Initial commit: CarrotAssistant backend (Go + Gin + SQLite, OpenAI-compatible agent runtime)

internal/server/util.go

@@ -0,0 +1,49 @@
+package server
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"gorm.io/datatypes"
+)
+
+// marshalJSON converts a map to datatypes.JSON for storage. Returns nil on
+// nil input so empty detail columns stay NULL-ish rather than "null".
+func marshalJSON(m map[string]any) datatypes.JSON {
+	if m == nil {
+		return nil
+	}
+	b, err := json.Marshal(m)
+	if err != nil {
+		return datatypes.JSON([]byte("{}"))
+	}
+	return b
+}
+
+// bind parses the JSON request body into out and writes a 400 on failure.
+// Returns false (and aborts) when the body is invalid so callers can early-return.
+func bind(c *gin.Context, out any) bool {
+	if err := c.ShouldBindJSON(out); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请求参数无效: " + err.Error()})
+		return false
+	}
+	return true
+}
+
+// jsonRaw marshals v to datatypes.JSON for storage in a JSON column.
+func jsonRaw(v any) datatypes.JSON {
+	b, err := json.Marshal(v)
+	if err != nil {
+		return datatypes.JSON([]byte("null"))
+	}
+	return b
+}
+
+// jsonUnmarshal decodes a datatypes.JSON value into out.
+func jsonUnmarshal(raw datatypes.JSON, out any) error {
+	if len(raw) == 0 {
+		return nil
+	}
+	return json.Unmarshal(raw, out)
+}