Refactor: 统一配置类

backend/config/config.go

@@ -0,0 +1,88 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"time"
+
+	"github.com/gin-contrib/cors"
+	"github.com/joho/godotenv"
+)
+
+type ServerConfig struct {
+	Port string
+}
+
+type Neo4jConfig struct {
+	URI      string
+	Username string
+	Password string
+}
+
+type DataConfig struct {
+	FilePath string
+}
+
+type CORSConfig struct {
+	AllowOrigins     []string
+	AllowMethods     []string
+	AllowHeaders     []string
+	ExposeHeaders    []string
+	AllowCredentials bool
+	MaxAge           time.Duration
+}
+
+type Config struct {
+	Server ServerConfig
+	Neo4j  Neo4jConfig
+	Data   DataConfig
+	CORS   CORSConfig
+}
+
+func Load() (*Config, error) {
+	if err := godotenv.Load("../config/.env"); err != nil {
+		return nil, fmt.Errorf("error loading .env file: %w", err)
+	}
+
+	cfg := &Config{
+		Server: ServerConfig{
+			Port: getEnv("PORT", "3001"),
+		},
+		Neo4j: Neo4jConfig{
+			URI:      os.Getenv("NEO4J_URI"),
+			Username: os.Getenv("NEO4J_USERNAME"),
+			Password: os.Getenv("NEO4J_PASSWORD"),
+		},
+		Data: DataConfig{
+			FilePath: getEnv("DATA_FILE", "data.json"),
+		},
+		CORS: CORSConfig{
+			AllowOrigins:     []string{"http://localhost:5173", "http://localhost:3000"},
+			AllowMethods:     []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
+			AllowHeaders:     []string{"Origin", "Content-Type", "Authorization", "Accept"},
+			ExposeHeaders:    []string{"Content-Length", "Content-Type"},
+			AllowCredentials: true,
+			MaxAge:           12 * time.Hour,
+		},
+	}
+
+	return cfg, nil
+}
+
+func (c *CORSConfig) ToGinConfig() cors.Config {
+	return cors.Config{
+		AllowOrigins:     c.AllowOrigins,
+		AllowMethods:     c.AllowMethods,
+		AllowHeaders:     c.AllowHeaders,
+		ExposeHeaders:    c.ExposeHeaders,
+		AllowCredentials: c.AllowCredentials,
+		MaxAge:           c.MaxAge,
+	}
+}
+
+func getEnv(key, defaultValue string) string {
+	if value := os.Getenv(key); value != "" {
+		return value
+	}
+	return defaultValue
+}

backend/main.go

@@ -1,4 +1,4 @@
-package neo4j
+package main
 
 import (
 	"log"
@@ -7,18 +7,18 @@ import (
 	"github.com/gin-contrib/cors"
 	"github.com/gin-gonic/gin"
 
+	"knowledge-graph-backend/config"
 	"knowledge-graph-backend/handlers"
 	"knowledge-graph-backend/services"
 )
 
-const (
-	PORT      = "3001"
-	DATA_FILE = "data.json"
-)
+func main() {
+	cfg, err := config.Load()
+	if err != nil {
+		log.Fatalf("Failed to load config: %v", err)
+	}
 
-func test() {
-
-	dataService, err := services.NewDataService(DATA_FILE)
+	dataService, err := services.NewDataService(cfg.Data.FilePath)
 	if err != nil {
 		log.Fatalf("Failed to initialize data service: %v", err)
 	}
@@ -29,14 +29,7 @@ func test() {
 
 	router := gin.Default()
 
