otelemetry/metrics.go at master · rorua/otelemetry · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
package otelemetry

import (
	"context"
	"time"

	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc"
	"go.opentelemetry.io/otel/exporters/stdout/stdoutmetric"
	"go.opentelemetry.io/otel/metric"
	sdkmetric "go.opentelemetry.io/otel/sdk/metric"
	sdkresource "go.opentelemetry.io/otel/sdk/resource"
)

// Metric interface provides methods for creating and managing various types of metrics.
type Metric interface {
	// Metric returns the underlying OpenTelemetry meter.
	Metric() metric.Meter

	Int64Counter(name string, options ...metric.Int64CounterOption) (metric.Int64Counter, error)
	Int64UpDownCounter(name string, options ...metric.Int64UpDownCounterOption) (metric.Int64UpDownCounter, error)
	Int64Histogram(name string, options ...metric.Int64HistogramOption) (metric.Int64Histogram, error)
	Int64Gauge(name string, options ...metric.Int64GaugeOption) (metric.Int64Gauge, error)
	Int64ObservableCounter(name string, options ...metric.Int64ObservableCounterOption) (metric.Int64ObservableCounter, error)
	Int64ObservableUpDownCounter(name string, options ...metric.Int64ObservableUpDownCounterOption) (metric.Int64ObservableUpDownCounter, error)
	Int64ObservableGauge(name string, options ...metric.Int64ObservableGaugeOption) (metric.Int64ObservableGauge, error)
	Float64Counter(name string, options ...metric.Float64CounterOption) (metric.Float64Counter, error)
	Float64UpDownCounter(name string, options ...metric.Float64UpDownCounterOption) (metric.Float64UpDownCounter, error)
	Float64Histogram(name string, options ...metric.Float64HistogramOption) (metric.Float64Histogram, error)
	Float64Gauge(name string, options ...metric.Float64GaugeOption) (metric.Float64Gauge, error)
	Float64ObservableCounter(name string, options ...metric.Float64ObservableCounterOption) (metric.Float64ObservableCounter, error)
	Float64ObservableUpDownCounter(name string, options ...metric.Float64ObservableUpDownCounterOption) (metric.Float64ObservableUpDownCounter, error)
	Float64ObservableGauge(name string, options ...metric.Float64ObservableGaugeOption) (metric.Float64ObservableGauge, error)
	RegisterCallback(f metric.Callback, instruments ...metric.Observable) (metric.Registration, error)
}

// otelmetric is an implementation of the Metric interface using OpenTelemetry.
type otelmetric struct {
	metric metric.Meter
}

func (m *otelmetric) Metric() metric.Meter {
	return m.metric
}

func (m *otelmetric) Int64Counter(name string, options ...metric.Int64CounterOption) (metric.Int64Counter, error) {
	return m.metric.Int64Counter(name, options...)
}

func (m *otelmetric) Int64UpDownCounter(name string, options ...metric.Int64UpDownCounterOption) (metric.Int64UpDownCounter, error) {
	return m.metric.Int64UpDownCounter(name, options...)
}

func (m *otelmetric) Int64Histogram(name string, options ...metric.Int64HistogramOption) (metric.Int64Histogram, error) {
	return m.metric.Int64Histogram(name, options...)
}

func (m *otelmetric) Int64Gauge(name string, options ...metric.Int64GaugeOption) (metric.Int64Gauge, error) {
	return m.metric.Int64Gauge(name, options...)
}

func (m *otelmetric) Int64ObservableCounter(name string, options ...metric.Int64ObservableCounterOption) (metric.Int64ObservableCounter, error) {
	return m.metric.Int64ObservableCounter(name, options...)
}

func (m *otelmetric) Int64ObservableUpDownCounter(name string, options ...metric.Int64ObservableUpDownCounterOption) (metric.Int64ObservableUpDownCounter, error) {
	return m.metric.Int64ObservableUpDownCounter(name, options...)
}

