539 lines
12 KiB
Go
539 lines
12 KiB
Go
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package middleware
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import (
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"net/http"
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"net/http/httptest"
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"sync"
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"testing"
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"time"
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)
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// TestP005_TokenBucketAlgorithm 验证令牌桶算法
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func TestP005_TokenBucketAlgorithm(t *testing.T) {
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bucket := NewTokenBucket(10, 1) // 容量10，补充速率1/秒
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// 初始有10个令牌
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if !bucket.Allow() {
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t.Error("first 10 requests should be allowed")
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}
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// 消耗完令牌
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for i := 0; i < 9; i++ {
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bucket.Allow()
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}
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// 第11个请求应该被拒绝（没有令牌）
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if bucket.Allow() {
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t.Error("request beyond capacity should be denied")
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}
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t.Log("P0-05: 令牌桶容量验证通过")
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}
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// TestP005_TokenBucketRefill 验证令牌补充
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func TestP005_TokenBucketRefill(t *testing.T) {
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bucket := NewTokenBucket(5, 100) // 容量5，补充速率100/秒
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// 消耗所有令牌
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for i := 0; i < 5; i++ {
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bucket.Allow()
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}
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// 应该没有令牌了
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if bucket.Allow() {
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t.Error("bucket should be empty")
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}
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// 等待20ms，应该补充2个令牌 (100/秒 = 1/10ms, 20ms = 2)
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time.Sleep(20 * time.Millisecond)
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if !bucket.Allow() {
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t.Error("after refill, request should be allowed")
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}
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t.Log("P0-05: 令牌补充验证通过")
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}
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// TestP005_RateLimitHeaders 验证限流响应头
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func TestP005_RateLimitHeaders(t *testing.T) {
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config := RateLimitConfig{
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Enabled: true,
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Requests: 100,
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Window: time.Minute,
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HeaderType: "X-RateLimit",
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}
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handler := &RateLimitMiddleware{
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config: &config,
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buckets: make(map[string]*TokenBucket),
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next: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.Write([]byte("ok"))
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}),
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}
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req := httptest.NewRequest("GET", "/test", nil)
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w := httptest.NewRecorder()
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handler.ServeHTTP(w, req)
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// 验证响应头存在
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if w.Header().Get("X-RateLimit-Limit") == "" {
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t.Error("X-RateLimit-Limit header should be present")
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}
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if w.Header().Get("X-RateLimit-Remaining") == "" {
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t.Error("X-RateLimit-Remaining header should be present")
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}
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if w.Header().Get("X-RateLimit-Reset") == "" {
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t.Error("X-RateLimit-Reset header should be present")
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}
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t.Log("P0-05: 限流响应头验证通过")
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}
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// TestP005_MultiDimensionRateLimit 验证多维度限流
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func TestP005_MultiDimensionRateLimit(t *testing.T) {
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// 模拟多租户限流
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tenantLimits := map[string]*TokenBucket{
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"tenant_1": NewTokenBucket(100, 10),
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"tenant_2": NewTokenBucket(50, 5),
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}
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// tenant_1 100个请求应该通过
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for i := 0; i < 100; i++ {
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if !tenantLimits["tenant_1"].Allow() {
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t.Errorf("tenant_1 request %d should be allowed", i)
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}
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}
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// tenant_1 第101个应该拒绝
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if tenantLimits["tenant_1"].Allow() {
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t.Error("tenant_1 exceeded limit")
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}
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// tenant_2 50个请求应该通过
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for i := 0; i < 50; i++ {
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if !tenantLimits["tenant_2"].Allow() {
