Test for reading a text file out of a tar.gz archive (https://github.com/nodejs/node/issues/30885).

tap-read.js

const fs = require('fs');
const readline = require('readline');
const util = require('util');
const tar = require('tar');
const zlib = require('zlib');
const test = require("tap").test;


function get_nsconf (archive, nsconf) {
        return new Promise((resolve, reject) => {
                if (!nsconf) { nsconf = '/nsconfig/ns.conf' }
                console.debug('----> Parsing NetScaler backup: '+archive);
                fs.createReadStream(archive).on('error', console.error)
                        .pipe(zlib.createUnzip())
                        .pipe(new tar.Parse())
                        .on('entry', entry => {
                                if (entry.path.endsWith(nsconf)) {
                                        if ('File' !== entry.type) {
                                                throw new Error('Wrong type for entry: '+nsconf+' : '+entry.type);
                                        }
                                        resolve({tar: archive, entry: entry});
                                } else {
                                        entry.resume();
                                }
                        })
        });
}

test('NetScaler config read test', t => {
        const archive = './tarball.tar.gz';
        const nsconf = 'tap-tar.js';
        get_nsconf(archive, nsconf).then(nsc => {
                let count = 0;
                // processing nsc as resolved by get_nsconf():
                console.debug('----> Found: '+nsc.entry.path);
                t.ok(nsc.tar == archive);
                t.ok(nsc.entry != undefined);
                readline.createInterface({
                        input: nsc.entry
                }).on('line', line => {
                        count++
                        console.log(line);
                        t.ok(null !== line && undefined !== line);
                }).on('close', () => {
                        console.log('----> File closed. Line count = '+count);
                        t.end();
                });
                console.debug('----> Closing file. Line count = '+count);
        }).catch(err => {
                console.log('Error: ', err, '\n', util.inspect(err.stack));
        });
});