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retriever.go
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retriever.go
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package registryhostname
import (
"fmt"
"os"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
)
// RegistryHostnameRetriever represents an interface for retrieving the hostname
// of internal and external registry.
type RegistryHostnameRetriever interface {
InternalRegistryHostname() (string, bool)
ExternalRegistryHostname() (string, bool)
}
// DefaultRegistryHostnameRetriever is a default implementation of
// RegistryHostnameRetriever.
// The first argument is a function that lazy-loads the value of
// OPENSHIFT_DEFAULT_REGISTRY environment variable which should be deprecated in
// future.
func TestingRegistryHostnameRetriever(deprecatedDefaultRegistryEnvFn func() (string, bool), external, internal string) RegistryHostnameRetriever {
return &defaultRegistryHostnameRetriever{
deprecatedDefaultFn: deprecatedDefaultRegistryEnvFn,
externalHostname: external,
internalHostname: internal,
}
}
func DefaultRegistryHostnameRetriever(clientConfig *rest.Config, external, internal string) (RegistryHostnameRetriever, error) {
kubeClient, err := kubernetes.NewForConfig(clientConfig)
if err != nil {
return nil, err
}
defaultRegistry := env("OPENSHIFT_DEFAULT_REGISTRY", "${DOCKER_REGISTRY_SERVICE_HOST}:${DOCKER_REGISTRY_SERVICE_PORT}")
svcCache := newServiceResolverCache(kubeClient.CoreV1().Services(metav1.NamespaceDefault).Get)
defaultRegistryFunc, err := svcCache.Defer(defaultRegistry)
if err != nil {
return nil, fmt.Errorf("OPENSHIFT_DEFAULT_REGISTRY variable is invalid %q: %v", defaultRegistry, err)
}
return &defaultRegistryHostnameRetriever{
deprecatedDefaultFn: defaultRegistryFunc,
externalHostname: external,
internalHostname: internal,
}, nil
}
// env returns an environment variable, or the defaultValue if it is not set.
func env(key string, defaultValue string) string {
val := os.Getenv(key)
if len(val) == 0 {
return defaultValue
}
return val
}
type defaultRegistryHostnameRetriever struct {
// deprecatedDefaultFn points to a function that will lazy-load the value of
// OPENSHIFT_DEFAULT_REGISTRY.
deprecatedDefaultFn func() (string, bool)
internalHostname string
externalHostname string
}
// InternalRegistryHostnameFn returns a function that can be used to lazy-load
// the internal Docker Registry hostname. If the master configuration properly
// InternalRegistryHostname is set, it will prefer that over the lazy-loaded
// environment variable 'OPENSHIFT_DEFAULT_REGISTRY'.
func (r *defaultRegistryHostnameRetriever) InternalRegistryHostname() (string, bool) {
if len(r.internalHostname) > 0 {
return r.internalHostname, true
}
if r.deprecatedDefaultFn != nil {
return r.deprecatedDefaultFn()
}
return "", false
}
// ExternalRegistryHostnameFn returns a function that can be used to retrieve an
// external/public hostname of Docker Registry. External location can be
// configured in master config using 'ExternalRegistryHostname' property.
func (r *defaultRegistryHostnameRetriever) ExternalRegistryHostname() (string, bool) {
return r.externalHostname, len(r.externalHostname) > 0
}