Method Middleware

server/observability/metrics.go:127–163

Middleware Prometheus 中间件

()

// Middleware Prometheus 中间件
func (m *MetricsManager) Middleware() gin.HandlerFunc {
	return func(c *gin.Context) {
		start := time.Now()
		path := c.FullPath()
		if path == "" {
			path = c.Request.URL.Path
		}

		// 记录请求大小
		reqSize := computeRequestSize(c)
		m.requestSize.WithLabelValues(c.Request.Method, path).Observe(float64(reqSize))

		// 处理请求
		c.Next()

		// 记录指标
		duration := time.Since(start).Seconds()
		status := c.Writer.Status()

		m.requestsTotal.WithLabelValues(
			c.Request.Method,
			path,
			statusClass(status),
		).Inc()

		m.requestDuration.WithLabelValues(
			c.Request.Method,
			path,
		).Observe(duration)

		// 记录响应大小
		respSize := c.Writer.Size()
		if respSize > 0 {
			m.responseSize.WithLabelValues(c.Request.Method, path).Observe(float64(respSize))
		}
	}
}

// Handler Prometheus 指标暴露端点
func (m *MetricsManager) Handler() gin.HandlerFunc {