evcc-io/util/request/roundtrip.go
2021-08-21 12:53:25 +02:00

99 lines
2.2 KiB
Go

package request
import (
"bytes"
"net/http"
"net/http/httputil"
"strconv"
"strings"
"time"
"github.com/evcc-io/evcc/util"
"github.com/prometheus/client_golang/prometheus"
)
type roundTripper struct {
log *util.Logger
base http.RoundTripper
}
const max = 1024 * 64
var (
reqMetric *prometheus.SummaryVec
resMetric *prometheus.CounterVec
)
func init() {
labels := []string{"host"}
reqMetric = prometheus.NewSummaryVec(prometheus.SummaryOpts{
Namespace: "evcc",
Subsystem: "http",
Name: "request_duration_seconds",
Help: "A summary of HTTP request durations",
Objectives: map[float64]float64{
0.5: 0.05, // 50th percentile with a max. absolute error of 0.05
0.9: 0.01, // 90th percentile with a max. absolute error of 0.01
0.99: 0.001, // 99th percentile with a max. absolute error of 0.001
},
}, labels)
resMetric = prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: "evcc",
Subsystem: "http",
Name: "request_total",
Help: "Total count of HTTP requests",
}, append(labels, "status"))
prometheus.MustRegister(reqMetric, resMetric)
}
// NewTripper creates a logging roundtrip handler
func NewTripper(log *util.Logger, base http.RoundTripper) http.RoundTripper {
tripper := &roundTripper{
log: log,
base: base,
}
return tripper
}
func min(a, b int) int {
if a < b {
return a
}
return b
}
func (r *roundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
r.log.TRACE.Printf("%s %s", req.Method, req.URL.String())
var bld strings.Builder
if body, err := httputil.DumpRequestOut(req, true); err == nil {
bld.WriteString("\n")
bld.Write(bytes.TrimSpace(body[:min(max, len(body))]))
}
startTime := time.Now()
resp, err := r.base.RoundTrip(req)
reqMetric.WithLabelValues(req.URL.Hostname()).Observe(time.Since(startTime).Seconds())
if err == nil {
resMetric.WithLabelValues(req.URL.Hostname(), strconv.Itoa(resp.StatusCode)).Add(1)
if body, err := httputil.DumpResponse(resp, true); err == nil {
bld.WriteString("\n\n")
bld.Write(bytes.TrimSpace(body[:min(max, len(body))]))
}
} else {
resMetric.WithLabelValues(req.URL.Hostname(), "999").Add(1)
}
if bld.Len() > 0 {
r.log.TRACE.Println(bld.String())
}
return resp, err
}