3-3. Blockchain Loader Structure

Overview

The Blockchain Loader serves as the bridge between the Mei system and underlying blockchain networks, responsible for handling all on-chain data retrieval, parsing, and synchronization. Currently focused on deep integration with the Solana ecosystem while reserving expansion interfaces for EVM-compatible chains. Think of it as an intelligent data translator that converts complex on-chain information into formats that Mei can understand and process.

Core Architecture Design

Layered Loader Architecture

Application Interface Layer
    ↓
Data Abstraction Layer
    ↓
Protocol Adapter Layer
    ↓
Network Connection Layer
    ↓
Solana Network (Current) | EVM Networks (In Development)

Modular Component System

Each component focuses on specific functional areas, ensuring system maintainability and scalability.

Core Components

• Connection Manager: Network connection management

• Data Parser: On-chain data parsing

• Cache Controller: Cache management

• Event Listener: Event monitoring

• State Synchronizer: State synchronization

Solana Loader Implementation

Connection Management System

The Solana loader employs intelligent connection management to ensure optimal network performance.

RPC Node Optimization

interface SolanaConnectionManager {
  endpoints: RPCEndpoint[];
  
  async selectOptimalEndpoint(): Promise<Connection> {
    const healthChecks = await Promise.all(
      this.endpoints.map(endpoint => this.checkEndpointHealth(endpoint))
    );
    
    return this.createConnection(this.getBestEndpoint(healthChecks));
  }
  
  async checkEndpointHealth(endpoint: RPCEndpoint): Promise<HealthStatus> {
    return {
      latency: await this.measureLatency(endpoint),
      availability: await this.checkAvailability(endpoint),
      blockHeight: await this.getCurrentBlockHeight(endpoint),
      load: await this.getServerLoad(endpoint)
    };
  }
}

Connection Pool Management

To improve performance and resource utilization, implement intelligent connection pool management:

class ConnectionPool {
  private pool: Map<string, Connection[]> = new Map();
  private maxConnections = 10;
  
  async getConnection(priority: 'high' | 'medium' | 'low'): Promise<Connection> {
    // Allocate connection based on priority
    const availableConnection = this.findAvailableConnection(priority);
    
    if (availableConnection) {
      return availableConnection;
    }
    
    // Create new connection or wait for existing connection release
    return await this.createOrWaitForConnection(priority);
  }
}

Data Parsing Engine

Processes various Solana on-chain data structures, converting them to unified internal formats.

Account Data Parsing

interface AccountDataParser {
  // SPL Token parsing
  parseSPLToken(accountInfo: AccountInfo<Buffer>): SPLTokenData;
  
  // NFT metadata parsing
  parseNFTMetadata(metaplexData: Buffer): NFTMetadata;
  
  // DeFi position parsing
  parseDeFiPosition(programData: Buffer): DeFiPosition;
  
  // Custom program data parsing
  parseCustomProgram(programId: string, data: Buffer): CustomProgramData;
}

Transaction Data Parsing

interface TransactionParser {
  parseTransaction(txSignature: string): Promise<ParsedTransaction> {
    const transaction = await this.connection.getTransaction(txSignature);
    
    return {
      signature: txSignature,
      timestamp: transaction.blockTime,
      instructions: this.parseInstructions(transaction.transaction.message),
      balanceChanges: this.calculateBalanceChanges(transaction),
      fees: transaction.meta.fee,
      status: transaction.meta.err ? 'failed' : 'success'
    };
  }
}

Real-Time Event Monitoring

Monitors real-time events on the Solana network, providing instant updates for users.

