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package solomon
import (
"encoding/json"
"time"
"go.uber.org/atomic"
)
var _ Metric = (*FuncCounter)(nil)
// FuncCounter tracks int64 value returned by function.
type FuncCounter struct {
name string
metricType metricType
tags map[string]string
function func() int64
timestamp *time.Time
useNameTag bool
}
func (c *FuncCounter) Name() string {
return c.name
}
func (c *FuncCounter) Function() func() int64 {
return c.function
}
func (c *FuncCounter) getType() metricType {
return c.metricType
}
func (c *FuncCounter) getLabels() map[string]string {
return c.tags
}
func (c *FuncCounter) getValue() interface{} {
return c.function()
}
func (c *FuncCounter) getTimestamp() *time.Time {
return c.timestamp
}
func (c *FuncCounter) getNameTag() string {
if c.useNameTag {
return "name"
} else {
return "sensor"
}
}
// MarshalJSON implements json.Marshaler.
func (c *FuncCounter) MarshalJSON() ([]byte, error) {
return json.Marshal(struct {
Type string `json:"type"`
Labels map[string]string `json:"labels"`
Value int64 `json:"value"`
Timestamp *int64 `json:"ts,omitempty"`
}{
Type: c.metricType.String(),
Value: c.function(),
Labels: func() map[string]string {
labels := make(map[string]string, len(c.tags)+1)
labels[c.getNameTag()] = c.Name()
for k, v := range c.tags {
labels[k] = v
}
return labels
}(),
Timestamp: tsAsRef(c.timestamp),
})
}
// Snapshot returns independent copy on metric.
func (c *FuncCounter) Snapshot() Metric {
return &Counter{
name: c.name,
metricType: c.metricType,
tags: c.tags,
value: *atomic.NewInt64(c.function()),
useNameTag: c.useNameTag,
}
}
|
