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/*
Copyright 2018 Intel Corporation.
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 db
import (
"encoding/json"
"reflect"
"github.com/onap/multicloud-k8s/src/orchestrator/pkg/infra/config"
pkgerrors "github.com/pkg/errors"
)
// DBconn interface used to talk a concrete Database connection
var DBconn Store
// Key is an interface that will be implemented by anypackage
// that wants to use the Store interface. This allows various
// db backends and key types.
type Key interface {
}
// Store is an interface for accessing the database
type Store interface {
// Returns nil if db health is good
HealthCheck() error
// Unmarshal implements any unmarshaling needed for the database
Unmarshal(inp []byte, out interface{}) error
// Creates a new master document with key and links data with tag and
// creates a pointer(row) to the newly added data in the master table
Create(table string, key Key, tag string, data interface{}) error
// Reads data for a particular key with specific tag.
Read(table string, key Key, tag string) ([]byte, error)
// Update data for particular key with specific tag
Update(table string, key Key, tag string, data interface{}) error
// Deletes a specific tag data for key.
// TODO: If tag is empty, it will delete all tags under key.
Delete(table string, key Key, tag string) error
// Inserts and Updates a tag with key and also adds query fields if provided
Insert(coll string, key Key, query interface{}, tag string, data interface{}) error
// Find the document(s) with key and get the tag values from the document(s)
Find(coll string, key Key, tag string) ([][]byte, error)
// Removes the document(s) matching the key if no child reference in collection
Remove(coll string, key Key) error
// Remove all the document(s) matching the key
RemoveAll(coll string, key Key) error
}
// CreateDBClient creates the DB client
func createDBClient(dbType string, dbName string) error {
var err error
switch dbType {
case "mongo":
// create a mongodb database with orchestrator as the name
DBconn, err = NewMongoStore(dbName, nil)
default:
return pkgerrors.New(dbType + "DB not supported")
}
return err
}
// Serialize converts given data into a JSON string
func Serialize(v interface{}) (string, error) {
out, err := json.Marshal(v)
if err != nil {
return "", pkgerrors.Wrap(err, "Error serializing "+reflect.TypeOf(v).String())
}
return string(out), nil
}
// DeSerialize converts string to a json object specified by type
func DeSerialize(str string, v interface{}) error {
err := json.Unmarshal([]byte(str), &v)
if err != nil {
return pkgerrors.Wrap(err, "Error deSerializing "+str)
}
return nil
}
// InitializeDatabaseConnection sets up the connection to the
// configured database to allow the application to talk to it.
func InitializeDatabaseConnection(dbName string) error {
err := createDBClient(config.GetConfiguration().DatabaseType, dbName)
if err != nil {
return pkgerrors.Cause(err)
}
err = DBconn.HealthCheck()
if err != nil {
return pkgerrors.Cause(err)
}
return nil
}
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