Changes to fake resolver:
- Add `WaitForReresolutionRequest()` method to fake resolver response
generator to allow tests to tell when re-resolution has been requested.
- Change fake resolver response generator API to have only one mechanism
for injecting results, regardless of whether the result is an error or
whether it's triggered by a re-resolution.
Changes to grpclb_end2end_test:
- Change balancer interface such that instead of setting a list of
responses with fixed delays, the test can control exactly when each
response is set.
- Change balancer impl to always send the initial LB response, as
expected by the grpclb protocol.
- Change balancer impl to always read load reports, even if load
reporting is not expected to be enabled. (The latter case will still
cause the test to fail.) Reads are done in a different thread than
writes.
- Allow each test to directly control how many backends and balancers
are started and the client load reporting interval, so that (a) we don't
waste resources starting servers we don't need and (b) there is no need
to arbitrarily split tests across different test classes.
- Add timeouts to `WaitForAllBackends()` functionality, so that tests
will fail with a useful error rather than timing out.
- Improved ergonomics of various helper functions in the test framework.
In the process of making these changes, I found a couple of bugs:
- A bug in pick_first, which I fixed in #34885.
- A bug in grpclb, in which we were using the wrong condition to decide
whether to propagate a re-resolution request from the child policy,
which I've fixed in this PR. (This bug probably originated way back in
#18344.)
This should address a lot of the flakes seen in grpclb_e2e_test
recently.
Built upon @Vignesh2208 's work in #33156
This adds ref counting to the http_proxy fixture object, fixing test
flakes identified by the introduction of EventEngine listeners. Proxy
objects were either being deleted twice, or sometimes not at all,
resulting in two different sorts of flakes.
Fixes two issue with the `event_engine_listener` experiment:
* a race in `on_connect` with the read/write path
* a long delay due to pollset_work being effectively a `sleep` in the
EventEngine shim implementation
Also break the filter stack and promise based versions apart so that I
can re-understand this code.
---------
Co-authored-by: ctiller <ctiller@users.noreply.github.com>
Earlier, the grpc message-length prefix for outgoing data messages was
incorrectly being counted towards `data_bytes` instead of
`framing_bytes`. This PR fixes it.
Note that the incoming stats collection properly attributes the grpc
message-length prefix to `framing_bytes`.
This change will affect all stats plugins (OpenCensus and OpenTelemetry)
that make use of this information for metrics.
Let's not merge this PR this week, maybe 2023-10-23 at the earliest.
This will allow time for flakes to shake out of the listener experiments
(enabled in https://github.com/grpc/grpc/pull/34700) in isolation of
client problems.
Ditch the old priority scheme for ordering filters, instead explicitly
mark up before/after constraints.
---------
Co-authored-by: ctiller <ctiller@users.noreply.github.com>
Just seeing data flowing in after a ping is enough to establish liveness
of a connection, and so we can limit keepalive timeouts to that. Ping
timeouts are necessary for protocol correctness, but may be stuck behind
other traffic, so give them a little more of a grace period.
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Co-authored-by: ctiller <ctiller@users.noreply.github.com>
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Fix b/304114403
- adds a new experimental tracer useful for diagnosing ping timeout
failures in unit tests
- adds a pair of experimental tracers for fuzzing event engine
- fix the behavior of FuzzingEventEngine so that a RunAfter(0, ...) runs
in the same tick
- up the rate of sends (reduce the send delay) so we guarantee to be
able to send 200kb/sec in fuzzed e2e unit tests
---------
Co-authored-by: ctiller <ctiller@users.noreply.github.com>
Isolate ping callback tracking to its own file.
Also takes the opportunity to simplify keepalive code by applying the
ping timeout to all pings.
Adds an experiment to allow multiple pings outstanding too (this was
originally an accidental behavior change of the work, but one that I
think may be useful going forward).
---------
Co-authored-by: ctiller <ctiller@users.noreply.github.com>
Craig Tiller
Vignesh Babu
Mark D. Roth
Luwei Ge
AJ Heller
Yash Tibrewal
Yijie Ma
Eugene Ostroukhov