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// Copyright 2016 Circonus, Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package circonusgometrics
// A Gauge is an instantaneous measurement of a value.
//
// Use a gauge to track metrics which increase and decrease (e.g., amount of
// free memory).
import (
"fmt"
)
// Gauge sets a gauge to a value
func (m *CirconusMetrics) Gauge(metric string, val interface{}) {
m.SetGauge(metric, val)
}
// SetGauge sets a gauge to a value
func (m *CirconusMetrics) SetGauge(metric string, val interface{}) {
m.gm.Lock()
defer m.gm.Unlock()
m.gauges[metric] = val
}
// AddGauge adds value to existing gauge
func (m *CirconusMetrics) AddGauge(metric string, val interface{}) {
m.gm.Lock()
defer m.gm.Unlock()
v, ok := m.gauges[metric]
if !ok {
m.gauges[metric] = val
return
}
switch val.(type) {
default:
// ignore it, unsupported type
case int:
m.gauges[metric] = v.(int) + val.(int)
case int8:
m.gauges[metric] = v.(int8) + val.(int8)
case int16:
m.gauges[metric] = v.(int16) + val.(int16)
case int32:
m.gauges[metric] = v.(int32) + val.(int32)
case int64:
m.gauges[metric] = v.(int64) + val.(int64)
case uint:
m.gauges[metric] = v.(uint) + val.(uint)
case uint8:
m.gauges[metric] = v.(uint8) + val.(uint8)
case uint16:
m.gauges[metric] = v.(uint16) + val.(uint16)
case uint32:
m.gauges[metric] = v.(uint32) + val.(uint32)
case uint64:
m.gauges[metric] = v.(uint64) + val.(uint64)
case float32:
m.gauges[metric] = v.(float32) + val.(float32)
case float64:
m.gauges[metric] = v.(float64) + val.(float64)
}
}
// RemoveGauge removes a gauge
func (m *CirconusMetrics) RemoveGauge(metric string) {
m.gm.Lock()
defer m.gm.Unlock()
delete(m.gauges, metric)
}
// GetGaugeTest returns the current value for a gauge. (note: it is a function specifically for "testing", disable automatic submission during testing.)
func (m *CirconusMetrics) GetGaugeTest(metric string) (interface{}, error) {
m.gm.Lock()
defer m.gm.Unlock()
if val, ok := m.gauges[metric]; ok {
return val, nil
}
return nil, fmt.Errorf("Gauge metric '%s' not found", metric)
}
// SetGaugeFunc sets a gauge to a function [called at flush interval]
func (m *CirconusMetrics) SetGaugeFunc(metric string, fn func() int64) {
m.gfm.Lock()
defer m.gfm.Unlock()
m.gaugeFuncs[metric] = fn
}
// RemoveGaugeFunc removes a gauge function
func (m *CirconusMetrics) RemoveGaugeFunc(metric string) {
m.gfm.Lock()
defer m.gfm.Unlock()
delete(m.gaugeFuncs, metric)
}
// getGaugeType returns accurate resmon type for underlying type of gauge value
func (m *CirconusMetrics) getGaugeType(v interface{}) string {
mt := "n"
switch v.(type) {
case int:
mt = "i"
case int8:
mt = "i"
case int16:
mt = "i"
case int32:
mt = "i"
case uint:
mt = "I"
case uint8:
mt = "I"
case uint16:
mt = "I"
case uint32:
mt = "I"
case int64:
mt = "l"
case uint64:
mt = "L"
}
return mt
}
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