cache refactoring

2023-05-19 10:06:30 +02:00 · 2023-05-19 10:06:30 +02:00 · 6299a6c7be
parent 718c39de00
commit 6299a6c7be
5 changed files with 285 additions and 186 deletions
--- a/utils/storage/badger.go
+++ b/utils/storage/badger.go
@ -0,0 +1,91 @@
+package storage
+
+import (
+	"encoding/json"
+	"github.com/dgraph-io/badger/v4"
+	"github.com/spf13/viper"
+	"time"
+)
+
+type BadgerHandler struct {
+	db *badger.DB
+}
+
+func NewBadgerHandler(cfg *viper.Viper) (*BadgerHandler, error) {
+	dbPath := cfg.GetString("storage.kv.badger.dbPath")
+
+	opts := badger.DefaultOptions(dbPath)
+	db, err := badger.Open(opts)
+	if err != nil {
+		return nil, err
+	}
+
+	return &BadgerHandler{
+		db: db,
+	}, nil
+}
+
+func (bh *BadgerHandler) Put(k string, v any) error {
+	err := bh.db.Update(func(txn *badger.Txn) error {
+		bytes, err := json.Marshal(v)
+		if err != nil {
+			return err
+		}
+		return txn.Set([]byte(k), bytes)
+	})
+
+	return err
+}
+
+func (bh *BadgerHandler) PutWithTTL(k string, v any, duration time.Duration) error {
+	err := bh.db.Update(func(txn *badger.Txn) error {
+		bytes, err := json.Marshal(v)
+		if err != nil {
+			return err
+		}
+		entry := badger.NewEntry([]byte(k), bytes).WithTTL(duration)
+		return txn.SetEntry(entry)
+	})
+
+	return err
+}
+
+func (bh *BadgerHandler) Get(k string) (any, error) {
+	var value []byte
+
+	err := bh.db.View(func(txn *badger.Txn) error {
+		item, err := txn.Get([]byte(k))
+		if err != nil {
+			return err
+		}
+
+		err = item.Value(func(val []byte) error {
+			value = make([]byte, len(val))
+			copy(value, val)
+			return nil
+		})
+
+		return err
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	var result map[string]interface{}
+	err = json.Unmarshal(value, &result)
+	if err != nil {
+		return nil, err
+	}
+
+	return result, nil
+}
+
+func (bh *BadgerHandler) Delete(k string) error {
+	err := bh.db.Update(func(txn *badger.Txn) error {
+		err := txn.Delete([]byte(k))
+		return err
+	})
+
+	return err
+}
--- a/utils/storage/groupcache.go
+++ b/utils/storage/groupcache.go
@ -0,0 +1,179 @@
+package storage
+
+import (
+	"context"
+	"fmt"
+	"github.com/spf13/viper"
+	"gopkg.in/square/go-jose.v2/json"
+	"log"
+	"net/http"
+	"reflect"
+	"time"
+
+	"github.com/mailgun/groupcache/v2"
+)
+
+type GroupCacheHandler struct {
+	KVHandler KVHandler
+	Group     *groupcache.Group
+	cacheTTL  int64
+}
+
+func NewGroupCacheHandler(cfg *viper.Viper) (*GroupCacheHandler, error) {
+	var (
+		endpoint     = cfg.GetString("storage.kv.groupcache.endpoint")
+		ports        = cfg.GetStringSlice("storage.kv.groupcache.ports")
+		cacheTTL     = cfg.GetInt64("storage.kv.groupcache.cacheTTL")
+		cacheServers []*http.Server
+	)
+
+	var kvHandler KVHandler
+	var getterFunc groupcache.GetterFunc
+	kvType := cfg.GetString("storage.kv.groupcache.db")
+	getterFunc = func(ctx context.Context, key string, dest groupcache.Sink) error {
+		resp, err := kvHandler.Get(key)
+		if err != nil {
+			return err
+		}
+		if resp == nil {
