如何下载或访问(‘web3 3/lib/web3 3/event.js’)；

Question

以下测试脚本需要(‘web3/lib/web3/event.js’)；

const SolidityEvent = require('web3/lib/web3/event.js');

function decodeLogs (logs, contract, address) {
 return logs.map(log => {
const event = new SolidityEvent(null, contract.events[log.topics[0]],   address);
return event.decode(log);
});
}

module.exports = {
 decodeLogs,
};

有人知道我在哪里可以找到这个库吗?还是安装了web3下载的库？

提前谢谢!！

Answer 1

安装truffle并使用npm install web3命令安装web3。有关环境设置，请参阅这文章。

Answer 2

答:只需要web3

const SolidityEvent = require('web3');

 function decodeLogs (logs, contract, address) {
 return logs.map(log => {
 const event = new SolidityEvent(null, contract.events[log.topics[0]],      address);
 return event.decode(log);
 });
 }

 module.exports = {
 decodeLogs,
 };

Answer 3

对于那些无意中遇到这个问题的人来说，这适用于1.0.0的web3：

function decoder(logs, abi) {
  const topics = {};
  const args = abi.filter(x=>x.type === "event").forEach(e=>topics[e.signature]=e);
  
  let results = logs.filter(x=>x.topics.filter(t=>topics[t]).length > 0);
  return results.map(log=>{ return {args:web3.eth.abi.decodeLog(topics[log.topics[0]].inputs, log.data, log.topics), event:topics[log.topics[0]].name}});
}