1 files changed, 175 insertions, 0 deletions
diff --git a/src/orchestrator/pkg/infra/contextdb/etcd.go b/src/orchestrator/pkg/infra/contextdb/etcd.go
new file mode 100644
index 00000000..a1922d3b
--- /dev/null
+++ b/src/orchestrator/pkg/infra/contextdb/etcd.go
@@ -0,0 +1,175 @@
+/*
+ * 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
+}