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t.Errorf("tenant_2 request %d should be allowed", i)
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}
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}
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// tenant_2 第51个应该拒绝
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if tenantLimits["tenant_2"].Allow() {
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t.Error("tenant_2 exceeded limit")
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}
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t.Log("P0-05: 多维度限流验证通过")
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}
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// TestP005_RateLimitConcurrency 验证并发安全性
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func TestP005_RateLimitConcurrency(t *testing.T) {
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bucket := NewTokenBucket(100, 0) // 容量100，不补充
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var allowed int
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var mu sync.Mutex
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var wg sync.WaitGroup
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// 200个并发请求
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for i := 0; i < 200; i++ {
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wg.Add(1)
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go func() {
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defer wg.Done()
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if bucket.Allow() {
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mu.Lock()
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allowed++
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mu.Unlock()
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}
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}()
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}
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wg.Wait()
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// 应该只有100个通过
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if allowed != 100 {
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t.Errorf("expected 100 allowed, got %d", allowed)
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}
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t.Log("P0-05: 并发安全性验证通过")
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}
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// TestP005_DegradationOnLimitExceeded 验证限流后降级
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func TestP005_DegradationOnLimitExceeded(t *testing.T) {
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config := RateLimitConfig{
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Enabled: true,
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Requests: 10,
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Window: time.Second,
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DegradationEnabled: true,
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DegradationHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusTooManyRequests)
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w.Write([]byte("rate limited"))
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}),
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}
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handler := &RateLimitMiddleware{
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config: &config,
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buckets: make(map[string]*TokenBucket),
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next: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.Write([]byte("ok"))
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}),
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}
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// 消耗所有令牌
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for i := 0; i < 10; i++ {
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req := httptest.NewRequest("GET", "/test", nil)
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w := httptest.NewRecorder()
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handler.ServeHTTP(w, req)
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}
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// 第11个请求应该返回限流响应
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req := httptest.NewRequest("GET", "/test", nil)
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w := httptest.NewRecorder()
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handler.ServeHTTP(w, req)
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if w.Code != http.StatusTooManyRequests {
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t.Errorf("expected 429, got %d", w.Code)
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}
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t.Log("P0-05: 限流降级验证通过")
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}
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// TestP005_RateLimitConfig 验证限流配置
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func TestP005_RateLimitConfig(t *testing.T) {
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config := DefaultRateLimitConfig()
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if !config.Enabled {
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t.Error("rate limit should be enabled by default")
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}
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if config.Requests != 1000 {
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t.Errorf("expected default requests 1000, got %d", config.Requests)
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}
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if config.Window != time.Minute {
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t.Errorf("expected default window 1 minute, got %v", config.Window)
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}
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t.Log("P0-05: 限流配置验证通过")
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}
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// TestP005_Summary 测试总结
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func TestP005_Summary(t *testing.T) {
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t.Log("=== P0-05 限流策略测试总结 ===")
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t.Log("问题: PRD P0要求基础限流策略，但所有技术文档均未定义限流算法")
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t.Log("")
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t.Log("修复方案:")
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t.Log(" - 令牌桶算法 (Token Bucket)")
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t.Log(" - 多维度限流 (tenant/user/IP/endpoint)")
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t.Log(" - 滑动窗口 (Sliding Window)")
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t.Log(" - 降级策略 (返回429或队列)")
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}
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// ==================== TokenBucket Reset Tests ====================
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func TestTokenBucket_Reset(t *testing.T) {
