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OpenTelemetryTracer.java
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OpenTelemetryTracer.java
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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The SFC licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package org.openqa.selenium.remote.tracing.opentelemetry;
import io.opentelemetry.api.trace.Tracer;
import io.opentelemetry.context.Context;
import io.opentelemetry.context.propagation.TextMapPropagator;
import io.opentelemetry.sdk.OpenTelemetrySdk;
import io.opentelemetry.sdk.autoconfigure.OpenTelemetrySdkAutoConfiguration;
import org.openqa.selenium.internal.Require;
import org.openqa.selenium.remote.tracing.Propagator;
import org.openqa.selenium.remote.tracing.TraceContext;
import java.util.logging.Logger;
public class OpenTelemetryTracer implements org.openqa.selenium.remote.tracing.Tracer {
private static final Logger LOG = Logger.getLogger(OpenTelemetryTracer.class.getName());
// We obtain the underlying tracer instance from the singleton instance
// that OpenTelemetry maintains. If we blindly grabbed the tracing provider
// and configured it, then subsequent calls would add duplicate exporters.
// To avoid this, stash the configured tracer on a static and weep for
// humanity. This implies that we're never going to need to configure
// tracing more than once for the entire JVM, so we're never going to be
// adding unit tests for this.
private static volatile OpenTelemetryTracer singleton;
public static OpenTelemetryTracer getInstance() {
OpenTelemetryTracer localTracer = singleton;
if (localTracer == null) {
synchronized (OpenTelemetryTracer.class) {
localTracer = singleton;
if (localTracer == null) {
localTracer = createTracer();
singleton = localTracer;
}
}
}
return localTracer;
}
private static OpenTelemetryTracer createTracer() {
LOG.info("Using OpenTelemetry for tracing");
// Default exporter for traces and metrics is OTLP 0.17.0 onwards.
// If the metrics exporter property is not set to none, external dependency is required.
System.setProperty("otel.metrics.exporter", "none");
String exporter = System.getProperty("otel.traces.exporter");
if(exporter == null) {
System.setProperty("otel.traces.exporter", "none");
}
OpenTelemetrySdk autoConfiguredSdk = OpenTelemetrySdkAutoConfiguration.initialize();
return new OpenTelemetryTracer(
autoConfiguredSdk.getTracer("default"),
autoConfiguredSdk.getPropagators().getTextMapPropagator());
}
private final Tracer tracer;
private final OpenTelemetryPropagator telemetryPropagator;
public OpenTelemetryTracer(Tracer tracer, TextMapPropagator propagator) {
this.tracer = Require.nonNull("Tracer", tracer);
this.telemetryPropagator = new OpenTelemetryPropagator(
tracer,
Require.nonNull("Formatter", propagator));
}
@Override
public TraceContext getCurrentContext() {
return new OpenTelemetryContext(tracer, Context.current());
}
@Override
public Propagator getPropagator() {
return telemetryPropagator;
}
}