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registry.go
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registry.go
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/*
* Copyright 2018 The Service Manager 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 storage
import (
"context"
"fmt"
"sync"
"github.com/Peripli/service-manager/pkg/log"
)
var (
mux sync.RWMutex
storages = make(map[string]Storage)
)
// Register adds a storage with the given name
func Register(name string, storage Storage) {
mux.RLock()
defer mux.RUnlock()
logger := log.D()
if storage == nil {
logger.Panicln("storage: Register storage is nil")
}
if _, dup := storages[name]; dup {
logger.Panicf("storage: Register called twice for storage with name %s", name)
}
storages[name] = storage
}
// HasStorage check whether storage with the given name is registered
func HasStorage(name string) bool {
mux.RLock()
defer mux.RUnlock()
_, found := storages[name]
return found
}
// Use specifies the storage for the given name
// Returns the storage ready to be used and an error if one occurred during initialization
// Upon context.Done signal the storage will be closed
func Use(ctx context.Context, name string, options *Settings) (Storage, error) {
mux.Lock()
defer mux.Unlock()
storage, exists := storages[name]
if !exists {
return nil, fmt.Errorf("error locating storage with name %s", name)
}
if err := storage.Open(options); err != nil {
return nil, fmt.Errorf("error opening storage: %s", err)
}
storages[name] = storage
go awaitTermination(ctx, storage)
return storage, nil
}
func awaitTermination(ctx context.Context, storage Storage) {
<-ctx.Done()
logger := log.C(ctx)
logger.Debug("Context cancelled. Closing storage...")
if err := storage.Close(); err != nil {
logger.Error(err)
}
}