mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-10 16:30:19 +00:00
135 lines
3.7 KiB
Go
135 lines
3.7 KiB
Go
/*
|
|
Copyright 2014 The Kubernetes Authors.
|
|
|
|
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 cloudprovider
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"sync"
|
|
|
|
"github.com/golang/glog"
|
|
)
|
|
|
|
// Factory is a function that returns a cloudprovider.Interface.
|
|
// The config parameter provides an io.Reader handler to the factory in
|
|
// order to load specific configurations. If no configuration is provided
|
|
// the parameter is nil.
|
|
type Factory func(config io.Reader) (Interface, error)
|
|
|
|
// All registered cloud providers.
|
|
var (
|
|
providersMutex sync.Mutex
|
|
providers = make(map[string]Factory)
|
|
)
|
|
|
|
const externalCloudProvider = "external"
|
|
|
|
// RegisterCloudProvider registers a cloudprovider.Factory by name. This
|
|
// is expected to happen during app startup.
|
|
func RegisterCloudProvider(name string, cloud Factory) {
|
|
providersMutex.Lock()
|
|
defer providersMutex.Unlock()
|
|
if _, found := providers[name]; found {
|
|
glog.Fatalf("Cloud provider %q was registered twice", name)
|
|
}
|
|
glog.V(1).Infof("Registered cloud provider %q", name)
|
|
providers[name] = cloud
|
|
}
|
|
|
|
// IsCloudProvider returns true if name corresponds to an already registered
|
|
// cloud provider.
|
|
func IsCloudProvider(name string) bool {
|
|
providersMutex.Lock()
|
|
defer providersMutex.Unlock()
|
|
_, found := providers[name]
|
|
return found
|
|
}
|
|
|
|
// CloudProviders returns the name of all registered cloud providers in a
|
|
// string slice
|
|
func CloudProviders() []string {
|
|
names := []string{}
|
|
providersMutex.Lock()
|
|
defer providersMutex.Unlock()
|
|
for name := range providers {
|
|
names = append(names, name)
|
|
}
|
|
return names
|
|
}
|
|
|
|
// GetCloudProvider creates an instance of the named cloud provider, or nil if
|
|
// the name is unknown. The error return is only used if the named provider
|
|
// was known but failed to initialize. The config parameter specifies the
|
|
// io.Reader handler of the configuration file for the cloud provider, or nil
|
|
// for no configuation.
|
|
func GetCloudProvider(name string, config io.Reader) (Interface, error) {
|
|
providersMutex.Lock()
|
|
defer providersMutex.Unlock()
|
|
f, found := providers[name]
|
|
if !found {
|
|
return nil, nil
|
|
}
|
|
return f(config)
|
|
}
|
|
|
|
// Detects if the string is an external cloud provider
|
|
func IsExternal(name string) bool {
|
|
return name == externalCloudProvider
|
|
}
|
|
|
|
// InitCloudProvider creates an instance of the named cloud provider.
|
|
func InitCloudProvider(name string, configFilePath string) (Interface, error) {
|
|
var cloud Interface
|
|
var err error
|
|
|
|
if name == "" {
|
|
glog.Info("No cloud provider specified.")
|
|
return nil, nil
|
|
}
|
|
|
|
if IsExternal(name) {
|
|
glog.Info("External cloud provider specified")
|
|
return nil, nil
|
|
}
|
|
|
|
if configFilePath != "" {
|
|
var config *os.File
|
|
config, err = os.Open(configFilePath)
|
|
if err != nil {
|
|
glog.Fatalf("Couldn't open cloud provider configuration %s: %#v",
|
|
configFilePath, err)
|
|
}
|
|
|
|
defer config.Close()
|
|
cloud, err = GetCloudProvider(name, config)
|
|
} else {
|
|
// Pass explicit nil so plugins can actually check for nil. See
|
|
// "Why is my nil error value not equal to nil?" in golang.org/doc/faq.
|
|
cloud, err = GetCloudProvider(name, nil)
|
|
}
|
|
|
|
if err != nil {
|
|
return nil, fmt.Errorf("could not init cloud provider %q: %v", name, err)
|
|
}
|
|
if cloud == nil {
|
|
return nil, fmt.Errorf("unknown cloud provider %q", name)
|
|
}
|
|
|
|
return cloud, nil
|
|
}
|