Right now TestFastShutdown tries to upload logs to localhost:1234,
which will most likely respond with an error. However if one has an
actual service running on port 1234, it would receive a connection
attempting to POST every time the unit test runs.
Start a local server and direct the upload there instead.
Signed-off-by: Denton Gentry <dgentry@tailscale.com>
Start an HTTP server to accept POST requests, and upload some logs to
it. Check that uploaded logs were received.
Code in logtail:drainPending was not being reliably exercised by other
tests. This shows up in code coverage reports, as lines of code in
drainPending are alternately added and subtracted from code coverage.
This test will reliably exercise and verify this code.
Signed-off-by: Denton Gentry <dgentry@tailscale.com>
If a test calls log.Printf, 'go test' horrifyingly rearranges the
output to no longer be in chronological order, which makes debugging
virtually impossible. Let's stop that from happening by making
log.Printf panic if called from any module, no matter how deep, during
tests.
This required us to change the default error handler in at least one
http.Server, as well as plumbing a bunch of logf functions around,
especially in magicsock and wgengine, but also in logtail and backoff.
To add insult to injury, 'go test' also rearranges the output when a
parent test has multiple sub-tests (all the sub-test's t.Logf is always
printed after all the parent tests t.Logf), so we need to screw around
with a special Logf that can point at the "current" t (current_t.Logf)
in some places. Probably our entire way of using subtests is wrong,
since 'go test' would probably like to run them all in parallel if you
called t.Parallel(), but it definitely can't because the're all
manipulating the shared state created by the parent test. They should
probably all be separate toplevel tests instead, with common
setup/teardown logic. But that's a job for another time.
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
Denton Gentry
Brad Fitzpatrick
Elias Naur
Avery Pennarun
Earl Lee