/*
 * Copyright The OpenTelemetry Authors
 *
 * Licensed 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 server

import io.opentelemetry.OpenTelemetry
import io.opentelemetry.trace.Tracer
import org.springframework.http.MediaType
import org.springframework.stereotype.Component
import org.springframework.web.reactive.function.server.ServerRequest
import org.springframework.web.reactive.function.server.ServerResponse
import reactor.core.publisher.Mono

@Component
class EchoHandler {

  private static final Tracer TRACER = OpenTelemetry.getTracer("io.opentelemetry.auto")

  Mono<ServerResponse> echo(ServerRequest request) {
    TRACER.spanBuilder("echo").startSpan().end()
    return ServerResponse.accepted().contentType(MediaType.TEXT_PLAIN)
      .body(request.bodyToMono(String), String)
  }
}