WebSocket Connection Management

class SolanaEventListener {
  private wsConnections: Map<string, WebSocket> = new Map();
  
  async subscribeToAccount(accountPubkey: string, callback: Function) {
    const ws = new WebSocket(this.getWebSocketEndpoint());
    
    ws.onopen = () => {
      ws.send(JSON.stringify({
        jsonrpc: "2.0",
        id: 1,
        method: "accountSubscribe",
        params: [
          accountPubkey,
          { encoding: "jsonParsed", commitment: "finalized" }
        ]
      }));
    };
    
    ws.onmessage = (event) => {
      const data = JSON.parse(event.data);
      if (data.method === "accountNotification") {
        callback(this.parseAccountUpdate(data.params));
      }
    };
  }
}

Data Caching Strategy

Multi-Layer Cache Architecture

To optimize performance, implement a multi-layer caching system:

interface CacheLayer {
  // L1: Memory cache (millisecond-level access)
  memoryCache: Map<string, CacheEntry>;
  
  // L2: Local storage (100ms-level access)
  localStorage: IndexedDB;
  
  // L3: Distributed cache (second-level access)
  distributedCache: Redis;
}

Intelligent Caching Strategy

Adopt different caching strategies based on data types and access patterns:

Cache Strategy Configuration

const cacheStrategies = {
  // Price data: Short-term cache, high-frequency updates
  priceData: {
    ttl: 30, // 30 seconds
    updateFrequency: 'high',
    invalidationTrigger: 'time'
  },
  
  // Account balance: Medium-term cache, event-driven updates
  accountBalance: {
    ttl: 300, // 5 minutes
    updateFrequency: 'medium', 
    invalidationTrigger: 'event'
  },
  
  // NFT metadata: Long-term cache, rarely changes
  nftMetadata: {
    ttl: 86400, // 24 hours
    updateFrequency: 'low',
    invalidationTrigger: 'manual'
  }
};

Data Synchronization Mechanisms

Incremental Sync Strategy

Only synchronize changed data, significantly reducing network load:

class IncrementalSyncManager {
  private lastSyncBlockHeight: number = 0;
  
  async performIncrementalSync(): Promise<SyncResult> {
    const currentBlock = await this.getCurrentBlockHeight();
    const changedAccounts = await this.getChangedAccountsSince(this.lastSyncBlockHeight);
    
    const syncTasks = changedAccounts.map(account => 
      this.syncAccountData(account)
    );
    
    const results = await Promise.allSettled(syncTasks);
    this.lastSyncBlockHeight = currentBlock;
    
    return this.processSyncResults(results);
  }
}

Conflict Resolution Mechanism

Handle conflicts that may arise from concurrent data updates:

interface ConflictResolution {
  strategy: 'last_write_wins' | 'version_vector' | 'custom';
  
  resolveConflict(localData: any, remoteData: any): Promise<any> {
    switch (this.strategy) {
      case 'last_write_wins':
        return this.compareTimestamps(localData, remoteData);
      case 'version_vector':
        return this.mergeWithVersionVector(localData, remoteData);
      case 'custom':
        return this.customMergeLogic(localData, remoteData);
    }
  }
}

EVM-Compatible Chain Extension Preparation

Abstract Interface Design

Prepared for future EVM chain support with universal blockchain interfaces:

interface BlockchainAdapter {
  networkType: 'solana' | 'evm';
  networkId: string;
  
  // Universal interfaces
  connect(): Promise<Connection>;
  getBalance(address: string): Promise<Balance>;
  getTransaction(txHash: string): Promise<Transaction>;
  sendTransaction(tx: Transaction): Promise<TransactionResult>;
  
  // Network-specific interfaces
  getNetworkSpecificData(params: any): Promise<any>;
}

EVM Adapter Preview

class EVMAdapter implements BlockchainAdapter {
  networkType = 'evm' as const;
  
  constructor(
    public networkId: string,
    private web3Provider: Web3Provider
  ) {}
  
  async getBalance(address: string): Promise<Balance> {
    const ethBalance = await this.web3Provider.getBalance(address);
    const tokenBalances = await this.getERC20Balances(address);
    
    return {
      native: ethBalance,
      tokens: tokenBalances
    };
  }
  
  async parseERC20Transaction(txHash: string): Promise<ERC20Transfer> {
    // EVM transaction parsing logic
    const receipt = await this.web3Provider.getTransactionReceipt(txHash);
    return this.extractERC20Transfers(receipt);
  }
}

