skia2/include/private/BUILD.bazel
Kevin Lubick acab911351 [bazel] Make use of test_on_env to spin up server for gms
In order to extract the PNG files produced by our CanvasKit gms,
we need our JS tests to POST them to a server which can write to
disk. The easiest way to do this is to use the test_on_env
rule defined in the Skia Infra repo for exactly this purpose.

This required https://skia-review.googlesource.com/c/buildbot/+/510717
to be able to configure the binary correctly and
https://skia-review.googlesource.com/c/buildbot/+/511862, for nicer
debugging so the skia-infra dep was updated via the following commands:
$ go get go.skia.org/infra@d8a552a29e
$ go mod download
$ make -C infra/bots train
$ make -C bazel gazelle_update_repo
This caused many automated changes to infra/bots/tasks.json

The flow is:
1. User types bazelisk test :hello_world_test_with_env
2. The test_on_env rule starts gold_test_env and waits
   for the file defined in $ENV_READY_FILE to be created.
3. gold_test_env starts a web server on a random port. It
   writes this port number to $ENV_DIR/port. Then, it
   creates $ENV_READY_FILE to signal ready.
4. test_on_env sees the ready file and then starts the
   karma_test rule. (Reminder: this is a bash script
   which starts karma using the Bazel-bundled chromium).
5. The karma_test rule runs the karma.bazel.js file (which
   has been injected with some JS code to fill in Bazel
   paths and settings) using Bazel-bundled node. This reads
   in the port file and sets up a Karma proxy to redirect
   /gold_rpc/report to http://localhost:PORT/report
6. The JS tests run via Karma (and do assertions via Jasmine).
   Some tests, the gms, make POST requests to the proxy.
7. gold_test_env gets these POST requests writes the images
   to a special Bazel folder on disk as defined by
   $TEST_UNDECLARED_OUTPUTS_DIR.
8. test_on_env identifies that the tests finish (because the
   karma_test script returns 0). It sends SIGINT to gold_test_env.
9. gold_test_env stops the webserver. The special Bazel folder
   will zip up anything inside it and make it available for
   future rules (e.g. a rule that will upload to Gold via goldctl).

Suggested Review Order:
 - bazel/karma_test.bzl to see the test_on_env rule bundled into
   the karma_test macro. I chose to put it there because it might
   be confusing to have to define both a karma_test and test_on_env
   rule in the same package but not be able to call one because it
   will fail to talk to the server.
 - gold_test_env.go to see how the appropriate files are written
   to signal the environment is ready and the handlers are set up.
 - karma.bazel.js to see how we make our own proxy given the
   port from the env binary. The fact that we could not create
   our own proxy with the existing karma_test rule was why the
   chain ending in https://skia-review.googlesource.com/c/skia/+/508797
   had to be abandoned.
 - tests/*.js to see how the environment is probed via /healthz
   and then used to make POST requests with data.
 - Everything else.

Change-Id: I32a90def41796ca94cf187d640cfff8e262f85f6
BUG: skia:12541
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/510737
Reviewed-by: Leandro Lovisolo <lovisolo@google.com>
2022-02-28 14:05:54 +00:00

549 lines
12 KiB
Python

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