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CachingMiddleware: Asyncify

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Richard Hansen 2021-02-27 00:08:29 -05:00 • committed by webzwo0i
parent 0284d49522
commit f86df5322e
2 changed files with 99 additions and 112 deletions
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2
src/node/hooks/express/static.js
View file

@ -31,7 +31,7 @@ const getTar = async () => {
exports.expressCreateServer = async (hookName, args) => {
// Cache both minified and static.
const assetCache = new CachingMiddleware();
args.app.all(/\/javascripts\/(.*)/, assetCache.handle);
args.app.all(/\/javascripts\/(.*)/, assetCache.handle.bind(assetCache));
// Minify will serve static files compressed (minify enabled). It also has
// file-specific hacks for ace/require-kernel/etc.

51
src/node/utils/caching_middleware.js
View file

@ -16,13 +16,14 @@
* limitations under the License.
*/
const async = require('async');
const Buffer = require('buffer').Buffer;
const fs = require('fs');
const fsp = fs.promises;
const path = require('path');
const zlib = require('zlib');
const settings = require('./Settings');
const existsSync = require('./path_exists');
const util = require('util');
/*
* The crypto module can be absent on reduced node installations.
@ -79,6 +80,10 @@ if (_crypto) {
module.exports = class CachingMiddleware {
handle(req, res, next) {
this._handle(req, res, next).catch((err) => next(err || new Error(err)));
}
async _handle(req, res, next) {
if (!(req.method === 'GET' || req.method === 'HEAD') || !CACHE_DIR) {
return next(undefined, req, res);
}
@ -92,12 +97,11 @@ module.exports = class CachingMiddleware {
const url = new URL(req.url, 'http://localhost');
const cacheKey = generateCacheKey(url.pathname + url.search);
fs.stat(`${CACHE_DIR}minified_${cacheKey}`, (error, stats) => {
const modifiedSince = (req.headers['if-modified-since'] &&
new Date(req.headers['if-modified-since']));
const lastModifiedCache = !error && stats.mtime;
if (lastModifiedCache && responseCache[cacheKey]) {
req.headers['if-modified-since'] = lastModifiedCache.toUTCString();
const stats = await fsp.stat(`${CACHE_DIR}minified_${cacheKey}`).catch(() => {});
const modifiedSince =
req.headers['if-modified-since'] && new Date(req.headers['if-modified-since']);
if (stats != null && stats.mtime && responseCache[cacheKey]) {
req.headers['if-modified-since'] = stats.mtime.toUTCString();
} else {
delete req.headers['if-modified-since'];
}
@ -125,8 +129,7 @@ module.exports = class CachingMiddleware {
headers['content-encoding'] = 'gzip';
}
const lastModified = (headers['last-modified'] &&
new Date(headers['last-modified']));
const lastModified = headers['last-modified'] && new Date(headers['last-modified']);
if (statusCode === 200 && lastModified <= modifiedSince) {
res.writeHead(304, headers);
@ -174,30 +177,15 @@ module.exports = class CachingMiddleware {
res.write = (data, encoding) => {
buffer += data.toString(encoding);
};
res.end = (data, encoding) => {
async.parallel([
(callback) => {
const path = `${CACHE_DIR}minified_${cacheKey}`;
fs.writeFile(path, buffer, (error, stats) => {
callback();
});
},
(callback) => {
const path = `${CACHE_DIR}minified_${cacheKey}.gz`;
zlib.gzip(buffer, (error, content) => {
if (error) {
callback();
} else {
fs.writeFile(path, content, (error, stats) => {
callback();
});
}
});
},
], () => {
res.end = async (data, encoding) => {
await Promise.all([
fsp.writeFile(`${CACHE_DIR}minified_${cacheKey}`, buffer).catch(() => {}),
util.promisify(zlib.gzip)(buffer)
.then((content) => fsp.writeFile(`${CACHE_DIR}minified_${cacheKey}.gz`, content))
.catch(() => {}),
]);
responseCache[cacheKey] = {statusCode: status, headers};
respond();
});
};
} else if (status === 304) {
// Nothing new changed from the cached version.
@ -211,6 +199,5 @@ module.exports = class CachingMiddleware {
};
next(undefined, req, res);
});
}
};