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/*
Tests the Cache-control: stale-while-revalidate response directive.
Purpose is to check we perform the background revalidation when the window is set
and we hit it.
* Make request #1.
- response is from the server and version=1
- max-age=1, stale-while-revalidate=9999
* Switch version of the data on the server and prolong the max-age to not let req #3
do a bck reval at the end of the test (prevent leaks/shutdown races.)
* Make request #2 in 2 seconds (entry should be expired by that time, but fall into
the reval window.)
- response is from the cache, version=1
- a new background request should be made for the data
* Wait for "http-on-background-revalidation" notifying finish of the background reval.
* Make request #3.
- response is from the cache, version=2
* Done.
*/
"use strict";
const { HttpServer } = ChromeUtils.importESModule(
"resource://testing-common/httpd.sys.mjs"
);
let max_age;
let version;
let generate_response = ver => `response version=${ver}`;
function test_handler(metadata, response) {
const originalBody = generate_response(version);
response.setHeader("Content-Type", "text/html", false);
response.setHeader(
"Cache-control",
`max-age=${max_age}, stale-while-revalidate=9999`,
false
);
response.setStatusLine(metadata.httpVersion, 200, "OK");
response.bodyOutputStream.write(originalBody, originalBody.length);
}
function make_channel(url) {
return NetUtil.newChannel({
uri: url,
loadUsingSystemPrincipal: true,
}).QueryInterface(Ci.nsIHttpChannel);
}
async function get_response(channel, fromCache) {
return new Promise(resolve => {
channel.asyncOpen(
new ChannelListener((request, buffer, ctx, isFromCache) => {
Assert.equal(
fromCache,
isFromCache,
`got response from cache = ${fromCache}`
);
resolve(buffer);
})
);
});
}
async function sleep(time) {
return new Promise(resolve => {
do_timeout(time * 1000, resolve);
});
}
async function stop_server(httpserver) {
return new Promise(resolve => {
httpserver.stop(resolve);
});
}
async function background_reval_promise() {
return new Promise(resolve => {
Services.obs.addObserver(resolve, "http-on-background-revalidation");
});
}
add_task(async function () {
let httpserver = new HttpServer();
httpserver.registerPathHandler("/testdir", test_handler);
httpserver.start(-1);
const PORT = httpserver.identity.primaryPort;
const URI = `http://localhost:${PORT}/testdir`;
let response;
version = 1;
max_age = 1;
response = await get_response(make_channel(URI), false);
Assert.equal(response, generate_response(1), "got response ver 1");
await sleep(max_age + 1);
// must specifically wait for the internal channel to finish the reval to make
// the test race-free.
let reval_done = background_reval_promise();
version = 2;
max_age = 100;
response = await get_response(make_channel(URI), true);
Assert.equal(response, generate_response(1), "got response ver 1");
await reval_done;
response = await get_response(make_channel(URI), true);
Assert.equal(response, generate_response(2), "got response ver 2");
await stop_server(httpserver);
});
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