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// Copyright (C) 2019-2023 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package metrics
import (
"strconv"
"strings"
"sync/atomic"
)
// Gauge represent a single gauge variable.
type Gauge struct {
value atomic.Uint64
name string
description string
}
// MakeGauge create a new gauge with the provided name and description.
func MakeGauge(metric MetricName) *Gauge {
c := &Gauge{
description: metric.Description,
name: metric.Name,
}
c.Register(nil)
return c
}
// Register registers the gauge with the default/specific registry
func (gauge *Gauge) Register(reg *Registry) {
if reg == nil {
DefaultRegistry().Register(gauge)
} else {
reg.Register(gauge)
}
}
// Deregister deregisters the gauge with the default/specific registry
func (gauge *Gauge) Deregister(reg *Registry) {
if reg == nil {
DefaultRegistry().Deregister(gauge)
} else {
reg.Deregister(gauge)
}
}
// Add increases gauge by x
func (gauge *Gauge) Add(x uint64) {
gauge.value.Add(x)
}
// Set sets gauge to x
func (gauge *Gauge) Set(x uint64) {
gauge.value.Store(x)
}
// WriteMetric writes the metric into the output stream
func (gauge *Gauge) WriteMetric(buf *strings.Builder, parentLabels string) {
buf.WriteString("# HELP ")
buf.WriteString(gauge.name)
buf.WriteString(" ")
buf.WriteString(gauge.description)
buf.WriteString("\n# TYPE ")
buf.WriteString(gauge.name)
buf.WriteString(" gauge\n")
buf.WriteString(gauge.name)
buf.WriteString("{")
if len(parentLabels) > 0 {
buf.WriteString(parentLabels)
}
buf.WriteString("} ")
value := gauge.value.Load()
buf.WriteString(strconv.FormatUint(value, 10))
buf.WriteString("\n")
}
// AddMetric adds the metric into the map
func (gauge *Gauge) AddMetric(values map[string]float64) {
value := gauge.value.Load()
values[sanitizeTelemetryName(gauge.name)] = float64(value)
}
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