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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 db
import (
"context"
"time"
pkgerrors "github.com/pkg/errors"
"go.etcd.io/etcd/clientv3"
"go.etcd.io/etcd/pkg/transport"
)
// EtcdConfig Configuration values needed for Etcd Client
type EtcdConfig struct {
Endpoint string
CertFile string
KeyFile string
CAFile string
}
// EtcdStore Interface needed for mocking
type EtcdStore interface {
Get(key string) ([]byte, error)
Put(key, value string) error
Delete(key string) error
}
// EtcdClient for Etcd
type EtcdClient struct {
cli *clientv3.Client
}
// Etcd handle for interface
var Etcd EtcdStore
// NewEtcdClient function initializes Etcd client
func NewEtcdClient(store *clientv3.Client, c EtcdConfig) error {
var err error
Etcd, err = newClient(store, c)
return err
}
func newClient(store *clientv3.Client, c EtcdConfig) (EtcdClient, error) {
if store == nil {
tlsInfo := transport.TLSInfo{
CertFile: c.CertFile,
KeyFile: c.KeyFile,
CAFile: c.CAFile,
}
tlsConfig, err := tlsInfo.ClientConfig()
if err != nil {
return EtcdClient{}, pkgerrors.Errorf("Error creating etcd TLSInfo: %s", err.Error())
}
// NOTE: Client relies on nil tlsConfig
// for non-secure connections, update the implicit variable
if len(c.CertFile) == 0 && len(c.KeyFile) == 0 && len(c.CAFile) == 0 {
tlsConfig = nil
}
endpoint := "https://" + c.Endpoint + ":2379"
store, err = clientv3.New(clientv3.Config{
Endpoints: []string{endpoint},
DialTimeout: 5 * time.Second,
TLS: tlsConfig,
})
if err != nil {
return EtcdClient{}, pkgerrors.Errorf("Error creating etcd client: %s", err.Error())
}
}
return EtcdClient{
cli: store,
}, nil
}
// Put values in Etcd DB
func (e EtcdClient) Put(key, value string) error {
if e.cli == nil {
return pkgerrors.Errorf("Etcd Client not initialized")
}
_, err := e.cli.Put(context.Background(), key, value)
if err != nil {
return pkgerrors.Errorf("Error creating etcd entry: %s", err.Error())
}
return nil
}
// Get values from Etcd DB
func (e EtcdClient) Get(key string) ([]byte, error) {
if e.cli == nil {
return nil, pkgerrors.Errorf("Etcd Client not initialized")
}
getResp, err := e.cli.Get(context.Background(), key)
if err != nil {
return nil, pkgerrors.Errorf("Error getitng etcd entry: %s", err.Error())
}
if getResp.Count == 0 {
return nil, pkgerrors.Errorf("Key doesn't exist")
}
return getResp.Kvs[0].Value, nil
}
// Delete values from Etcd DB
func (e EtcdClient) Delete(key string) error {
if e.cli == nil {
return pkgerrors.Errorf("Etcd Client not initialized")
}
_, err := e.cli.Delete(context.Background(), key)
if err != nil {
return pkgerrors.Errorf("Delete failed etcd entry:%s", err.Error())
}
return nil
}
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