forked from cerc-io/plugeth
53f3c2ae65
This chang creates a GaugeInfo metrics type for registering informational (textual) metrics, e.g. geth version number. It also improves the testing for backend-exporters, and uses a shared subpackage in 'internal' to provide sample datasets and ordered registry. Implements #21783 --------- Co-authored-by: Martin Holst Swende <martin@swende.se>
53 lines
1.7 KiB
Go
53 lines
1.7 KiB
Go
// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package prometheus exposes go-metrics into a Prometheus format.
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package prometheus
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import (
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"fmt"
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"net/http"
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"sort"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/metrics"
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)
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// Handler returns an HTTP handler which dump metrics in Prometheus format.
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func Handler(reg metrics.Registry) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// Gather and pre-sort the metrics to avoid random listings
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var names []string
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reg.Each(func(name string, i interface{}) {
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names = append(names, name)
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})
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sort.Strings(names)
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// Aggregate all the metrics into a Prometheus collector
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c := newCollector()
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for _, name := range names {
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i := reg.Get(name)
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if err := c.Add(name, i); err != nil {
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log.Warn("Unknown Prometheus metric type", "type", fmt.Sprintf("%T", i))
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}
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}
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w.Header().Add("Content-Type", "text/plain")
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w.Header().Add("Content-Length", fmt.Sprint(c.buff.Len()))
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w.Write(c.buff.Bytes())
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})
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}
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