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metrics_exporter.go
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/
metrics_exporter.go
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// Copyright 2019 The Nakama Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"go.opencensus.io/plugin/ocgrpc"
"go.opencensus.io/stats/view"
"go.uber.org/atomic"
"go.uber.org/zap"
)
type MetricsExporter struct {
logger *zap.Logger
Latency *atomic.Float64
Rate *atomic.Float64
Input *atomic.Float64
Output *atomic.Float64
}
func NewMetricsExporter(logger *zap.Logger) *MetricsExporter {
return &MetricsExporter{
logger: logger,
Latency: atomic.NewFloat64(0),
Rate: atomic.NewFloat64(0),
Input: atomic.NewFloat64(0),
Output: atomic.NewFloat64(0),
}
}
func (m *MetricsExporter) ExportView(vd *view.Data) {
windowSec := float64(vd.End.Unix() - vd.Start.Unix())
if windowSec <= 0 {
return
}
switch vd.View {
case ocgrpc.ServerLatencyView:
var count, mean float64
for _, row := range vd.Rows {
rdd, ok := row.Data.(*view.DistributionData)
if !ok {
m.logger.Warn("Error casting metrics view row data.", zap.String("view", ocgrpc.ServerLatencyView.Name))
continue
}
c := float64(rdd.Count)
if c == 0 {
continue
}
count, mean = c+count, (c*rdd.Mean+count*mean)/(c+count)
}
// Average latency across all requests for all handlers.
m.Latency.Store(mean)
case ocgrpc.ServerCompletedRPCsView:
var count int64
for _, row := range vd.Rows {
rcd, ok := row.Data.(*view.CountData)
if !ok {
m.logger.Warn("Error casting metrics view row data.", zap.String("view", ocgrpc.ServerCompletedRPCsView.Name))
continue
}
count += rcd.Value
//for _, t := range row.Tags {
// if t.Key.Name() == ocgrpc.KeyServerStatus.Name() && t.Value != codes.OK.String() {
// // If error counts are ever needed this is how they're exposed.
// }
//}
}
m.Rate.Store(float64(count) / windowSec)
case ocgrpc.ServerReceivedBytesPerRPCView:
var total float64
for _, row := range vd.Rows {
rdd, ok := row.Data.(*view.DistributionData)
if !ok {
m.logger.Warn("Error casting metrics view row data.", zap.String("view", ocgrpc.ServerCompletedRPCsView.Name))
continue
}
total += rdd.Mean * float64(rdd.Count)
}
m.Input.Store(total / 1024 / windowSec)
case ocgrpc.ServerSentBytesPerRPCView:
var total float64
for _, row := range vd.Rows {
rdd, ok := row.Data.(*view.DistributionData)
if !ok {
m.logger.Warn("Error casting metrics view row data.", zap.String("view", ocgrpc.ServerCompletedRPCsView.Name))
continue
}
total += rdd.Mean * float64(rdd.Count)
}
m.Output.Store(total / 1024 / windowSec)
}
}