[SMG-GO] implement a Go SGLang Model Gateway - OpenAI Compatible API Server (#14770)

sgl-model-gateway/bindings/golang/examples/oai_server/utils/utils.go

@@ -0,0 +1,34 @@
+package utils
+
+import (
+	"encoding/json"
+
+	"github.com/valyala/fasthttp"
+)
+
+// RespondError sends an error response in OpenAI format
+func RespondError(ctx *fasthttp.RequestCtx, statusCode int, message, errorType string) {
+	ctx.SetStatusCode(statusCode)
+	ctx.SetContentType("application/json")
+
+	response := map[string]interface{}{
+		"error": map[string]interface{}{
+			"message": message,
+			"type":    errorType,
+			"code":    statusCode,
+		},
+	}
+
+	jsonData, _ := json.Marshal(response)
+	ctx.Write(jsonData)
+}
+
+// BuildResponseBase builds the base response structure for OpenAI-compatible responses
+func BuildResponseBase(id string, created int64, model string) map[string]interface{} {
+	return map[string]interface{}{
+		"id":      id,
+		"object":  "chat.completion",
+		"created": created,
+		"model":   model,
+	}
+}