* `src/node/server.js` can now be run as a script (for normal
operation) or imported as a module (for tests).
* Move shutdown actions to `src/node/server.js` to be close to the
startup actions.
* Put startup and shutdown in functions so that tests can call them.
* Use `await` instead of callbacks.
* Block until the HTTP server is listening to avoid races during
test startup.
* Add a new `shutdown` hook.
* Use the `shutdown` hook to:
* close the HTTP server
* call `end()` on the stats collection to cancel its timers
* call `terminate()` on the Threads.Pool to stop the workers
* Exit with exit code 0 (instead of 1) on SIGTERM.
* Export the HTTP server so that tests can get the HTTP server's
port via `server.address().port` when `settings.port` is 0.
Minimum supported Node version is 6.9.0, but Object.values() was introduced in
Node < 7. Let's use a polyfill if needed.
This will be removed when minimum supported Node version is raised to 8.9.0.
Fixes#3459
When installing dependencies, npm informed us that measured had been deprecated,
and renamed to measured-core. Let's follow the advice, and get rid of the
warning.
npm WARN deprecated measured@1.1.0: This package has been renamed to
measured-core, all versions of measured have been re-released under
measured-core, please update your package and consider updating to the newest
version. See https://github.com/yaorg/node-measured for latest updates.
This package is used to expose a single endpoint ("/stats"), whose output does
not change after this commit.
Fixes#3458
