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jsl data - first line is structure

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This commit is contained in:
Jan Prochazka
2020-06-10 21:53:43 +02:00
parent 1695fb2fd8
commit ca079d5dce
2 changed files with 28 additions and 6 deletions
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30
packages/api/src/controllers/jsldata.js
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@@ -4,6 +4,22 @@ const lineReader = require('line-reader');
const { jsldir } = require('../utility/directories');
const socket = require('../utility/socket');
function readFirstLine(file) {
return new Promise((resolve, reject) => {
lineReader.open(file, (err, reader) => {
if (err) reject(err);
if (reader.hasNextLine()) {
reader.nextLine((err, line) => {
if (err) reject(err);
resolve(line);
});
} else {
resolve(null);
}
});
});
}
module.exports = {
openedReaders: {},
@@ -37,7 +53,10 @@ module.exports = {
openReader(jslid) {
// console.log('OPENING READER');
console.log('OPENING READER, LINES=', fs.readFileSync(path.join(jsldir(), `${jslid}.jsonl`), 'utf-8').split('\n').length);
console.log(
'OPENING READER, LINES=',
fs.readFileSync(path.join(jsldir(), `${jslid}.jsonl`), 'utf-8').split('\n').length
);
const file = path.join(jsldir(), `${jslid}.jsonl`);
return new Promise((resolve, reject) =>
lineReader.open(file, (err, reader) => {
@@ -58,15 +77,18 @@ module.exports = {
if (!this.openedReaders[jslid]) {
await this.openReader(jslid);
}
await this.readLine(jslid); // skip structure
while (this.openedReaders[jslid].readedCount < offset) {
await this.readLine(jslid);
}
},
getInfo_meta: 'get',
getInfo({ jslid }) {
const file = path.join(jsldir(), `${jslid}.jsonl.info`);
return JSON.parse(fs.readFileSync(file, 'utf-8'));
async getInfo({ jslid }) {
const file = path.join(jsldir(), `${jslid}.jsonl`);
const firstLine = await readFirstLine(file);
if (firstLine) return JSON.parse(firstLine);
return null;
},
getRows_meta: 'get',