DartChain SDK: Advanced Features

The DartChain SDK provides powerful tools for developers who need custom functionality beyond our visual workflow builder. Whether you're building custom components, integrating with proprietary systems, or creating entirely new workflow types, the SDK gives you the flexibility and power you need.

Why Use the SDK?

While DartChain's visual interface handles most automation needs, the SDK unlocks advanced capabilities:

Custom Components: Build reusable workflow components for your team
System Integrations: Connect to proprietary or legacy systems
Advanced Logic: Implement complex business rules and algorithms
Performance Optimization: Fine-tune critical workflows for maximum efficiency
Enterprise Features: Add custom security, compliance, and governance layers

SDK Architecture Overview

The DartChain SDK is built on a plugin architecture that integrates seamlessly with our visual platform:

import { DartChainSDK, Component, Trigger, Action } from '@dartchain/sdk'

const sdk = new DartChainSDK({
  apiKey: process.env.DARTCHAIN_API_KEY,
  environment: 'production'
})

Core Concepts

Components

Reusable building blocks that encapsulate functionality:

@Component({
  name: 'custom-data-processor',
  version: '1.0.0',
  description: 'Processes customer data with advanced analytics'
})
export class CustomDataProcessor {
  @Input() customerData: CustomerData
  @Output() processedData: ProcessedCustomerData
  
  async execute() {
    // Your custom logic here
    return this.processData(this.customerData)
  }
}

Triggers

Event sources that start workflows:

@Trigger({
  name: 'webhook-trigger',
  description: 'Responds to incoming webhook calls'
})
export class WebhookTrigger {
  @Config() endpoint: string
  @Config() authentication: AuthConfig
  
  async setup() {
    // Register webhook endpoint
    return this.registerWebhook()
  }
}

Actions

Operations that perform work within workflows:

@Action({
  name: 'send-slack-message',
  description: 'Sends formatted messages to Slack'
})
export class SlackAction {
  @Input() message: string
  @Input() channel: string
  @Config() botToken: string
  
  async execute() {
    return this.slackClient.send(this.message, this.channel)
  }
}

Advanced SDK Features

1. Custom Data Types

Define domain-specific data structures:

@DataType('CustomerProfile')
export interface CustomerProfile {
  id: string
  personalInfo: PersonalInfo
  preferences: UserPreferences
  analytics: AnalyticsData
}

@DataType('ProcessingResult')
export interface ProcessingResult {
  score: number
  recommendations: Recommendation[]
  flags: SecurityFlag[]
}

2. State Management

Handle complex stateful operations:

@Component()
export class StatefulProcessor {
  @State() private processingState: ProcessingState
  
  async processChunk(data: DataChunk) {
    this.processingState.update({
      totalProcessed: this.processingState.totalProcessed + data.length,
      lastProcessedAt: new Date()
    })
    
    return this.processData(data)
  }
}

3. Error Handling and Retries

Implement sophisticated error handling:

@Component({
  retryPolicy: {
    maxAttempts: 3,
    backoffStrategy: 'exponential',
    retryableErrors: ['NETWORK_ERROR', 'RATE_LIMIT']
  }
})
export class ResilientProcessor {
  @ErrorHandler('NETWORK_ERROR')
  async handleNetworkError(error: NetworkError) {
    // Custom network error handling
    await this.switchToBackupEndpoint()
    return 'RETRY'
  }
  
  @ErrorHandler('RATE_LIMIT')
  async handleRateLimit(error: RateLimitError) {
    // Wait for rate limit reset
    await this.delay(error.resetTime)
    return 'RETRY'
  }
}

4. Performance Optimization

Optimize critical workflows:

@Component({
  caching: {
    enabled: true,
    ttl: 3600, // 1 hour
    strategy: 'LRU'
  },
  parallelization: {
    maxConcurrency: 10,
    batchSize: 100
  }
})
export class OptimizedProcessor {
  @Cached()
  async expensiveOperation(input: ComplexInput) {
    // This result will be cached
    return this.performComplexCalculation(input)
  }
  
  @Parallel()
  async processBatch(items: Item[]) {
    // Automatically parallelized
    return items.map(item => this.processItem(item))
  }
}

