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bin/importSqlFile.js: Read the file one line at a time 

This avoids running out of memory if the file is large.
This commit is contained in:
Richard Hansen 2021-06-17 19:41:44 -04:00
parent 485538bd79
commit 4b3e47bd23
1 changed files with 7 additions and 10 deletions
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17
src/bin/importSqlFile.js
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@ -48,6 +48,7 @@ const unescape = (val) => {
(async () => {
const fs = require('fs');
const log4js = require('log4js');
const readline = require('readline');
const settings = require('../node/utils/Settings');
const ueberDB = require('ueberdb2');
@ -71,14 +72,12 @@ const unescape = (val) => {
await util.promisify(db.init.bind(db))();
log('done');
log('open output file...');
const lines = fs.readFileSync(sqlFile, 'utf8').split('\n');
log(`Opening ${sqlFile}...`);
const stream = fs.createReadStream(sqlFile, {encoding: 'utf8'});
const count = lines.length;
log(`Reading ${sqlFile}...`);
let keyNo = 0;
process.stdout.write(`Start importing ${count} keys...\n`);
lines.forEach((l) => {
for await (const l of readline.createInterface({input: stream, crlfDelay: Infinity})) {
if (l.substr(0, 27) === 'REPLACE INTO store VALUES (') {
const pos = l.indexOf("', '");
const key = l.substr(28, pos - 28);
@ -88,11 +87,9 @@ const unescape = (val) => {
console.log(`unval: ${unescape(value)}`);
db.set(key, unescape(value), null);
keyNo++;
if (keyNo % 1000 === 0) {
process.stdout.write(` ${keyNo}/${count}\n`);
}
if (keyNo % 1000 === 0) log(` ${keyNo}`);
}
});
}
process.stdout.write('\n');
process.stdout.write('done. waiting for db to finish transaction. ' +
'depended on dbms this may take some time..\n');