mirror of https://github.com/prometheus/prometheus
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
103 lines
2.8 KiB
103 lines
2.8 KiB
// 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/golang/protobuf/proto" |
|
dto "github.com/prometheus/client_model/go" |
|
"github.com/prometheus/common/expfmt" |
|
"github.com/prometheus/common/model" |
|
|
|
"github.com/prometheus/prometheus/promql" |
|
"github.com/prometheus/prometheus/storage/metric" |
|
) |
|
|
|
func (h *Handler) federation(w http.ResponseWriter, req *http.Request) { |
|
h.mtx.RLock() |
|
defer h.mtx.RUnlock() |
|
|
|
req.ParseForm() |
|
|
|
var matcherSets []metric.LabelMatchers |
|
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) |
|
} |
|
|
|
var ( |
|
minTimestamp = model.Now().Add(-promql.StalenessDelta) |
|
format = expfmt.Negotiate(req.Header) |
|
enc = expfmt.NewEncoder(w, format) |
|
) |
|
w.Header().Set("Content-Type", string(format)) |
|
|
|
protMetric := &dto.Metric{ |
|
Label: []*dto.LabelPair{}, |
|
Untyped: &dto.Untyped{}, |
|
} |
|
protMetricFam := &dto.MetricFamily{ |
|
Metric: []*dto.Metric{protMetric}, |
|
Type: dto.MetricType_UNTYPED.Enum(), |
|
} |
|
|
|
vector, err := h.storage.LastSampleForLabelMatchers(minTimestamp, matcherSets...) |
|
if err != nil { |
|
http.Error(w, err.Error(), http.StatusInternalServerError) |
|
return |
|
} |
|
for _, s := range vector { |
|
globalUsed := map[model.LabelName]struct{}{} |
|
|
|
// Reset label slice. |
|
protMetric.Label = protMetric.Label[:0] |
|
|
|
for ln, lv := range s.Metric { |
|
if ln == model.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)), |
|
}) |
|
if _, ok := h.externalLabels[ln]; ok { |
|
globalUsed[ln] = struct{}{} |
|
} |
|
} |
|
|
|
// 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)) |
|
|
|
if err := enc.Encode(protMetricFam); err != nil { |
|
http.Error(w, err.Error(), http.StatusInternalServerError) |
|
return |
|
} |
|
} |
|
}
|
|
|