Advanced Kiro Hooks Techniques

// .kiro/hooks/base/resilient-hook.js
class ResilientHook {
  constructor(config) {
    this.config = config;
    this.retryPolicy = config.retryPolicy || defaultRetryPolicy;
    this.circuitBreaker = new CircuitBreaker(config.circuitBreaker);
    this.metrics = new HookMetrics(config.name);
  }
  
  async execute(context) {
    const startTime = Date.now();
    let attempt = 0;
    
    while (attempt < this.retryPolicy.maxAttempts) {
      try {
        // Check circuit breaker
        if (this.circuitBreaker.isOpen()) {
          throw new CircuitBreakerOpenError();
        }
        
        // Execute hook logic with timeout
        const result = await Promise.race([
          this.executeHookLogic(context),
          this.createTimeout(this.config.timeout)
        ]);
        
        // Success - update metrics and return
        this.metrics.recordSuccess(Date.now() - startTime);
        this.circuitBreaker.recordSuccess();
        
        return result;
        
      } catch (error) {
        attempt++;
        this.metrics.recordError(error);
        this.circuitBreaker.recordFailure();
        
        // Determine if error is retryable
        if (!this.isRetryableError(error) || attempt >= this.retryPolicy.maxAttempts) {
          await this.handleFinalFailure(error, context, attempt);
          throw error;
        }
        
        // Wait before retry with exponential backoff
        const delay = this.calculateBackoffDelay(attempt);
        await this.wait(delay);
      }
    }
  }
  
  async handleFinalFailure(error, context, attempts) {
    // Log failure details
    await this.logFailure({
      error,
      context,
      attempts,
      hookName: this.config.name,
      timestamp: new Date().toISOString()
    });
    
    // Trigger fallback behavior if configured
    if (this.config.fallback) {
      try {
        await this.config.fallback(error, context);
      } catch (fallbackError) {
        console.error('Fallback failed:', fallbackError);
      }
    }
    
    // Notify monitoring systems
    await this.notifyFailure({
      hookName: this.config.name,
      error: error.message,
      context: this.sanitizeContext(context)
    });
  }
  
  isRetryableError(error) {
    // Network errors, timeouts, and temporary service unavailability are retryable
    return error.code === 'NETWORK_ERROR' ||
           error.code === 'TIMEOUT' ||
           error.code === 'SERVICE_UNAVAILABLE' ||
           (error.status >= 500 && error.status < 600);
  }
  
  calculateBackoffDelay(attempt) {
    const baseDelay = this.retryPolicy.baseDelay || 1000;
    const maxDelay = this.retryPolicy.maxDelay || 30000;
    
    // Exponential backoff with jitter
    const exponentialDelay = baseDelay * Math.pow(2, attempt - 1);
    const jitter = Math.random() * 0.1 * exponentialDelay;
    
    return Math.min(exponentialDelay + jitter, maxDelay);
  }
}

// .kiro/hooks/utils/intelligent-cache.js
class IntelligentCache {
  constructor(config) {
    this.config = config;
    this.cache = new Map();
    this.hitRates = new Map();
    this.accessPatterns = new Map();
  }
  
  async get(key, contextAnalysis) {
    // Analyze access pattern
    this.recordAccess(key, contextAnalysis);
    
    const cached = this.cache.get(key);
    if (cached && this.isValid(cached, contextAnalysis)) {
      this.recordHit(key);
      return cached.value;
    }
    
    this.recordMiss(key);
    return null;
  }
  
  async set(key, value, contextAnalysis) {
    const metadata = {
      value,
      timestamp: Date.now(),
      contextHash: this.hashContext(contextAnalysis),
      accessCount: 0,
      lastAccess: Date.now(),
      dependencies: this.extractDependencies(contextAnalysis)
    };
    
    this.cache.set(key, metadata);
    
    // Intelligent eviction based on usage patterns
    await this.manageCache();
  }
  
  isValid(cached, contextAnalysis) {
    const age = Date.now() - cached.timestamp;
    const maxAge = this.calculateMaxAge(cached, contextAnalysis);
    
    if (age > maxAge) return false;
    
    // Check if dependencies have changed
    return !this.dependenciesChanged(cached.dependencies, contextAnalysis);
  }
  
  calculateMaxAge(cached, contextAnalysis) {
    const baseMaxAge = this.config.defaultTTL || 3600000; // 1 hour
    
    // Adjust based on access patterns
    const accessFrequency = this.getAccessFrequency(cached);
    const contextStability = this.getContextStability(contextAnalysis);
    