Real-World Use Cases

Custom CRM Integration

@Component('salesforce-sync')
export class SalesforceSync {
  @Config() salesforceConfig: SalesforceConfig
  @Input() customerUpdates: CustomerUpdate[]
  
  async execute() {
    const sfClient = new SalesforceClient(this.salesforceConfig)
    
    const results = await Promise.allSettled(
      this.customerUpdates.map(update => 
        sfClient.updateContact(update.id, update.changes)
      )
    )
    
    return this.aggregateResults(results)
  }
}

Advanced Analytics Pipeline

@Component('ml-prediction')
export class MLPredictionComponent {
  @Config() modelEndpoint: string
  @Input() features: FeatureVector
  @Output() prediction: PredictionResult
  
  async execute() {
    const prediction = await this.mlService.predict(
      this.features,
      { model: 'customer-churn-v2' }
    )
    
    return {
      score: prediction.score,
      confidence: prediction.confidence,
      factors: prediction.explanations
    }
  }
}

Custom Security Layer

@Component('security-scan')
export class SecurityScanComponent {
  @Config() scannerConfig: SecurityConfig
  @Input() payload: any
  @Output() scanResult: SecurityScanResult
  
  async execute() {
    const scanners = [
      new XSSScanner(),
      new SQLInjectionScanner(),
      new MalwareScanner()
    ]
    
    const results = await Promise.all(
      scanners.map(scanner => scanner.scan(this.payload))
    )
    
    return this.aggregateScanResults(results)
  }
}

Testing SDK Components

Unit Testing

import { TestHarness } from '@dartchain/sdk-testing'

describe('CustomDataProcessor', () => {
  let harness: TestHarness
  let processor: CustomDataProcessor
  
  beforeEach(() => {
    harness = new TestHarness()
    processor = harness.createComponent(CustomDataProcessor)
  })
  
  it('should process customer data correctly', async () => {
    const inputData = harness.mockCustomerData()
    const result = await processor.execute(inputData)
    
    expect(result.score).toBeGreaterThan(0)
    expect(result.recommendations).toHaveLength(3)
  })
})

Integration Testing

import { WorkflowTestRunner } from '@dartchain/sdk-testing'

describe('Customer Onboarding Workflow', () => {
  it('should complete full onboarding process', async () => {
    const runner = new WorkflowTestRunner()
    
    const result = await runner
      .loadWorkflow('customer-onboarding')
      .withInput('newCustomer', mockCustomerData)
      .withMockComponent('email-service', mockEmailService)
      .execute()
    
    expect(result.status).toBe('completed')
    expect(result.outputs.welcomeEmailSent).toBe(true)
  })
})

Deployment and Distribution

Component Registry

Publish your components to share with your team:

# Build your component
npm run build

# Publish to DartChain registry
dartchain publish --component custom-data-processor

# Install in other projects
dartchain install custom-data-processor@1.0.0

Version Management

@Component({
  name: 'data-processor',
  version: '2.0.0',
  compatibility: {
    minSdkVersion: '1.5.0',
    deprecatedIn: '3.0.0'
  }
})
export class DataProcessorV2 {
  // Implementation
}

Best Practices

1. Design for Reusability

Keep components focused on single responsibilities
Use configuration for flexibility
Provide clear documentation and examples

2. Handle Errors Gracefully

Use typed error classes
Provide meaningful error messages
Implement proper retry logic

3. Optimize Performance

Use caching for expensive operations
Implement proper batching
Monitor resource usage

4. Security Considerations

Validate all inputs
Use secure credential management
Implement proper access controls

Getting Started

Ready to build with the SDK? Here's what you need:

Get SDK Access: Request access through your DartChain dashboard
Review Documentation: Comprehensive guides at docs.dartchain.io/sdk
Join Developer Community: Connect with other SDK developers
Start Building: Use our starter templates to get up and running quickly

The DartChain SDK opens up limitless possibilities for customization and integration. Whether you're building simple utilities or complex enterprise integrations, the SDK provides the foundation you need to succeed.

Ready to get started? Request SDK access and begin building today!