prometheus/web/federate.go

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// Copyright 2015 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package web
import (
"net/http"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/expfmt"
"github.com/prometheus/common/model"
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"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/promql"
)
var (
federationErrors = prometheus.NewCounter(prometheus.CounterOpts{
Name: "prometheus_web_federation_errors_total",
Help: "Total number of errors that occurred while sending federation responses.",
})
)
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func (h *Handler) federation(w http.ResponseWriter, req *http.Request) {
h.mtx.RLock()
defer h.mtx.RUnlock()
req.ParseForm()
var matcherSets [][]*labels.Matcher
for _, s := range req.Form["match[]"] {
matchers, err := promql.ParseMetricSelector(s)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
matcherSets = append(matcherSets, matchers)
}
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var (
// minTimestamp = h.now().Add(-promql.StalenessDelta)
format = expfmt.Negotiate(req.Header)
// enc = expfmt.NewEncoder(w, format)
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)
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w.Header().Set("Content-Type", string(format))
federationErrors.Inc()
http.Error(w, errors.Errorf("federation disabled").Error(), http.StatusInternalServerError)
return
// q, err := h.storage.Querier()
// if err != nil {
// federationErrors.Inc()
// http.Error(w, err.Error(), http.StatusInternalServerError)
// return
// }
// defer q.Close()
// TODO(fabxc): support via TSDB storage.
// var sets []tsdb.SeriesSet
// for _, matchers := range matcherSets {
// set, err := q.Select(matchers)
// sets = append(sets, set)
// }
// vector, err := q.LastSampleForLabelMatchers(h.context, minTimestamp, matcherSets...)
// if err != nil {
// federationErrors.Inc()
// http.Error(w, err.Error(), http.StatusInternalServerError)
// return
// }
// sort.Sort(byName(vector))
// var (
// lastMetricName model.LabelValue
// protMetricFam *dto.MetricFamily
// )
// for _, s := range vector {
// nameSeen := false
// globalUsed := map[model.LabelName]struct{}{}
// protMetric := &dto.Metric{
// Untyped: &dto.Untyped{},
// }
// for ln, lv := range s.Metric {
// if lv == "" {
// // No value means unset. Never consider those labels.
// // This is also important to protect against nameless metrics.
// continue
// }
// if ln == model.MetricNameLabel {
// nameSeen = true
// if lv == lastMetricName {
// // We already have the name in the current MetricFamily,
// // and we ignore nameless metrics.
// continue
// }
// // Need to start a new MetricFamily. Ship off the old one (if any) before
// // creating the new one.
// if protMetricFam != nil {
// if err := enc.Encode(protMetricFam); err != nil {
// federationErrors.Inc()
// log.With("err", err).Error("federation failed")
// return
// }
// }
// protMetricFam = &dto.MetricFamily{
// Type: dto.MetricType_UNTYPED.Enum(),
// Name: proto.String(string(lv)),
// }
// lastMetricName = lv
// continue
// }
// protMetric.Label = append(protMetric.Label, &dto.LabelPair{
// Name: proto.String(string(ln)),
// Value: proto.String(string(lv)),
// })
// if _, ok := h.externalLabels[ln]; ok {
// globalUsed[ln] = struct{}{}
// }
// }
// if !nameSeen {
// log.With("metric", s.Metric).Warn("Ignoring nameless metric during federation.")
// continue
// }
// // Attach global labels if they do not exist yet.
// for ln, lv := range h.externalLabels {
// if _, ok := globalUsed[ln]; !ok {
// protMetric.Label = append(protMetric.Label, &dto.LabelPair{
// Name: proto.String(string(ln)),
// Value: proto.String(string(lv)),
// })
// }
// }
// protMetric.TimestampMs = proto.Int64(int64(s.Timestamp))
// protMetric.Untyped.Value = proto.Float64(float64(s.Value))
// protMetricFam.Metric = append(protMetricFam.Metric, protMetric)
// }
// // Still have to ship off the last MetricFamily, if any.
// if protMetricFam != nil {
// if err := enc.Encode(protMetricFam); err != nil {
// federationErrors.Inc()
// log.With("err", err).Error("federation failed")
// }
// }
}
// byName makes a model.Vector sortable by metric name.
type byName model.Vector
func (vec byName) Len() int { return len(vec) }
func (vec byName) Swap(i, j int) { vec[i], vec[j] = vec[j], vec[i] }
func (vec byName) Less(i, j int) bool {
ni := vec[i].Metric[model.MetricNameLabel]
nj := vec[j].Metric[model.MetricNameLabel]
return ni < nj
}