Initial seed code for distributed KV store

This patch includes the initial seed code for KV store.

Subsequent patches will include documentation, API ref and
unit tests.

Change-Id: I6296215b6b796400947ba925a2d8c46380e16992
Issue-ID: MUSIC-23
Signed-off-by: Shashank Kumar Shankar <shashank.kumar.shankar@intel.com>

1 files changed, 113 insertions, 0 deletions

diff --git a/api/consulConnection.go b/api/consulConnection.go
new file mode 100644
index 0000000..b8074e2
--- /dev/null
+++ b/api/consulConnection.go
@@ -0,0 +1,113 @@
+/*
+ * 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 api
+
+import (
+	"errors"
+	"fmt"
+	"github.com/hashicorp/consul/api"
+	"os"
+)
+
+func (kvStruct *KeyValue) WriteKVsToConsul() error {
+	for key, value := range kvStruct.kv {
+		if os.Getenv("CONSUL_IP") == "" {
+			return errors.New("CONSUL_IP environment variable not set.")
+		}
+		err := requestPUT(os.Getenv("CONSUL_IP"), key, value)
+		if err != nil {
+			return err
+		}
+		fmt.Println("key:", key, "value", value)
+	}
+	fmt.Println("Wrote KVs to Consul")
+	return nil
+}
+
+func GetKVFromConsul(key string) (string, error) {
+	if os.Getenv("CONSUL_IP") == "" {
+		return "", errors.New("CONSUL_IP environment variable not set.")
+	}
+	resp, err := requestGET(os.Getenv("CONSUL_IP"), key)
+	return resp, err
+}
+
+func GetKVsFromConsul() ([]string, error) {
+	if os.Getenv("CONSUL_IP") == "" {
+		return []string{""}, errors.New("CONSUL_IP environment variable not set.")
+	}
+	resp, err := requestGETS(os.Getenv("CONSUL_IP"))
+	return resp, err
+}
+
+func requestPUT(url string, key string, value string) error {
+	config := api.DefaultConfig()
+	config.Address = url + ":8500"
+	client, err := api.NewClient(config)
+
+	if err != nil {
+		return err
+	}
+
+	kv := client.KV()
+
+	p := &api.KVPair{Key: key, Value: []byte(value)}
+	_, err = kv.Put(p, nil)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func requestGET(url string, key string) (string, error) {
+	config := api.DefaultConfig()
+	config.Address = url + ":8500"
+	client, err := api.NewClient(config)
+
+	kv := client.KV()
+
+	pair, _, err := kv.Get(key, nil)
+
+	if pair == nil {
+		return string("No value found for key."), err
+	}
+	return string(pair.Value), err
+
+}
+
+func requestGETS(url string) ([]string, error) {
+	config := api.DefaultConfig()
+	config.Address = url + ":8500"
+	client, err := api.NewClient(config)
+
+	kv := client.KV()
+
+	pairs, _, err := kv.List("", nil)
+
+	if len(pairs) == 0 {
+		return []string{"No keys found."}, err
+	}
+
+	var res []string
+
+	for _, keypair := range pairs {
+		res = append(res, keypair.Key)
+	}
+
+	return res, err
+}