feat: kubesphere 4.0 (#6115)

* feat: kubesphere 4.0

Signed-off-by: ci-bot <ci-bot@kubesphere.io>

* feat: kubesphere 4.0

Signed-off-by: ci-bot <ci-bot@kubesphere.io>

---------

Signed-off-by: ci-bot <ci-bot@kubesphere.io>
Co-authored-by: ks-ci-bot <ks-ci-bot@example.com>
Co-authored-by: joyceliu <joyceliu@yunify.com>

vendor/k8s.io/apiserver/pkg/util/flowcontrol/request/width.go

@@ -22,6 +22,9 @@ import (
 	"time"
 
 	apirequest "k8s.io/apiserver/pkg/endpoints/request"
+	"k8s.io/apiserver/pkg/features"
+	utilfeature "k8s.io/apiserver/pkg/util/feature"
+
 	"k8s.io/klog/v2"
 )
 
@@ -61,15 +64,19 @@ type objectCountGetterFunc func(string) (int64, error)
 // number of watchers potentially interested in a given request.
 type watchCountGetterFunc func(*apirequest.RequestInfo) int
 
+// MaxSeatsFunc represents a function that returns the maximum seats
+// allowed for the work estimator for a given priority level.
+type maxSeatsFunc func(priorityLevelName string) uint64
+
 // NewWorkEstimator estimates the work that will be done by a given request,
 // if no WorkEstimatorFunc matches the given request then the default
 // work estimate of 1 seat is allocated to the request.
-func NewWorkEstimator(objectCountFn objectCountGetterFunc, watchCountFn watchCountGetterFunc, config *WorkEstimatorConfig) WorkEstimatorFunc {
+func NewWorkEstimator(objectCountFn objectCountGetterFunc, watchCountFn watchCountGetterFunc, config *WorkEstimatorConfig, maxSeatsFn maxSeatsFunc) WorkEstimatorFunc {
 	estimator := &workEstimator{
 		minimumSeats:          config.MinimumSeats,
-		maximumSeats:          config.MaximumSeats,
-		listWorkEstimator:     newListWorkEstimator(objectCountFn, config),
-		mutatingWorkEstimator: newMutatingWorkEstimator(watchCountFn, config),
+		maximumSeatsLimit:     config.MaximumSeatsLimit,
+		listWorkEstimator:     newListWorkEstimator(objectCountFn, config, maxSeatsFn),
+		mutatingWorkEstimator: newMutatingWorkEstimator(watchCountFn, config, maxSeatsFn),
 	}
 	return estimator.estimate
 }
@@ -86,8 +93,8 @@ func (e WorkEstimatorFunc) EstimateWork(r *http.Request, flowSchemaName, priorit
 type workEstimator struct {
 	// the minimum number of seats a request must occupy
 	minimumSeats uint64
-	// the maximum number of seats a request can occupy
-	maximumSeats uint64
+	// the default maximum number of seats a request can occupy
+	maximumSeatsLimit uint64
 	// listWorkEstimator estimates work for list request(s)
 	listWorkEstimator WorkEstimatorFunc
 	// mutatingWorkEstimator calculates the width of mutating request(s)
@@ -99,12 +106,21 @@ func (e *workEstimator) estimate(r *http.Request, flowSchemaName, priorityLevelN
 	if !ok {
 		klog.ErrorS(fmt.Errorf("no RequestInfo found in context"), "Failed to estimate work for the request", "URI", r.RequestURI)
 		// no RequestInfo should never happen, but to be on the safe side let's return maximumSeats
-		return WorkEstimate{InitialSeats: e.maximumSeats}
+		return WorkEstimate{InitialSeats: e.maximumSeatsLimit}
 	}
 
 	switch requestInfo.Verb {
 	case "list":
 		return e.listWorkEstimator.EstimateWork(r, flowSchemaName, priorityLevelName)
+	case "watch":
+		// WATCH supports `SendInitialEvents` option, which effectively means
+		// that is starts with sending of the contents of a corresponding LIST call.
+		// From that perspective, given that the watch only consumes APF seats
+		// during its initialization (sending init events), its cost should then
+		// be computed the same way as for a regular list.
+		if utilfeature.DefaultFeatureGate.Enabled(features.WatchList) {
+			return e.listWorkEstimator.EstimateWork(r, flowSchemaName, priorityLevelName)
+		}
 	case "create", "update", "patch", "delete":
 		return e.mutatingWorkEstimator.EstimateWork(r, flowSchemaName, priorityLevelName)
 	}