浅谈佛萨奇2.0波场链/币安链/马蹄链智能合约系统开发技术详细及源码部署

// SPDX-License-Identifier: GPL-3.0

pragma solidity > 0.5.21;

//被调用者合约
contract Callee {
    function Adder(uint256 x, uint256 y) public returns(uint256) {
        return x + y;
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.5.21;

//被调用合约Callee的接口
abstract contract ICallee {
		//Callee.Adder的方法签名
    function Adder(uint256 x, uint256 y) public virtual returns(uint256);
}

//调用者合约
contract Caller {
    function crossCall(address addr, uint256 x, uint256 y) public returns(uint256) {
        ICallee callee = ICallee(addr); //将被调用合约的地址转化为ICalle接口
        return callee.Adder(x, y);      //根据接口和方法签名调用
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >= 0.8.0;

contract Caller {
    string[10] x;
    string[8] params;

    function cross_call(address callee, string calldata method, string calldata key, int256 value) public {
			//注意，method必须为方法签名格式,且方法签名的参数间不能有空格，例如"save(string,int256)"
	    callee.call((abi.encodeWithSignature(method, key, value));
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >= 0.8.0;

contract CrossCall {
    string[10] x;
    string[8] params;  //参数缓冲区

		//address类型的参数callee为被调用合约地址
    function cross_call(address callee, string calldata method, string calldata time, string calldata name, string calldata hash) public {
        
	//CrossVMCall is reserved key word
        params[0] = "CrossVMCall";//CrossVMCall为固定值，第一个参数必须是此值
        params[1] = method;       //方法名，例如"save"
        params[2] = "time";       //参数1的类型或key
        params[3] = time;         //参数1的value
        params[4] = "file_name";  //参数2的类型或key
        params[5] = name;         //参数2的value
        params[6] = "file_hash";  //参数3的类型或key
        params[7] = hash;         //参数2的value

	      callee.call("");//跨虚拟机调用callee合约，callee.call的参数为空，evm虚拟机会从参数缓冲区读取对应的参数
    }
}

/*
SPDX-License-Identifier: Apache-2.0
*/

package main

//export init_contract
func initContract() {}

//export upgrade
func upgrade() {}

//export crossCallEvmContract
func crossCallEvmContract() {
	ctx := NewSimContext()

	// 获取参数
	name, _ := ctx.ArgString("name")
	method, _ := ctx.ArgString("method")
	calldata, _ := ctx.Arg("calldata")
	params := make(map[string][]byte, 1)
	params["data"] = calldata

	//执行跨虚拟机低啊用
	if result, resultCode := ctx.CallContract(name, method, params); resultCode != SUCCESS {
		// 返回结果
		ctx.ErrorResult("failed to cross call evm contract: " + name)
	} else {
		// 返回结果
		ctx.SuccessResultByte(result)
		// 记录日志
		ctx.Log("cross call evm contract result:" + string(result))
	}
}

func main() {

}