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// SPDX-License-Identifier: GPL-3.0-or-later
package metrics
import (
"github.com/axiomhq/hyperloglog"
"github.com/netdata/netdata/go/go.d.plugin/pkg/stm"
)
type (
UniqueCounter interface {
stm.Value
Insert(s string)
Value() int
Reset()
}
mapUniqueCounter struct {
m map[string]bool
}
hyperLogLogUniqueCounter struct {
sketch *hyperloglog.Sketch
}
UniqueCounterVec struct {
useHyperLogLog bool
Items map[string]UniqueCounter
}
)
var (
_ stm.Value = mapUniqueCounter{}
_ stm.Value = hyperLogLogUniqueCounter{}
_ stm.Value = UniqueCounterVec{}
)
func NewUniqueCounter(useHyperLogLog bool) UniqueCounter {
if useHyperLogLog {
return &hyperLogLogUniqueCounter{hyperloglog.New()}
}
return mapUniqueCounter{map[string]bool{}}
}
func (c mapUniqueCounter) WriteTo(rv map[string]int64, key string, mul, div int) {
rv[key] = int64(float64(c.Value()*mul) / float64(div))
}
func (c mapUniqueCounter) Insert(s string) {
c.m[s] = true
}
func (c mapUniqueCounter) Value() int {
return len(c.m)
}
func (c mapUniqueCounter) Reset() {
for key := range c.m {
delete(c.m, key)
}
}
// WriteTo writes its value into given map.
func (c hyperLogLogUniqueCounter) WriteTo(rv map[string]int64, key string, mul, div int) {
rv[key] = int64(float64(c.Value()*mul) / float64(div))
}
func (c *hyperLogLogUniqueCounter) Insert(s string) {
c.sketch.Insert([]byte(s))
}
func (c *hyperLogLogUniqueCounter) Value() int {
return int(c.sketch.Estimate())
}
func (c *hyperLogLogUniqueCounter) Reset() {
c.sketch = hyperloglog.New()
}
func NewUniqueCounterVec(useHyperLogLog bool) UniqueCounterVec {
return UniqueCounterVec{
Items: map[string]UniqueCounter{},
useHyperLogLog: useHyperLogLog,
}
}
// WriteTo writes its value into given map.
func (c UniqueCounterVec) WriteTo(rv map[string]int64, key string, mul, div int) {
for name, value := range c.Items {
value.WriteTo(rv, key+"_"+name, mul, div)
}
}
// Get gets UniqueCounter instance by name
func (c UniqueCounterVec) Get(name string) UniqueCounter {
item, ok := c.Items[name]
if ok {
return item
}
item = NewUniqueCounter(c.useHyperLogLog)
c.Items[name] = item
return item
}
func (c UniqueCounterVec) Reset() {
for _, value := range c.Items {
value.Reset()
}
}
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