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| 1 | +/* |
| 2 | + * Copyright 2012-2024 the original author or authors. |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * https://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | + |
| 17 | +package org.springframework.boot.actuate.autoconfigure.tracing.otlp; |
| 18 | + |
| 19 | +import io.micrometer.tracing.otel.bridge.OtelTracer; |
| 20 | +import io.opentelemetry.api.OpenTelemetry; |
| 21 | +import io.opentelemetry.exporter.otlp.http.trace.OtlpHttpSpanExporter; |
| 22 | +import io.opentelemetry.exporter.otlp.trace.OtlpGrpcSpanExporter; |
| 23 | +import io.opentelemetry.sdk.trace.SdkTracerProvider; |
| 24 | + |
| 25 | +import org.springframework.boot.autoconfigure.AutoConfiguration; |
| 26 | +import org.springframework.boot.autoconfigure.EnableAutoConfiguration; |
| 27 | +import org.springframework.boot.autoconfigure.condition.ConditionalOnClass; |
| 28 | +import org.springframework.boot.context.properties.EnableConfigurationProperties; |
| 29 | +import org.springframework.context.annotation.Import; |
| 30 | + |
| 31 | +/** |
| 32 | + * {@link EnableAutoConfiguration Auto-configuration} for exporting traces with OTLP. |
| 33 | + * Brave does not support OTLP, so we only configure it for OpenTelemetry. OTLP defines |
| 34 | + * three transports that are supported: gRPC (/protobuf), HTTP/protobuf, HTTP/JSON. From |
| 35 | + * these transports HTTP/JSON is not supported by the OTel Java SDK, and it seems there |
| 36 | + * are no plans supporting it in the future, see: <a href= |
| 37 | + * "https://github.com/open-telemetry/opentelemetry-java/issues/3651">opentelemetry-java#3651</a>. |
| 38 | + * Because this class configures components from the OTel SDK, it can't support HTTP/JSON. |
| 39 | + * By default, we auto-configure HTTP/protobuf. If you want to use gRPC, you need to set |
| 40 | + * {@code management.otlp.tracing.transport=grpc}. If you define a |
| 41 | + * {@link OtlpHttpSpanExporter} or {@link OtlpGrpcSpanExporter}, this auto-configuration |
| 42 | + * will back off. |
| 43 | + * |
| 44 | + * @author Jonatan Ivanov |
| 45 | + * @author Moritz Halbritter |
| 46 | + * @author Eddú Meléndez |
| 47 | + * @since 3.4.0 |
| 48 | + */ |
| 49 | +@AutoConfiguration |
| 50 | +@ConditionalOnClass({ OtelTracer.class, SdkTracerProvider.class, OpenTelemetry.class, OtlpHttpSpanExporter.class }) |
| 51 | +@EnableConfigurationProperties(OtlpTracingProperties.class) |
| 52 | +@Import({ OtlpTracingConfigurations.ConnectionDetails.class, OtlpTracingConfigurations.Exporters.class }) |
| 53 | +public class OtlpTracingAutoConfiguration { |
| 54 | + |
| 55 | +} |
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