forked from flashcat/categraf
61 lines
1.4 KiB
Go
61 lines
1.4 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
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// This file is available under the Apache license.
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package exporter
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import (
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"expvar"
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"fmt"
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"net/http"
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"sort"
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"strings"
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"flashcat.cloud/categraf/inputs/mtail/internal/metrics"
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)
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var exportVarzTotal = expvar.NewInt("exporter_varz_total")
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const varzFormat = "%s{%s} %s\n"
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// HandleVarz exports the metrics in Varz format via HTTP.
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func (e *Exporter) HandleVarz(w http.ResponseWriter, r *http.Request) {
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w.Header().Add("Content-type", "text/plain")
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err := e.store.Range(func(m *metrics.Metric) error {
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select {
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case <-r.Context().Done():
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return r.Context().Err()
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default:
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}
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m.RLock()
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exportVarzTotal.Add(1)
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lc := make(chan *metrics.LabelSet)
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go m.EmitLabelSets(lc)
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for l := range lc {
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line := metricToVarz(m, l, e.omitProgLabel, e.hostname)
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fmt.Fprint(w, line)
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}
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m.RUnlock()
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return nil
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})
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if err != nil {
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http.Error(w, fmt.Sprintf("%s", err), http.StatusInternalServerError)
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}
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}
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func metricToVarz(m *metrics.Metric, l *metrics.LabelSet, omitProgLabel bool, hostname string) string {
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s := make([]string, 0, len(l.Labels)+2)
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for k, v := range l.Labels {
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s = append(s, fmt.Sprintf("%s=%s", k, v))
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}
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sort.Strings(s)
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if !omitProgLabel {
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s = append(s, fmt.Sprintf("prog=%s", m.Program))
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}
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s = append(s, fmt.Sprintf("instance=%s", hostname))
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return fmt.Sprintf(varzFormat,
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m.Name,
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strings.Join(s, ","),
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l.Datum.ValueString())
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}
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