/
tracing.go
64 lines (54 loc) · 2 KB
/
tracing.go
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
package otelinit
import (
"context"
"log"
"go.opentelemetry.io/otel"
otlpgrpc "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
"google.golang.org/grpc/credentials"
)
func (c config) initTracing(ctx context.Context) OtelShutdown {
// set the service name that will show up in tracing UIs
resAttrs := resource.WithAttributes(semconv.ServiceNameKey.String(c.servicename))
res, err := resource.New(ctx, resAttrs)
if err != nil {
log.Fatalf("failed to create OpenTelemetry service name resource: %s", err)
}
grpcOpts := []otlpgrpc.Option{otlpgrpc.WithEndpoint(c.endpoint)}
if c.insecure {
grpcOpts = append(grpcOpts, otlpgrpc.WithInsecure())
} else {
creds := credentials.NewClientTLSFromCert(nil, "")
grpcOpts = append(grpcOpts, otlpgrpc.WithTLSCredentials(creds))
}
// TODO: add TLS client cert auth
exporter, err := otlpgrpc.New(ctx, grpcOpts...)
if err != nil {
log.Fatalf("failed to configure OTLP exporter: %s", err)
}
// TODO: more configuration opportunities here
bsp := sdktrace.NewBatchSpanProcessor(exporter)
tracerProvider := sdktrace.NewTracerProvider(
sdktrace.WithResource(res),
sdktrace.WithSpanProcessor(bsp),
)
// set global propagator to tracecontext (the default is no-op).
prop := propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{})
otel.SetTextMapPropagator(prop)
// inject the tracer into the otel globals, start background goroutines
otel.SetTracerProvider(tracerProvider)
// the public function will wrap this in its own shutdown function
return func(ctx context.Context) {
err = tracerProvider.Shutdown(ctx)
if err != nil {
log.Printf("shutdown of OpenTelemetry tracerProvider failed: %s", err)
}
err = exporter.Shutdown(ctx)
if err != nil {
log.Printf("shutdown of OpenTelemetry OTLP exporter failed: %s", err)
}
}
}