+			return fmt.Errorf("key not found in etcd: %s", key)
+		}
+		jsonResp, err := json.Marshal(resp.(map[string]interface{}))
+		if err != nil {
+			// Handle the error
+		}
+		dest.SetBytes(jsonResp, time.Now().Add(time.Duration(cacheTTL)*time.Minute))
+		return nil
+
+	}
+	switch kvType {
+	case "etcd":
+		etcdHandler, err := NewEtcdHandler(cfg)
+		if err != nil {
+			return nil, err
+		}
+		kvHandler = etcdHandler
+	case "badger":
+		badgerHandler, err := NewBadgerHandler(cfg)
+		if err != nil {
+			return nil, err
+		}
+		kvHandler = badgerHandler
+	default:
+		return nil, fmt.Errorf("unsupported kvType: %s", kvType)
+	}
+
+	pool := groupcache.NewHTTPPoolOpts("", &groupcache.HTTPPoolOptions{})
+	for _, port := range ports {
+		pool.Set("http://" + endpoint + ":" + port)
+		server := &http.Server{
+			Addr:    endpoint + ":" + port,
+			Handler: pool,
+		}
+		cacheServers = append(cacheServers, server)
+		go func(srv *http.Server) {
+			log.Printf("Serving cache server %s \n", srv.Addr)
+			if err := srv.ListenAndServe(); err != nil {
+				log.Fatal(err)
+			}
+		}(server)
+	}
+
+	group := groupcache.NewGroup("data", 3000000, getterFunc)
+	handler := &GroupCacheHandler{
+		KVHandler: kvHandler,
+		Group:     group,
+		cacheTTL:  cacheTTL,
+	}
+
+	return handler, nil
+}
+
+func (h *GroupCacheHandler) Put(k string, v any) error {
+	// Update the value in the underlying key-value store
+	err := h.KVHandler.Put(k, v)
+	if err != nil {
+		return err
+	}
+
+	// Check if the key exists in the cache
+	var value []byte
+	err = h.Group.Get(nil, k, groupcache.AllocatingByteSliceSink(&value))
+	if err == nil {
+		// Key exists in the cache, compare with the new value
+		if !reflect.DeepEqual(value, v) {
+			// Values are different, update the cache
+			jsonValue, err := json.Marshal(v)
+			if err != nil {
+				return err
+			}
+			expireTime := time.Now().Add(time.Duration(h.cacheTTL) * time.Minute)
+			err = h.Group.Set(context.Background(), k, jsonValue, expireTime, false)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+func (h *GroupCacheHandler) PutWithTTL(k string, v any, duration time.Duration) error {
+
+	err := h.KVHandler.PutWithTTL(k, v, duration)
+	// Check if the key exists in the cache
+	var value []byte
+	err = h.Group.Get(nil, k, groupcache.AllocatingByteSliceSink(&value))
+	if err == nil {
+		// Key exists in the cache, compare with the new value
+		if !reflect.DeepEqual(value, v) {
+			// Values are different, update the cache
+			jsonValue, err := json.Marshal(v)
+			if err != nil {
+				return err
+			}
+			expireTime := time.Now().Add(time.Duration(h.cacheTTL) * time.Minute)
+			err = h.Group.Set(context.Background(), k, jsonValue, expireTime, false)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+
+}
+
+func (h *GroupCacheHandler) Get(k string) (any, error) {
+	var value []byte
+	err := h.Group.Get(nil, k, groupcache.AllocatingByteSliceSink(&value))
+	if err != nil {
+		fmt.Println("error", err)
+		return nil, err
+	}
+
+	// If the value is empty, return an empty map
