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Make buildbot log files available via CORS #354
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Using crossorigin.me doesn't work, presumably because it has a size limit that is smaller than our 150mb logs :) |
So it should be really easy to add the Allow-Origin headers on the builder. If not in buildbot, then at least nginx should be able to inject them during its proxy handling. cc @edunham |
I don't think Buildbot 8 has this feature (but it seems 9 does), so +1 for doing this through Nginx. |
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Use Nginx to make Buildbot logs available via CORS Buildbot itself (neither the current version eight nor the upcoming verison nine) does not seem to have built-in CORS support, so use Nginx to supply CORS headers while reverse proxying. This is only needed to download log files, so start with a very conservative set of CORS headers. In particular: - Only support basic CORS requests (those that don't require preflight requests via OPTIONS). This means supporting only GET requests. - Do not allow sending cookies or exposing any headers. In return, whitelist all domains for CORS, and send the Allow-Origin header unconditionally, as the actual value of the Origin header does not matter. Because we are using proxy_pass to reverse proxy Buildbot, we need to tell Nginx to always add the CORS headers, instead of only adding them for successful responses. (I.e. add CORS headers even for 404s and other erroneous status codes). This features is not available in the Nginx packaged for Ubuntu Trusty, so replace it with a newer Nginx from upstream Nginx's respositories. Because Debian/Ubuntu modify the default configuration for Nginx, use Salt to ensure that the installed nginx.conf properly looks into the sites-enabled directory (which is a Debian-ism) and that the default handler in /etc/nginx/conf.d/ is purged. In order to only support CORS on GET requests, use the 'if' directive. However, because Nginx's if is evil, (https://www.nginx.com/resources/wiki/start/topics/depth/ifisevil/) add a bunch of tests to ensure that the configuration is working. Also, update the Nginx states to follow Salt best practices. Fixes #354. Blocked on #374 because I encountered various failures while upgrading from the Ubuntu Nginx to upstream Nginx, and I'd like to make sure I caught them all. <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/saltfs/375) <!-- Reviewable:end -->
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I'm trying to add XHR support to http://hoppipolla.co.uk/410/reftest-analyser-structured.xhtml so we could make investigating reftest failures really easy. Unfortunately attempts to grab URLs like
http://build.servo.org/builders/mac-rel-css/builds/711/steps/test/logs/test-css.log/text
via XHR end up with CORS errors like:The text was updated successfully, but these errors were encountered: