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package httptransport
import (
"context"
"net/http"
"net/http/httptrace"
"strconv"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/sirupsen/logrus"
"gitlab.com/gitlab-org/gitlab-pages/internal/logging"
)
type meteredRoundTripper struct {
next http.RoundTripper
name string
tracer *prometheus.HistogramVec
durations *prometheus.HistogramVec
counter *prometheus.CounterVec
ttfbTimeout time.Duration
}
// NewMeteredRoundTripper will create a custom http.RoundTripper that can be used with an http.Client.
// The RoundTripper will report metrics based on the collectors passed.
func NewMeteredRoundTripper(transport http.RoundTripper, name string, tracerVec, durationsVec *prometheus.
HistogramVec, counterVec *prometheus.CounterVec, ttfbTimeout time.Duration) http.RoundTripper {
if transport == nil {
transport = DefaultTransport
}
return &meteredRoundTripper{
next: transport,
name: name,
tracer: tracerVec,
durations: durationsVec,
counter: counterVec,
ttfbTimeout: ttfbTimeout,
}
}
// RoundTrip wraps the original http.Transport into a meteredRoundTripper which
// reports metrics on request duration, tracing and request count
func (mrt *meteredRoundTripper) RoundTrip(r *http.Request) (*http.Response, error) {
start := time.Now()
ctx := httptrace.WithClientTrace(r.Context(), mrt.newTracer(start))
ctx, cancel := context.WithCancel(ctx)
timer := time.AfterFunc(mrt.ttfbTimeout, cancel)
defer timer.Stop()
r = r.WithContext(ctx)
resp, err := mrt.next.RoundTrip(r)
if err != nil {
mrt.counter.WithLabelValues("error").Inc()
return nil, err
}
mrt.logResponse(r, resp)
statusCode := strconv.Itoa(resp.StatusCode)
mrt.durations.WithLabelValues(statusCode).Observe(time.Since(start).Seconds())
mrt.counter.WithLabelValues(statusCode).Inc()
return resp, nil
}
func (mrt *meteredRoundTripper) logResponse(req *http.Request, resp *http.Response) {
if logrus.GetLevel() == logrus.TraceLevel {
logging.LogRequest(req).WithFields(logrus.Fields{
"client_name": mrt.name,
"req_url": req.URL.String(),
"res_status_code": resp.StatusCode,
"res_headers": resp.Header,
}).Traceln("response from client")
}
}
// RegisterProtocol allows to call RegisterProtocol on the meteredRoundTripper's transport
// outside of this package
func (mrt *meteredRoundTripper) RegisterProtocol(scheme string, rt http.RoundTripper) {
mrt.next.(*http.Transport).RegisterProtocol(scheme, rt)
}
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