mirror of
https://github.com/ceph/ceph-csi.git
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118 lines
4.0 KiB
Go
118 lines
4.0 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package options
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import (
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"fmt"
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"strings"
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"github.com/spf13/pflag"
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"k8s.io/apiserver/pkg/server"
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"k8s.io/apiserver/pkg/server/resourceconfig"
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serverstore "k8s.io/apiserver/pkg/server/storage"
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cliflag "k8s.io/component-base/cli/flag"
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)
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// APIEnablementOptions contains the options for which resources to turn on and off.
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// Given small aggregated API servers, this option isn't required for "normal" API servers
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type APIEnablementOptions struct {
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RuntimeConfig cliflag.ConfigurationMap
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}
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func NewAPIEnablementOptions() *APIEnablementOptions {
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return &APIEnablementOptions{
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RuntimeConfig: make(cliflag.ConfigurationMap),
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}
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}
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// AddFlags adds flags for a specific APIServer to the specified FlagSet
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func (s *APIEnablementOptions) AddFlags(fs *pflag.FlagSet) {
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if s == nil {
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return
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}
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fs.Var(&s.RuntimeConfig, "runtime-config", ""+
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"A set of key=value pairs that enable or disable built-in APIs. Supported options are:\n"+
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"v1=true|false for the core API group\n"+
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"<group>/<version>=true|false for a specific API group and version (e.g. apps/v1=true)\n"+
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"api/all=true|false controls all API versions\n"+
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"api/ga=true|false controls all API versions of the form v[0-9]+\n"+
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"api/beta=true|false controls all API versions of the form v[0-9]+beta[0-9]+\n"+
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"api/alpha=true|false controls all API versions of the form v[0-9]+alpha[0-9]+\n"+
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"api/legacy is deprecated, and will be removed in a future version")
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}
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// Validate validates RuntimeConfig with a list of registries.
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// Usually this list only has one element, the apiserver registry of the process.
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// But in the advanced (and usually not recommended) case of delegated apiservers there can be more.
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// Validate will filter out the known groups of each registry.
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// If anything is left over after that, an error is returned.
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func (s *APIEnablementOptions) Validate(registries ...GroupRegistry) []error {
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if s == nil {
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return nil
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}
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errors := []error{}
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if s.RuntimeConfig[resourceconfig.APIAll] == "false" && len(s.RuntimeConfig) == 1 {
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// Do not allow only set api/all=false, in such case apiserver startup has no meaning.
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return append(errors, fmt.Errorf("invalid key with only %v=false", resourceconfig.APIAll))
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}
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groups, err := resourceconfig.ParseGroups(s.RuntimeConfig)
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if err != nil {
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return append(errors, err)
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}
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for _, registry := range registries {
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// filter out known groups
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groups = unknownGroups(groups, registry)
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}
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if len(groups) != 0 {
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errors = append(errors, fmt.Errorf("unknown api groups %s", strings.Join(groups, ",")))
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}
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return errors
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}
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// ApplyTo override MergedResourceConfig with defaults and registry
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func (s *APIEnablementOptions) ApplyTo(c *server.Config, defaultResourceConfig *serverstore.ResourceConfig, registry resourceconfig.GroupVersionRegistry) error {
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if s == nil {
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return nil
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}
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mergedResourceConfig, err := resourceconfig.MergeAPIResourceConfigs(defaultResourceConfig, s.RuntimeConfig, registry)
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c.MergedResourceConfig = mergedResourceConfig
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return err
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}
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func unknownGroups(groups []string, registry GroupRegistry) []string {
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unknownGroups := []string{}
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for _, group := range groups {
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if !registry.IsGroupRegistered(group) {
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unknownGroups = append(unknownGroups, group)
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}
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}
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return unknownGroups
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}
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// GroupRegistry provides a method to check whether given group is registered.
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type GroupRegistry interface {
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// IsRegistered returns true if given group is registered.
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IsGroupRegistered(group string) bool
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}
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