+	if len(value) == 0 {
+		return make(map[string]interface{}), nil
+	}
+
+	var result map[string]interface{}
+	err = json.Unmarshal(value, &result)
+	if err != nil {
+		return nil, err
+	}
+	return result, nil
+
+}
+
+func (h *GroupCacheHandler) Delete(k string) error {
+	err := h.KVHandler.Delete(k)
+	if err != nil {
+		return err
+	}
+	err = h.Group.Remove(context.Background(), k)
+	if err != nil {
+		return err
+	}
+	return nil
+}
--- a/utils/storage/groupcache_etcd.go
+++ b/utils/storage/groupcache_etcd.go
@ -1,108 +0,0 @@
-package storage
-
-import (
-	"context"
-	"encoding/base64"
-	"encoding/json"
-	"errors"
-	"fmt"
-	"log"
-	"net/http"
-	"time"
-
-	"github.com/mailgun/groupcache/v2"
-	"github.com/spf13/viper"
-)
-
-type EtcdGroupCacheHandler struct {
-	EtcdHandler *EtcdHandler
-	Group       *groupcache.Group
-}
-
-func NewEtcdGroupCacheHandler(cfg *viper.Viper) (*EtcdGroupCacheHandler, error) {
-	var (
-		endpoint     = cfg.GetString("storage.kv.groupcache.endpoint")
-		ports        = cfg.GetStringSlice("storage.kv.groupcache.ports")
-		cacheTTL     = cfg.GetInt64("storage.kv.groupcache.cacheTTL")
-		cacheServers []*http.Server
-	)
-	etcdHandler, err := NewEtcdHandler(cfg)
-	if err != nil {
-		return nil, err
-	}
-	pool := groupcache.NewHTTPPoolOpts("", &groupcache.HTTPPoolOptions{})
-	for _, port := range ports {
-		pool.Set("http://" + endpoint + ":" + port)
-		server := &http.Server{
-			Addr:    endpoint + ":" + port,
-			Handler: pool,
-		}
-		cacheServers = append(cacheServers, server)
-		go func(srv *http.Server) {
-			log.Printf("Serving cache server %s \n", srv.Addr)
-			if err := srv.ListenAndServe(); err != nil {
-				log.Fatal(err)
-			}
-		}(server)
-	}
-	group := groupcache.NewGroup("data", 3000000, groupcache.GetterFunc(
-		func(ctx context.Context, key string, dest groupcache.Sink) error {
-
-			resp, err := etcdHandler.Get(key)
-			if err != nil {
-				return err
-			}
-			if resp == nil {
-				return errors.New("key not found in ETCD")
-			}
-			decoded, err := base64.StdEncoding.DecodeString(resp.(string))
-			if err != nil {
-				return fmt.Errorf("failed to decode value for key %s: %v", key, err)
-			}
-			dest.SetString(string(decoded), time.Now().Add(time.Duration(cacheTTL)*time.Minute))
-			return nil
-		},
-	))
-
-	return &EtcdGroupCacheHandler{
-		EtcdHandler: etcdHandler,
-		Group:       group,
-	}, nil
-}
-
-func (h *EtcdGroupCacheHandler) Put(k string, v interface{}) error {
-	value, err := json.Marshal(v)
-	if err != nil {
-		return err
-	}
-	return h.EtcdHandler.Put(k, value)
-}
-
-func (h *EtcdGroupCacheHandler) PutWithTTL(k string, v interface{}, duration time.Duration) error {
-	value, err := json.Marshal(v)
-	if err != nil {
-		return err
-	}
-	return h.EtcdHandler.PutWithTTL(k, value, duration)
-}
-
-func (h *EtcdGroupCacheHandler) Get(k string) (interface{}, error) {
-	var value []byte
-	err := h.Group.Get(nil, k, groupcache.AllocatingByteSliceSink(&value))
-	if err != nil {
-		return nil, err
-	}
-	return value, nil
-}
-
