Hi,
I'm currently removing a network timeout behavior in a JS library that is used
in Firefox and I'm trying to ensure that I won't consume network resources
forever if the user is on a slow connection.
Consider this xpcshell test:
```
Cu.import("resource://testing-common/httpd.js");
Cu.import("resource://services-common/async.js");
Cu.importGlobalProperties(['fetch']);
function sleep(aMs) {
return new Promise((resolve, error) => {
let timer = Cc["@mozilla.org/timer;1"]
.createInstance(Ci.nsITimer);
timer.initWithCallback({
notify: function () {
resolve();
},
}, aMs, timer.TYPE_ONE_SHOT);
});
}
add_task(function* test_something() {
dump(`-------------- PREFS ----------------\n`);
dump(`response timeout:
${Services.prefs.getIntPref("network.http.response.timeout")}\n`);
dump(`keepalive timeout:
${Services.prefs.getIntPref("network.http.keep-alive.timeout")}\n`);
Services.prefs.setIntPref("network.http.response.timeout", 3);
Services.prefs.setIntPref("network.http.keep-alive.timeout", 115);
const server = new HttpServer();
server.start();
server.registerPathHandler("/test-resource", () => {
Async.promiseSpinningly(sleep(150000));
response.setStatusLine(null, 200, "OK");
response.write("Test resource response");
});
try {
const result = yield
fetch(`http://localhost:${server.identity.primaryPort}/test-resource`);
dump(`${result.status} ${result.statusText}\n`);
dump(`${result.text()}\n`);
} finally {
server.stop(() => {});
}
});
```
Sometimes this test fails with an error message like:
0:23.14 LOG: Thread-1 ERROR Unexpected exception TypeError: NetworkError when
attempting to fetch resource. at resource://services-common/async.js:98
But it seems to fail at strange times -- for example, this time it failed at
the 23 second mark, which doesn't seem related to either the 115-second
keepalive timeout or the 3-second response timeout. And even worse, sometimes
the test succeeds after 150 seconds. What's going on? Is this expected? More
generally, are there any best practices I should use to ensure responsible use
of network resources when writing JS code in Firefox?
Thanks,
Ethan
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