* MM-23800: remove goroutineID and stack printing
Each hub has a goroutineID which is calculated with a known hack.
The FAQ clearly explains why goroutines don't have an id:
https://golang.org/doc/faq#no_goroutine_id.
We only added that because sometimes the hub would be deadlocked and
having the goroutineID would be useful when getting the stack trace.
This is also problematic in stress tests because the hubs would
frequently get overloaded and the logs would unnecessarily have stack traces.
But that was in the past, and we have done extensive testing with
load tests and fuzz testing to smooth any rough edges remaining.
Including adding additional metrics for hub buffer size.
Monitoring the metrics is a better way to approach this problem.
Therefore, we remove these kludges from the code.
* Also remove deadlock checking code
There is no need for that anymore since
we are getting rid of the stack printing anyways.
Let's do a wholesale refactor and clean up the codebase.
* MM-23805: Refactor web_hub
This is a beginning of the refactoring of the websocket code.
To start off with, we unexport some methods and constants which did not
need to be exported. There are more remaining but some are out of scope for this PR.
The main chunk of refactor is to unexport the webconn send channel
which was the main cause of panics. Since we were directly sending
to the connection from various parts of the codebase, it would be possible
that the send channel would be closed and we could still send a message.
This would crash the server.
To fix this, we refactor the code to centralize all sending from the main
hub goroutine. This means we can leverage the connections map to check
if the connection exists or not, and only then send the message.
We also move the cluster calls to cluster.go.
* bring back cluster code inside hub
* Incorporate review comments
* Address review comments
* rename index
* MM-23807: Refactor web_conn
- Unexport some struct fields and constants which are not necessary
to be accessed from outside the package. This will help us moving
the entire websocket handling code to a separate package later.
- Change some empty string checks to check for empty string rather
than doing a len check which is more idiomatic. Both of them compile
to the same code. So it doesn't make a difference performance-wise.
- Remove redundant ToJson calls to get the length.
- Incorporate review comments
- Unexport some more methods
* Fix field name
* Run make app-layers
* Add note on hub check
Hubs property has been detected by the race condition detector
as a possible one because we could set the Hubs variable
and also we're spawning goroutines that could ask for that property
This condition is not happening right now because we're setting the
Hubs variable in the server start and after that, we're spawning the
goroutines but the tests are failing because of this and in the future
this could be a problem
* Make WebSocketEvent type immutable
* Update code to use updated immutable WebSocketEvent type
* Export WebSocketEvent fields and mark them as deprecated
* Consistent license message for all the go files
* Fixing the last set of unconsistencies with the license headers
* Addressing PR review comments
* Fixing busy.go and busy_test.go license header
This change is being made to address an issue where the go-i18n
translation library would result in partial-translations when a
given language dictionary was missing a given plural keyword. The
improvement made here leads the translation library to try an
'other' keyword lookup if the first plural keyword fails to have
a value.
This change was not accepted upstream due to concern regarding
changing the behavior, so we are using a fork at this time to
address the issue.
* Rerouted the unit test logs through t.Log
* resolving merge confilvts
* Update testing.go
* Update helper_test.go
* Added godocs for NewTestingLogger
* Added go docs for NewTestingLogger
* Resolving conflicts
* fix webconn close semantics
Avoid race conditions in WebConn on shutdown by closing channels to guarantee all readers are notified. Wrap this with sync.Once to avoid closing the channel more than once.
* web_hub_test.go
* webhub: fix race condition on shutdown
Ensure that if the webhub shuts down in the process of sending, the caller unblocks given that the webhub will no longer consume incoming events.
* panic if app shutdown takes >30 seconds
* simplify WebConn::Pump channel semantics too
