我该如何从流量区块链上的智能合约中听取活动？

发布于 2025-02-11 17:57:03 字数 65 浏览 0 评论 0 原文

我使用了一些服务来聆听我在以太坊上的智能合约中的活动。但是我找不到与流量区块链一起工作时的任何文档。我该怎么做？

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极度宠爱 2025-02-18 17:57:03

对于一项共同任务来说，这是一个非常好的问题！
@onflow/fllfly/fcl 软件包为您提供有用的方法events ，可用于“订阅”特定事件。您可以在Flow Docs网站上查看事件描述。或者，您可以复制/粘贴代码bellow并随身携带：

import * as fcl from "@onflow/fcl";

// We need to point FCL to some access node.
// We will use Mainnet REST endpoint for this, as the contract
// we want to listen to is deployed there

fcl.config({
  "accessNode.api": "https://rest-mainnet.onflow.org",
  // we will set the poll rate for events to 3 seconds
  "fcl.eventPollRate": 3000
});

// FlowFees is the most active contract, since every transaction will
// trigger "FeesDeducted" event, so it will be easier to see that our code
// is working correctly
const contractAddress = "f919ee77447b7497";
const contractName = "FlowFees";
const eventName = "FeesDeducted";

// Event name consist of 2 or 4 parts
// 2 part event name have only system events
// For deployed contract, event should be constructed from 4 parts
// - "A" prefix, stands for "account"
// - address where contract, holding definition of event is deployed
// - contract name
// - event name
const event = `A.${contractAddress}.${contractName}.${eventName}`;

console.log(
  `Listening for event "${eventName}" from "${contractName}" deployed on account 0x${contractAddress}`
);
fcl.events(event).subscribe((eventData) => {
  console.log(eventData);
});

您也可以尝试使用工作 codesandbox示例

This is a really nice question for a common task!
@onflow/fcl package provides you with a helpful method events, which can be used to "subscribe" to a specific event.
You can check events description on Flow Docs Site. Or you can copy/paste code bellow and play around with it:

import * as fcl from "@onflow/fcl";

// We need to point FCL to some access node.
// We will use Mainnet REST endpoint for this, as the contract
// we want to listen to is deployed there

fcl.config({
  "accessNode.api": "https://rest-mainnet.onflow.org",
  // we will set the poll rate for events to 3 seconds
  "fcl.eventPollRate": 3000
});

// FlowFees is the most active contract, since every transaction will
// trigger "FeesDeducted" event, so it will be easier to see that our code
// is working correctly
const contractAddress = "f919ee77447b7497";
const contractName = "FlowFees";
const eventName = "FeesDeducted";

// Event name consist of 2 or 4 parts
// 2 part event name have only system events
// For deployed contract, event should be constructed from 4 parts
// - "A" prefix, stands for "account"
// - address where contract, holding definition of event is deployed
// - contract name
// - event name
const event = `A.${contractAddress}.${contractName}.${eventName}`;

console.log(
  `Listening for event "${eventName}" from "${contractName}" deployed on account 0x${contractAddress}`
);
fcl.events(event).subscribe((eventData) => {
  console.log(eventData);
});

You can also try and play around with working Codesandbox Example

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