167 lines
3.9 KiB
Go
167 lines
3.9 KiB
Go
package middleware
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import (
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"fmt"
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"sync"
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"time"
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"tyapi-server/internal/config"
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"tyapi-server/internal/shared/interfaces"
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"github.com/gin-gonic/gin"
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"golang.org/x/time/rate"
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)
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// RateLimitMiddleware 限流中间件
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type RateLimitMiddleware struct {
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config *config.Config
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response interfaces.ResponseBuilder
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limiters map[string]*rate.Limiter
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mutex sync.RWMutex
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}
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// NewRateLimitMiddleware 创建限流中间件
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func NewRateLimitMiddleware(cfg *config.Config, response interfaces.ResponseBuilder) *RateLimitMiddleware {
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return &RateLimitMiddleware{
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config: cfg,
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response: response,
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limiters: make(map[string]*rate.Limiter),
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}
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}
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// GetName 返回中间件名称
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func (m *RateLimitMiddleware) GetName() string {
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return "ratelimit"
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}
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// GetPriority 返回中间件优先级
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func (m *RateLimitMiddleware) GetPriority() int {
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return 90 // 高优先级
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}
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// Handle 返回中间件处理函数
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func (m *RateLimitMiddleware) Handle() gin.HandlerFunc {
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return func(c *gin.Context) {
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// 获取客户端标识（IP地址）
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clientID := m.getClientID(c)
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// 获取或创建限流器
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limiter := m.getLimiter(clientID)
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// 检查是否允许请求
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if !limiter.Allow() {
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// 添加限流头部信息
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c.Header("X-RateLimit-Limit", fmt.Sprintf("%d", m.config.RateLimit.Requests))
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c.Header("X-RateLimit-Window", m.config.RateLimit.Window.String())
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c.Header("Retry-After", "60")
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// 使用统一的响应格式
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m.response.TooManyRequests(c, "请求过于频繁，请稍后再试")
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c.Abort()
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return
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}
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// 添加限流头部信息
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c.Header("X-RateLimit-Limit", fmt.Sprintf("%d", m.config.RateLimit.Requests))
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c.Header("X-RateLimit-Window", m.config.RateLimit.Window.String())
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c.Next()
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}
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}
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// IsGlobal 是否为全局中间件
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func (m *RateLimitMiddleware) IsGlobal() bool {
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return true
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}
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// getClientID 获取客户端标识
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func (m *RateLimitMiddleware) getClientID(c *gin.Context) string {
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// 优先使用X-Forwarded-For头部
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if xff := c.GetHeader("X-Forwarded-For"); xff != "" {
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return xff
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}
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// 使用X-Real-IP头部
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if xri := c.GetHeader("X-Real-IP"); xri != "" {
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return xri
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}
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// 使用RemoteAddr
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return c.ClientIP()
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}
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// getLimiter 获取或创建限流器
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func (m *RateLimitMiddleware) getLimiter(clientID string) *rate.Limiter {
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m.mutex.RLock()
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limiter, exists := m.limiters[clientID]
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m.mutex.RUnlock()
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if exists {
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return limiter
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}
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m.mutex.Lock()
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defer m.mutex.Unlock()
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// 双重检查
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if limiter, exists := m.limiters[clientID]; exists {
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return limiter
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}
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// 创建新的限流器
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// rate.Every计算每个请求之间的间隔
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rateLimit := rate.Every(m.config.RateLimit.Window / time.Duration(m.config.RateLimit.Requests))
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limiter = rate.NewLimiter(rateLimit, m.config.RateLimit.Burst)
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m.limiters[clientID] = limiter
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// 启动清理协程（仅第一次创建时）
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if len(m.limiters) == 1 {
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go m.cleanupRoutine()
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}
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return limiter
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}
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// cleanupRoutine 定期清理不活跃的限流器
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func (m *RateLimitMiddleware) cleanupRoutine() {
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ticker := time.NewTicker(10 * time.Minute) // 每10分钟清理一次
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defer ticker.Stop()
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for {
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select {
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case <-ticker.C:
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m.cleanup()
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}
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}
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}
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// cleanup 清理不活跃的限流器
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func (m *RateLimitMiddleware) cleanup() {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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now := time.Now()
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for clientID, limiter := range m.limiters {
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// 如果限流器在过去1小时内没有被使用，则删除它
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if limiter.Reserve().Delay() == 0 && now.Sub(time.Now()) > time.Hour {
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delete(m.limiters, clientID)
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}
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}
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}
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// GetStats 获取限流统计
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func (m *RateLimitMiddleware) GetStats() map[string]interface{} {
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m.mutex.RLock()
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defer m.mutex.RUnlock()
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return map[string]interface{}{
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"active_limiters": len(m.limiters),
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"rate_limit": map[string]interface{}{
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"requests": m.config.RateLimit.Requests,
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"window": m.config.RateLimit.Window,
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"burst": m.config.RateLimit.Burst,
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},
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}
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}
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