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index.js
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index.js
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"use strict"
import { createReadStream, statSync } from 'node:fs';
import http from 'node:http';
import https from 'node:https';
import papa from 'papaparse';
import os from 'node:os';
import { extname } from 'node:path';
import { Transform } from 'node:stream';
import { StringDecoder } from 'node:string_decoder';
import { createGunzip, createBrotliDecompress } from 'node:zlib';
Array.prototype.forEachAsync = forEachAsync;
function forEachAsync() {
let callback, maxParallel = os.cpus().length;
switch (arguments.length) {
case 1: [callback] = arguments; break;
case 2: [callback, maxParallel] = arguments; break;
default:
throw Error('forEachAsync( callback, [ maxParallel ] )')
}
let list = this;
return new Promise((resolve, reject) => {
let running = 0, index = 0, finished = false;
queueMicrotask(next);
function next() {
if (finished) return;
if (running >= maxParallel) return;
if (index >= list.length) {
if (running === 0) {
finished = true;
resolve();
return
}
return
}
running++;
let currentIndex = index++;
callback(list[currentIndex], currentIndex)
.then(() => {
running--;
queueMicrotask(next)
})
.catch(err => {
finished = true;
reject(err);
})
if (running < maxParallel) queueMicrotask(next);
}
})
}
export async function streamFileData(filename, opt) {
if (!opt) opt = {};
let stream, size;
if (filename.startsWith('http://')) {
stream = await getHttpStream(http, filename)
} else if (filename.startsWith('https://')) {
stream = await getHttpStream(https, filename)
} else {
size = statSync(filename).size;
stream = createReadStream(filename);
}
if (stream && stream.headers && stream.headers['content-length']) {
size = parseInt(stream.headers['content-length'], 10);
}
if (opt.progress && size) {
let pos = 0;
let progress = (typeof opt.progress === 'function') ? opt.progress : createProgressBar;
progress = progress(size);
stream.on('data', chunk => {
pos += chunk.length;
progress.update(pos);
})
stream.on('close', () => progress.close());
}
if (filename.endsWith('.gz')) {
filename = filename.slice(0, -3);
stream = stream.pipe(createGunzip())
} else if (filename.endsWith('.br')) {
filename = filename.slice(0, -3);
stream = stream.pipe(createBrotliDecompress())
}
if (/\.[ct]sv$/.test(filename)) {
if (opt.fast) {
return getCsvParserFast(stream);
} else {
return getCsvParser(stream);
}
} else if (/\.(geo)?json(l|seq)$/.test(filename)) {
return getJsonParser(stream);
} else {
throw new Error('Unknown file extension: ' + extname(filename));
}
function getHttpStream(lib, url) {
return new Promise(res => {
lib.request(url, stream => res(stream)).end();
})
}
function getSplitter(matcher = /\r?\n/, format = 'utf8') {
let last = '';
let decoder = new StringDecoder(format);
return new Transform({
autoDestroy: true,
readableObjectMode: true,
transform,
flush,
})
function transform(chunk, enc, cb) {
last += decoder.write(chunk);
let lines = last.split(matcher);
let lastIndex = lines.length - 1;
for (let i = 0; i < lastIndex; i++) this.push(lines[i])
last = lines[lastIndex];
cb();
}
function flush(cb) {
this.push(last);
cb();
}
}
function getCsvParserFast(stream) {
let header, separator;
stream = stream.pipe(getSplitter());
return stream.pipe(new Transform({
autoDestroy: true,
readableObjectMode: true,
transform: (line, enc, cb) => {
line = line.toString();
if (header) {
if (line.length < 1) return cb();
line = line.split(separator);
cb(null, Object.fromEntries(header.map((key, i) => [key, line[i]])));
} else {
separator = ',';
header = line.split(separator);
if (line.split(';').length > header.length) {
separator = ';';
header = line.split(separator);
}
if (line.split('\t').length > header.length) {
separator = '\t';
header = line.split(separator);
}
cb(null);
}
},
}))
}
function getCsvParser(stream) {
let parser = papa.parse(papa.NODE_STREAM_INPUT, { header: true });
return stream.pipe(parser);
}
function getJsonParser(stream) {
stream = stream.pipe(getSplitter());
return stream.pipe(new Transform({
autoDestroy: true,
readableObjectMode: true,
transform: (line, enc, cb) => {
cb(null, (line.length > 0) ? JSON.parse(line) : null)
},
}))
}
}
export function createProgressBar(total, timeStep = 1000) {
const MAX_STATES = 30;
let index = 0;
let nextUpdateTime = Date.now();
const previousStates = [];
update(0);
return { update, close, increment };
function log() {
let time = Date.now();
const progress = 100 * index / total;
let message = `\r\x1b[K ${index}/${total} - ${progress.toFixed(2)} %`;
const newState = { index, time };
const lastState = previousStates[previousStates.length - 1] || newState;
if ((lastState.index !== index) || (lastState === newState)) {
previousStates.unshift(newState);
while (previousStates.length > MAX_STATES) previousStates.pop();
}
if (lastState.index < index) {
const speed = 1000 * (index - lastState.index) / (time - lastState.time);
let speedString;
if (speed >= 1e6) {
speedString = (speed / 1000).toFixed(0) + ' K'
} else if (speed >= 1e5) {
speedString = (speed / 1000).toFixed(1) + ' K'
} else if (speed >= 1e4) {
speedString = (speed / 1000).toFixed(2) + ' K'
} else if (speed >= 1e3) {
speedString = speed.toFixed(0)
} else if (speed >= 1e2) {
speedString = speed.toFixed(1)
} else if (speed >= 1e1) {
speedString = speed.toFixed(2)
} else {
speedString = speed.toFixed(3)
}
const eta = (total - index) / speed;
const etaString = [
Math.floor(eta / 3600).toFixed(0),
(Math.floor(eta / 60) % 60 + 100).toFixed(0).slice(1),
(Math.floor(eta) % 60 + 100).toFixed(0).slice(1),
].join(':');
message += ` - ${speedString}/s - ${etaString}`;
}
process.stderr.write(message);
}
function update(value) {
index = value;
if (Date.now() >= nextUpdateTime) {
log();
nextUpdateTime += timeStep;
}
}
function increment(value = 1) {
update(index + value);
}
function close() {
index = total;
log();
process.stderr.write(`\n`);
}
}