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| 1 | +package error_injection |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "mocks3/shared/client" |
| 6 | + "mocks3/shared/observability" |
| 7 | + "sync" |
| 8 | + "time" |
| 9 | +) |
| 10 | + |
| 11 | +// HTTPLatencyInjector HTTP请求延迟注入器 |
| 12 | +type HTTPLatencyInjector struct { |
| 13 | + mockErrorClient *client.BaseHTTPClient |
| 14 | + serviceName string |
| 15 | + serviceVersion string |
| 16 | + logger *observability.Logger |
| 17 | + |
| 18 | + // 缓存 |
| 19 | + cache map[string]*CachedLatencyConfig |
| 20 | + cacheMu sync.RWMutex |
| 21 | + cacheTTL time.Duration |
| 22 | +} |
| 23 | + |
| 24 | +// CachedLatencyConfig 缓存的延迟配置 |
| 25 | +type CachedLatencyConfig struct { |
| 26 | + Config *LatencyConfig |
| 27 | + ExpiresAt time.Time |
| 28 | +} |
| 29 | + |
| 30 | +// LatencyConfig 延迟配置 |
| 31 | +type LatencyConfig struct { |
| 32 | + ShouldInject bool `json:"should_inject"` |
| 33 | + Latency time.Duration `json:"latency"` // 注入的延迟时间 |
| 34 | + Probability float64 `json:"probability"` // 注入概率 (0-1) |
| 35 | + Pattern string `json:"pattern"` // 路径匹配模式（可选） |
| 36 | +} |
| 37 | + |
| 38 | +// NewHTTPLatencyInjector 创建HTTP延迟注入器 |
| 39 | +func NewHTTPLatencyInjector(mockErrorServiceURL string, serviceName, serviceVersion string, logger *observability.Logger) *HTTPLatencyInjector { |
| 40 | + client := client.NewBaseHTTPClient(mockErrorServiceURL, 5*time.Second, "latency-injector", logger) |
| 41 | + |
| 42 | + injector := &HTTPLatencyInjector{ |
| 43 | + mockErrorClient: client, |
| 44 | + serviceName: serviceName, |
| 45 | + serviceVersion: serviceVersion, |
| 46 | + logger: logger, |
| 47 | + cache: make(map[string]*CachedLatencyConfig), |
| 48 | + cacheTTL: 30 * time.Second, |
| 49 | + } |
| 50 | + |
| 51 | + // 启动缓存清理 |
| 52 | + go injector.cleanupCache() |
| 53 | + |
| 54 | + return injector |
| 55 | +} |
| 56 | + |
| 57 | +// GetLatencyConfig 获取延迟配置 |
| 58 | +func (h *HTTPLatencyInjector) GetLatencyConfig(ctx context.Context, path string) (*LatencyConfig, error) { |
| 59 | + // 构建缓存键（基于版本） |
| 60 | + cacheKey := h.serviceName + ":" + h.serviceVersion + ":" + path |
| 61 | + |
| 62 | + // 检查缓存 |
| 63 | + h.cacheMu.RLock() |
| 64 | + if cached, exists := h.cache[cacheKey]; exists && time.Now().Before(cached.ExpiresAt) { |
| 65 | + h.cacheMu.RUnlock() |
| 66 | + return cached.Config, nil |
| 67 | + } |
| 68 | + h.cacheMu.RUnlock() |
| 69 | + |
| 70 | + // 查询Mock Error Service获取延迟配置 |
| 71 | + request := map[string]string{ |
| 72 | + "service": h.serviceName, |
| 73 | + "version": h.serviceVersion, |
| 74 | + "path": path, |
| 75 | + "type": "http_latency", |
| 76 | + } |
| 77 | + |
| 78 | + var response struct { |
| 79 | + ShouldInject bool `json:"should_inject"` |
| 80 | + Latency int64 `json:"latency_ms"` // 毫秒 |
| 81 | + Probability float64 `json:"probability"` |
| 82 | + Pattern string `json:"pattern"` |
| 83 | + } |
| 84 | + |
| 85 | + opts := client.RequestOptions{ |
| 86 | + Method: "POST", |
| 87 | + Path: "/api/v1/latency-inject/check", |
| 88 | + Body: request, |
| 89 | + } |
| 90 | + |
