系统配置重构，支持后台管理页面配置

api/service/config_service.go

@@ -0,0 +1,146 @@
+package service
+
+// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+// Copyright 2023 The Geek-AI Authors. All rights reserved.
+// Use of this source code is governed by a Apache-2.0 license
+// that can be found in the LICENSE file.
+// @Author yangjian102621@163.com
+// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"geekai/store/model"
+	"sync"
+
+	"github.com/go-redis/redis/v8"
+	"gorm.io/gorm"
+)
+
+// ConfigService 统一的配置访问、缓存与通知服务
+type ConfigService struct {
+	db       *gorm.DB
+	rdb      *redis.Client
+	mu       sync.RWMutex
+	cache    map[string]json.RawMessage
+	watchers map[string][]chan struct{}
+}
+
+func NewConfigService(db *gorm.DB, rdb *redis.Client) *ConfigService {
+	s := &ConfigService{
+		db:       db,
+		rdb:      rdb,
+		cache:    make(map[string]json.RawMessage),
+		watchers: make(map[string][]chan struct{}),
+	}
+	go s.subscribe()
+	return s
+}
+
+// Get 以原始 JSON 获取配置（带本地缓存）
+func (s *ConfigService) Get(key string) (json.RawMessage, error) {
+	s.mu.RLock()
+	if v, ok := s.cache[key]; ok {
+		s.mu.RUnlock()
+		return v, nil
+	}
+	s.mu.RUnlock()
+
+	var cfg model.Config
+	if err := s.db.Where("name", key).First(&cfg).Error; err != nil {
+		return nil, err
+	}
+	s.mu.Lock()
+	s.cache[key] = json.RawMessage(cfg.Value)
+	s.mu.Unlock()
+	return json.RawMessage(cfg.Value), nil
+}
+
+// GetInto 将配置解析进传入结构体
+func (s *ConfigService) GetInto(key string, dest interface{}) error {
+	data, err := s.Get(key)
+	if err != nil {
+		return err
+	}
+	if len(data) == 0 {
+		return nil
+	}
+	return json.Unmarshal(data, dest)
+}
+
+// Set 设置配置并写入数据库，同时触发通知
+func (s *ConfigService) Set(key string, config json.RawMessage) error {
+	value := string(config)
+	cfg := model.Config{Name: key, Value: value}
+	if err := s.db.Where("name", key).FirstOrCreate(&cfg, model.Config{Name: key}).Error; err != nil {
+		return err
+	}
+	if cfg.Id > 0 {
+		cfg.Value = value
+		if err := s.db.Updates(&cfg).Error; err != nil {
+			return err
+		}
+	}
+	s.mu.Lock()
+	s.cache[key] = json.RawMessage(value)
+	s.mu.Unlock()
+	s.notifyLocal(key)
+	s.publish(key)
+	return nil
+}
+
+// Watch 返回一个通道，当指定 key 发生变化时收到事件
+func (s *ConfigService) Watch(key string) <-chan struct{} {
+	ch := make(chan struct{}, 1)
+	s.mu.Lock()
+	s.watchers[key] = append(s.watchers[key], ch)
+	s.mu.Unlock()
+	return ch
+}
+
+func (s *ConfigService) notifyLocal(key string) {
+	s.mu.RLock()
+	list := s.watchers[key]
+	s.mu.RUnlock()
+	for _, ch := range list {
+		select { // 非阻塞通知
+		case ch <- struct{}{}:
+		default:
+		}
+	}
+}
+
+// 通过 Redis 发布配置变更，便于多实例同步
+func (s *ConfigService) publish(key string) {
+	if s.rdb == nil {
+		return
+	}
+	channel := "config:changed"
+	if err := s.rdb.Publish(context.Background(), channel, key).Err(); err != nil {
+		logger.Warnf("publish config change failed: %v", err)
+	}
+}
+
+func (s *ConfigService) subscribe() {
+	if s.rdb == nil {
+		return
+	}
+	channel := "config:changed"
+	sub := s.rdb.Subscribe(context.Background(), channel)
+	for msg := range sub.Channel() {
+		key := msg.Payload
+		logger.Infof("config changed: %s", key)
+		// 失效本地缓存并本地广播
+		s.mu.Lock()
+		delete(s.cache, key)
+		s.mu.Unlock()
+		s.notifyLocal(key)
+	}
+}
+
+// Test 预留统一测试入口，根据 key 执行连通性检查
+func (s *ConfigService) Test(key string) (string, error) {
+	// TODO: 实现各配置类型的测试逻辑
+	return fmt.Sprintf("%s ok", key), nil
+}