-func (h *EtcdGroupCacheHandler) Delete(k string) error {
-	err := h.EtcdHandler.Delete(k)
-	if err != nil {
-		return err
-	}
-	err = h.Group.Remove(context.Background(), k)
-	if err != nil {
-		return err
-	}
-	return nil
-}
--- a/utils/storage/groupcache_etcd_test.go
+++ b/utils/storage/groupcache_etcd_test.go
@ -1,77 +0,0 @@
-package storage
-
-import (
-	"encoding/json"
-	"github.com/spf13/viper"
-	"testing"
-	"time"
-)
-
-func TestEtcdGroupCacheHandler(t *testing.T) {
-	cfg := createConfig()
-	handler, err := NewEtcdGroupCacheHandler(cfg)
-	if err != nil {
-		t.Fatalf("failed to create EtcdGroupCacheHandler: %v", err)
-	}
-
-	key := "test-key"
-	value := map[string]string{"key1": "value1", "key2": "value2"}
-
-	// test Put and Get
-	err = handler.Put(key, value)
-	if err != nil {
-		t.Fatalf("failed to put key: %v", err)
-	}
-	resp, err := handler.Get(key)
-	if err != nil {
-		t.Fatalf("failed to get key: %v", err)
-	}
-	var result map[string]string
-	err = json.Unmarshal(resp.([]byte), &result)
-	if err != nil {
-		t.Fatalf("failed to unmarshal response: %v", err)
-	}
-
-	if len(result) != len(value) || result["key1"] != value["key1"] || result["key2"] != value["key2"] {
-		t.Fatalf("unexpected response: %v", result)
-	}
-
-	// test PutWithTTL and Get
-	err = handler.PutWithTTL(key, value, time.Second*2)
-	if err != nil {
-		t.Fatalf("failed to put key with TTL: %v", err)
-	}
-	resp, err = handler.Get(key)
-	if err != nil {
-		t.Fatalf("failed to get key: %v", err)
-	}
-	err = json.Unmarshal(resp.([]byte), &result)
-	if err != nil {
-		t.Fatalf("failed to unmarshal response: %v", err)
-	}
-	if len(result) != len(value) || result["key1"] != value["key1"] || result["key2"] != value["key2"] {
-		t.Fatalf("unexpected response: %v", result)
-	}
-
-	// test Delete
-	err = handler.Delete(key)
-	if err != nil {
-		t.Fatalf("failed to delete key: %v", err)
-	}
-	resp, err = handler.Get(key)
-	if err == nil {
-		t.Fatalf("expected key to be deleted")
-	}
-}
-
-func createConfig() *viper.Viper {
-	cfg := viper.New()
-	cfg.Set("storage.kv.etcd.endpoints", []string{"localhost:2379"})
-	cfg.Set("storage.kv.etcd.username", "")
-	cfg.Set("storage.kv.etcd.prefix", "parcoursmob/cache/")
-	cfg.Set("storage.kv.etcd.password", "")
-	cfg.Set("storage.kv.groupcache.endpoint", "localhost")
-	cfg.Set("storage.kv.groupcache.ports", []string{"36000", "36500"})
-	cfg.Set("storage.kv.groupcache.cacheTTL", 10)
-	return cfg
-}
--- a/utils/storage/kv.go
+++ b/utils/storage/kv.go
@ -1,6 +1,7 @@
 package storage

 import (
+	"fmt"
 	"time"

 	"github.com/spf13/viper"
@ -14,5 +15,18 @@ type KVHandler interface {
 }

 func NewKVHandler(cfg *viper.Viper) (KVHandler, error) {
+	cacheType := cfg.GetString("storage.kv.dbType")
+	switch cacheType {
+	case "etcd":
 		return NewEtcdHandler(cfg)
+	case "badger":
+		return NewBadgerHandler(cfg)
+	case "etcdGroupcache":
+		return NewGroupCacheHandler(cfg)
+		fmt.Println("here")
+	case "badgerGroupcache":
+		return NewGroupCacheHandler(cfg)
+	}
+	return nil, nil
+
 }