-	router.Use(cors.New(cors.Config{
-		AllowOrigins:     []string{"http://localhost:5173", "http://localhost:3000"},
-		AllowMethods:     []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
-		AllowHeaders:     []string{"Origin", "Content-Type", "Authorization", "Accept"},
-		ExposeHeaders:    []string{"Content-Length", "Content-Type"},
-		AllowCredentials: true,
-		MaxAge:           12 * 3600,
-	}))
+	router.Use(cors.New(cfg.CORS.ToGinConfig()))
 
 	router.GET("/health", func(c *gin.Context) {
 		c.JSON(http.StatusOK, gin.H{
@@ -57,8 +50,8 @@ func test() {
 		api.GET("/nodes/:id/neighbors", nodeHandler.GetNeighbors)
 	}
 
-	log.Println("Knowledge Graph API Server running on http://localhost:" + PORT)
-	log.Println("Data file loaded from: " + DATA_FILE)
+	log.Println("Knowledge Graph API Server running on http://localhost:" + cfg.Server.Port)
+	log.Println("Data file loaded from: " + cfg.Data.FilePath)
 	log.Println("Available endpoints:")
 	log.Println("  GET /health - Health check")
 	log.Println("  GET /api/graph - Get all graph data")
@@ -67,7 +60,7 @@ func test() {
 	log.Println("  GET /api/nodes/:id - Get node by ID")
 	log.Println("  GET /api/nodes/:id/neighbors - Get node neighbors")
 
-	if err := router.Run(":" + PORT); err != nil {
+	if err := router.Run(":" + cfg.Server.Port); err != nil {
 		log.Fatalf("Failed to start server: %v", err)
 	}
 }

backend/neo4j/client.go

@@ -3,46 +3,25 @@ package neo4j
 import (
 	"context"
 	"fmt"
-	"log"
-	"os"
 
-	"github.com/joho/godotenv"
 	"github.com/neo4j/neo4j-go-driver/v5/neo4j"
+
+	"knowledge-graph-backend/config"
 )
 
-var (
-	NEO4J_URI string
-	NEO4J_USERNAME string
-	NEO4J_PASSWORD string
-)
+func DoConnect(cfg config.Neo4jConfig) {
+	ctx := context.Background()
+	driver, err := neo4j.NewDriverWithContext(
+		cfg.URI,
+		neo4j.BasicAuth(cfg.Username, cfg.Password, ""))
+	if err != nil {
+		panic(err)
+	}
+	defer driver.Close(ctx)
 
-func init() {
-	err := godotenv.Load()
-  if err != nil {
-    log.Fatal("Error loading .env file")
-  }
-
-  NEO4J_URI = os.Getenv("NEO4J_URI")
-  NEO4J_USERNAME = os.Getenv("NEO4J_USERNAME")
-  NEO4J_PASSWORD = os.Getenv("NEO4J_PASSWORD")
-}
-
-func doConnect() {
-    ctx := context.Background()
-    // dbUri := "<database-uri>"
-    // dbUser := "<username>"
-    // dbPassword := "<password>"
-    driver, err := neo4j.NewDriverWithContext(
-        NEO4J_URI,
-        neo4j.BasicAuth(NEO4J_USERNAME, NEO4J_PASSWORD, ""))
-    if err != nil {
-        panic(err)
-    }
-    defer driver.Close(ctx)
-
-    err = driver.VerifyConnectivity(ctx)
-    if err != nil {
-        panic(err)
-    }
-    fmt.Println("Connection established.")
+	err = driver.VerifyConnectivity(ctx)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("Connection established.")
 }

backend/neo4j/client_test.go

@@ -1,7 +1,20 @@
 package neo4j
 
-import "testing"
+import (
+	"testing"
 
-func TestDoConnect(t *testing.T){
-	doConnect()	
-}
+	"knowledge-graph-backend/config"
+)
+
+func TestDoConnect(t *testing.T) {
+	cnf, err := config.Load()
+	if err != nil {
+		t.Errorf("[cnf]: %v", err)
+	}
+	cfg := config.Neo4jConfig{
+		URI:      cnf.Neo4j.URI,
+		Username: cnf.Neo4j.Username,
+		Password: cnf.Neo4j.Password,
+	}
+	DoConnect(cfg)
+}