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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 connection
import (
"encoding/base64"
"encoding/json"
"io/ioutil"
"path/filepath"
"k8splugin/internal/db"
pkgerrors "github.com/pkg/errors"
)
// Connection contains the parameters needed for Connection information for a Cloud region
type Connection struct {
CloudRegion string `json:"cloud-region"`
CloudOwner string `json:"cloud-owner"`
Kubeconfig string `json:"kubeconfig"`
OtherConnectivityList map[string]interface{} `json:"other-connectivity-list"`
}
// ConnectionKey is the key structure that is used in the database
type ConnectionKey struct {
CloudRegion string `json:"cloud-region"`
}
// We will use json marshalling to convert to string to
// preserve the underlying structure.
func (dk ConnectionKey) String() string {
out, err := json.Marshal(dk)
if err != nil {
return ""
}
return string(out)
}
// ConnectionManager is an interface exposes the Connection functionality
type ConnectionManager interface {
Create(c Connection) (Connection, error)
Get(name string) (Connection, error)
Delete(name string) error
}
// ConnectionClient implements the ConnectionManager
// It will also be used to maintain some localized state
type ConnectionClient struct {
storeName string
tagMeta string
}
// New ConnectionClient returns an instance of the ConnectionClient
// which implements the ConnectionManager
func NewConnectionClient() *ConnectionClient {
return &ConnectionClient{
storeName: "connection",
tagMeta: "metadata",
}
}
// Create an entry for the Connection resource in the database`
func (v *ConnectionClient) Create(c Connection) (Connection, error) {
//Construct composite key consisting of name
key := ConnectionKey{CloudRegion: c.CloudRegion}
//Check if this Connection already exists
_, err := v.Get(c.CloudRegion)
if err == nil {
return Connection{}, pkgerrors.New("Connection already exists")
}
err = db.DBconn.Create(v.storeName, key, v.tagMeta, c)
if err != nil {
return Connection{}, pkgerrors.Wrap(err, "Creating DB Entry")
}
return c, nil
}
// Get returns Connection for corresponding to name
func (v *ConnectionClient) Get(name string) (Connection, error) {
//Construct the composite key to select the entry
key := ConnectionKey{CloudRegion: name}
value, err := db.DBconn.Read(v.storeName, key, v.tagMeta)
if err != nil {
return Connection{}, pkgerrors.Wrap(err, "Get Connection")
}
//value is a byte array
if value != nil {
c := Connection{}
err = db.DBconn.Unmarshal(value, &c)
if err != nil {
return Connection{}, pkgerrors.Wrap(err, "Unmarshaling Value")
}
return c, nil
}
return Connection{}, pkgerrors.New("Error getting Connection")
}
// Delete the Connection from database
func (v *ConnectionClient) Delete(name string) error {
//Construct the composite key to select the entry
key := ConnectionKey{CloudRegion: name}
err := db.DBconn.Delete(v.storeName, key, v.tagMeta)
if err != nil {
return pkgerrors.Wrap(err, "Delete Connection")
}
return nil
}
// Download the connection information onto a kubeconfig file
// The file is named after the name of the connection and will
// be placed in the provided parent directory
func (v *ConnectionClient) Download(name string, parentdir string) (string, error) {
conn, err := v.Get(name)
if err != nil {
return "", pkgerrors.Wrap(err, "Getting Connection info")
}
//Decode the kubeconfig from base64 to string
kubeContent, err := base64.StdEncoding.DecodeString(conn.Kubeconfig)
if err != nil {
return "", pkgerrors.Wrap(err, "Converting from base64")
}
target := filepath.Join(parentdir, conn.CloudRegion)
err = ioutil.WriteFile(target, kubeContent, 0644)
if err != nil {
return "", pkgerrors.Wrap(err, "Writing kubeconfig to file")
}
return target, nil
}
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