feat: 知识图谱测试api

backend/handlers/node_handler.go

@@ -0,0 +1,69 @@
+package handlers
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"knowledge-graph-backend/services"
+)
+
+type NodeHandler struct {
+	dataService *services.DataService
+}
+
+func NewNodeHandler(dataService *services.DataService) *NodeHandler {
+	return &NodeHandler{
+		dataService: dataService,
+	}
+}
+
+func (h *NodeHandler) GetNodeByID(c *gin.Context) {
+	nodeID := c.Param("id")
+	if nodeID == "" {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"error":   "Bad Request",
+			"message": "Node ID is required",
+		})
+		return
+	}
+
+	node, found := h.dataService.GetNodeByID(nodeID)
+	if !found {
+		c.JSON(http.StatusNotFound, gin.H{
+			"error":   "Not Found",
+			"message": "Node with ID '" + nodeID + "' not found",
+		})
+		return
+	}
+
+	c.JSON(http.StatusOK, node)
+}
+
+func (h *NodeHandler) GetNeighbors(c *gin.Context) {
+	nodeID := c.Param("id")
+	if nodeID == "" {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"error":   "Bad Request",
+			"message": "Node ID is required",
+		})
+		return
+	}
+
+	neighbors, found := h.dataService.GetNeighbors(nodeID)
+	if !found {
+		c.JSON(http.StatusNotFound, gin.H{
+			"error":   "Not Found",
+			"message": "Node with ID '" + nodeID + "' not found",
+		})
+		return
+	}
+
+	c.JSON(http.StatusOK, neighbors)
+}
+
+func (h *NodeHandler) AddCustomHeaders(c *gin.Context) {
+	c.JSON(http.StatusOK, gin.H{
+		"message": "With CORS headers",
+		"origin":  c.Request.Header.Get("Origin"),
+	})
+}