110 lines
4.1 KiB
Go
110 lines
4.1 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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"k8s.io/client-go/pkg/api/unversioned"
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"k8s.io/client-go/pkg/util/sets"
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"k8s.io/client-go/pkg/version"
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// Import solely to initialize client auth plugins.
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_ "k8s.io/client-go/plugin/pkg/client/auth"
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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(client DiscoveryInterface) error {
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cVer := version.Get()
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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\n", err)
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}
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// GitVersion includes GitCommit and GitTreeState, but best to be safe?
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if cVer.GitVersion != sVer.GitVersion || cVer.GitCommit != sVer.GitCommit || cVer.GitTreeState != sVer.GitTreeState {
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return fmt.Errorf("server version (%#v) differs from client version (%#v)!\n", sVer, cVer)
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}
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return nil
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}
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// NegotiateVersion queries the server's supported api versions to find
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// a version that both client and server support.
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// - If no version is provided, try registered client versions in order of
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// preference.
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// - If version is provided and the server does not support it,
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// return an error.
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func NegotiateVersion(client DiscoveryInterface, requiredGV *unversioned.GroupVersion, clientRegisteredGVs []unversioned.GroupVersion) (*unversioned.GroupVersion, error) {
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clientVersions := sets.String{}
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for _, gv := range clientRegisteredGVs {
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clientVersions.Insert(gv.String())
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}
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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 nil, err
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}
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versions := unversioned.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 version explicitly requested verify that both client and server support it.
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// If server does not support warn, but try to negotiate a lower version.
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if requiredGV != nil {
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if !clientVersions.Has(requiredGV.String()) {
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return nil, fmt.Errorf("client does not support API version %q; client supported API versions: %v", requiredGV, clientVersions)
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}
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// If the server supports no versions, then we should just use the preferredGV
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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 requiredGV, nil
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}
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if serverVersions.Has(requiredGV.String()) {
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return requiredGV, nil
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}
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// If we are using an explicit config version the server does not support, fail.
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return nil, fmt.Errorf("server does not support API version %q", requiredGV)
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}
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for _, clientGV := range clientRegisteredGVs {
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if serverVersions.Has(clientGV.String()) {
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// Version was not explicitly requested in command config (--api-version).
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// Ok to fall back to a supported version with a warning.
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// TODO: caesarxuchao: enable the warning message when we have
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// proper fix. Please refer to issue #14895.
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// if len(version) != 0 {
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// glog.Warningf("Server does not support API version '%s'. Falling back to '%s'.", version, clientVersion)
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// }
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t := clientGV
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return &t, nil
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}
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}
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// if we have no server versions and we have no required version, choose the first clientRegisteredVersion
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if len(serverVersions) == 0 && len(clientRegisteredGVs) > 0 {
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return &clientRegisteredGVs[0], nil
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}
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return nil, fmt.Errorf("failed to negotiate an api version; server supports: %v, client supports: %v",
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serverVersions, clientVersions)
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}
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