Function NewModelFallbackManager

pkg/agent/model_fallback.go:60–101

NewModelFallbackManager 创建模型降级管理器

(fallbacks []*ModelFallback, deps *Dependencies)

// NewModelFallbackManager 创建模型降级管理器
func NewModelFallbackManager(fallbacks []*ModelFallback, deps *Dependencies) (*ModelFallbackManager, error) {
	if len(fallbacks) == 0 {
		return nil, errors.New("at least one model fallback is required")
	}

	// 按优先级排序
	sortedFallbacks := make([]*ModelFallback, len(fallbacks))
	copy(sortedFallbacks, fallbacks)

	// 简单的冒泡排序（因为通常模型数量不多）
	for i := range len(sortedFallbacks) - 1 {
		for j := range len(sortedFallbacks) - i - 1 {
			if sortedFallbacks[j].Priority > sortedFallbacks[j+1].Priority {
				sortedFallbacks[j], sortedFallbacks[j+1] = sortedFallbacks[j+1], sortedFallbacks[j]
			}
		}
	}

	// 初始化 Provider 实例
	for _, fb := range sortedFallbacks {
		if !fb.Enabled {
			continue
		}

		prov, err := deps.ProviderFactory.Create(fb.Config)
		if err != nil {
			fallbackLog.Warn(context.Background(), "failed to create provider", map[string]any{"provider": fb.Config.Provider, "model": fb.Config.Model, "error": err})
			fb.Enabled = false
			continue
		}
		fb.provider = prov
	}

	return &ModelFallbackManager{
		fallbacks:    sortedFallbacks,
		deps:         deps,
		currentIndex: 0,
		stats: &FallbackStats{
			ModelUsageCount: make(map[string]int64),
		},
	}, nil
}

// Complete 执行非流式请求，支持自动降级
func (m *ModelFallbackManager) Complete(