Jeffrey Smith
ed3e9363f2
Co-authored-by: Jeffrey Smith <jasafpro@gmail.com> Co-committed-by: Jeffrey Smith <jasafpro@gmail.com>
31 lines
753 B
Go
31 lines
753 B
Go
package middleware
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import (
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"strconv"
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"time"
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"github.com/gin-gonic/gin"
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"chat-switchboard/metrics"
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)
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// Prometheus returns a Gin middleware that records HTTP request metrics.
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// Uses c.FullPath() (Gin's registered route pattern, e.g.
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// "/api/v1/channels/:id") to avoid label cardinality explosion from
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// path parameters.
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func Prometheus() gin.HandlerFunc {
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return func(c *gin.Context) {
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start := time.Now()
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c.Next()
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pattern := c.FullPath()
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if pattern == "" {
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pattern = "unmatched"
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}
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status := strconv.Itoa(c.Writer.Status())
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metrics.HTTPRequestsTotal.WithLabelValues(c.Request.Method, pattern, status).Inc()
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metrics.HTTPRequestDuration.WithLabelValues(c.Request.Method, pattern).Observe(time.Since(start).Seconds())
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}
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}
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