refactor(sdk): extract checkHeader into the separate file

Author: esifea

header.go

@@ -0,0 +1,25 @@
+package envector
+
+import (
+	"fmt"
+	"strings"
+
+	es2pb "github.com/CryptoLabInc/envector-go-sdk/internal/transport/pb/es2"
+)
+
+// Marks a server side idempotency rejection
+const alreadyExistsPrefix = "ALREADY_EXISTS:"
+
+// Shared by gRPC in SDK which returns ResponseHeader
+func checkHeader(rpc string, h *es2pb.ResponseHeader) error {
+	if h == nil {
+		return nil
+	}
+	if rc := h.GetReturnCode(); rc != es2pb.ReturnCode_Success {
+		if strings.HasPrefix(h.GetErrorMessage(), alreadyExistsPrefix) {
+			return fmt.Errorf("envector: %s: %w: %s", rpc, ErrAlreadyExists, h.GetErrorMessage())
+		}
+		return fmt.Errorf("envector: %s: server returned %s: %s", rpc, rc, h.GetErrorMessage())
+	}
+	return nil
+}

index.go

@@ -3,7 +3,6 @@ package envector
 import (
 	"context"
 	"fmt"
-	"strings"
 
 	es2pb "github.com/CryptoLabInc/envector-go-sdk/internal/transport/pb/es2"
 	es2epb "github.com/CryptoLabInc/envector-go-sdk/internal/transport/pb/es2e"
@@ -123,16 +122,4 @@ func (i *Index) Drop(ctx context.Context) error {
 	return checkHeader("delete_index", resp.GetHeader())
 }
 
-func checkHeader(rpc string, h *es2pb.ResponseHeader) error {
-	if h == nil {
-		return nil
-	}
-	if rc := h.GetReturnCode(); rc != es2pb.ReturnCode_Success {
-		if strings.HasPrefix(h.GetErrorMessage(), alreadyExistsPrefix) {
-			return fmt.Errorf("envector: %s: %w: %s", rpc, ErrAlreadyExists, h.GetErrorMessage())
-		}
-		return fmt.Errorf("envector: %s: server returned %s: %s", rpc, rc, h.GetErrorMessage())
-	}
-	return nil
-}
 

insert.go

@@ -10,9 +10,6 @@ import (
 
 const insertChunkSize = 1 * 1024 * 1024
 
-// Marker when request_id collides with previously committed operation
-const alreadyExistsPrefix = "ALREADY_EXISTS:"
-
 // InsertRequest carries plaintext vectors and one parallel metadata string
 // per vector. Metadata is stored verbatim — the SDK never interprets it
 // (callers commonly pass a JSON envelope; opaque blobs work equally well).