Technical Service Documentation

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// Standard response format
interface APIResponse<T> {
  data: T
  success: boolean
  message?: string
  errors?: Array<{
    code: string
    message: string
    field?: string
  }>
  meta?: {
    pagination?: {
      page: number
      limit: number
      total: number
      hasNext: boolean
    }
    version: string
    timestamp: string
  }
}

// Error handling
interface APIError {
  code: string           // Machine-readable error code
  message: string        // Human-readable error message
  field?: string         // Field name for validation errors
  details?: any          // Additional error context
}

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// JWT token structure
interface JWTPayload {
  sub: string              // User ID
  iss: string              // Issuer (service)
  aud: string[]            // Audience (services)
  exp: number              // Expiration timestamp
  iat: number              // Issued at timestamp
  roles: string[]          // User roles
  permissions: string[]    // Specific permissions
  scopes: string[]         // OAuth scopes
}

// Authorization header format
// Authorization: Bearer <jwt_token>

// API key format (for service-to-service)
// X-API-Key: amx_<environment>_<random_string>

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# Rate limiting configuration
rate_limiting:
  default:
    requests_per_minute: 1000
    burst: 100
  authenticated:
    requests_per_minute: 5000
    burst: 500
  premium:
    requests_per_minute: 10000
    burst: 1000
  
  # Per-endpoint limits
  endpoints:
    "/api/v1/agents/*/execute":
      requests_per_minute: 100
      burst: 20
    "/api/v1/models/train":
      requests_per_minute: 10
      burst: 2

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// Service implementation example
@Service
@RestController
@RequestMapping("/api/v1/agents")
@Validated
class AgentService(
    private val agentRepository: AgentRepository,
    private val executionService: ExecutionService,
    private val metricsService: MetricsService
) {
    
    @PostMapping("/{agentId}/execute")
    @PreAuthorize("hasPermission(#agentId, 'agent', 'execute')")
    suspend fun executeAgent(
        @PathVariable agentId: String,
        @Valid @RequestBody request: ExecutionRequest,
        @AuthenticationPrincipal user: User
    ): ResponseEntity<ApiResponse<ExecutionResult>> {
        
        return try {
            // Validate agent exists and is active
            val agent = agentRepository.findById(agentId)
                ?: throw AgentNotFoundException(agentId)
            
            if (!agent.isActive) {
                throw AgentInactiveException(agentId)
            }
            
            // Execute agent with timeout and resource limits
            val result = executionService.execute(
                agent = agent,
                input = request.input,
                context = request.context,
                timeout = request.timeout ?: Duration.ofSeconds(30)
            )
            
            // Record metrics
            metricsService.recordExecution(
                agentId = agentId,
                userId = user.id,
                duration = result.duration,
                success = true
            )
            
            ResponseEntity.ok(
                ApiResponse.success(result)
            )
            
        } catch (e: AgentException) {
            metricsService.recordExecution(
                agentId = agentId,
                userId = user.id,
                duration = Duration.ZERO,
                success = false,
                error = e::class.simpleName
            )
            
            ResponseEntity.badRequest().body(
                ApiResponse.error<ExecutionResult>(
                    code = e.code,
                    message = e.message
                )
            )
        }
    }
}

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// Integration test example
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@Testcontainers
@ActiveProfiles("test")
class AgentServiceIntegrationTest {
    
    @Container
    val postgres = PostgreSQLContainer("postgres:13")
        .withDatabaseName("test_db")
        .withUsername("test_user")
        .withPassword("test_password")
    
    @Container
    val redis = GenericContainer("redis:6-alpine")
        .withExposedPorts(6379)
    
    @Autowired
    lateinit var testRestTemplate: TestRestTemplate
    
    @Test
    fun `should execute agent successfully`() = runTest {
        // Given
        val agent = createTestAgent()
        val request = ExecutionRequest(
            input = mapOf("message" to "Hello, world!"),
            context = mapOf("user_id" to "test_user")
        )
        
        // When
        val response = testRestTemplate.postForEntity(
            "/api/v1/agents/${agent.id}/execute",
            request,
            ApiResponse::class.java
        )
        
