mirror of https://github.com/aptly-dev/aptly
104 lines
3.3 KiB
Go
104 lines
3.3 KiB
Go
package api
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import (
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"fmt"
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"math"
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"strconv"
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"strings"
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"time"
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"github.com/gin-gonic/gin"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promauto"
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)
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var (
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apiRequestsInFlightGauge = promauto.NewGaugeVec(
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prometheus.GaugeOpts{
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Name: "aptly_api_http_requests_in_flight",
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Help: "Number of concurrent HTTP api requests currently handled.",
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},
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[]string{"method", "path"},
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)
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apiRequestsTotalCounter = promauto.NewCounterVec(
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prometheus.CounterOpts{
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Name: "aptly_api_http_requests_total",
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Help: "Total number of api requests.",
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},
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[]string{"code", "method", "path"},
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)
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apiRequestSizeSummary = promauto.NewSummaryVec(
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prometheus.SummaryOpts{
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Name: "aptly_api_http_request_size_bytes",
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Help: "Api HTTP request size in bytes.",
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},
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[]string{"code", "method", "path"},
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)
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apiResponseSizeSummary = promauto.NewSummaryVec(
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prometheus.SummaryOpts{
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Name: "aptly_api_http_response_size_bytes",
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Help: "Api HTTP response size in bytes.",
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},
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[]string{"code", "method", "path"},
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)
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apiRequestsDurationSummary = promauto.NewSummaryVec(
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prometheus.SummaryOpts{
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Name: "aptly_api_http_request_duration_seconds",
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Help: "Duration of api requests in seconds.",
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},
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[]string{"code", "method", "path"},
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)
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)
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// Only use base path as label value (e.g.: /api/repos) because of time series cardinality
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// See https://prometheus.io/docs/practices/naming/#labels
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func getBasePath(c *gin.Context) string {
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return fmt.Sprintf("%s%s", getURLSegment(c.Request.URL.Path, 0), getURLSegment(c.Request.URL.Path, 1))
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}
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func getURLSegment(url string, idx int) string {
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var urlSegments = strings.Split(url, "/")
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// Remove segment at index 0 because it's an empty string
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var segmentAtIndex = urlSegments[1:cap(urlSegments)][idx]
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return fmt.Sprintf("/%s", segmentAtIndex)
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}
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func instrumentHandlerInFlight(g *prometheus.GaugeVec, pathFunc func(*gin.Context) string) func(*gin.Context) {
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return func(c *gin.Context) {
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g.WithLabelValues(c.Request.Method, pathFunc(c)).Inc()
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defer g.WithLabelValues(c.Request.Method, pathFunc(c)).Dec()
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c.Next()
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}
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}
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func instrumentHandlerCounter(counter *prometheus.CounterVec, pathFunc func(*gin.Context) string) func(*gin.Context) {
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return func(c *gin.Context) {
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c.Next()
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counter.WithLabelValues(strconv.Itoa(c.Writer.Status()), c.Request.Method, pathFunc(c)).Inc()
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}
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}
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func instrumentHandlerRequestSize(obs prometheus.ObserverVec, pathFunc func(*gin.Context) string) func(*gin.Context) {
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return func(c *gin.Context) {
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c.Next()
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obs.WithLabelValues(strconv.Itoa(c.Writer.Status()), c.Request.Method, pathFunc(c)).Observe(float64(c.Request.ContentLength))
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}
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}
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func instrumentHandlerResponseSize(obs prometheus.ObserverVec, pathFunc func(*gin.Context) string) func(*gin.Context) {
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return func(c *gin.Context) {
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c.Next()
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var responseSize = math.Max(float64(c.Writer.Size()), 0)
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obs.WithLabelValues(strconv.Itoa(c.Writer.Status()), c.Request.Method, pathFunc(c)).Observe(responseSize)
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}
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}
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func instrumentHandlerDuration(obs prometheus.ObserverVec, pathFunc func(*gin.Context) string) func(*gin.Context) {
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return func(c *gin.Context) {
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now := time.Now()
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c.Next()
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obs.WithLabelValues(strconv.Itoa(c.Writer.Status()), c.Request.Method, pathFunc(c)).Observe(time.Since(now).Seconds())
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}
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}
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