Add a configurable default backend. #426
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For all requests that don't match any path or path prefix in the database, forward the request to ROUTER_DEFAULT_BACKEND_URL. This defaults to `government-frontend`, which is where 93% of routes go. This should allow shrinking the route database by an order of magnitude as well as making it a little easier to eliminate Router in the long run. We no longer respond 503 to all requests when the route database is empty. This feature was presumably conceived as a kind of lameduck mode (albeit somewhat buggy). We're almost certainly better off without it now that an empty database doesn't mean we're completely broken.
- Use common terminology e.g. "HTTP method". - Make the `Describe` / `It` test names fit together better. - Trivial style cleanup to reduce boilerplate somewhat.
- Remove unnecessary conditionals around time.Sleep(). - Use const.
This also gets rid of change-detectors on error response bodies (which we don't care about, because the edge caches replace them with prettier ones anyway). https://onsi.github.io/gomega/#working-with-http-responses Generated with: ```sh g grep -l resp.StatusCode integration_tests | xargs gsed -i \ 's/Expect(resp.StatusCode)\.To(Equal(\([0-9]\{3\}\)))/Expect(resp).To(HaveHTTPStatus(\1))/' ```
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Thanks Chris! Agree, this seems like a sensible change. I'm pretty sure that Rails will return 404 for a route it doesn't have - but I think government-frontend has wildcard route that catches everything and then gets handled by the content-item controller. I think there is assumption that there must be a content item in the Content Store if request is routed from router - so unsure what happens it raise an exception. However, it might be safe due to the rescue clauses.
Worth testing to see how government frontend behaves.
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Ohh good shout, thanks! I'll go explore that before I think about rolling this out 🙇 |
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Did some exploratory testing in the staging environment and all seems happy apart from organisations pages like these: (links unfortunately need VPN or they'll error)
All the other gov-frontend document types seem ok though 🧐 I'll set this back to draft while I figure out what's going on there. |
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Ughhh it's because those pages have paths that shadow shorter path prefixes that go elsewhere 😫 (why, GOV.UK, whyyyyy) production:PRIMARY> db.routes.find({
incoming_path: '/government/organisations/hm-revenue-customs'
})
{
"_id" : ObjectId("5ae1e0b545a5a01908a01215"),
"backend_id" : "collections",
"disabled" : false,
"handler" : "backend",
"incoming_path" : "/government/organisations/hm-revenue-customs",
"route_type" : "prefix",
"updated_at" : ISODate("2023-05-15T16:08:31.165Z")
}
production:PRIMARY> db.routes.find({
incoming_path: '/government/organisations/hm-revenue-customs/contact/excise-enquiries'
})
{
"_id" : ObjectId("546dcf7e45a5a0a5a2000121"),
"backend_id" : "government-frontend",
"disabled" : false,
"handler" : "backend",
"incoming_path" : "/government/organisations/hm-revenue-customs/contact/excise-enquiries",
"route_type" : "exact"
} |
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Easy enough to just put a fancier filter on the |
For all requests that don't match any path or path prefix in the database, forward the request to ROUTER_DEFAULT_BACKEND_URL. This defaults to
government-frontend, which is where 93% of routes go.This should allow shrinking the route database by an order of magnitude as well as making it a little easier to eliminate Router in the long run.
We no longer respond 503 to all requests when the route database is empty. That feature was presumably conceived as a kind of lameduck mode (albeit somewhat buggy). We're almost certainly better off without it now that an empty database doesn't mean we're completely broken.