109 lines
2.9 KiB
Go
109 lines
2.9 KiB
Go
|
package web
|
||
|
|
|
||
|
|
import (
|
||
|
|
"io"
|
||
|
|
"net/http"
|
||
|
|
|
||
|
|
"bitbucket.org/ww/goautoneg"
|
||
|
|
"github.com/golang/protobuf/proto"
|
||
|
|
"github.com/prometheus/client_golang/prometheus"
|
||
|
|
"github.com/prometheus/client_golang/text"
|
||
|
|
|
||
|
|
"github.com/prometheus/prometheus/promql"
|
||
|
|
"github.com/prometheus/prometheus/storage/local"
|
||
|
|
|
||
|
|
clientmodel "github.com/prometheus/client_golang/model"
|
||
|
|
dto "github.com/prometheus/client_model/go"
|
||
|
|
)
|
||
|
|
|
||
|
|
type Federation struct {
|
||
|
|
Storage local.Storage
|
||
|
|
}
|
||
|
|
|
||
|
|
func (fed *Federation) ServeHTTP(w http.ResponseWriter, req *http.Request) {
|
||
|
|
req.ParseForm()
|
||
|
|
|
||
|
|
metrics := map[clientmodel.Fingerprint]clientmodel.COWMetric{}
|
||
|
|
|
||
|
|
for _, s := range req.Form["match[]"] {
|
||
|
|
matchers, err := promql.ParseMetricSelector(s)
|
||
|
|
if err != nil {
|
||
|
|
http.Error(w, err.Error(), http.StatusBadRequest)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
for fp, met := range fed.Storage.MetricsForLabelMatchers(matchers...) {
|
||
|
|
metrics[fp] = met
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
enc, contentType := chooseEncoder(req)
|
||
|
|
w.Header().Set("Content-Type", contentType)
|
||
|
|
|
||
|
|
protMetric := &dto.Metric{
|
||
|
|
Label: []*dto.LabelPair{},
|
||
|
|
Untyped: &dto.Untyped{},
|
||
|
|
}
|
||
|
|
protMetricFam := &dto.MetricFamily{
|
||
|
|
Metric: []*dto.Metric{protMetric},
|
||
|
|
Type: dto.MetricType_UNTYPED.Enum(),
|
||
|
|
}
|
||
|
|
|
||
|
|
for fp, met := range metrics {
|
||
|
|
sp := fed.Storage.LastSamplePairForFingerprint(fp)
|
||
|
|
if sp == nil {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
// Reset label slice.
|
||
|
|
protMetric.Label = protMetric.Label[:0]
|
||
|
|
|
||
|
|
for ln, lv := range met.Metric {
|
||
|
|
if ln == clientmodel.MetricNameLabel {
|
||
|
|
protMetricFam.Name = proto.String(string(lv))
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
protMetric.Label = append(protMetric.Label, &dto.LabelPair{
|
||
|
|
Name: proto.String(string(ln)),
|
||
|
|
Value: proto.String(string(lv)),
|
||
|
|
})
|
||
|
|
}
|
||
|
|
protMetric.TimestampMs = (*int64)(&sp.Timestamp)
|
||
|
|
protMetric.Untyped.Value = (*float64)(&sp.Value)
|
||
|
|
|
||
|
|
if _, err := enc(w, protMetricFam); err != nil {
|
||
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
type encoder func(w io.Writer, p *dto.MetricFamily) (int, error)
|
||
|
|
|
||
|
|
func chooseEncoder(req *http.Request) (encoder, string) {
|
||
|
|
accepts := goautoneg.ParseAccept(req.Header.Get("Accept"))
|
||
|
|
for _, accept := range accepts {
|
||
|
|
switch {
|
||
|
|
case accept.Type == "application" &&
|
||
|
|
accept.SubType == "vnd.google.protobuf" &&
|
||
|
|
accept.Params["proto"] == "io.prometheus.client.MetricFamily":
|
||
|
|
switch accept.Params["encoding"] {
|
||
|
|
case "delimited":
|
||
|
|
return text.WriteProtoDelimited, prometheus.DelimitedTelemetryContentType
|
||
|
|
case "text":
|
||
|
|
return text.WriteProtoText, prometheus.ProtoTextTelemetryContentType
|
||
|
|
case "compact-text":
|
||
|
|
return text.WriteProtoCompactText, prometheus.ProtoCompactTextTelemetryContentType
|
||
|
|
default:
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
case accept.Type == "text" &&
|
||
|
|
accept.SubType == "plain" &&
|
||
|
|
(accept.Params["version"] == "0.0.4" || accept.Params["version"] == ""):
|
||
|
|
return text.MetricFamilyToText, prometheus.TextTelemetryContentType
|
||
|
|
default:
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return text.MetricFamilyToText, prometheus.TextTelemetryContentType
|
||
|
|
}
|