        // Then
        assertThat(response.statusCode).isEqualTo(HttpStatus.OK)
        assertThat(response.body?.success).isTrue()
        assertThat(response.body?.data).isNotNull()
    }
}

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# Service deployment template
apiVersion: apps/v1
kind: Deployment
metadata:
  name: agent-service
  namespace: aimatrix
spec:
  replicas: 3
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
  template:
    metadata:
      labels:
        app: agent-service
        version: v1.0.0
    spec:
      containers:
      - name: agent-service
        image: aimatrix/agent-service:1.0.0
        ports:
        - containerPort: 8080
          name: http
        - containerPort: 9090
          name: metrics
        env:
        - name: DATABASE_URL
          valueFrom:
            secretKeyRef:
              name: database-credentials
              key: url
        - name: REDIS_URL
          valueFrom:
            secretKeyRef:
              name: redis-credentials
              key: url
        resources:
          requests:
            memory: "512Mi"
            cpu: "250m"
          limits:
            memory: "1Gi"
            cpu: "500m"
        livenessProbe:
          httpGet:
            path: /health/live
            port: 8080
          initialDelaySeconds: 30
          periodSeconds: 30
        readinessProbe:
          httpGet:
            path: /health/ready
            port: 8080
          initialDelaySeconds: 15
          periodSeconds: 10

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# Istio service mesh configuration
apiVersion: security.istio.io/v1beta1
kind: PeerAuthentication
metadata:
  name: default
  namespace: aimatrix
spec:
  mtls:
    mode: STRICT

---
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: agent-service-policy
  namespace: aimatrix
spec:
  selector:
    matchLabels:
      app: agent-service
  rules:
  - from:
    - source:
        principals: ["cluster.local/ns/aimatrix/sa/api-gateway"]
  - to:
    - operation:
        methods: ["GET", "POST"]
        paths: ["/api/v1/agents/*"]

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// Data encryption at rest and in transit
@Configuration
class SecurityConfig {
    
    @Bean
    fun encryptionService(): EncryptionService {
        return AESEncryptionService(
            keyProvider = VaultKeyProvider(),
            algorithm = "AES/GCM/NoPadding"
        )
    }
    
    @Bean
    fun databaseEncryption(): DatabaseEncryption {
        return TransparentDataEncryption(
            encryptionService = encryptionService(),
            encryptedFields = setOf("personal_data", "sensitive_content")
        )
    }
}

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// Multi-level caching implementation
@Service
class CachingService {
    
    @Cacheable(
        value = ["agent-cache"],
        key = "#agentId",
        condition = "#result.cacheable"
    )
    suspend fun getAgent(agentId: String): Agent {
        return agentRepository.findById(agentId)
    }
    
    @CacheEvict(
        value = ["agent-cache"],
        key = "#agentId"
    )
    suspend fun invalidateAgent(agentId: String) {
        // Cache eviction handled by annotation
    }
}

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-- Performance optimization indexes
CREATE INDEX CONCURRENTLY idx_agents_active_created 
ON agents (active, created_at DESC) 
WHERE active = true;

CREATE INDEX CONCURRENTLY idx_executions_agent_timestamp 
ON agent_executions (agent_id, created_at DESC);

-- Partitioning for large tables
CREATE TABLE agent_executions_2024 PARTITION OF agent_executions
FOR VALUES FROM ('2024-01-01') TO ('2025-01-01');

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// Custom metrics implementation
@Component
class ServiceMetrics {
    
    private val executionTimer = Timer.builder("service.execution.duration")
        .description("Service execution time")
        .register(Metrics.globalRegistry)
    
    private val executionCounter = Counter.builder("service.execution.total")
        .description("Total service executions")
        .register(Metrics.globalRegistry)
    
    fun recordExecution(duration: Duration, success: Boolean) {
        executionTimer.record(duration)
        executionCounter.increment(
            Tags.of(
                "success", success.toString(),
                "service", "agent-service"
            )
        )
    }
}