Ethers.js 中的事件处理程序

Question

我正在使用https://github.com/ethers-io/ethers.js/我有以下智能合约，

contract WhiteList {

   event logAddressChange(address indexed purchaser, uint256 value, uint256 amount);

   function changeContractAddress(address _purchaser, uint256 _whitelistCap)
        public
        returns (bool)
    {

        logAddressChange(_purchaser, _whitelistCap, _whitelistCap);
        return true;
    }

}

我正在尝试为 logAddressChange 事件开发节点 js 侦听器。 我只想听那个事件。

我的节点服务器js

app.listen(port, function() {
    homeController.check_health();
});

我的节点js控制器

var config = require('config');
var ethers = require('ethers');
var providers = require('ethers').providers;
var network = providers.networks.rinkeby;
var infuraProvider = new providers.InfuraProvider(network);
var etherscanProvider = new providers.EtherscanProvider(network);
var fallbackProvider = new providers.FallbackProvider([
    infuraProvider,
    etherscanProvider
]);
var provider = providers.getDefaultProvider(network)
var contract_provider = config.get('contract_provider');
var contract_address = config.get('contract_address');
var contract_abi = config.get('contract_abi');
var account_private_key = config.get('account_private_key');
var account_address = config.get('account_address');
var crm_url = config.get('crm_url');
var wallet = new ethers.Wallet(account_private_key, provider);
var contract = new ethers.Contract(contract_address, contract_abi, wallet);
var provider_contract = new ethers.Contract(contract_address, contract_abi, provider);
var overrideOptions = {
    gasLimit: 250000,
    nonce: 0,
    value: ethers.utils.parseEther('1.0')
};
exports.check_health = function(req, res) {
  console.log('started event');
  contract.events.onlogAddressChange = function(purchaser, value, amount) {
    console.log('started event1');
      console.log("purchaser:" + purchaser);
      console.log("value:" + value);
      console.log("amount:" + amount);
  };
}; 

触发事件后我已经等了一个多小时，但仍然没有。

我不知道我做错了什么。

你能帮忙吗？

Answer 1

所以结果我在文档中遗漏了一些东西。

即使函数是 CamelCase，事件观察器也必须全部小写：

只需要更改而不是 onlogAddressChange 我应该有 onlogaddresschange

exports.check_health = function(req, res) {
  console.log('started event');
  contract.events.onlogaddresschange = function(purchaser, value, amount) {
    console.log('started event1');
      console.log("purchaser:" + purchaser);
      console.log("value:" + value);
      console.log("amount:" + amount);
  };
};

谢谢