Refactor previous COOPGO Identity service - Initial commit

storage/etcd.go

@@ -0,0 +1,120 @@
+package storage
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/spf13/viper"
+	clientv3 "go.etcd.io/etcd/client/v3"
+	"go.etcd.io/etcd/client/v3/namespace"
+)
+
+type EtcdKVStore struct {
+	Client *clientv3.Client
+}
+
+func NewEtcdKVStore(cfg *viper.Viper) (EtcdKVStore, error) {
+	var (
+		endpoints = cfg.GetStringSlice("storage.kv.etcd.endpoints")
+		prefix    = cfg.GetString("storage.kv.etcd.prefix")
+	)
+
+	cli, err := clientv3.New(clientv3.Config{
+		Endpoints:   endpoints,
+		DialTimeout: 5 * time.Second,
+	})
+	if err != nil {
+		return EtcdKVStore{}, err
+	}
+
+	cli.KV = namespace.NewKV(cli.KV, prefix)
+	cli.Watcher = namespace.NewWatcher(cli.Watcher, prefix)
+	cli.Lease = namespace.NewLease(cli.Lease, prefix)
+
+	return EtcdKVStore{
+		Client: cli,
+	}, nil
+}
+
+func (s EtcdKVStore) Put(k string, v any) error {
+	// var data bytes.Buffer // Stand-in for a network connection
+	// enc := gob.NewEncoder(&data)
+	// err := enc.Encode(v)
+	// if err != nil {
+	// 	return err
+	// }
+	data, err := json.Marshal(v)
+	if err != nil {
+		return err
+	}
+	// _, err = s.Client.KV.Put(context.TODO(), k, data.String())
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	_, err = s.Client.KV.Put(ctx, k, string(data))
+	cancel()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (s EtcdKVStore) PutWithTTL(k string, v any, duration time.Duration) error {
+	lease, err := s.Client.Lease.Grant(context.TODO(), int64(duration.Seconds()))
+	if err != nil {
+		return err
+	}
+
+	// var data bytes.Buffer // Stand-in for a network connection
+	// enc := gob.NewEncoder(&data)
+	// err = enc.Encode(v)
+	// if err != nil {
+	// 	return err
+	// }
+	data, err := json.Marshal(v)
+	if err != nil {
+		return err
+	}
+	// _, err = s.Client.KV.Put(context.TODO(), k, data.String(), clientv3.WithLease(lease.ID))
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	_, err = s.Client.KV.Put(ctx, k, string(data), clientv3.WithLease(lease.ID))
+	cancel()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (s EtcdKVStore) Get(k string) (any, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	resp, err := s.Client.KV.Get(ctx, k)
+	cancel()
+	if err != nil {
+		return nil, err
+	}
+	for _, v := range resp.Kvs {
+		var data any
+		// var reader bytes.Buffer
+		// reader.Write(v.Value)
+		// enc := gob.NewDecoder(&reader)
+		// err := enc.Decode(&data)
+		err := json.Unmarshal([]byte(v.Value), &data)
+		if err != nil {
+			return nil, err
+		}
+		// We return directly as we want to last revision of value
+		return data, nil
+	}
+	return nil, errors.New(fmt.Sprintf("no value %v", k))
+}
+
+func (s EtcdKVStore) Delete(k string) error {
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	_, err := s.Client.KV.Delete(ctx, k)
+	cancel()
+	if err != nil {
+		return err
+	}
+	return nil
+}