mirror of
https://github.com/prometheus/prometheus.git
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3bfec97d46
See discussion in https://groups.google.com/forum/#!topic/prometheus-developers/bkuGbVlvQ9g The main idea is that the user of a storage shouldn't have to deal with fingerprints anymore, and should not need to do an individual preload call for each metric. The storage interface needs to be made more high-level to not expose these details. This also makes it easier to reuse the same storage interface for remote storages later, as fewer roundtrips are required and the fingerprint concept doesn't work well across the network. NOTE: this deliberately gets rid of a small optimization in the old query Analyzer, where we dedupe instants and ranges for the same series. This should have a minor impact, as most queries do not have multiple selectors loading the same series (and at the same offset).
104 lines
2.8 KiB
Go
104 lines
2.8 KiB
Go
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package web
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import (
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"net/http"
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"github.com/golang/protobuf/proto"
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dto "github.com/prometheus/client_model/go"
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"github.com/prometheus/common/expfmt"
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"github.com/prometheus/common/model"
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"github.com/prometheus/prometheus/promql"
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"github.com/prometheus/prometheus/storage/metric"
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)
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func (h *Handler) federation(w http.ResponseWriter, req *http.Request) {
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h.mtx.RLock()
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defer h.mtx.RUnlock()
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req.ParseForm()
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var matcherSets []metric.LabelMatchers
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for _, s := range req.Form["match[]"] {
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matchers, err := promql.ParseMetricSelector(s)
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if err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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matcherSets = append(matcherSets, matchers)
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}
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var (
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minTimestamp = model.Now().Add(-promql.StalenessDelta)
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format = expfmt.Negotiate(req.Header)
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enc = expfmt.NewEncoder(w, format)
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)
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w.Header().Set("Content-Type", string(format))
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protMetric := &dto.Metric{
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Label: []*dto.LabelPair{},
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Untyped: &dto.Untyped{},
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}
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protMetricFam := &dto.MetricFamily{
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Metric: []*dto.Metric{protMetric},
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Type: dto.MetricType_UNTYPED.Enum(),
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}
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vector, err := h.storage.LastSampleForLabelMatchers(minTimestamp, matcherSets...)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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for _, s := range vector {
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globalUsed := map[model.LabelName]struct{}{}
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// Reset label slice.
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protMetric.Label = protMetric.Label[:0]
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for ln, lv := range s.Metric {
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if ln == model.MetricNameLabel {
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protMetricFam.Name = proto.String(string(lv))
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continue
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}
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protMetric.Label = append(protMetric.Label, &dto.LabelPair{
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Name: proto.String(string(ln)),
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Value: proto.String(string(lv)),
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})
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if _, ok := h.externalLabels[ln]; ok {
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globalUsed[ln] = struct{}{}
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}
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}
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// Attach global labels if they do not exist yet.
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for ln, lv := range h.externalLabels {
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if _, ok := globalUsed[ln]; !ok {
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protMetric.Label = append(protMetric.Label, &dto.LabelPair{
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Name: proto.String(string(ln)),
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Value: proto.String(string(lv)),
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})
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}
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}
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protMetric.TimestampMs = proto.Int64(int64(s.Timestamp))
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protMetric.Untyped.Value = proto.Float64(float64(s.Value))
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if err := enc.Encode(protMetricFam); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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}
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}
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