image/resources/knfsd-fsidd/internal/metrics/metrics.go

/*
 Copyright 2022 Google LLC

 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

      https://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 metrics

import (
	"context"
	"time"

	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/metric/global"
	"go.opentelemetry.io/otel/metric/instrument"
	"go.opentelemetry.io/otel/metric/unit"
)

var meter = global.Meter("fsid")

var (
	dimensionless = instrument.WithUnit(unit.Dimensionless)
	milliseconds  = instrument.WithUnit(unit.Milliseconds)
)

var (
	requestCount    = counter("fsid.request.count", dimensionless)
	requestDuration = duration("fsid.request.duration", milliseconds)
	requestRetries  = int64Histogram("fsid.request.retries", dimensionless)

	operationCount    = counter("fsid.operation.count", dimensionless)
	operationDuration = duration("fsid.operation.duration", milliseconds)

	sqlQueryCount    = counter("fsid.sql.query.count", dimensionless)
	sqlQueryDuration = duration("fsid.sql.query.duration", milliseconds)
)

func Request(ctx context.Context, command, result string, retries int64, duration time.Duration) {
	attrs := []attribute.KeyValue{
		attribute.String("command", command),
		attribute.String("result", result),
	}
	requestCount.Add(ctx, 1, attrs...)
	requestDuration.Record(ctx, ms(duration), attrs...)
	requestRetries.Record(ctx, retries, attrs...)
}

func Operation(ctx context.Context, command, result string, retry int64, duration time.Duration) {
	attrs := []attribute.KeyValue{
		attribute.String("command", command),
		attribute.String("result", result),
		attribute.Int64("retry", retry),
	}
	operationCount.Add(ctx, 1, attrs...)
	operationDuration.Record(ctx, ms(duration), attrs...)
}

func SQLOperation(ctx context.Context, query, result string, duration time.Duration) {
	attrs := []attribute.KeyValue{
		attribute.String("query", query),
		attribute.String("result", result),
	}
	sqlQueryCount.Add(ctx, 1, attrs...)
	sqlQueryDuration.Record(ctx, ms(duration), attrs...)
}

func counter(name string, opts ...instrument.Int64Option) instrument.Int64Counter {
	m, err := meter.Int64Counter(name, opts...)
	if err != nil {
		otel.Handle(err)
	}
	return m
}

func duration(name string, opts ...instrument.Float64Option) instrument.Float64Histogram {
	m, err := meter.Float64Histogram(name, opts...)
	if err != nil {
		otel.Handle(err)
	}
	return m
}

func int64Histogram(name string, opts ...instrument.Int64Option) instrument.Int64Histogram {
	m, err := meter.Int64Histogram(name, opts...)
	if err != nil {
		otel.Handle(err)
	}
	return m
}

func ms(duration time.Duration) float64 {
	return float64(duration) / float64(time.Millisecond)
}