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management_cluster_capabilities.go
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management_cluster_capabilities.go
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package capabilities
import (
"sync"
configv1 "github.com/openshift/api/config/v1"
routev1 "github.com/openshift/api/route/v1"
securityv1 "github.com/openshift/api/security/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/discovery"
)
type CapabiltyChecker interface {
Has(capabilities ...CapabilityType) bool
}
type CapabilityType int
const (
// CapabilityRoute indicates if the management cluster supports routes
CapabilityRoute CapabilityType = iota
// CapabilitySecurityContextConstraint indicates if the management cluster
// supports security context constraints
CapabilitySecurityContextConstraint
// CapabilityInfrastructure indicates if the cluster supports the
// infrastructures.config.openshift.io api
CapabilityInfrastructure
// CapabilityIngress indicates if the cluster supports the
// ingresses.config.openshift.io api
CapabilityIngress
// CapabilityProxy indicates if the cluster supports the
// proxies.config.openshift.io api
CapabilityProxy
// CapabilityDNS indicates if the cluster supports the
// dnses.config.openshift.io api
CapabilityDNS
// CapabilityNetworks indicates if the cluster supports the
// networks.config.openshift.io api
CapabilityNetworks
)
// ManagementClusterCapabilities holds all information about optional capabilities of
// the management cluster.
type ManagementClusterCapabilities struct {
capabilities map[CapabilityType]struct{}
lock sync.RWMutex
}
func (m *ManagementClusterCapabilities) Has(capabilities ...CapabilityType) bool {
m.lock.RLock()
defer m.lock.RUnlock()
// clearly define the behaviour if no capabilities are passed in
if len(capabilities) == 0 {
return false
}
for _, cap := range capabilities {
if _, exists := m.capabilities[cap]; !exists {
return false
}
}
return true
}
// isAPIResourceRegistered determines if a specified API resource is registered on the cluster
func isAPIResourceRegistered(client discovery.ServerResourcesInterface, groupVersion schema.GroupVersion, resourceName string) (bool, error) {
apis, err := client.ServerResourcesForGroupVersion(groupVersion.String())
if err != nil && !errors.IsNotFound(err) {
return false, err
}
if apis != nil {
for _, api := range apis.APIResources {
if api.Name == resourceName || api.SingularName == resourceName {
return true, nil
}
}
}
return false, nil
}
func DetectManagementClusterCapabilities(client discovery.ServerResourcesInterface) (*ManagementClusterCapabilities, error) {
discoveredCapabilities := map[CapabilityType]struct{}{}
// check for route capability
hasRouteCap, err := isAPIResourceRegistered(client, routev1.GroupVersion, "routes")
if err != nil {
return nil, err
}
if hasRouteCap {
discoveredCapabilities[CapabilityRoute] = struct{}{}
}
// check for scc capability
hasSccCap, err := isAPIResourceRegistered(client, securityv1.GroupVersion, "securitycontextconstraints")
if err != nil {
return nil, err
}
if hasSccCap {
discoveredCapabilities[CapabilitySecurityContextConstraint] = struct{}{}
}
// check for infrastructure capability
hasInfraCap, err := isAPIResourceRegistered(client, configv1.GroupVersion, "infrastructures")
if err != nil {
return nil, err
}
if hasInfraCap {
discoveredCapabilities[CapabilityInfrastructure] = struct{}{}
}
// check for ingress capability
hasIngressCap, err := isAPIResourceRegistered(client, configv1.GroupVersion, "ingresses")
if err != nil {
return nil, err
}
if hasIngressCap {
discoveredCapabilities[CapabilityIngress] = struct{}{}
}
// check for proxy capability
hasProxyCap, err := isAPIResourceRegistered(client, configv1.GroupVersion, "proxies")
if err != nil {
return nil, err
}
if hasProxyCap {
discoveredCapabilities[CapabilityProxy] = struct{}{}
}
// check for dns capability
hasDNSCap, err := isAPIResourceRegistered(client, configv1.GroupVersion, "dnses")
if err != nil {
return nil, err
}
if hasDNSCap {
discoveredCapabilities[CapabilityDNS] = struct{}{}
}
// check for networks capability
hasNetworksCap, err := isAPIResourceRegistered(client, configv1.GroupVersion, "networks")
if err != nil {
return nil, err
}
if hasNetworksCap {
discoveredCapabilities[CapabilityNetworks] = struct{}{}
}
return &ManagementClusterCapabilities{capabilities: discoveredCapabilities}, nil
}