mirror of https://github.com/docker/cli.git
126 lines
4.4 KiB
Go
126 lines
4.4 KiB
Go
/*
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Copyright 2016 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 discovery
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import (
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"fmt"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/util/sets"
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apimachineryversion "k8s.io/apimachinery/pkg/version"
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)
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// MatchesServerVersion queries the server to compares the build version
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// (git hash) of the client with the server's build version. It returns an error
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// if it failed to contact the server or if the versions are not an exact match.
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func MatchesServerVersion(clientVersion apimachineryversion.Info, client DiscoveryInterface) error {
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sVer, err := client.ServerVersion()
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if err != nil {
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return fmt.Errorf("couldn't read version from server: %v", err)
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}
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// GitVersion includes GitCommit and GitTreeState, but best to be safe?
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if clientVersion.GitVersion != sVer.GitVersion || clientVersion.GitCommit != sVer.GitCommit || clientVersion.GitTreeState != sVer.GitTreeState {
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return fmt.Errorf("server version (%#v) differs from client version (%#v)", sVer, clientVersion)
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}
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return nil
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}
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// ServerSupportsVersion returns an error if the server doesn't have the required version
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func ServerSupportsVersion(client DiscoveryInterface, requiredGV schema.GroupVersion) error {
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groups, err := client.ServerGroups()
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if err != nil {
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// This is almost always a connection error, and higher level code should treat this as a generic error,
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// not a negotiation specific error.
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return err
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}
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versions := metav1.ExtractGroupVersions(groups)
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serverVersions := sets.String{}
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for _, v := range versions {
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serverVersions.Insert(v)
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}
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if serverVersions.Has(requiredGV.String()) {
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return nil
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}
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// If the server supports no versions, then we should pretend it has the version because of old servers.
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// This can happen because discovery fails due to 403 Forbidden errors
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if len(serverVersions) == 0 {
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return nil
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}
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return fmt.Errorf("server does not support API version %q", requiredGV)
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}
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// GroupVersionResources converts APIResourceLists to the GroupVersionResources.
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func GroupVersionResources(rls []*metav1.APIResourceList) (map[schema.GroupVersionResource]struct{}, error) {
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gvrs := map[schema.GroupVersionResource]struct{}{}
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for _, rl := range rls {
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gv, err := schema.ParseGroupVersion(rl.GroupVersion)
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if err != nil {
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return nil, err
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}
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for i := range rl.APIResources {
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gvrs[schema.GroupVersionResource{Group: gv.Group, Version: gv.Version, Resource: rl.APIResources[i].Name}] = struct{}{}
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}
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}
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return gvrs, nil
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}
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// FilteredBy filters by the given predicate. Empty APIResourceLists are dropped.
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func FilteredBy(pred ResourcePredicate, rls []*metav1.APIResourceList) []*metav1.APIResourceList {
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result := []*metav1.APIResourceList{}
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for _, rl := range rls {
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filtered := *rl
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filtered.APIResources = nil
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for i := range rl.APIResources {
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if pred.Match(rl.GroupVersion, &rl.APIResources[i]) {
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filtered.APIResources = append(filtered.APIResources, rl.APIResources[i])
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}
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}
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if filtered.APIResources != nil {
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result = append(result, &filtered)
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}
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}
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return result
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}
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// ResourcePredicate has a method to check if a resource matches a given condition.
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type ResourcePredicate interface {
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Match(groupVersion string, r *metav1.APIResource) bool
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}
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// ResourcePredicateFunc returns true if it matches a resource based on a custom condition.
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type ResourcePredicateFunc func(groupVersion string, r *metav1.APIResource) bool
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// Match is a wrapper around ResourcePredicateFunc.
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func (fn ResourcePredicateFunc) Match(groupVersion string, r *metav1.APIResource) bool {
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return fn(groupVersion, r)
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}
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// SupportsAllVerbs is a predicate matching a resource iff all given verbs are supported.
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type SupportsAllVerbs struct {
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Verbs []string
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}
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// Match checks if a resource contains all the given verbs.
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func (p SupportsAllVerbs) Match(groupVersion string, r *metav1.APIResource) bool {
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return sets.NewString([]string(r.Verbs)...).HasAll(p.Verbs...)
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}
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