fix: validate recipe name and plugin in gen

cmd/gen.go

@@ -57,9 +57,17 @@ func GenRecipeCmd() *cobra.Command {
 			"group:core": "true",
 		},
 		RunE: func(cmd *cobra.Command, args []string) error {
-			sinkList := strings.Split(sinks, ",")
-			procList := strings.Split(processors, ",")
 
+			var sinkList []string
+			var procList []string
+
+			if sinks != "" {
+				sinkList = strings.Split(sinks, ",")
+			}
+
+			if processors != "" {
+				procList = strings.Split(processors, ",")
+			}
 			return generator.Recipe(args[0], extractor, sinkList, procList)
 		},
 	}

generator/recipe.go

@@ -23,25 +23,39 @@ type Template struct {
 }
 
 // Recipe checks if the recipe is valid and returns a Template
-func Recipe(name string, source string, sinks []string, processors []string) error {
+func Recipe(name string, source string, sinks []string, processors []string) (err error) {
 	tem := Template{
-		Name:       name,
-		Source:     make(map[string]string),
-		Sinks:      make(map[string]string),
-		Processors: make(map[string]string),
+		Name: name,
 	}
 
-	sinfo, _ := registry.Extractors.Info(source)
-	tem.Source[source] = indent.String(sinfo.SampleConfig, size)
-
-	for _, sink := range sinks {
-		info, _ := registry.Sinks.Info(sink)
-		tem.Sinks[sink] = indent.String(info.SampleConfig, size+3)
+	if source != "" {
+		tem.Source = make(map[string]string)
+		sinfo, err := registry.Extractors.Info(source)
+		if err != nil {
+			return err
+		}
+		tem.Source[source] = indent.String(sinfo.SampleConfig, size)
+	}
+	if len(sinks) > 0 {
+		tem.Sinks = make(map[string]string)
+		for _, sink := range sinks {
+			info, err := registry.Sinks.Info(sink)
+			if err != nil {
+				return err
+			}
+			tem.Sinks[sink] = indent.String(info.SampleConfig, size+3)
+		}
 	}
 
-	for _, procc := range processors {
-		info, _ := registry.Processors.Info(procc)
-		tem.Processors[procc] = indent.String(info.SampleConfig, size+3)
+	if len(processors) > 0 {
+		tem.Processors = make(map[string]string)
+		for _, procc := range processors {
+			info, err := registry.Processors.Info(procc)
+			if err != nil {
+				return err
+			}
+			tem.Processors[procc] = indent.String(info.SampleConfig, size+3)
+		}
 	}
 
 	tmpl, err := template.ParseFS(file, "*")

generator/recipe.yaml

@@ -4,13 +4,21 @@ source:
   type: {{$key}}
   config: {{$value}}
 {{- end }}
+{{- if ne (len .Sinks) 0 }}
 sinks:
 {{- range $key, $value := .Sinks }}
   - name: {{$key}}
+    {{- if  $value}}
     config: {{$value}}
+    {{- end }}    
 {{- end }}
+{{- end }}
+{{- if ne (len .Processors) 0 }}
 processors:
 {{- range $key, $value := .Processors }}
   - name: {{$key}}
+    {{- if  $value}}
     config: {{$value}}
-{{- end }}
+    {{- end }}
+{{- end }}
+{{- end }}