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/*
* Copyright 2018 Intel Corporation, 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 rb
import (
"bytes"
"encoding/base64"
"k8splugin/internal/db"
"log"
uuid "github.com/hashicorp/go-uuid"
pkgerrors "github.com/pkg/errors"
)
// Definition contains the parameters needed for resource bundle (rb) definitions
// It implements the interface for managing the definitions
type Definition struct {
UUID string `json:"uuid,omitempty"`
Name string `json:"name"`
ChartName string `json:"chart-name"`
Description string `json:"description"`
ServiceType string `json:"service-type"`
}
// DefinitionManager is an interface exposes the resource bundle definition functionality
type DefinitionManager interface {
Create(def Definition) (Definition, error)
List() ([]Definition, error)
Get(resID string) (Definition, error)
Delete(resID string) error
Upload(resID string, inp []byte) error
}
// DefinitionClient implements the DefinitionManager
// It will also be used to maintain some localized state
type DefinitionClient struct {
storeName string
tagMeta, tagContent string
}
// NewDefinitionClient returns an instance of the DefinitionClient
// which implements the DefinitionManager
// Uses rbdef collection in underlying db
func NewDefinitionClient() *DefinitionClient {
return &DefinitionClient{
storeName: "rbdef",
tagMeta: "metadata",
tagContent: "content",
}
}
// Create an entry for the resource in the database
func (v *DefinitionClient) Create(def Definition) (Definition, error) {
// If UUID is empty, we will generate one
if def.UUID == "" {
def.UUID, _ = uuid.GenerateUUID()
}
key := def.UUID
err := db.DBconn.Create(v.storeName, key, v.tagMeta, def)
if err != nil {
return Definition{}, pkgerrors.Wrap(err, "Creating DB Entry")
}
return def, nil
}
// List all resource entries in the database
func (v *DefinitionClient) List() ([]Definition, error) {
res, err := db.DBconn.ReadAll(v.storeName, v.tagMeta)
if err != nil || len(res) == 0 {
return []Definition{}, pkgerrors.Wrap(err, "Listing Resource Bundle Definitions")
}
var results []Definition
for key, value := range res {
//value is a byte array
if len(value) > 0 {
def := Definition{}
err = db.DBconn.Unmarshal(value, &def)
if err != nil {
log.Printf("[Definition] Error Unmarshaling value for: %s", key)
continue
}
results = append(results, def)
}
}
return results, nil
}
// Get returns the Resource Bundle Definition for corresponding ID
func (v *DefinitionClient) Get(id string) (Definition, error) {
value, err := db.DBconn.Read(v.storeName, id, v.tagMeta)
if err != nil {
return Definition{}, pkgerrors.Wrap(err, "Get Resource Bundle definition")
}
//value is a byte array
if value != nil {
def := Definition{}
err = db.DBconn.Unmarshal(value, &def)
if err != nil {
return Definition{}, pkgerrors.Wrap(err, "Unmarshaling Value")
}
return def, nil
}
return Definition{}, pkgerrors.New("Error getting Resource Bundle Definition")
}
// Delete the Resource Bundle definition from database
func (v *DefinitionClient) Delete(id string) error {
err := db.DBconn.Delete(v.storeName, id, v.tagMeta)
if err != nil {
return pkgerrors.Wrap(err, "Delete Resource Bundle Definition")
}
//Delete the content when the delete operation happens
err = db.DBconn.Delete(v.storeName, id, v.tagContent)
if err != nil {
return pkgerrors.Wrap(err, "Delete Resource Bundle Definition Content")
}
return nil
}
// Upload the contents of resource bundle into database
func (v *DefinitionClient) Upload(id string, inp []byte) error {
//ignore the returned data here
_, err := v.Get(id)
if err != nil {
return pkgerrors.Errorf("Invalid Definition ID provided: %s", err.Error())
}
err = isTarGz(bytes.NewBuffer(inp))
if err != nil {
return pkgerrors.Errorf("Error in file format: %s", err.Error())
}
//Encode given byte stream to text for storage
encodedStr := base64.StdEncoding.EncodeToString(inp)
err = db.DBconn.Create(v.storeName, id, v.tagContent, encodedStr)
if err != nil {
return pkgerrors.Errorf("Error uploading data to db: %s", err.Error())
}
return nil
}
// Download the contents of the resource bundle definition from DB
// Returns a byte array of the contents which is used by the
// ExtractTarBall code to create the folder structure on disk
func (v *DefinitionClient) Download(id string) ([]byte, error) {
//ignore the returned data here
//Check if id is valid
_, err := v.Get(id)
if err != nil {
return nil, pkgerrors.Errorf("Invalid Definition ID provided: %s", err.Error())
}
value, err := db.DBconn.Read(v.storeName, id, v.tagContent)
if err != nil {
return nil, pkgerrors.Wrap(err, "Get Resource Bundle definition content")
}
if value != nil {
//Decode the string from base64
out, err := base64.StdEncoding.DecodeString(string(value))
if err != nil {
return nil, pkgerrors.Wrap(err, "Decode base64 string")
}
if out != nil && len(out) != 0 {
return out, nil
}
}
return nil, pkgerrors.New("Error downloading Definition content")
}
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