From 39637fdc6349b1ce2eef87fe0f5da261a86c671f Mon Sep 17 00:00:00 2001
From: vadimi <vadim.ivanou@gmail.com>
Date: Fri, 9 Sep 2022 09:56:04 -0400
Subject: [PATCH] additional proto files are optional

---
 internal/caller/parseprotos.go     | 5 ++++-
 internal/caller/servicemetabase.go | 4 ++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/internal/caller/parseprotos.go b/internal/caller/parseprotos.go
index 3f0bc6e..29655c9 100644
--- a/internal/caller/parseprotos.go
+++ b/internal/caller/parseprotos.go
@@ -1,6 +1,7 @@
 package caller
 
 import (
+	"errors"
 	"fmt"
 	"io"
 	"io/fs"
@@ -12,6 +13,8 @@ import (
 	clifs "github.com/vadimi/grpc-client-cli/internal/fs"
 )
 
+var errNoProtoFilesFound = errors.New("no proto files found")
+
 func parseProtoFiles(protoDirs []string, protoImports []string) ([]*desc.FileDescriptor, error) {
 	protofiles, err := findProtoFiles(protoDirs)
 	if err != nil {
@@ -19,7 +22,7 @@ func parseProtoFiles(protoDirs []string, protoImports []string) ([]*desc.FileDes
 	}
 
 	if len(protofiles) == 0 {
-		return nil, fmt.Errorf("no proto files found in %s", protoDirs)
+		return nil, fmt.Errorf("%w: %s", errNoProtoFilesFound, protoDirs)
 	}
 
 	importPaths := []string{}
diff --git a/internal/caller/servicemetabase.go b/internal/caller/servicemetabase.go
index 36a1c8d..792cfae 100644
--- a/internal/caller/servicemetabase.go
+++ b/internal/caller/servicemetabase.go
@@ -2,6 +2,7 @@ package caller
 
 import (
 	"context"
+	"errors"
 	"fmt"
 
 	"github.com/jhump/protoreflect/desc"
@@ -37,6 +38,9 @@ func (s serviceMetaBase) GetAdditionalFiles(protoImports []string) ([]*desc.File
 	}
 	fileDesc, err := parseProtoFiles(protoImports, nil)
 	if err != nil {
+		if errors.Is(err, errNoProtoFilesFound) {
+			return nil, nil
+		}
 		return nil, fmt.Errorf("error parsing additional proto files: %w", err)
 	}
 	return fileDesc, nil