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infrastructure.go
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infrastructure.go
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//
// Copyright (c) 2019-2021 Red Hat, Inc.
// 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 infrastructure
import (
"errors"
"fmt"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/discovery"
"sigs.k8s.io/controller-runtime/pkg/client/config"
)
// Type specifies what kind of infrastructure we're operating in.
type Type int
const (
// Unsupported represents an Unsupported cluster version (e.g. OpenShift v3)
Unsupported Type = iota
Kubernetes
OpenShiftv4
)
var (
// current is the infrastructure that we're currently running on.
current Type
initialized = false
UnsupportedClusterError = errors.New("running on unsupported cluster")
)
// Initialize attempts to determine the type of cluster its currently running on (OpenShift or Kubernetes). This function
// *must* be called before others; otherwise the call will panic.
func Initialize() error {
var err error
current, err = detect()
if err != nil {
return err
}
if current == Unsupported {
return UnsupportedClusterError
}
initialized = true
return nil
}
// InitializeForTesting is used to mock running on a specific type of cluster (Kubernetes, OpenShift) in testing code.
func InitializeForTesting(currentInfrastructure Type) {
current = currentInfrastructure
initialized = true
}
// IsOpenShift returns true if the current cluster is an OpenShift (v4.x) cluster.
func IsOpenShift() bool {
if !initialized {
panic("Attempting to determine information about the cluster without initializing first")
}
return current == OpenShiftv4
}
func detect() (Type, error) {
kubeCfg, err := config.GetConfig()
if err != nil {
return Unsupported, fmt.Errorf("could not get kube config: %w", err)
}
discoveryClient, err := discovery.NewDiscoveryClientForConfig(kubeCfg)
if err != nil {
return Unsupported, fmt.Errorf("could not get discovery client: %w", err)
}
apiList, err := discoveryClient.ServerGroups()
if err != nil {
return Unsupported, fmt.Errorf("could not read API groups: %w", err)
}
if findAPIGroup(apiList.Groups, "route.openshift.io") == nil {
return Kubernetes, nil
} else {
if findAPIGroup(apiList.Groups, "config.openshift.io") == nil {
return Unsupported, nil
} else {
return OpenShiftv4, nil
}
}
}
func findAPIGroup(source []metav1.APIGroup, apiName string) *metav1.APIGroup {
for i := 0; i < len(source); i++ {
if source[i].Name == apiName {
return &source[i]
}
}
return nil
}