cc9a6db853
Ref: #1379 This takes a naive approach to font-width computation, the most compute-intensive part of rendering badges. 1. Add the widths of the individual characters. - These widths are measured on startup using PDFKit. 2. For each character pair, add a kerning adjustment - The difference between the width of each character pair, and the sum of the characters' separate widths. - These are computed for each character pair on startup using PDFKit. 3. For a string with characters outside the printable ASCII character set, fall back to PDFKit. This branch averaged 0.041 ms in `makeBadge`, compared to 0.144 ms on master, a speedup of 73%. That was on a test of 10,000 consecutive requests (using the `benchmark-performance.sh` script, now checked in). The speedup applies to badges containing exclusively printable ASCII characters. It wouldn't be as dramatic on non-ASCII text. Though, we could add some frequently used non-ASCII characters to the cached set.
41 lines
1.3 KiB
JavaScript
41 lines
1.3 KiB
JavaScript
'use strict';
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const { makeBadgeData: getBadgeData } = require('./badge-data');
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const { metric } = require('./text-formatters');
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// npm downloads count
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function mapNpmDownloads({ camp, cache }, urlComponent, apiUriComponent) {
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camp.route(new RegExp('^/npm/' + urlComponent + '/(.*)\\.(svg|png|gif|jpg|json)$'),
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cache(function(data, match, sendBadge, request) {
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const pkg = encodeURIComponent(match[1]); // eg, "express" or "@user/express"
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const format = match[2];
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const apiUrl = 'https://api.npmjs.org/downloads/point/' + apiUriComponent + '/' + pkg;
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const badgeData = getBadgeData('downloads', data);
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request(apiUrl, function(err, res, buffer) {
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if (err != null) {
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badgeData.text[1] = 'inaccessible';
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sendBadge(format, badgeData);
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return;
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}
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try {
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const totalDownloads = JSON.parse(buffer).downloads || 0;
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const badgeSuffix = apiUriComponent.replace('last-', '/');
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badgeData.text[1] = metric(totalDownloads) + badgeSuffix;
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if (totalDownloads === 0) {
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badgeData.colorscheme = 'red';
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} else {
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badgeData.colorscheme = 'brightgreen';
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}
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sendBadge(format, badgeData);
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} catch(e) {
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badgeData.text[1] = 'invalid';
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sendBadge(format, badgeData);
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}
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});
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}));
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}
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module.exports = {
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mapNpmDownloads
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};
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