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ootel.go
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ootel.go
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package ootel
import (
"context"
"errors"
"fmt"
"net/http"
"github.com/alpineworks/ootel/healthcheck"
"github.com/prometheus/client_golang/prometheus/promhttp"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/exporters/prometheus"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/metric"
"go.opentelemetry.io/otel/sdk/resource"
"go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.24.0"
)
type traceConfig struct {
Enabled bool
SampleRate float64
ServiceName string
ServiceVersion string
}
type metricConfig struct {
Enabled bool
ServerPort int
}
type OotelClient struct {
traceConfig *traceConfig
metricConfig *metricConfig
}
type OotelClientOption func(*OotelClient)
func NewOotelClient(options ...OotelClientOption) *OotelClient {
client := &OotelClient{}
// functional options pattern
for _, option := range options {
option(client)
}
return client
}
func NewTraceConfig(enabled bool, sampleRate float64, serviceName, serviceVersion string) *traceConfig {
return &traceConfig{
Enabled: enabled,
SampleRate: sampleRate,
ServiceName: serviceName,
ServiceVersion: serviceVersion,
}
}
func WithTraceConfig(tc *traceConfig) OotelClientOption {
return func(oc *OotelClient) {
oc.traceConfig = tc
}
}
func NewMetricConfig(enabled bool, serverPort int) *metricConfig {
return &metricConfig{
Enabled: enabled,
ServerPort: serverPort,
}
}
func WithMetricConfig(mc *metricConfig) OotelClientOption {
return func(oc *OotelClient) {
oc.metricConfig = mc
}
}
func (oc *OotelClient) Init(ctx context.Context) (func(context.Context) error, error) {
shutdownFuncs := make([]func(context.Context) error, 0)
shutdown := func(ctx context.Context) error {
var errs []error
for _, f := range shutdownFuncs {
if err := f(ctx); err != nil {
errs = append(errs, err)
}
}
return errors.Join(errs...)
}
if oc.traceConfig != nil && oc.traceConfig.Enabled {
// Set up propagator.
otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(
propagation.TraceContext{},
propagation.Baggage{},
))
// Set up trace provider.
tracerProvider, err := traceProvider(ctx, oc.traceConfig)
if err != nil {
return nil, fmt.Errorf("failed to create trace provider: %w", err)
}
otel.SetTracerProvider(tracerProvider)
}
if oc.metricConfig != nil && oc.metricConfig.Enabled {
// Set up meter provider.
meterProvider, err := meterProvider()
if err != nil {
return nil, fmt.Errorf("failed to create meter provider: %w", err)
}
shutdownFuncs = append(shutdownFuncs, meterProvider.Shutdown)
otel.SetMeterProvider(meterProvider)
go func() {
if err := startMetricServer(oc.metricConfig.ServerPort); err != nil {
fmt.Println(err)
}
}()
}
return shutdown, nil
}
func traceProvider(ctx context.Context, tc *traceConfig) (*trace.TracerProvider, error) {
traceExporter, err := otlptracegrpc.New(ctx, otlptracegrpc.WithInsecure())
if err != nil {
return nil, err
}
traceResource, err := resource.Merge(resource.Default(),
resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceName(tc.ServiceName),
semconv.ServiceVersion(tc.ServiceVersion),
))
if err != nil {
return nil, fmt.Errorf("failed to create trace resource: %w", err)
}
traceProvider := trace.NewTracerProvider(
trace.WithSpanProcessor(trace.NewBatchSpanProcessor(traceExporter)),
trace.WithSampler(trace.ParentBased(trace.TraceIDRatioBased(tc.SampleRate))),
trace.WithResource(traceResource),
)
return traceProvider, nil
}
func meterProvider() (*metric.MeterProvider, error) {
metricExporter, err := prometheus.New()
if err != nil {
return nil, fmt.Errorf("failed to create metric exporter: %w", err)
}
meterProvider := metric.NewMeterProvider(
metric.WithReader(metricExporter),
)
return meterProvider, nil
}
func startMetricServer(port int) error {
http.HandleFunc("/healthcheck", healthcheck.HealthcheckHandler)
http.Handle("/metrics", promhttp.Handler())
err := http.ListenAndServe(fmt.Sprintf(":%d", port), nil)
if err != nil {
return fmt.Errorf("failed to start metric server: %w", err)
}
return nil
}