add otel module based on uptrace-go

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

otel/logging.go

@@ -0,0 +1,64 @@
+package otel
+
+import (
+	"context"
+	"time"
+
+	"go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp"
+	"go.opentelemetry.io/otel/log/global"
+	sdklog "go.opentelemetry.io/otel/sdk/log"
+)
+
+func configureLogging(ctx context.Context, conf *config) *sdklog.LoggerProvider {
+	var opts []sdklog.LoggerProviderOption
+	if res := conf.newResource(); res != nil {
+		opts = append(opts, sdklog.WithResource(res))
+	}
+
+	for _, dsn := range conf.dsn {
+		dsn, err := ParseDSN(dsn)
+		if err != nil {
+			log.WithError(err).Error("ParseDSN failed")
+			continue
+		}
+
+		exp, err := newOtlpLogExporter(ctx, conf, dsn)
+		if err != nil {
+			log.WithError(err).Error("otlploghttp.New failed")
+			continue
+		}
+
+		queueSize := queueSize()
+		bspOptions := []sdklog.BatchProcessorOption{
+			sdklog.WithMaxQueueSize(queueSize),
+			sdklog.WithExportMaxBatchSize(queueSize),
+			sdklog.WithExportInterval(10 * time.Second),
+			sdklog.WithExportTimeout(10 * time.Second),
+		}
+		bsp := sdklog.NewBatchProcessor(exp, bspOptions...)
+		opts = append(opts, sdklog.WithProcessor(bsp))
+	}
+
+	provider := sdklog.NewLoggerProvider(opts...)
+	global.SetLoggerProvider(provider)
+
+	return provider
+}
+
+func newOtlpLogExporter(
+	ctx context.Context, conf *config, dsn *DSN,
+) (*otlploghttp.Exporter, error) {
+	options := []otlploghttp.Option{
+		otlploghttp.WithEndpoint(dsn.OTLPHttpEndpoint()),
+		otlploghttp.WithHeaders(dsn.Headers()),
+		otlploghttp.WithCompression(otlploghttp.GzipCompression),
+	}
+
+	if conf.tlsConf != nil {
+		options = append(options, otlploghttp.WithTLSClientConfig(conf.tlsConf))
+	} else if dsn.Scheme == "http" {
+		options = append(options, otlploghttp.WithInsecure())
+	}
+
+	return otlploghttp.New(ctx, options...)
+}