Documentation Index

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getRecentBlockhash

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参数

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响应

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迁移指南

1. 替换方法调用：

- const { blockhash, feeCalculator } = await connection.getRecentBlockhash();
+ const { blockhash, lastValidBlockHeight } = await connection.getLatestBlockhash();

2. 更新费用计算：

// Old way
const fee = feeCalculator.lamportsPerSignature * numSignatures;

// New way
const fee = await connection.getFeeForMessage(message);

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代码示例

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基本请求（旧版）

curl https://fra.rpc.orbitflare.com?api_key=YOUR-API-KEY -X POST -H "Content-Type: application/json" -d '{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getRecentBlockhash",
  "params": []
}'

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带 Commitment 的请求（旧版）

curl https://fra.rpc.orbitflare.com?api_key=YOUR-API-KEY -X POST -H "Content-Type: application/json" -d '{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getRecentBlockhash",
  "params": [
    {
      "commitment": "confirmed"
    }
  ]
}'

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使用 web3.js（旧版）

import { Connection } from '@solana/web3.js';

const connection = new Connection('https://fra.rpc.orbitflare.com?api_key=YOUR-API-KEY');

// Get recent blockhash (deprecated)
const { value: { blockhash, feeCalculator } } = await connection.getRecentBlockhash();
console.log('Blockhash:', blockhash);
console.log('Fee per signature:', feeCalculator.lamportsPerSignature);

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注意事项

1. 此方法已弃用，将在未来版本中移除
2. 新开发请使用 getLatestBlockhash
3. blockhash 有效期有限（通常为 150 个 slot）
4. 可以指定不同的 commitment 级别
5. 考虑更新现有代码以使用新方法

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最佳实践

1. 新开发迁移到 getLatestBlockhash
2. 使用 getFeeForMessage 进行费用计算
3. 使用 lastValidBlockHeight 监控 blockhash 过期
4. 适当处理网络错误并重试
5. 根据需求使用适当的 commitment 级别

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常见错误

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用例

1. 交易费用计算
   interface TransactionFee {
     blockhash: string;
     feePerSignature: number;
     totalFee: number;
     metadata: { timestamp: number; slot: number; };
   }
   
   async function calculateTransactionFees(numSignatures: number): Promise<TransactionFee> {
     const { context, value } = await connection.getRecentBlockhash();
     return {
       blockhash: value.blockhash,
       feePerSignature: value.feeCalculator.lamportsPerSignature,
       totalFee: numSignatures * value.feeCalculator.lamportsPerSignature,
       metadata: { timestamp: Date.now(), slot: context.slot }
     };
   }
   
2. Blockhash 监控
   interface BlockhashInfo {
     blockhash: string;
     slot: number;
     feePerSignature: number;
     metadata: { timestamp: number; age: number; };
   }
   
   class BlockhashMonitor {
     private currentBlockhash: string | null = null;
     private currentSlot: number | null = null;
     
     async monitorBlockhash(interval: number = 5000): Promise<BlockhashInfo | null> {
       const { context, value } = await connection.getRecentBlockhash();
       if (this.currentBlockhash === value.blockhash) { return null; }
       this.currentBlockhash = value.blockhash;
       this.currentSlot = context.slot;
       return {
         blockhash: value.blockhash,
         slot: context.slot,
         feePerSignature: value.feeCalculator.lamportsPerSignature,
         metadata: { timestamp: Date.now(), age: 0 }
       };
     }
   }
   
3. 交易规划
   interface TransactionPlan {
     blockhash: string;
     feePerSignature: number;
     estimatedFees: { single: number; batch: number; };
     metadata: { timestamp: number; slot: number; };
   }
   
   async function planTransactions(
     numTransactions: number,
     signaturesPerTransaction: number
   ): Promise<TransactionPlan> {
     const { context, value } = await connection.getRecentBlockhash();
     const feePerSignature = value.feeCalculator.lamportsPerSignature;
     return {
       blockhash: value.blockhash,
       feePerSignature,
       estimatedFees: {
         single: signaturesPerTransaction * feePerSignature,
         batch: numTransactions * signaturesPerTransaction * feePerSignature
       },
       metadata: { timestamp: Date.now(), slot: context.slot }
     };
   }