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bucket := NewTokenBucket(5, 1) // capacity 5, refill 1/second
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// Consume some tokens
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for i := 0; i < 3; i++ {
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bucket.Allow()
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}
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// Verify tokens consumed
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if bucket.Remaining() != 2 {
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t.Errorf("expected 2 remaining after 3 allows, got %d", bucket.Remaining())
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}
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// Reset
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bucket.Reset()
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// Verify full capacity restored
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if bucket.Remaining() != 5 {
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t.Errorf("expected 5 remaining after reset, got %d", bucket.Remaining())
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}
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}
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// TestTokenBucket_RefillOverflow tests the refill logic when tokens exceed capacity
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func TestTokenBucket_RefillOverflow(t *testing.T) {
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bucket := NewTokenBucket(5, 100) // capacity 5, refill 100/second
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// Consume all tokens
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for i := 0; i < 5; i++ {
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bucket.Allow()
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}
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// Remaining should be 0
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if bucket.Remaining() != 0 {
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t.Errorf("expected 0 remaining, got %d", bucket.Remaining())
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}
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// Wait for refill - should get more than capacity
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time.Sleep(50 * time.Millisecond) // 100/second = 5 tokens in 50ms
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// Remaining should be capped at capacity (5)
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remaining := bucket.Remaining()
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if remaining != 5 {
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t.Errorf("expected 5 (capped at capacity), got %d", remaining)
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}
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}
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// TestGetBucket_NewBucketCreation tests bucket creation on first access
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func TestGetBucket_NewBucketCreation(t *testing.T) {
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config := &RateLimitConfig{
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Enabled: true,
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Requests: 50,
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Window: time.Minute,
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}
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rl := &RateLimitMiddleware{
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config: config,
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buckets: make(map[string]*TokenBucket),
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next: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}),
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}
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// First access - should create new bucket
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bucket1 := rl.getBucket("new-key")
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if bucket1 == nil {
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t.Fatal("expected non-nil bucket")
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}
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// Second access - should return same bucket
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bucket2 := rl.getBucket("new-key")
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if bucket1 != bucket2 {
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t.Error("expected same bucket for same key")
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}
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// Different key - should create new bucket
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bucket3 := rl.getBucket("different-key")
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if bucket3 == bucket1 {
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t.Error("expected different bucket for different key")
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}
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}
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// ==================== getRateLimitKey Tests ====================
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func TestGetRateLimitKey_Default(t *testing.T) {
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config := &RateLimitConfig{
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Enabled: true,
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Requests: 100,
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Window: time.Minute,
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// No LimitBy... set
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}
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rl := &RateLimitMiddleware{
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config: config,
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buckets: make(map[string]*TokenBucket),
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}
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req := httptest.NewRequest("GET", "/test", nil)
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key := rl.getRateLimitKey(req)
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if key != "default" {
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t.Errorf("expected 'default', got '%s'", key)
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}
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}
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func TestGetRateLimitKey_ByTenant(t *testing.T) {
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config := &RateLimitConfig{
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Enabled: true,
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Requests: 100,
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Window: time.Minute,
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LimitByTenant: true,
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}
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rl := &RateLimitMiddleware{
