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transformers.go
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transformers.go
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// Copyright 2019 Netflix, 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 transformers
import (
"net/http"
"path/filepath"
"sync"
"github.com/Netflix/p2plab"
"github.com/Netflix/p2plab/transformers/oci"
"github.com/pkg/errors"
)
type Transformers struct {
root string
client *http.Client
mu sync.Mutex
ts map[string]p2plab.Transformer
}
func New(root string, client *http.Client) *Transformers {
return &Transformers{
root: root,
client: client,
ts: make(map[string]p2plab.Transformer),
}
}
func (t *Transformers) Close() error {
for _, transformer := range t.ts {
err := transformer.Close()
if err != nil {
return err
}
}
return nil
}
func (t *Transformers) Get(objectType string) (p2plab.Transformer, error) {
t.mu.Lock()
defer t.mu.Unlock()
transformer, ok := t.ts[objectType]
if !ok {
var err error
transformer, err = t.newTransformer(objectType)
if err != nil {
return nil, err
}
t.ts[objectType] = transformer
}
return transformer, nil
}
func (t *Transformers) newTransformer(objectType string) (p2plab.Transformer, error) {
root := filepath.Join(t.root, objectType)
switch objectType {
case "oci":
return oci.New(root, t.client)
default:
return nil, errors.Errorf("unrecognized object type: %q", objectType)
}
}