/
backend.go
108 lines (87 loc) · 2.51 KB
/
backend.go
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// Copyright © 2018 Atlas Kerr atlaskerr@gmail.com
//
// 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 inmem
import (
"encoding/json"
"strings"
"github.com/atlaskerr/stori/schema/storage/backend"
"github.com/atlaskerr/stori/stori"
"github.com/tidwall/buntdb"
)
// Backend implements stori.Backend.
type Backend struct {
schema []byte
db *buntdb.DB
}
// New returns an new in-memory backend.
func New() (*Backend, error) {
b := new(Backend)
// Load jsonschema
source := backend.InmemConfigLoaderFunc()
rawJSON, err := json.Marshal(source.JsonSource())
if err != nil {
return nil, err
}
b.schema = rawJSON
// initialize the database
memDB, err := buntdb.Open(":memory:")
if err != nil {
return nil, err
}
b.db = memDB
return b, nil
}
// GetSchema retrieves a valid jsonschema in bytes from the backend. Used to
// validate the config files.
func (b *Backend) GetSchema() []byte {
return b.schema
}
func (b *Backend) setupIndexes() {
b.db.CreateIndex("namespaces", "namespace:*")
}
// Setup passes validated configuration data to the backend for
// initialization.
func (b *Backend) Setup(interface{}) error {
b.setupIndexes()
return nil
}
func set(tx *buntdb.Tx, key, value string) {
tx.Set(key, value, nil)
}
// CreateNamespace creates a new namespace in the registry.
func (b *Backend) CreateNamespace(
conf stori.NamespaceConfig) error {
keySlice := []string{"namespace", conf.Name}
fields := make(map[string]string)
fields["blob-storage-limit"] = string(conf.BlobStorageLimit)
fields["repository-limit"] = string(conf.RepositoryLimit)
fields["status"] = string(stori.NamespaceActive)
for k, v := range conf.Labels {
keySlice := []string{"label", k}
labelKey := strings.Join(keySlice, ":")
fields[labelKey] = v
}
updateFunc := func(tx *buntdb.Tx) error {
for k, v := range fields {
s := make([]string, len(keySlice))
copy(s, keySlice)
s = append(s, k)
absoluteKey := strings.Join(s, ":")
set(tx, absoluteKey, v)
}
return nil
}
b.db.Update(updateFunc)
return nil
}