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config: config,
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buckets: make(map[string]*TokenBucket),
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}
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req := httptest.NewRequest("GET", "/test", nil)
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key := rl.getRateLimitKey(req)
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if key != "tenant:0" {
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t.Errorf("expected 'tenant:0', got '%s'", key)
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}
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}
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func TestGetRateLimitKey_ByUser(t *testing.T) {
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config := &RateLimitConfig{
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Enabled: true,
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Requests: 100,
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Window: time.Minute,
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LimitByUser: true,
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}
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rl := &RateLimitMiddleware{
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config: config,
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buckets: make(map[string]*TokenBucket),
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}
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|
|
|||
|
|
req := httptest.NewRequest("GET", "/test", nil)
|
|||
|
|
key := rl.getRateLimitKey(req)
|
|||
|
|
|
|||
|
|
if key != "user:unknown" {
|
|||
|
|
t.Errorf("expected 'user:unknown', got '%s'", key)
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
func TestGetRateLimitKey_ByIP(t *testing.T) {
|
|||
|
|
config := &RateLimitConfig{
|
|||
|
|
Enabled: true,
|
|||
|
|
Requests: 100,
|
|||
|
|
Window: time.Minute,
|
|||
|
|
LimitByIP: true,
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
rl := &RateLimitMiddleware{
|
|||
|
|
config: config,
|
|||
|
|
buckets: make(map[string]*TokenBucket),
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
req := httptest.NewRequest("GET", "/test", nil)
|
|||
|
|
key := rl.getRateLimitKey(req)
|
|||
|
|
|
|||
|
|
if key == "" {
|
|||
|
|
t.Error("expected non-empty key")
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
func TestGetRateLimitKey_ByEndpoint(t *testing.T) {
|
|||
|
|
config := &RateLimitConfig{
|
|||
|
|
Enabled: true,
|
|||
|
|
Requests: 100,
|
|||
|
|
Window: time.Minute,
|
|||
|
|
LimitByEndpoint: true,
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
rl := &RateLimitMiddleware{
|
|||
|
|
config: config,
|
|||
|
|
buckets: make(map[string]*TokenBucket),
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
req := httptest.NewRequest("GET", "/api/v1/test", nil)
|
|||
|
|
key := rl.getRateLimitKey(req)
|
|||
|
|
|
|||
|
|
if key != "/api/v1/test" {
|
|||
|
|
t.Errorf("expected '/api/v1/test', got '%s'", key)
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
func TestGetRateLimitKey_MultipleDimensions(t *testing.T) {
|
|||
|
|
config := &RateLimitConfig{
|
|||
|
|
Enabled: true,
|
|||
|
|
Requests: 100,
|
|||
|
|
Window: time.Minute,
|
|||
|
|
LimitByTenant: true,
|
|||
|
|
LimitByUser: true,
|
|||
|
|
LimitByIP: true,
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
rl := &RateLimitMiddleware{
|
|||
|
|
config: config,
|
|||
|
|
buckets: make(map[string]*TokenBucket),
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
req := httptest.NewRequest("GET", "/test", nil)
|
|||
|
|
key := rl.getRateLimitKey(req)
|
|||
|
|
|
|||
|
|
// Should contain multiple parts
|
|||
|
|
if key == "default" {
|
|||
|
|
t.Error("expected multi-part key")
|
|||
|
|
}
|
|||
|
|
if key == "" {
|
|||
|
|
t.Error("expected non-empty key")
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// ==================== handleRateLimitExceeded Tests ====================
|
|||
|
|
|
|||
|
|
func TestHandleRateLimitExceeded_FallbackCode(t *testing.T) {
|
|||
|
|
config := &RateLimitConfig{
|
|||
|
|
Enabled: true,
|
|||
|
|
Requests: 10,
|
|||
|
|
Window: time.Second,
|
|||
|
|
FallbackCode: http.StatusServiceUnavailable,
|
|||
|
|
// DegradationEnabled = false
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
rl := &RateLimitMiddleware{
|
|||
|
|
config: config,
|
|||
|
|
buckets: make(map[string]*TokenBucket),
|
|||
|
|
next: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|||
|
|
t.Error("next handler should not be called")
|
|||
|
|
}),
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
bucket := NewTokenBucket(10, 0)
|
|||
|
|
// Exhaust all tokens
|
|||
|
|
for i := 0; i < 10; i++ {
|
|||
|
|
bucket.Allow()
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
req := httptest.NewRequest("GET", "/test", nil)
|
|||
|
|
w := httptest.NewRecorder()
|
|||
|
|
|
|||
|
|
// Directly call handleRateLimitExceeded
|
|||
|
|
rl.handleRateLimitExceeded(w, req, bucket)
|
|||
|
|
|
|||
|
|
if w.Code != http.StatusServiceUnavailable {
|
|||
|
|
t.Errorf("expected status %d, got %d", http.StatusServiceUnavailable, w.Code)
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
func TestHandleRateLimitExceeded_WithoutDegradation(t *testing.T) {
|
|||
|
|
config := &RateLimitConfig{
|
|||
|
|
Enabled: true,
|
|||
|
|
Requests: 1,
|
|||
|
|
Window: time.Second,
|
|||
|
|
FallbackCode: http.StatusTooManyRequests,
|
|||
|
|
// DegradationEnabled = false by default
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
handler := &RateLimitMiddleware{
|
|||
|
|
config: config,
|
|||
|
|
buckets: make(map[string]*TokenBucket),
|
|||
|
|
next: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|||
|
|
w.WriteHeader(http.StatusOK)
|
|||
|
|
}),
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// First request should succeed
|
|||
|
|
req := httptest.NewRequest("GET", "/test", nil)
|
|||
|
|
w := httptest.NewRecorder()
|
|||
|
|
handler.ServeHTTP(w, req)
|
|||
|
|
|
|||
|
|
if w.Code != http.StatusOK {
|
|||
|
|
t.Errorf("first request: expected 200, got %d", w.Code)
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// Second request should be rate limited
|
|||
|
|
w = httptest.NewRecorder()
|
|||
|
|
handler.ServeHTTP(w, req)
|
|||
|
|
|
|||
|
|
if w.Code != http.StatusTooManyRequests {
|
|||
|
|
t.Errorf("second request: expected 429, got %d", w.Code)
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
func TestServeHTTP_Disabled(t *testing.T) {
|
|||
|
|
config := &RateLimitConfig{
|
|||
|
|
Enabled: false, // Disabled
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
nextCalled := false
|
|||
|
|
handler := &RateLimitMiddleware{
|
|||
|
|
config: config,
|
|||
|
|
buckets: make(map[string]*TokenBucket),
|
|||
|
|
next: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|||
|
|
nextCalled = true
|
|||
|
|
w.WriteHeader(http.StatusOK)
|
|||
|
|
}),
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
req := httptest.NewRequest("GET", "/test", nil)
|
|||
|
|
w := httptest.NewRecorder()
|
|||
|
|
handler.ServeHTTP(w, req)
|
|||
|
|
|
|||
|
|
if !nextCalled {
|
|||
|
|
t.Error("next handler should be called when rate limit is disabled")
|
|||
|
|
}
|
|||
|
|
}
|