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52 lines
1.5 KiB
JavaScript
52 lines
1.5 KiB
JavaScript
"use strict";
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const assert = require("assert");
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const pipe = require("@promistream/pipe");
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const simpleSink = require("@promistream/simple-sink");
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const fromNodeStream = require("@promistream/from-node-stream");
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const decodeString = require("@promistream/decode-string");
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const parseSitemap = require("@promistream/parse-sitemap");
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module.exports = function farnellScrapeSitemap({ gotSession }) {
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return async function ({ data, createItem }) {
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let resultCount = 0;
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await pipe([
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fromNodeStream.fromReadable(gotSession.stream(data.url)),
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// NOTE: The URL lies, Farnell's sitemaps are not gzipped
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decodeString("utf8"),
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parseSitemap(),
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simpleSink((item) => {
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assert(item.url);
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if (item.type === "sitemap") {
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// NOTE: We are only interested in the sitemaps that enumerate components, not those that list categories etc.
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if (/products_[0-9]+\.xml(\.gz)?/.test(item.url)) {
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createItem({
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id: `farnell:sitemap:${item.url}`,
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tags: [ "farnell:sitemap" ],
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data: { url: item.url }
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});
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resultCount += 1;
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}
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} else if (item.type === "url") {
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if (/\/dp\/[0-9]+$/.test(item.url)) {
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createItem({
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id: `farnell:product:${item.url}`,
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tags: [ "farnell:product" ],
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data: { url: item.url }
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});
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resultCount += 1;
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}
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}
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})
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]).read();
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// If we don't get at least *some* items out of a sitemap, something is wrong - eg. the URL format changed and we are no longer matching anything.
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assert(resultCount > 0);
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};
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};
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