/
tracer.go
98 lines (85 loc) · 2.48 KB
/
tracer.go
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package tracing
import (
"context"
"crypto/tls"
"strings"
"time"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
"go.opentelemetry.io/otel/propagation"
"google.golang.org/grpc/credentials"
"github.com/flanksource/commons/logger"
"go.opentelemetry.io/otel/sdk/resource"
"go.opentelemetry.io/otel/sdk/trace"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
)
type Tracer struct {
ServiceName string
CollectorURL string
Insecure bool
Samplers map[string]trace.Sampler
}
func (tracer Tracer) Sample(name string, perc float64) Tracer {
tracer.Samplers[name] = NewCounterSampler(perc)
return tracer
}
func (tracer Tracer) Init() func() {
var client otlptrace.Client
if strings.HasPrefix(tracer.CollectorURL, "http") {
client = otlptracehttp.NewClient(
otlptracehttp.WithInsecure(),
otlptracehttp.WithEndpoint(strings.ReplaceAll(tracer.CollectorURL, "https://", "")),
otlptracehttp.WithCompression(otlptracehttp.GzipCompression),
otlptracehttp.WithTLSClientConfig(&tls.Config{}))
} else {
var secureOption otlptracegrpc.Option
if !tracer.Insecure {
secureOption = otlptracegrpc.WithTLSCredentials(credentials.NewClientTLSFromCert(nil, ""))
} else {
secureOption = otlptracegrpc.WithInsecure()
}
client = otlptracegrpc.NewClient(
secureOption,
otlptracegrpc.WithEndpoint(tracer.CollectorURL),
)
}
exporter, err := otlptrace.New(
context.Background(),
client,
)
if err != nil {
logger.Errorf("Failed to create opentelemetry exporter: %v", err)
return func() {}
}
resources, err := resource.New(
context.Background(),
resource.WithAttributes(
attribute.String("service.name", tracer.ServiceName),
),
)
if err != nil {
logger.Errorf("Could not set opentelemetry resources: %v", err)
return func() {}
}
otel.SetTracerProvider(
sdktrace.NewTracerProvider(
sdktrace.WithSampler(NewCustomSampler(sdktrace.AlwaysSample(), tracer.Samplers)),
sdktrace.WithBatcher(exporter),
sdktrace.WithResource(resources),
),
)
// Register the TraceContext propagator globally.
otel.SetTextMapPropagator(propagation.TraceContext{})
return func() {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*30)
defer cancel()
err := exporter.Shutdown(ctx)
if err != nil {
logger.Errorf(err.Error())
}
defer cancel()
}
}