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Update ipfsHelper.js #7

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Update ipfsHelper.js #7

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28 changes: 17 additions & 11 deletions scripts/ipfsHelper.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,22 +5,28 @@ const config = require('config');
// https://stackoverflow.com/questions/36856232/write-add-data-in-json-file-using-node-js
// Accepts json data and stores in specified filePath.
// If the file does not exists in specified location, it creates it
const lockfile = require('proper-lockfile');

const storeDataToFile = async (jsonData) => {
const filePath = path.join(__dirname, config.get('ipfsFile.location'));
let release;

try {
const filePath = path.join(__dirname, config.get('ipfsFile.location'));
const ipfsFileExists = await fileExists(filePath);
if (!ipfsFileExists) {
console.log('ipfsFileExists: ', ipfsFileExists);
// First time creating an empty file with [].
// We will be storing all ipfsHashes as array of objects
await fs.writeFile(filePath, JSON.stringify([]));
// Acquire lock (wait if another process is writing)
release = await lockfile.lock(filePath, { retries: 3 });

let json = [];
try {
const data = await fs.readFile(filePath, 'utf8');
json = JSON.parse(data);
} catch (err) {
if (err.code !== 'ENOENT') throw err;
}
const data = await fs.readFile(filePath, 'utf8');
const json = JSON.parse(data);

json.push(jsonData);
await fs.writeFile(filePath, JSON.stringify(json));
} catch (err) {
console.log('Error occured while storing data to file', err);
} finally {
if (release) await release(); // Release lock
}
};

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