    // More frequently accessed and stable contexts can be cached longer
    return baseMaxAge * accessFrequency * contextStability;
  }
  
  async manageCache() {
    if (this.cache.size <= this.config.maxSize) return;
    
    // Calculate eviction scores
    const entries = Array.from(this.cache.entries()).map(([key, value]) => ({
      key,
      value,
      score: this.calculateEvictionScore(key, value)
    }));
    
    // Sort by eviction score (higher = more likely to evict)
    entries.sort((a, b) => b.score - a.score);
    
    // Evict lowest scoring entries
    const toEvict = entries.slice(0, entries.length - this.config.maxSize + 1);
    toEvict.forEach(entry => this.cache.delete(entry.key));
  }
}

// .kiro/hooks/utils/parallel-processor.js
class ResourceAwareProcessor {
  constructor(config) {
    this.config = config;
    this.activeJobs = new Map();
    this.resourceMonitor = new ResourceMonitor();
  }
  
  async processInParallel(tasks, context) {
    const availableResources = await this.resourceMonitor.getAvailableResources();
    const optimalConcurrency = this.calculateOptimalConcurrency(
      tasks,
      availableResources,
      context
    );
    
    // Create task batches based on dependencies and resource requirements
    const batches = await this.createTaskBatches(tasks, optimalConcurrency);
    
    const results = [];
    
    for (const batch of batches) {
      // Process batch with dynamic resource allocation
      const batchResults = await Promise.allSettled(
        batch.map(task => this.processTask(task, availableResources))
      );
      
      results.push(...batchResults);
      
      // Adjust resource allocation based on performance
      await this.adjustResourceAllocation(batchResults, availableResources);
    }
    
    return results;
  }
  
  calculateOptimalConcurrency(tasks, resources, context) {
    const cpuIntensiveTasks = tasks.filter(t => t.type === 'cpu-intensive').length;
    const ioIntensiveTasks = tasks.filter(t => t.type === 'io-intensive').length;
    const memoryIntensiveTasks = tasks.filter(t => t.type === 'memory-intensive').length;
    
    // Calculate based on resource availability and task characteristics
    const cpuConcurrency = Math.min(cpuIntensiveTasks, resources.availableCPUs);
    const ioConcurrency = Math.min(ioIntensiveTasks, resources.ioCapacity);
    const memoryConcurrency = Math.floor(resources.availableMemory / 
                                      this.config.averageMemoryPerTask);
    
    // Consider system load and development environment impact
    const systemLoadFactor = 1 - resources.systemLoad;
    const devEnvironmentFactor = context.isDevelopmentTime ? 0.7 : 1.0;
    
    return Math.floor(
      Math.min(cpuConcurrency, ioConcurrency, memoryConcurrency) *
      systemLoadFactor * 
      devEnvironmentFactor
    );
  }
}

// .kiro/hooks/security/secure-executor.js
class SecureHookExecutor {
  constructor(config) {
    this.config = config;
    this.auditLogger = new AuditLogger();
    this.accessController = new AccessController();
    this.dataProtector = new DataProtector();
  }
  
  async executeHook(hookConfig, context) {
    // Validate hook permissions
    const permissions = await this.accessController.validatePermissions(
      hookConfig.permissions,
      context.user,
      context.project
    );
    
    if (!permissions.isValid) {
      throw new PermissionDeniedError(permissions.violations);
    }
    
    // Sanitize and protect sensitive data
    const sanitizedContext = await this.dataProtector.sanitizeContext(context);
    
    // Create secure execution environment
    const executionEnv = await this.createSecureEnvironment({
      permissions: permissions.granted,
      resourceLimits: hookConfig.resourceLimits,
      networkAccess: hookConfig.networkAccess,
      fileSystemAccess: hookConfig.fileSystemAccess
    });
    
    // Log execution start
    await this.auditLogger.logHookExecution({
      hookName: hookConfig.name,
      user: context.user,
      permissions: permissions.granted,
      timestamp: new Date().toISOString(),
      contextHash: this.dataProtector.hashContext(sanitizedContext)
    });
    
    try {
      // Execute hook in secure environment
      const result = await executionEnv.execute(
        hookConfig.agent,
        sanitizedContext
      );
      
      // Audit successful execution
      await this.auditLogger.logHookSuccess({
        hookName: hookConfig.name,
        duration: Date.now() - startTime,
        resourceUsage: executionEnv.getResourceUsage()
      });
      
      return result;
      
