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Add host to metric middlewares

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This commit is contained in:
Melon 2024-02-21 11:44:51 +00:00
parent e901a73129
commit a13db89c44
Signed by: melon
GPG Key ID: 6C9D970C50D26A25
2 changed files with 24 additions and 5 deletions
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5
servers/https.go
View File

@ -27,9 +27,12 @@ func NewHttpsServer(conf *conf.Conf, registry *prometheus.Registry) *http.Server
favMiddleware := setupFaviconMiddleware(conf.Favicons, r)
rateLimiter := setupRateLimiter(conf.RateLimit, favMiddleware)
metricsMiddleware := metrics.New(registry, nil).WrapHandler("violet-https", rateLimiter)
metricsMeta := http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
metricsMiddleware.ServeHTTP(rw, metrics.AddHostCtx(req))
})
hsts := http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
rw.Header().Set("Strict-Transport-Security", "max-age=63072000; includeSubDomains")
metricsMiddleware.ServeHTTP(rw, req)
metricsMeta.ServeHTTP(rw, req)
})
return &http.Server{

24
servers/metrics/httpmiddleware.go
View File

@ -1,6 +1,7 @@
package metrics
import (
"context"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/prometheus/client_golang/prometheus/promhttp"
@ -46,7 +47,7 @@ func (m *middleware) WrapHandler(handlerName string, handler http.Handler) http.
prometheus.CounterOpts{
Name: "http_requests_total",
Help: "Tracks the number of HTTP requests.",
}, []string{"method", "code"},
}, []string{"method", "code", "host"},
)
requestDuration := promauto.With(reg).NewHistogramVec(
prometheus.HistogramOpts{
@ -54,23 +55,28 @@ func (m *middleware) WrapHandler(handlerName string, handler http.Handler) http.
Help: "Tracks the latencies for HTTP requests.",
Buckets: m.buckets,
},
[]string{"method", "code"},
[]string{"method", "code", "host"},
)
requestSize := promauto.With(reg).NewSummaryVec(
prometheus.SummaryOpts{
Name: "http_request_size_bytes",
Help: "Tracks the size of HTTP requests.",
},
[]string{"method", "code"},
[]string{"method", "code", "host"},
)
responseSize := promauto.With(reg).NewSummaryVec(
prometheus.SummaryOpts{
Name: "http_response_size_bytes",
Help: "Tracks the size of HTTP responses.",
},
[]string{"method", "code"},
[]string{"method", "code", "host"},
)
hostCtxGetter := promhttp.WithLabelFromCtx("host", func(ctx context.Context) string {
s, _ := ctx.Value(hostCtxKey(0)).(string)
return s
})
// Wraps the provided http.Handler to observe the request result with the provided metrics.
base := promhttp.InstrumentHandlerCounter(
requestsTotal,
@ -81,9 +87,13 @@ func (m *middleware) WrapHandler(handlerName string, handler http.Handler) http.
promhttp.InstrumentHandlerResponseSize(
responseSize,
handler,
hostCtxGetter,
),
hostCtxGetter,
),
hostCtxGetter,
),
hostCtxGetter,
)
return base.ServeHTTP
@ -100,3 +110,9 @@ func New(registry prometheus.Registerer, buckets []float64) Middleware {
registry: registry,
}
}
type hostCtxKey uint8
func AddHostCtx(req *http.Request) *http.Request {
return req.WithContext(context.WithValue(req.Context(), hostCtxKey(0), req.Host))
}