Documentation
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Overview ¶
Package controllerutils holds controller helpers shared across services (backend, kube-applier, ...) that all build Cosmos-backed informer-driven controllers and want consistent cadence/gating behavior.
The cooldown gate exposed here was originally backend/pkg/controllers/controllerutils' TimeBasedCooldownChecker; it lives in internal/ so kube-applier can use the same implementation without re-importing the backend module.
Index ¶
Constants ¶
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Variables ¶
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Functions ¶
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Types ¶
type CooldownChecker ¶
CooldownChecker decides whether a key may be (re-)queued.
Implementations must be safe to call concurrently — informer event handlers, periodic resyncs, and worker goroutines may all consult the same checker.
CanSync takes a context so implementations may emit logs or use context-bound services; the time-based variant ignores it. A true return is taken as "the caller WILL sync this key" and the implementation is free to record state (e.g. stamp a next-allowed time) on that basis.
type TimeBasedCooldownChecker ¶
type TimeBasedCooldownChecker struct {
// contains filtered or unexported fields
}
TimeBasedCooldownChecker is a fixed-interval cooldown gate: after CanSync returns true for a key, subsequent calls for the same key return false until cooldownDuration has elapsed since the allowed call.
The next-exec map is an LRU rather than an unbounded map so that a long-running process whose keys come and go does not leak memory. 1M entries is far above any realistic management cluster's resource count.
func NewTimeBasedCooldownChecker ¶
func NewTimeBasedCooldownChecker(cooldownDuration time.Duration) *TimeBasedCooldownChecker
NewTimeBasedCooldownChecker constructs a checker bound to the real wall-clock and a 1M-entry LRU. Tests should call SetClock to inject a fake clock.
func (*TimeBasedCooldownChecker) CanSync ¶
func (c *TimeBasedCooldownChecker) CanSync(_ context.Context, key any) bool
CanSync stamps now+cooldownDuration on a true return so subsequent calls within the cooldown window return false. A key with no record is always allowed. ctx is part of the CooldownChecker interface but unused here.
func (*TimeBasedCooldownChecker) SetClock ¶
func (c *TimeBasedCooldownChecker) SetClock(clock utilsclock.PassiveClock)
SetClock substitutes the time source used to evaluate the cooldown. Intended for tests; production code should use the real clock from the constructor.
Source Files