A/B Testing Results API

The A/B Testing Results API is a crucial component of the Sophra System’s experimentation framework, providing robust endpoints for recording and retrieving metrics related to A/B tests. This API leverages Next.js 14’s route handlers and integrates seamlessly with Prisma ORM for efficient database operations. It plays a pivotal role in Sophra’s adaptive learning system by facilitating the collection and analysis of user interaction data across different test variants.

Architecturally, this component is designed as a microservice within Sophra’s larger ecosystem, emphasizing scalability and real-time processing capabilities. It utilizes a RESTful approach, offering POST and GET endpoints for submitting and retrieving test results respectively. The API’s integration with Prisma allows for type-safe database interactions, enhancing reliability and maintainability.

One of the key architectural decisions is the use of Node.js runtime for this API, enabling high-throughput processing of concurrent requests. This choice aligns with Sophra’s emphasis on performance and scalability, particularly important for handling potentially large volumes of A/B test data in real-time.

Performance optimization is a core focus of this component. It employs efficient data structures and database operations to minimize latency. The API includes built-in latency tracking, allowing for continuous monitoring and optimization of response times. Additionally, it leverages Prisma’s ability to perform bulk inserts, significantly reducing database write operations when recording multiple metrics simultaneously.

A unique feature of this API is its flexible metric recording system. It allows for the submission of arbitrary metrics as key-value pairs, providing extensibility to accommodate various types of A/B tests. The API also supports metadata attachment to metrics, enabling rich contextual information to be stored alongside quantitative data.

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Exported Components

const ResultsSchema = z.object({
  testId: z.string(),
  variantId: z.string(),
  metrics: z.record(z.number()),
  sessionId: z.string(),
  metadata: z.record(z.unknown()).optional(),
});

The ResultsSchema defines the structure for submitting A/B test results:

• testId: Unique identifier for the A/B test
• variantId: Identifier for the specific variant
• metrics: Key-value pairs of metric names and their numeric values
• sessionId: Unique identifier for the user session
• metadata: Optional additional contextual information

Both POST and GET functions return a NextResponse object, containing either the operation result or error information.

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Implementation Examples

const response = await fetch('/api/nous/ab-testing/results', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    testId: 'test-123',
    variantId: 'variant-A',
    metrics: { clickThroughRate: 0.15, conversionRate: 0.05 },
    sessionId: 'user-session-456',
    metadata: { userGroup: 'premium' }
  })
});

These examples demonstrate how to interact with the API endpoints from client-side JavaScript or other Sophra services.

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Sophra Integration Details

This API integrates closely with Sophra’s A/B testing framework and analytics engine. It interacts with the following components:

• Database Service: Utilizes Prisma client for database operations
• Logging Service: Employs the shared logger for error tracking and performance monitoring
• Analytics Engine: Provides data for real-time analysis and reporting

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Error Handling

The API implements comprehensive error handling:

All errors are logged using the shared logger service, enabling centralized monitoring and alerting.

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Data Flow

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Performance Considerations

• Bulk Inserts: Uses Prisma’s createMany for efficient batch inserts of metrics
• Indexing: Ensures proper database indexing on testId and variantId for fast queries
• Caching: Implements result caching for frequently accessed test data (not shown in current implementation)

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Security Implementation

• Input Validation: Utilizes Zod for strict request body validation
• Error Masking: Prevents leakage of sensitive information in error responses
• Rate Limiting: Implements rate limiting to prevent abuse (not shown in current implementation)

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Configuration

The API relies on the following environment variables:

POSTGRESQL_URL="postgresql://username:password@host:port/database"
LOG_LEVEL="info"

Runtime options:

• NODE_ENV: Determines the execution environment (development/production)
• PORT: Specifies the port on which the API server runs