/
logemitter.go
62 lines (54 loc) · 1.39 KB
/
logemitter.go
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package usagerecorder
import (
"encoding/json"
"log/slog"
"math/rand"
"time"
)
type LogEmitter struct {
Logger *slog.Logger
SamplingRate int
RandomValueGenerator func() int
}
func defaultRandomValueGenerator() func() int {
r := rand.New(rand.NewSource(time.Now().UnixNano())) // #nosec G404
return func() int {
return r.Intn(100)
}
}
func NewLogEmitter(logger *slog.Logger, samplingRate int) *LogEmitter {
return &LogEmitter{
Logger: logger,
SamplingRate: samplingRate,
RandomValueGenerator: defaultRandomValueGenerator(),
}
}
func (x *LogEmitter) Emit(usage *GraphqlUsage) error {
if !x.Sampling() {
return nil
}
// To convert the GraphqlUsage struct to map[string]interface{}, we marshal and unmarshal it.
data, err := json.Marshal(usage)
if err != nil {
return err
}
var jsonObject map[string]interface{}
err = json.Unmarshal(data, &jsonObject)
if err != nil {
return err
}
x.Logger.With("graphqlusage", jsonObject).Info("graphql usage recorded")
return nil
}
// Sampling returns true if the sampling rate is 100 or the random value is less than the sampling rate.
func (x *LogEmitter) Sampling() bool {
if x.SamplingRate == 0 {
// Always false if sampling rate is 0
return false
}
if x.SamplingRate == 100 {
// Always true if sampling rate is 100
return true
}
return x.RandomValueGenerator() <= x.SamplingRate
}