    } catch (error) {
      // Audit execution failure
      await this.auditLogger.logHookFailure({
        hookName: hookConfig.name,
        error: error.message,
        stackTrace: this.sanitizeStackTrace(error.stack)
      });
      
      throw error;
      
    } finally {
      // Clean up secure environment
      await executionEnv.cleanup();
    }
  }
  
  async createSecureEnvironment(config) {
    return {
      async execute(agent, context) {
        // Implement sandboxed execution
        return await this.executeInSandbox(agent, context, config);
      },
      
      getResourceUsage() {
        return this.resourceMonitor.getUsage();
      },
      
      async cleanup() {
        await this.cleanupResources();
      }
    };
  }
}

// .kiro/hooks/monitoring/observability.js
class HookObservability {
  constructor(config) {
    this.metricsCollector = new MetricsCollector();
    this.traceCollector = new TraceCollector();
    this.alertManager = new AlertManager();
  }
  
  async instrumentHook(hookConfig) {
    const hookName = hookConfig.name;
    
    return {
      async execute(context) {
        const traceId = generateTraceId();
        const span = this.traceCollector.startSpan(hookName, traceId);
        
        try {
          // Record execution metrics
          this.metricsCollector.increment(`hooks.${hookName}.executions`);
          this.metricsCollector.gauge(`hooks.${hookName}.active`, 1);
          
          const startTime = Date.now();
          const result = await hookConfig.agent(context);
          const duration = Date.now() - startTime;
          
          // Record success metrics
          this.metricsCollector.histogram(`hooks.${hookName}.duration`, duration);
          this.metricsCollector.increment(`hooks.${hookName}.success`);
          
          // Check for performance anomalies
          await this.checkPerformanceAnomaly(hookName, duration);
          
          span.setStatus({ code: 'OK' });
          span.end();
          
          return result;
          
        } catch (error) {
          // Record error metrics
          this.metricsCollector.increment(`hooks.${hookName}.errors`);
          this.metricsCollector.increment(`hooks.${hookName}.errors.${error.code}`);
          
          // Alert on critical errors
          if (this.isCriticalError(error)) {
            await this.alertManager.sendAlert({
              level: 'critical',
              message: `Hook ${hookName} failed with critical error: ${error.message}`,
              hookName,
              traceId,
              context: this.sanitizeContext(context)
            });
          }
          
          span.recordException(error);
          span.setStatus({ code: 'ERROR', message: error.message });
          span.end();
          
          throw error;
          
        } finally {
          this.metricsCollector.gauge(`hooks.${hookName}.active`, -1);
        }
      }
    };
  }
  
  async checkPerformanceAnomaly(hookName, duration) {
    const baseline = await this.getPerformanceBaseline(hookName);
    
    if (duration > baseline.p95 * 2) {
      await this.alertManager.sendAlert({
        level: 'warning',
        message: `Hook ${hookName} execution took ${duration}ms (baseline P95: ${baseline.p95}ms)`,
        hookName,
        metrics: { duration, baseline }
      });
    }
  }
}

// .kiro/hooks/deployment/gradual-rollout.js
class GradualRollout {
  constructor(config) {
    this.config = config;
    this.featureFlags = new FeatureFlags();
    this.metricsCollector = new MetricsCollector();
  }
  
  async deployHook(hookConfig) {
    const rolloutPlan = {
      phases: [
        { name: 'canary', percentage: 5, duration: '24h' },
        { name: 'limited', percentage: 25, duration: '48h' },
        { name: 'majority', percentage: 75, duration: '72h' },
        { name: 'full', percentage: 100, duration: 'ongoing' }
      ]
    };
    
    for (const phase of rolloutPlan.phases) {
      console.log(`Starting rollout phase: ${phase.name} (${phase.percentage}%)`);
      
      // Configure feature flag
      await this.featureFlags.setPercentage(
        `hook.${hookConfig.name}`,
        phase.percentage
      );
      
      // Monitor phase performance
      const phaseResults = await this.monitorPhase(hookConfig, phase);
      
      // Check success criteria
      if (!this.evaluatePhaseSuccess(phaseResults)) {
        // Rollback on failure
        await this.rollback(hookConfig, phase);
        throw new RolloutFailureError(`Phase ${phase.name} failed criteria`);
      }
      
      // Wait for phase duration
      await this.waitForPhaseDuration(phase.duration);
    }
    
    console.log(`Hook ${hookConfig.name} successfully rolled out to 100%`);
  }
}