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/*
* Copyright 2020 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 contextdb
import (
"context"
"encoding/json"
pkgerrors "github.com/pkg/errors"
"go.etcd.io/etcd/clientv3"
"go.etcd.io/etcd/pkg/transport"
"time"
)
// EtcdConfig Configuration values needed for Etcd Client
type EtcdConfig struct {
Endpoint string
CertFile string
KeyFile string
CAFile string
}
// EtcdClient for Etcd
type EtcdClient struct {
cli *clientv3.Client
endpoint string
}
// Etcd For Mocking purposes
type Etcd interface {
Put(ctx context.Context, key, val string, opts ...clientv3.OpOption) (*clientv3.PutResponse, error)
Get(ctx context.Context, key string, opts ...clientv3.OpOption) (*clientv3.GetResponse, error)
Delete(ctx context.Context, key string, opts ...clientv3.OpOption) (*clientv3.DeleteResponse, error)
}
var getEtcd = func(e *EtcdClient) Etcd {
return e.cli
}
// NewEtcdClient function initializes Etcd client
func NewEtcdClient(store *clientv3.Client, c EtcdConfig) (ContextDb, error) {
var endpoint string
if store == nil {
tlsInfo := transport.TLSInfo{
CertFile: c.CertFile,
KeyFile: c.KeyFile,
CAFile: c.CAFile,
}
tlsConfig, err := tlsInfo.ClientConfig()
if err != nil {
return nil, 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 = ""
if tlsConfig == nil {
endpoint = "http://" + c.Endpoint + ":2379"
} else {
endpoint = "https://" + c.Endpoint + ":2379"
}
store, err = clientv3.New(clientv3.Config{
Endpoints: []string{endpoint},
DialTimeout: 5 * time.Second,
TLS: tlsConfig,
})
if err != nil {
return nil, pkgerrors.Errorf("Error creating etcd client: %s", err.Error())
}
}
return &EtcdClient{
cli: store,
endpoint: endpoint,
}, nil
}
// Put values in Etcd DB
func (e *EtcdClient) Put(key string, value interface{}) error {
cli := getEtcd(e)
if cli == nil {
return pkgerrors.Errorf("Etcd Client not initialized")
}
if key == "" {
return pkgerrors.Errorf("Key is null")
}
if value == nil {
return pkgerrors.Errorf("Value is nil")
}
v, err := json.Marshal(value)
if err != nil {
return pkgerrors.Errorf("Json Marshal error: %s", err.Error())
}
_, err = cli.Put(context.Background(), key, string(v))
if err != nil {
return pkgerrors.Errorf("Error creating etcd entry: %s", err.Error())
}
return nil
}
// Get values from Etcd DB and decodes from json
func (e *EtcdClient) Get(key string, value interface{}) error {
cli := getEtcd(e)
if cli == nil {
return pkgerrors.Errorf("Etcd Client not initialized")
}
if key == "" {
return pkgerrors.Errorf("Key is null")
}
if value == nil {
return pkgerrors.Errorf("Value is nil")
}
getResp, err := cli.Get(context.Background(), key)
if err != nil {
return pkgerrors.Errorf("Error getting etcd entry: %s", err.Error())
}
if getResp.Count == 0 {
return pkgerrors.Errorf("Key doesn't exist")
}
return json.Unmarshal(getResp.Kvs[0].Value, value)
}
// GetAllKeys values from Etcd DB
func (e *EtcdClient) GetAllKeys(key string) ([]string, error) {
cli := getEtcd(e)
if cli == nil {
return nil, pkgerrors.Errorf("Etcd Client not initialized")
}
getResp, err := cli.Get(context.Background(), key, clientv3.WithPrefix())
if err != nil {
return nil, pkgerrors.Errorf("Error getting etcd entry: %s", err.Error())
}
if getResp.Count == 0 {
return nil, pkgerrors.Errorf("Key doesn't exist")
}
var keys []string
for _, ev := range getResp.Kvs {
keys = append(keys, string(ev.Key))
}
return keys, nil
}
// Delete values from Etcd DB
func (e *EtcdClient) Delete(key string) error {
cli := getEtcd(e)
if cli == nil {
return pkgerrors.Errorf("Etcd Client not initialized")
}
_, err := cli.Delete(context.Background(), key, clientv3.WithPrefix())
if err != nil {
return pkgerrors.Errorf("Delete failed etcd entry: %s", err.Error())
}
return nil
}
// HealthCheck for checking health of the etcd cluster
func (e *EtcdClient) HealthCheck() error {
return nil
}
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