| 91 | + err := h.mockErrorClient.DoRequestWithJSON(ctx, opts, &response) |
| 92 | + if err != nil { |
| 93 | + h.logger.Debug(ctx, "Failed to check latency injection", |
| 94 | + observability.Error(err), |
| 95 | + observability.String("path", path)) |
| 96 | + // 失败时缓存空结果 |
| 97 | + h.updateCache(cacheKey, nil) |
| 98 | + return nil, nil |
| 99 | + } |
| 100 | + |
| 101 | + // 构建配置 |
| 102 | + var config *LatencyConfig |
| 103 | + if response.ShouldInject { |
| 104 | + config = &LatencyConfig{ |
| 105 | + ShouldInject: true, |
| 106 | + Latency: time.Duration(response.Latency) * time.Millisecond, |
| 107 | + Probability: response.Probability, |
| 108 | + Pattern: response.Pattern, |
| 109 | + } |
| 110 | + } |
| 111 | + |
| 112 | + // 更新缓存 |
| 113 | + h.updateCache(cacheKey, config) |
| 114 | + |
| 115 | + return config, nil |
| 116 | +} |
| 117 | + |
| 118 | +// InjectLatency 注入延迟（如果需要） |
| 119 | +func (h *HTTPLatencyInjector) InjectLatency(ctx context.Context, path string) time.Duration { |
| 120 | + config, err := h.GetLatencyConfig(ctx, path) |
| 121 | + if err != nil || config == nil || !config.ShouldInject { |
| 122 | + return 0 |
| 123 | + } |
| 124 | + |
| 125 | + // 基于概率决定是否注入 |
| 126 | + if config.Probability < 1.0 { |
| 127 | + // 简单的概率实现（生产环境应使用更好的随机数） |
| 128 | + if time.Now().UnixNano()%100 >= int64(config.Probability*100) { |
| 129 | + return 0 |
| 130 | + } |
| 131 | + } |
| 132 | + |
| 133 | + // 执行真实的延迟 |
| 134 | + if config.Latency > 0 { |
| 135 | + h.logger.Info(ctx, "Injecting HTTP latency", |
| 136 | + observability.String("service", h.serviceName), |
| 137 | + observability.String("version", h.serviceVersion), |
| 138 | + observability.String("path", path), |
| 139 | + observability.Duration("latency", config.Latency)) |
| 140 | + |
| 141 | + // 真实的延迟注入 |
| 142 | + time.Sleep(config.Latency) |
| 143 | + |
| 144 | + return config.Latency |
| 145 | + } |
| 146 | + |
| 147 | + return 0 |
| 148 | +} |
| 149 | + |
| 150 | +// updateCache 更新缓存 |
| 151 | +func (h *HTTPLatencyInjector) updateCache(key string, config *LatencyConfig) { |
| 152 | + h.cacheMu.Lock() |
| 153 | + defer h.cacheMu.Unlock() |
| 154 | + |
| 155 | + h.cache[key] = &CachedLatencyConfig{ |
| 156 | + Config: config, |
| 157 | + ExpiresAt: time.Now().Add(h.cacheTTL), |
| 158 | + } |
| 159 | +} |
| 160 | + |
| 161 | +// cleanupCache 定期清理过期缓存 |
| 162 | +func (h *HTTPLatencyInjector) cleanupCache() { |
| 163 | + ticker := time.NewTicker(1 * time.Minute) |
| 164 | + defer ticker.Stop() |
| 165 | + |
| 166 | + for range ticker.C { |
| 167 | + h.cacheMu.Lock() |
| 168 | + now := time.Now() |
| 169 | + for key, cached := range h.cache { |
| 170 | + if now.After(cached.ExpiresAt) { |
| 171 | + delete(h.cache, key) |
| 172 | + } |
| 173 | + } |
| 174 | + h.cacheMu.Unlock() |
| 175 | + } |
| 176 | +} |
| 177 | + |
| 178 | +// Cleanup 清理资源 |
| 179 | +func (h *HTTPLatencyInjector) Cleanup() { |
| 180 | + h.cacheMu.Lock() |
| 181 | + defer h.cacheMu.Unlock() |
| 182 | + h.cache = make(map[string]*CachedLatencyConfig) |
| 183 | +} |
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