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transform

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Cat /dev/Nulo 2023-12-23 00:19:04 -03:00
parent a54db788df
commit 61727faa84
1 changed files with 27 additions and 17 deletions
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44
scraper/bench.ts
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@ -1,7 +1,6 @@
// import { run, bench, group, baseline } from "mitata"; // import { run, bench, group, baseline } from "mitata";
import { createReadStream } from "node:fs"; import { createReadStream } from "node:fs";
import { Writable } from "node:stream"; import { Readable } from "stream";
import { pipeline } from "node:stream/promises";
import { getCarrefourProduct } from "./carrefour.js"; import { getCarrefourProduct } from "./carrefour.js";
import { WARCParser } from "warcio"; import { WARCParser } from "warcio";
// import { ZSTDDecompress } from "simple-zstd"; // import { ZSTDDecompress } from "simple-zstd";
@ -44,25 +43,36 @@ await bench("warc", async () => {
// ).stdout; // ).stdout;
const warc = Bun.stdin.stream(); const warc = Bun.stdin.stream();
// const warc = Readable.toWeb(process.stdin);
// const warc = process.stdin; let buffer: Uint8Array[] = [];
const transform = new TransformStream<Uint8Array, Buffer>({
let arrays: Buffer[] = []; transform(chunk, controller) {
buffer.push(chunk);
const myWritable = new Writable({ if (buffer.reduce((prev, curr) => prev + curr.length, 0) > 1024 * 1024) {
highWaterMark: 1024 * 1024 * 1024, controller.enqueue(Buffer.concat(buffer));
writev(chunks, callback) {}, buffer = [];
}
},
flush(controller) {
controller.enqueue(Buffer.concat(buffer));
},
}); });
for await (const chunk of warc) { warc.pipeTo(transform.writable);
let arrays: Buffer[] = [];
let n = 0;
for await (const chunk of transform.readable) {
console.debug(n);
// console.debug(chunk.length); // console.debug(chunk.length);
const b = Buffer.from(chunk); const b = Buffer.from(chunk);
arrays.push(b); arrays.push(b);
if ( // if (
arrays.reduce((prev, curr) => prev + curr.length, 0) < // arrays.reduce((prev, curr) => prev + curr.length, 0) <
1024 * 1024 * 1024 // 1024 * 1024 * 1024
) // )
continue; // continue;
let buf: Buffer; let buf: Buffer;
while ( while (
((buf = arrays.length === 1 ? arrays[0] : Buffer.concat(arrays)), ((buf = arrays.length === 1 ? arrays[0] : Buffer.concat(arrays)),
@ -94,8 +104,8 @@ await bench("warc", async () => {
} }
const length = parseInt(fields.get("Content-Length")); const length = parseInt(fields.get("Content-Length"));
const content = buf.subarray(0, length); const content = buf.subarray(0, length);
console.debug(fields.get("WARC-Date"), content.length); // console.debug(fields.get("WARC-Date"), content.length);
n++;
arrays = [ arrays = [
buf.subarray(until + crlfcrlfB.length + length + crlfcrlfB.length), buf.subarray(until + crlfcrlfB.length + length + crlfcrlfB.length),
]; ];