first commit

provider/memcache/provider.go

@@ -0,0 +1,52 @@
+package memcache
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/bradfitz/gomemcache/memcache"
+	"gitoa.ru/go-4devs/cache"
+)
+
+// New memcache provider.
+func New(client *memcache.Client) cache.Provider {
+	return func(ctx context.Context, operation string, item *cache.Item) error {
+		key := item.Key.String()
+
+		switch operation {
+		case cache.OperationGet:
+			ci, err := client.Get(item.Key.String())
+
+			switch {
+			case errors.Is(err, memcache.ErrCacheMiss):
+				return wrapErr(cache.ErrCacheMiss)
+			case errors.Is(err, memcache.ErrMalformedKey):
+				return wrapErr(cache.ErrKeyNotValid)
+			case err != nil:
+				return wrapErr(err)
+			}
+
+			return wrapErr(item.Unmarshal(ci.Value))
+		case cache.OperationSet:
+			data, err := item.Marshal()
+			if err != nil {
+				return wrapErr(err)
+			}
+
+			return wrapErr(client.Set(&memcache.Item{Key: key, Flags: 0, Value: data, Expiration: int32(item.TTL.Seconds())}))
+		case cache.OperationDelete:
+			return wrapErr(client.Delete(key))
+		}
+
+		return wrapErr(cache.ErrOperationNotAllwed)
+	}
+}
+
+func wrapErr(err error) error {
+	if err != nil {
+		return fmt.Errorf("%w: memcache", err)
+	}
+
+	return nil
+}

provider/memcache/provider_test.go

@@ -0,0 +1,14 @@
+package memcache_test
+
+import (
+	"testing"
+
+	"gitoa.ru/go-4devs/cache"
+	"gitoa.ru/go-4devs/cache/provider/memcache"
+	"gitoa.ru/go-4devs/cache/test"
+)
+
+func TestProvider(t *testing.T) {
+	t.Parallel()
+	test.RunSute(t, memcache.New(test.MemcacheClient()), test.WithExpire(cache.ErrCacheMiss))
+}