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otel.go
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otel.go
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package telemetry
import (
"context"
"fmt"
"log"
"os"
"time"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/metric"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.21.0"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
"google.golang.org/grpc/encoding/gzip"
)
const (
otelCollectorGRPCEndpoint = "0.0.0.0:4317"
metricExportPeriod = 60 * time.Second
)
type client struct {
tracerProvider *sdktrace.TracerProvider
meterProvider *metric.MeterProvider
}
// InitOTLPExporter initializes an OTLP exporter, and configures the corresponding trace providers.
func InitOTLPExporter(serviceName, serviceVersion string) func() {
attributes := []attribute.KeyValue{
semconv.ServiceName(serviceName),
semconv.ServiceVersion(serviceVersion),
semconv.TelemetrySDKName("otel"),
semconv.TelemetrySDKLanguageGo,
}
hostname, err := os.Hostname()
if err == nil {
attributes = append(attributes, semconv.HostName(hostname))
}
ctx := context.Background()
res, err := resource.New(
ctx,
resource.WithSchemaURL(semconv.SchemaURL),
resource.WithAttributes(attributes...),
)
if err != nil {
panic(fmt.Errorf("failed to create resource: %w", err))
}
var otelClient client
go func() {
// Set up a connection to the collector.
var conn *grpc.ClientConn
retryInterval := 5 * time.Second
for {
dialCtx, cancel := context.WithTimeout(ctx, time.Second)
conn, err = grpc.DialContext(dialCtx,
otelCollectorGRPCEndpoint,
// Note the use of insecure transport here. TLS is recommended in production.
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithBlock(),
)
cancel()
if err != nil {
log.Printf("Failed to connect to otel collector: %v", err)
time.Sleep(retryInterval)
} else {
break
}
}
// Set up a trace exporter
traceExporter, traceErr := otlptracegrpc.New(
ctx,
otlptracegrpc.WithGRPCConn(conn),
otlptracegrpc.WithCompressor(gzip.Name),
)
if traceErr != nil {
panic(fmt.Errorf("failed to create trace exporter: %w", err))
}
// Register the trace exporter with a TracerProvider, using a batch
// span processor to aggregate spans before export.
bsp := sdktrace.NewBatchSpanProcessor(traceExporter)
tracerProvider := sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.AlwaysSample()),
sdktrace.WithResource(res),
sdktrace.WithSpanProcessor(bsp),
)
otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
otel.SetTracerProvider(tracerProvider)
metricExporter, metricErr := otlpmetricgrpc.New(ctx, otlpmetricgrpc.WithGRPCConn(conn))
if metricErr != nil {
panic(fmt.Errorf("failed to create metric exporter: %w", err))
}
meterProvider := metric.NewMeterProvider(
metric.WithResource(res),
metric.WithReader(
metric.NewPeriodicReader(
metricExporter,
metric.WithInterval(metricExportPeriod),
),
),
)
otel.SetMeterProvider(meterProvider)
}()
// Shutdown will flush any remaining spans and shut down the exporter.
return func() {
otelClient.close()
}
}
func (c *client) close() {
ctx := context.Background()
if c.tracerProvider != nil {
if err := c.tracerProvider.Shutdown(ctx); err != nil {
log.Fatal(err)
}
}
if c.meterProvider != nil {
if err := c.meterProvider.Shutdown(ctx); err != nil {
log.Fatal(err)
}
}
}