func (m *otelmetric) Int64ObservableGauge(name string, options ...metric.Int64ObservableGaugeOption) (metric.Int64ObservableGauge, error) {
	return m.metric.Int64ObservableGauge(name, options...)
}

func (m *otelmetric) Float64Counter(name string, options ...metric.Float64CounterOption) (metric.Float64Counter, error) {
	return m.metric.Float64Counter(name, options...)
}

func (m *otelmetric) Float64UpDownCounter(name string, options ...metric.Float64UpDownCounterOption) (metric.Float64UpDownCounter, error) {
	return m.metric.Float64UpDownCounter(name, options...)
}

func (m *otelmetric) Float64Histogram(name string, options ...metric.Float64HistogramOption) (metric.Float64Histogram, error) {
	return m.metric.Float64Histogram(name, options...)
}

func (m *otelmetric) Float64Gauge(name string, options ...metric.Float64GaugeOption) (metric.Float64Gauge, error) {
	return m.metric.Float64Gauge(name, options...)
}

func (m *otelmetric) Float64ObservableCounter(name string, options ...metric.Float64ObservableCounterOption) (metric.Float64ObservableCounter, error) {
	return m.metric.Float64ObservableCounter(name, options...)
}

func (m *otelmetric) Float64ObservableUpDownCounter(name string, options ...metric.Float64ObservableUpDownCounterOption) (metric.Float64ObservableUpDownCounter, error) {
	return m.metric.Float64ObservableUpDownCounter(name, options...)
}

func (m *otelmetric) Float64ObservableGauge(name string, options ...metric.Float64ObservableGaugeOption) (metric.Float64ObservableGauge, error) {
	return m.metric.Float64ObservableGauge(name, options...)
}

func (m *otelmetric) RegisterCallback(f metric.Callback, instruments ...metric.Observable) (metric.Registration, error) {
	return m.metric.RegisterCallback(f, instruments...)
}

func newMeterProvider(ctx context.Context, otelAgentAddr string, res *sdkresource.Resource, opts MetricOptions) (*sdkmetric.MeterProvider, error) {
	exporter, err := otlpmetricgrpc.New(ctx, meterExporterOpts(otelAgentAddr, opts.ExporterOptions...)...)
	if err != nil {
		return nil, err
	}

	provider := sdkmetric.NewMeterProvider(meterProviderOpts(exporter, func() time.Duration {
		if opts.PeriodicInterval == 0 {
			return 5 * time.Second
		}
		// Use the default if PeriodicInterval is not set
		// This allows for a custom interval to be set in MetricOptions
		return opts.PeriodicInterval
	}(), res, opts.ProviderOptions...)...)

	return provider, nil
}

func newStdoutMeterProvider(res *sdkresource.Resource) (*sdkmetric.MeterProvider, error) {
	exporter, err := stdoutmetric.New()
	if err != nil {
		return nil, err
	}

	provider := sdkmetric.NewMeterProvider(
		sdkmetric.WithResource(res),
		sdkmetric.WithReader(sdkmetric.NewPeriodicReader(exporter)),
	)

	return provider, nil
}

func meterExporterOpts(otelAgentAddr string, opts ...otlpmetricgrpc.Option) []otlpmetricgrpc.Option {
	options := []otlpmetricgrpc.Option{
		otlpmetricgrpc.WithInsecure(),
		otlpmetricgrpc.WithEndpoint(otelAgentAddr),
	}

	if len(opts) == 0 {
		return options
	}

	return opts
}

func meterProviderOpts(exporter sdkmetric.Exporter, interval time.Duration, res *sdkresource.Resource, opts ...sdkmetric.Option) []sdkmetric.Option {
	options := []sdkmetric.Option{
		sdkmetric.WithResource(res),
		sdkmetric.WithReader(
			sdkmetric.NewPeriodicReader(
				exporter,
				sdkmetric.WithInterval(interval), //2*time.Second
			),
		),
	}

	if len(opts) > 0 {
		options = append(options, opts...)
	}

	return options
}