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metrics.go
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metrics.go
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package bgs
import (
"errors"
"net/http"
"strconv"
"time"
"github.com/labstack/echo/v4"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
)
var eventsReceivedCounter = promauto.NewCounterVec(prometheus.CounterOpts{
Name: "events_received_counter",
Help: "The total number of events received",
}, []string{"pds"})
var eventsHandleDuration = promauto.NewHistogramVec(prometheus.HistogramOpts{
Name: "events_handle_duration",
Help: "A histogram of handleFedEvent latencies",
Buckets: prometheus.ExponentialBuckets(0.001, 2, 15),
}, []string{"pds"})
var repoCommitsReceivedCounter = promauto.NewCounterVec(prometheus.CounterOpts{
Name: "repo_commits_received_counter",
Help: "The total number of events received",
}, []string{"pds"})
var rebasesCounter = promauto.NewCounterVec(prometheus.CounterOpts{
Name: "event_rebases",
Help: "The total number of rebase events received",
}, []string{"pds"})
var eventsSentCounter = promauto.NewCounterVec(prometheus.CounterOpts{
Name: "events_sent_counter",
Help: "The total number of events sent to consumers",
}, []string{"remote_addr", "user_agent"})
var externalUserCreationAttempts = promauto.NewCounter(prometheus.CounterOpts{
Name: "bgs_external_user_creation_attempts",
Help: "The total number of external users created",
})
var compactionDuration = promauto.NewHistogram(prometheus.HistogramOpts{
Name: "compaction_duration",
Help: "A histogram of compaction latencies",
Buckets: prometheus.ExponentialBuckets(0.001, 3, 14),
})
var compactionQueueDepth = promauto.NewGauge(prometheus.GaugeOpts{
Name: "compaction_queue_depth",
Help: "The current depth of the compaction queue",
})
var newUsersDiscovered = promauto.NewCounter(prometheus.CounterOpts{
Name: "bgs_new_users_discovered",
Help: "The total number of new users discovered directly from the firehose (not from refs)",
})
var reqSz = promauto.NewHistogramVec(prometheus.HistogramOpts{
Name: "http_request_size_bytes",
Help: "A histogram of request sizes for requests.",
Buckets: prometheus.ExponentialBuckets(100, 10, 8),
}, []string{"code", "method", "path"})
var reqDur = promauto.NewHistogramVec(prometheus.HistogramOpts{
Name: "http_request_duration_seconds",
Help: "A histogram of latencies for requests.",
Buckets: prometheus.ExponentialBuckets(0.001, 2, 15),
}, []string{"code", "method", "path"})
var reqCnt = promauto.NewCounterVec(prometheus.CounterOpts{
Name: "http_requests_total",
Help: "A counter for requests to the wrapped handler.",
}, []string{"code", "method", "path"})
var resSz = promauto.NewHistogramVec(prometheus.HistogramOpts{
Name: "http_response_size_bytes",
Help: "A histogram of response sizes for requests.",
Buckets: prometheus.ExponentialBuckets(100, 10, 8),
}, []string{"code", "method", "path"})
// MetricsMiddleware defines handler function for metrics middleware
func MetricsMiddleware(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
path := c.Path()
if path == "/metrics" || path == "/_health" {
return next(c)
}
start := time.Now()
requestSize := computeApproximateRequestSize(c.Request())
err := next(c)
status := c.Response().Status
if err != nil {
var httpError *echo.HTTPError
if errors.As(err, &httpError) {
status = httpError.Code
}
if status == 0 || status == http.StatusOK {
status = http.StatusInternalServerError
}
}
elapsed := float64(time.Since(start)) / float64(time.Second)
statusStr := strconv.Itoa(status)
method := c.Request().Method
responseSize := float64(c.Response().Size)
reqDur.WithLabelValues(statusStr, method, path).Observe(elapsed)
reqCnt.WithLabelValues(statusStr, method, path).Inc()
reqSz.WithLabelValues(statusStr, method, path).Observe(float64(requestSize))
resSz.WithLabelValues(statusStr, method, path).Observe(responseSize)
return err
}
}
func computeApproximateRequestSize(r *http.Request) int {
s := 0
if r.URL != nil {
s = len(r.URL.Path)
}
s += len(r.Method)
s += len(r.Proto)
for name, values := range r.Header {
s += len(name)
for _, value := range values {
s += len(value)
}
}
s += len(r.Host)
// N.B. r.Form and r.MultipartForm are assumed to be included in r.URL.
if r.ContentLength != -1 {
s += int(r.ContentLength)
}
return s
}