Adding EndpointSlice controller

cmd/kube-controller-manager/app/options/endpointslicecontroller.go

@@ -0,0 +1,81 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package options
+
+import (
+	"fmt"
+	"github.com/spf13/pflag"
+
+	endpointsliceconfig "k8s.io/kubernetes/pkg/controller/endpointslice/config"
+)
+
+const (
+	minConcurrentServiceEndpointSyncs = 1
+	maxConcurrentServiceEndpointSyncs = 50
+	minMaxEndpointsPerSlice           = 1
+	maxMaxEndpointsPerSlice           = 1000
+)
+
+// EndpointSliceControllerOptions holds the EndpointSliceController options.
+type EndpointSliceControllerOptions struct {
+	*endpointsliceconfig.EndpointSliceControllerConfiguration
+}
+
+// AddFlags adds flags related to EndpointSliceController for controller manager to the specified FlagSet.
+func (o *EndpointSliceControllerOptions) AddFlags(fs *pflag.FlagSet) {
+	if o == nil {
+		return
+	}
+
+	fs.Int32Var(&o.ConcurrentServiceEndpointSyncs, "concurrent-service-endpoint-syncs", o.ConcurrentServiceEndpointSyncs, "The number of service endpoint syncing operations that will be done concurrently. Larger number = faster endpoint slice updating, but more CPU (and network) load. Defaults to 5.")
+	fs.Int32Var(&o.MaxEndpointsPerSlice, "max-endpoints-per-slice", o.MaxEndpointsPerSlice, "The maximum number of endpoints that will be added to an EndpointSlice. More endpoints per slice will result in less endpoint slices, but larger resources. Defaults to 100.")
+}
+
+// ApplyTo fills up EndpointSliceController config with options.
+func (o *EndpointSliceControllerOptions) ApplyTo(cfg *endpointsliceconfig.EndpointSliceControllerConfiguration) error {
+	if o == nil {
+		return nil
+	}
+
+	cfg.ConcurrentServiceEndpointSyncs = o.ConcurrentServiceEndpointSyncs
+	cfg.MaxEndpointsPerSlice = o.MaxEndpointsPerSlice
+
+	return nil
+}
+
+// Validate checks validation of EndpointSliceControllerOptions.
+func (o *EndpointSliceControllerOptions) Validate() []error {
+	if o == nil {
+		return nil
+	}
+
+	errs := []error{}
+
+	if o.ConcurrentServiceEndpointSyncs < minConcurrentServiceEndpointSyncs {
+		errs = append(errs, fmt.Errorf("concurrent-service-endpoint-syncs must not be less than %d, but got %d", minConcurrentServiceEndpointSyncs, o.ConcurrentServiceEndpointSyncs))
+	} else if o.ConcurrentServiceEndpointSyncs > maxConcurrentServiceEndpointSyncs {
+		errs = append(errs, fmt.Errorf("concurrent-service-endpoint-syncs must not be more than %d, but got %d", maxConcurrentServiceEndpointSyncs, o.ConcurrentServiceEndpointSyncs))
+	}
+
+	if o.MaxEndpointsPerSlice < minMaxEndpointsPerSlice {
+		errs = append(errs, fmt.Errorf("max-endpoints-per-slice must not be less than %d, but got %d", minMaxEndpointsPerSlice, o.MaxEndpointsPerSlice))
+	} else if o.MaxEndpointsPerSlice > maxMaxEndpointsPerSlice {
+		errs = append(errs, fmt.Errorf("max-endpoints-per-slice must not be more than %d, but got %d", maxMaxEndpointsPerSlice, o.MaxEndpointsPerSlice))
+	}
+
+	return errs
+}