otlploggrpc: Add examples with self-signed certificates

exporters/otlp/otlplog/otlploggrpc/example_test.go

@@ -5,6 +5,12 @@ package otlploggrpc_test
 
 import (
 	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"errors"
+	"os"
+
+	"google.golang.org/grpc/credentials"
 
 	"go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc"
 	"go.opentelemetry.io/otel/log/global"
@@ -31,3 +37,83 @@ func Example() {
 	// From here, the provider can be used by instrumentation to collect
 	// telemetry.
 }
+
+// Demonstrates how to configure the exporter using self-signed certificates for TLS connections.
+func Example_selfSignedCertificates_TLS() {
+	// Variables provided by the user.
+	var (
+		caFile string // The filepath to the server's CA certificate.
+	)
+
+	ctx := context.Background()
+
+	// Configure TLS connection.
+	creds, err := credentials.NewClientTLSFromFile(caFile, "")
+	if err != nil {
+		panic(err)
+	}
+	exp, err := otlploggrpc.New(ctx, otlploggrpc.WithTLSCredentials(creds))
+	if err != nil {
+		panic(err)
+	}
+
+	processor := log.NewBatchProcessor(exp)
+	provider := log.NewLoggerProvider(log.WithProcessor(processor))
+	defer func() {
+		if err := provider.Shutdown(ctx); err != nil {
+			panic(err)
+		}
+	}()
+
+	global.SetLoggerProvider(provider)
+
+	// From here, the provider can be used by instrumentation to collect
+	// telemetry.
+}
+
+// Demonstrates how to configure the exporter using self-signed certificates for mutual TLS (mTLS) connections.
+func Example_selfSignedCertificates_mTLS() {
+	// Variables provided by the user.
+	var (
+		caFile     string // The filepath to the server's CA certificate.
+		clientCert string // The filepath to the client's certificate.
+		clientKey  string // The filepath to the client's private key.
+	)
+
+	ctx := context.Background()
+
+	// Configure mTLS connection.
+	tlsCfg := tls.Config{}
+	pool := x509.NewCertPool()
+	data, err := os.ReadFile(caFile)
+	if err != nil {
+		panic(err)
+	}
+	if !pool.AppendCertsFromPEM(data) {
+		panic(errors.New("failed to add CA certificate to root CA pool"))
+	}
+	tlsCfg.RootCAs = pool
+	keypair, err := tls.LoadX509KeyPair(clientCert, clientKey)
+	if err != nil {
+		panic(err)
+	}
+	tlsCfg.Certificates = []tls.Certificate{keypair}
+	creds := credentials.NewTLS(&tlsCfg)
+	exp, err := otlploggrpc.New(ctx, otlploggrpc.WithTLSCredentials(creds))
+	if err != nil {
+		panic(err)
+	}
+
+	processor := log.NewBatchProcessor(exp)
+	provider := log.NewLoggerProvider(log.WithProcessor(processor))
+	defer func() {
+		if err := provider.Shutdown(ctx); err != nil {
+			panic(err)
+		}
+	}()
+
+	global.SetLoggerProvider(provider)
+
+	// From here, the provider can be used by instrumentation to collect
+	// telemetry.
+}