6.3.3 Chain33接入说明

  1. 使用chain33 client与节点进行交互

• 示例：

     ./chain33-cli --rpc_laddr 
     "https://4PRFS2zJmhYYqzKllW:cVlWcaXx8K77OCTSXI@bsng153JTlU.bsngate.com:19602/node1"  block last_header
     {
         "version": 0,
         "parentHash": 
    "0x0000000000000000000000000000000000000000000000000000000000000000",
  
         "txHash": "0x22db70a26130f2fe4758fd65bf016949c1c46f5642b4a556f8a0ff7a41350898",
  
         "stateHash": 
    "0xc34a7713273f1ac2256355c754b6c8ed9b9c726b84d16866ccaa4b7df29d7cc8",
  
         "height": 0,
  
         "blockTime": 1620443036658,
  
         "txCount": 1,
  
         "hash": "0xa17a19fc1b525b783130fe4ce797feb815039e5fb96e06ea4e6a600ee0970170",
  
         "difficulty": 520159231
    }
  

  2. 使用JSON-RPC API与节点进行交互

• Json-RPC接口地址：https://chain.33.cn/document/95

  可以使用curl和Postman进行调用。

• 示例：

     curl -H "Content-Type: application/json"   -d 
     '{"jsonrpc":"2.0","method":"Chain33.GetLastHeader","params":[],"id":2}'   
     https://4PRFS2zJmhYYqzKllW:cVlWcaXx8K77OCTSXI@bsng153JTlU.bsngate.com:19602/node1
  
     {"id":2,"result":{"version":0,"parentHash":"0x0000000000000000000000000000000000000000000000000000000000000000","txHash":"0x22db70a26130f2fe4758fd65bf016949c1c46f5642b4a556f8a0ff7a41350898","stateHash":"0xc34a7713273f1ac2256355c754b6c8ed9b9c726b84d16866ccaa4b7df29d7cc8","height":0,"blockTime":1620443036658,"txCount":1,"hash":"0xa17a19fc1b525b783130fe4ce797feb815039e5fb96e06ea4e6a600ee0970170","difficulty":520159231},"error":null}
  

  3. 使用JAVA SDK与节点进行交互

• 接口文档：

  https://github.com/33cn/chain33-sdk-java/blob/master/联盟链接口说明.md

• 示例：

     package com.hll.bty;
  
     import cn.chain33.javasdk.client.RpcClient;
     import cn.chain33.javasdk.utils.EvmUtil;
     import cn.chain33.javasdk.utils.HexUtil;
     import org.junit.Test;
  
     import com.alibaba.fastjson.JSONArray;
  
     public class EvmTest {
  
        //格式为https://授权用户名:授权密码@peer节点RPC端点
  
         RpcClient client = new 
            RpcClient("https://4PRFS2zJmhYYqzKllW:cVlWcaXx8K77OCTSXI@bsng153JTlU.bsngate.com:19602/node1");
  
         @Test
  
         public void testEvmContract() throws InterruptedException {
  
            String privateKey = 
            "73363A3A483A0916835EB8B803D23EBE27631BE96E9FCA0CBBFB702EABC21BAC";
  
            String code = "0x608060405234801561001057600080fd5b5060c78061001f6000396000f3fe6080604052348015600f57600080fd5b506004361060325760003560e01c806360fe47b11460375780636d4ce63c146062575b600080fd5b606060048036036020811015604b57600080fd5b8101908080359060200190929190505050607e565b005b60686088565b6040518082815260200191505060405180910390f35b8060008190555050565b6000805490509056fea2646970667358221220ed06cf1aefb69c19593b31e7039b83768108c2943ca726b68b351622b14a292f64736f6c63430007040033";
  
            String abi = "[\n" +
                "\t{\n" +
                "\t\t\"inputs\": [],\n" +
                "\t\t\"name\": \"get\",\n" +
                "\t\t\"outputs\": [\n" +
                "\t\t\t{\n" +
                "\t\t\t\t\"internalType\": \"uint256\",\n" +
                "\t\t\t\t\"name\": \"\",\n" +
                "\t\t\t\t\"type\": \"uint256\"\n" +
                "\t\t\t}\n" +
                "\t\t],\n" +
                "\t\t\"stateMutability\": \"view\",\n" +
                "\t\t\"type\": \"function\"\n" +
                "\t},\n" +
                "\t{\n" +
                "\t\t\"inputs\": [\n" +
                "\t\t\t{\n" +
                "\t\t\t\t\"internalType\": \"uint256\",\n" +
                "\t\t\t\t\"name\": \"_x\",\n" +
                "\t\t\t\t\"type\": \"uint256\"\n" +
                "\t\t\t}\n" +
                "\t\t],\n" +
                "\t\t\"name\": \"set\",\n" +
                "\t\t\"outputs\": [],\n" +
                "\t\t\"stateMutability\": \"nonpayable\",\n" +
                "\t\t\"type\": \"function\"\n" +
                "\t}\n" +
                "]";
  
        // 部署合约      
         String txEncode = EvmUtil.createEvmContract(HexUtil.fromHexString(code), "", "evm-sdk-test-para0", abi, privateKey);
         String submitTransaction = client.submitTransaction(txEncode);
         String contractName = submitTransaction;
         System.out.println(submitTransaction);
         Thread.sleep(1000);
  
        // 调用合约
         txEncode = EvmUtil.callEvmContract("".getBytes(),"", 0, "set(15)", contractName, privateKey);
         submitTransaction = client.submitTransaction(txEncode);
         System.out.println(submitTransaction);    
         Thread.sleep(1000);
  
        // 计算合约地址
         String contractAddress = client.convertExectoAddr("user.evm." + contractName);
         System.out.println(contractAddress);
  
        // 查询
         JSONArray result = client.queryEVMABIResult(contractAddress, "user.evm." + contractName, "get()");
         System.out.println("查询结果：　" + result.toJSONString());
  
        // 再次调用合约
         txEncode = EvmUtil.callEvmContract("".getBytes(),"", 0, "get()", contractName, privateKey);
         submitTransaction = client.submitTransaction(txEncode);
         System.out.println(submitTransaction);
  
        }   
  
    }