init meter provider

go.mod

@@ -0,0 +1,17 @@
+module gitoa.ru/go-4devs/otel
+
+go 1.22.2
+
+require (
+	go.opentelemetry.io/otel v1.25.0
+	go.opentelemetry.io/otel/sdk v1.25.0
+	go.opentelemetry.io/otel/sdk/metric v1.25.0
+)
+
+require (
+	github.com/go-logr/logr v1.4.1 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	go.opentelemetry.io/otel/metric v1.25.0 // indirect
+	go.opentelemetry.io/otel/trace v1.25.0 // indirect
+	golang.org/x/sys v0.18.0 // indirect
+)

go.sum

@@ -0,0 +1,27 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
+github.com/go-logr/logr v1.4.1 h1:pKouT5E8xu9zeFC39JXRDukb6JFQPXM5p5I91188VAQ=
+github.com/go-logr/logr v1.4.1/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
+github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
+github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
+github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+go.opentelemetry.io/otel v1.25.0 h1:gldB5FfhRl7OJQbUHt/8s0a7cE8fbsPAtdpRaApKy4k=
+go.opentelemetry.io/otel v1.25.0/go.mod h1:Wa2ds5NOXEMkCmUou1WA7ZBfLTHWIsp034OVD7AO+Vg=
+go.opentelemetry.io/otel/metric v1.25.0 h1:LUKbS7ArpFL/I2jJHdJcqMGxkRdxpPHE0VU/D4NuEwA=
+go.opentelemetry.io/otel/metric v1.25.0/go.mod h1:rkDLUSd2lC5lq2dFNrX9LGAbINP5B7WBkC78RXCpH5s=
+go.opentelemetry.io/otel/sdk v1.25.0 h1:PDryEJPC8YJZQSyLY5eqLeafHtG+X7FWnf3aXMtxbqo=
+go.opentelemetry.io/otel/sdk v1.25.0/go.mod h1:oFgzCM2zdsxKzz6zwpTZYLLQsFwc+K0daArPdIhuxkw=
+go.opentelemetry.io/otel/sdk/metric v1.25.0 h1:7CiHOy08LbrxMAp4vWpbiPcklunUshVpAvGBrdDRlGw=
+go.opentelemetry.io/otel/sdk/metric v1.25.0/go.mod h1:LzwoKptdbBBdYfvtGCzGwk6GWMA3aUzBOwtQpR6Nz7o=
+go.opentelemetry.io/otel/trace v1.25.0 h1:tqukZGLwQYRIFtSQM2u2+yfMVTgGVeqRLPUYx1Dq6RM=
+go.opentelemetry.io/otel/trace v1.25.0/go.mod h1:hCCs70XM/ljO+BeQkyFnbK28SBIJ/Emuha+ccrCRT7I=
+golang.org/x/sys v0.18.0 h1:DBdB3niSjOA/O0blCZBqDefyWNYveAYMNF1Wum0DYQ4=
+golang.org/x/sys v0.18.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

meter/provider.go

@@ -0,0 +1,115 @@
+package meter
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/sdk/metric"
+	"go.opentelemetry.io/otel/sdk/resource"
+	semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
+)
+
+func WithServiceName(name string) func(*Option) error {
+	return func(o *Option) error {
+		o.serviceName = name
+
+		return nil
+	}
+}
+
+func WithAttributes(attrs ...attribute.KeyValue) func(context.Context, *Option) error {
+	return func(_ context.Context, o *Option) error {
+		o.attributes = attrs
+
+		return nil
+	}
+}
+
+func WithExtraResource(opts ...resource.Option) func(context.Context, *Option) error {
+	return func(_ context.Context, o *Option) error {
+		o.extraResource = opts
+
+		return nil
+	}
+}
+
+func WithReader(reader metric.Reader) func(context.Context, *Option) error {
+	return func(_ context.Context, o *Option) error {
+		o.reader = reader
+
+		return nil
+	}
+}
+
+type Option struct {
+	reader        metric.Reader
+	serviceName   string
+	attributes    []attribute.KeyValue
+	extraResource []resource.Option
+}
+
+func newOptions(ctx context.Context, opts ...func(context.Context, *Option) error) (Option, error) {
+	option := Option{
+		serviceName: filepath.Base(os.Args[0]),
+		extraResource: []resource.Option{
+			resource.WithOS(),
+			resource.WithProcess(),
+			resource.WithContainer(),
+			resource.WithHost(),
+		},
+	}
+
+	for idx, opt := range opts {
+		if err := opt(ctx, &option); err != nil {
+			return option, fmt.Errorf("option[%d]:%w", idx, err)
+		}
+	}
+
+	return option, nil
+}
+
+func New(ctx context.Context, opts ...func(context.Context, *Option) error) (*metric.MeterProvider, error) {
+	option, err := newOptions(ctx, opts...)
+	if err != nil {
+		return nil, fmt.Errorf("configure:%w", err)
+	}
+
+	extraResources, eerr := resource.New(
+		ctx,
+		append(
+			option.extraResource,
+			resource.WithAttributes(
+				append(
+					option.attributes,
+					semconv.ServiceName(option.serviceName),
+				)...,
+			),
+		)...,
+	)
+	if eerr != nil {
+		return nil, fmt.Errorf("create extra resource: %w", eerr)
+	}
+
+	res, rerr := resource.Merge(
+		resource.Default(),
+		extraResources,
+	)
+	if rerr != nil {
+		return nil, fmt.Errorf("merge resource: %w", rerr)
+	}
+
+	provOption := make([]metric.Option, 0, 2)
+
+	if option.reader != nil {
+		provOption = append(provOption, metric.WithReader(option.reader))
+	}
+
+	meterProvider := metric.NewMeterProvider(append(provOption, metric.WithResource(res))...)
+	otel.SetMeterProvider(meterProvider)
+
+	return meterProvider, nil
+}