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gauge.go
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gauge.go
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// Copyright (C) 2019-2024 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 (
"strings"
)
// Gauge represent a single gauge variable.
type Gauge struct {
g couge
}
// MakeGauge create a new gauge with the provided name and description.
func MakeGauge(metric MetricName) *Gauge {
c := &Gauge{g: couge{
values: make([]*cougeValues, 0),
description: metric.Description,
name: metric.Name,
labels: make(map[string]int),
valuesIndices: make(map[int]int),
}}
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)
}
}
// Set sets gauge to x
func (gauge *Gauge) Set(x uint64) {
if gauge.g.intValue.Swap(x) == 0 {
// This is the first Set. Create a dummy
// counterValue for the no-labels value.
// Dummy counterValue simplifies display in WriteMetric.
gauge.g.setLabels(0, nil)
}
}
// SetLabels sets gauge to x with labels
func (gauge *Gauge) SetLabels(x uint64, labels map[string]string) {
gauge.g.setLabels(x, labels)
}
// WriteMetric writes the metric into the output stream
func (gauge *Gauge) WriteMetric(buf *strings.Builder, parentLabels string) {
gauge.g.writeMetric(buf, "gauge", parentLabels)
}
// AddMetric adds the metric into the map
func (gauge *Gauge) AddMetric(values map[string]float64) {
gauge.g.addMetric(values)
}
// GetUint64ValueForLabels returns the value of the counter for the given labels or 0 if it's not found.
func (gauge *Gauge) GetUint64ValueForLabels(labels map[string]string) uint64 {
return gauge.g.getUint64ValueForLabels(labels)
}