** - Fatal conditions, recovery patterns
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3. **Resource Leak Detection** - File handles, memory, goroutines
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4. **Configuration Safety** - Validation and defaults
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### Phase 2: **Dynamic Analysis Preparation** (1-2 hours)
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1. **Test Scenario Design** - Edge cases and failure modes
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2. **Monitoring Setup** - Memory, CPU, file handles
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3. **Load Testing Preparation** - Concurrent upload scenarios
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4. **Network Failure Simulation** - Interface switching tests
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### Phase 3: **Code Pattern Verification** (2-3 hours)
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1. **TODO/FIXME Review** - Incomplete implementations
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2. **Debug Code Cleanup** - Production-ready logging
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3. **Performance Bottleneck Analysis** - Blocking operations
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4. **Security Pattern Review** - Input validation, path traversal
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---
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## 🚨 High-Risk Areas Identified
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### 1. **Multiple Fatal Conditions** (main.go)
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- Configuration failures cause immediate exit
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- No graceful degradation for non-critical failures
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### 2. **Complex Mutex Hierarchies** (queue_resilience.go)
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- Multiple mutexes could create deadlock scenarios
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- Lock duration analysis needed
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### 3. **Network Monitoring Loops** (network_resilience.go)
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- Background goroutines with complex state management
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- Timer and resource cleanup verification needed
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### 4. **File Handle Management** (throughout)
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- Multiple file operations without centralized tracking
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- Temp file cleanup verification needed
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### 5. **Buffer Pool Usage** (main.go)
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- Memory management in high-concurrency scenarios
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- Pool exhaustion handling
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---
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## 📈 Success Criteria
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### ✅ **Stability Improvements**
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- No race conditions detected
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- Proper resource cleanup verified
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- Graceful error handling confirmed
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- Memory leak prevention validated
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### ✅ **Reliability Enhancements**
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- Fault tolerance for external dependencies
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- Robust configuration validation
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- Comprehensive error recovery
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- Production-ready logging
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### ✅ **Performance Assurance**
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- No blocking operations in critical paths
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- Efficient resource utilization
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- Proper cleanup and garbage collection
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- Scalable concurrency patterns
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---
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## 🔧 Tools and Techniques
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1. **Static Analysis**
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- `go vet` - Built-in Go analyzer
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- `golangci-lint` - Comprehensive linting
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- Manual code review with focus areas
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2. **Race Detection**
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- `go build -race` - Runtime race detector
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- Concurrent test scenarios
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3. **Memory Analysis**
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- `go tool pprof` - Memory profiling
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- Long-running stability tests
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4. **Resource Monitoring**
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- File handle tracking
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- Goroutine leak detection
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- Network connection monitoring
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---
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## 📝 Deliverables
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1. **Stability Audit Report** - Detailed findings and recommendations
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2. **Code Improvement Patches** - Non-invasive fixes for identified issues
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3. **Test Suite Enhancements** - Edge case and failure mode tests
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4. **Production Monitoring Guide** - Key metrics and alerts
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5. **Deployment Safety Checklist** - Pre-deployment verification steps
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---
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*This audit plan prioritizes stability and reliability while respecting the core architecture and avoiding rewrites of essential functions.*
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