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[INTERNAL] testRunner middleware: Use ETag caching #354

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[INTERNAL] testRunner middleware: Use ETag caching #354

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39 changes: 31 additions & 8 deletions lib/middleware/testRunner.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,20 +5,43 @@ const path = require("path");
const mime = require("mime-types");
const parseurl = require("parseurl");
const log = require("@ui5/logger").getLogger("server:middleware:testRunner");
const etag = require("etag");
const fresh = require("fresh");

const testRunnerResourceRegEx = /\/test-resources\/sap\/ui\/qunit\/(testrunner\.(html|css)|TestRunner.js)$/;
const resourceCache = {};

function serveResource(res, resourcePath, resourceContent) {
function isFresh(req, res) {
return fresh(req.headers, {
"etag": res.getHeader("ETag")
});
}

async function readResourceInfo(resourceName) {
const content = await readFile(path.join(__dirname, "testRunner", resourceName), {encoding: "utf8"});
return {
content,
etag: etag(content)
};
}

function serveResource(req, res, resourcePath, resourceInfo) {
const type = mime.lookup(resourcePath) || "application/octet-stream";
const charset = mime.charset(type);
const contentType = type + (charset ? "; charset=" + charset : "");
res.setHeader("Content-Type", contentType);

// resources served by this middleware do not change often
res.setHeader("Cache-Control", "public, max-age=1800");
// Enable ETag caching
res.setHeader("ETag", resourceInfo.etag);

res.setHeader("Content-Type", contentType);
res.end(resourceContent);
if (isFresh(req, res)) {
// client has a fresh copy of the resource
res.statusCode = 304;
res.end();
return;
}

res.end(resourceInfo.content);
}

/**
Expand All @@ -40,14 +63,14 @@ function createMiddleware({resources}) {
log.verbose(`Serving ${pathname}`);
let pResource;
if (!resourceCache[pathname]) {
pResource = readFile(path.join(__dirname, "testRunner", resourceName), {encoding: "utf8"});
pResource = readResourceInfo(resourceName);
resourceCache[pathname] = pResource;
} else {
pResource = resourceCache[pathname];
}

const resourceContent = await pResource;
serveResource(res, pathname, resourceContent);
const resourceInfo = await pResource;
serveResource(req, res, pathname, resourceInfo);
} else {
next();
}
Expand Down