Code snippet to check which Hive nodes are healthy

http://ifttt.com/images/no_image_card.png
Here is a Javascript script that allows you to verify which HIVE nodes are healthy. A modified version of this code can be added in a website to switch to a different node when the one in use stops being healthy. It can also be tested locally using NodeJs.

How to test this code snippet in a browser:

- Open your favorite browser (I strongly recommend using [Brave browser](https://brave.com/myc159) for its speed and security) - Navigate to https://cdn.jsdelivr.net/npm/steem/dist/steem.min.js (SteemJs) - On that page open the DevTools (`Ctrl + Shift + J` on Linux/Windows and `Cmd + Opt + J` on Mac) - Copy & paste (`Ctrl + A` and `Ctrl + C`) the steem.js code displayed on that page into the Browser Console and press enter. - Copy & paste my script below into the Console - Press enter.

Code snippet:

``` // To execute this script in NodeJs, simply add the next 2 lines: // const steem = require('steem'); // const fetch = require('node-fetch'); steem.config.set('address_prefix', 'STM'); steem.config.set('chain_id', '0000000000000000000000000000000000000000000000000000000000000000'); var nodes = [ 'https://api.hive.blog', // (hive) 'https://api.pharesim.me', 'https://steemd.minnowsupportproject.org', // (steem) 'https://api.steemit.com', // (steem) 'https://anyx.io', // (hive) 'https://api.hivekings.com', // (hive) 'https://api.steemitdev.com', // (steem) 'https://steemd.privex.io', // (steem) 'https://api.openhive.network', // (hive) ]; var setWorkingNode = id => new Promise((resolve) => { const currentNode = nodes[id]; fetch(currentNode) .then(resp => resp.json()) .then((json) => { if (json.status !== 'OK' || json.error) { console.error(`Node ${currentNode} not OK. ${JSON.stringify(json, null, 2)}`); resolve({ ok: false }); } else { steem.api.setOptions({ url: currentNode }); resolve({ ok: true }); } }) .catch((err) => { console.error(`Error checking ${currentNode} node state. ${err}`); resolve({ ok: false }); }); }); var confirmHiveResponse = () => new Promise((resolve) => { steem.api.getAccounts( ['gaottantacinque'], (err, response) => { if (err) { console.error(`Unable to confirm HIVE network. ${err}`); resolve(false); return; } const { balance = ' ' } = response[0]; const [currency] = balance.split(' ')[1]; resolve(currency === 'HIVE'); }, ); }); var startChecks = async () => { const healthyNodes = []; for (let id = 0; id < nodes.length; id++) { const currentNode = nodes[id]; console.log(`Checking node ${currentNode}`); const { ok } = await setWorkingNode(id); console.log(`${ok ? 'Connected' : 'Unable to connect'} to ${currentNode}.`); if (ok) { const isHive = await confirmHiveResponse(); console.log(`Confirmed that it uses HIVE: ${isHive}`); if (isHive) healthyNodes.push(currentNode); } } console.log(`Healthy HIVE nodes: ${JSON.stringify(healthyNodes, null, 2)}`); }; startChecks(); ```

Outcome:

https://images.hive.blog/DQmep4MjHWVaLeyTkuws1xmsqtbgPwkwNy7WbcarEBsUciU/image.png

https://images.hive.blog/DQmdHFNxjA1pRAa2biT5LwvMJcbxNd6JkcBNX8jPSG1rqwP/image.png

    🤔🤔🤔 .. investigating..

Originally posted here: https://hive.blog/hive/@gaottantacinque/code-snippet-to-check-which-hive-nodes-are-healthy