Commit Graph

11 Commits (a6e19f2881c758eae518ce94e6e0b905ab8ccee0)

Author SHA1 Message Date
David Anderson 346a35f612 util/eventbus: add debugger methods to list pub/sub types
This lets debug tools list the types that clients are wielding, so
that they can build a dataflow graph and other debugging views.

Updates #15160

Signed-off-by: David Anderson <dave@tailscale.com>
9 months ago
David Anderson e71e95b841 util/eventbus: don't allow publishers to skip events while debugging
If any debugging hook might see an event, Publisher.ShouldPublish should
tell its caller to publish even if there are no ordinary subscribers.

Updates #15160

Signed-off-by: David Anderson <dave@tailscale.com>
9 months ago
David Anderson 853abf8661 util/eventbus: initial debugging facilities for the event bus
Enables monitoring events as they flow, listing bus clients, and
snapshotting internal queues to troubleshoot stalls.

Updates #15160

Signed-off-by: David Anderson <dave@tailscale.com>
9 months ago
David Anderson e80d2b4ad1 util/eventbus: add debug hooks to snoop on bus traffic
Updates #15160

Signed-off-by: David Anderson <dave@tailscale.com>
9 months ago
David Anderson dd7166cb8e util/eventbus: add internal hook type for debugging
Publicly exposed debugging functions will use these hooks to
observe dataflow in the bus.

Updates #15160

Signed-off-by: David Anderson <dave@tailscale.com>
9 months ago
David Anderson cf5c788cf1 util/eventbus: track additional event context in subscribe queue
Updates #15160

Signed-off-by: David Anderson <dave@tailscale.com>
9 months ago
David Anderson a1192dd686 util/eventbus: track additional event context in publish queue
Updates #15160

Signed-off-by: David Anderson <dave@tailscale.com>
9 months ago
David Anderson bf40bc4fa0 util/eventbus: make internal queue a generic type
In preparation for making the queues carry additional event metadata.

Updates #15160

Signed-off-by: David Anderson <dave@tailscale.com>
9 months ago
David Anderson 24d4846f00 util/eventbus: adjust worker goroutine management helpers
This makes the helpers closer in behavior to cancelable contexts
and taskgroup.Single, and makes the worker code use a more normal
and easier to reason about context.Context for shutdown.

Updates #15160

Signed-off-by: David Anderson <dave@tailscale.com>
9 months ago
David Anderson 3e18434595 util/eventbus: rework to have a Client abstraction
The Client carries both publishers and subscribers for a single
actor. This makes the APIs for publish and subscribe look more
similar, and this structure is a better fit for upcoming debug
facilities.

Updates #15160

Signed-off-by: David Anderson <dave@tailscale.com>
9 months ago
David Anderson ef906763ee util/eventbus: initial implementation of an in-process event bus
Updates #15160

Signed-off-by: David Anderson <dave@tailscale.com>
Co-authored-by: M. J. Fromberger <fromberger@tailscale.com>
9 months ago