Performance Monitoring and Optimization

Performance Metrics Monitoring

Real-time monitoring of loader performance to ensure optimal user experience:

interface PerformanceMetrics {
  connectionLatency: number;      // Connection latency
  dataLoadTime: number;          // Data loading time
  cacheHitRate: number;          // Cache hit rate
  errorRate: number;             // Error rate
  throughput: number;            // Throughput
}

class PerformanceMonitor {
  async collectMetrics(): Promise<PerformanceMetrics> {
    return {
      connectionLatency: await this.measureConnectionLatency(),
      dataLoadTime: await this.measureDataLoadTime(),
      cacheHitRate: this.calculateCacheHitRate(),
      errorRate: this.calculateErrorRate(),
      throughput: this.calculateThroughput()
    };
  }
}

Automatic Optimization Mechanism

Automatically adjust loader behavior based on performance metrics:

class AutoOptimizer {
  async optimizeBasedOnMetrics(metrics: PerformanceMetrics) {
    if (metrics.connectionLatency > 1000) {
      await this.switchToFasterEndpoint();
    }
    
    if (metrics.cacheHitRate < 0.8) {
      this.adjustCacheStrategy();
    }
    
    if (metrics.errorRate > 0.05) {
      this.enableRetryMechanism();
    }
  }
}

Error Handling and Recovery

Fault Tolerance Mechanism

class FaultTolerance {
  async executeWithRetry<T>(
    operation: () => Promise<T>,
    maxRetries: number = 3
  ): Promise<T> {
    for (let attempt = 1; attempt <= maxRetries; attempt++) {
      try {
        return await operation();
      } catch (error) {
        if (attempt === maxRetries) {
          throw error;
        }
        
        await this.waitBeforeRetry(attempt);
      }
    }
  }
  
  private async waitBeforeRetry(attempt: number): Promise<void> {
    // Exponential backoff strategy
    const delay = Math.min(1000 * Math.pow(2, attempt - 1), 10000);
    await new Promise(resolve => setTimeout(resolve, delay));
  }
}

Advanced Features

Data Streaming

Real-time data streaming for live updates:

interface DataStreaming {
  // Stream account changes
  streamAccountUpdates(accounts: string[]): Observable<AccountUpdate>;
  
  // Stream transaction confirmations
  streamTransactions(signatures: string[]): Observable<TransactionUpdate>;
  
  // Stream market data
  streamMarketData(tokens: string[]): Observable<MarketUpdate>;
  
  // Batch streaming for efficiency
  createBatchStream(subscriptions: StreamSubscription[]): Observable<BatchUpdate>;
}

Smart Data Prefetching

Predictive data loading based on user behavior:

class SmartPrefetcher {
  async prefetchUserData(userId: string, context: UserContext): Promise<void> {
    // Analyze user patterns
    const patterns = await this.analyzeUserPatterns(userId);
    
    // Predict likely next actions
    const predictions = this.predictNextActions(patterns, context);
    
    // Prefetch relevant data
    await Promise.all(
      predictions.map(prediction => this.prefetchData(prediction))
    );
  }
}

Network Health Monitoring

Comprehensive network health tracking:

interface NetworkHealthMonitor {
  healthMetrics: {
    nodeLatency: Map<string, number>;
    nodeAvailability: Map<string, boolean>;
    networkCongestion: number;
    blockTime: number;
  };
  
  monitorNetworkHealth(): Observable<NetworkHealth>;
  selectOptimalNodes(): Promise<string[]>;
  handleNodeFailure(nodeId: string): Promise<void>;
}

The Blockchain Loader's design philosophy is "stability first, performance second." On the foundation of ensuring data accuracy and system stability, various optimization strategies are employed to enhance user experience. The current deep Solana integration provides users with optimal Web3 experience, while reserved EVM expansion interfaces ensure future scalability.