| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF 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.apache.servicecomb.tracing.zipkin; |
| |
| import org.apache.commons.lang3.StringUtils; |
| import org.apache.servicecomb.core.Const; |
| import org.apache.servicecomb.core.Invocation; |
| import org.apache.servicecomb.swagger.invocation.Response; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import brave.Span; |
| import brave.Tracing; |
| import brave.http.HttpServerRequest; |
| import brave.http.HttpServerResponse; |
| import brave.http.HttpServerHandler; |
| import brave.http.HttpTracing; |
| import brave.propagation.Propagation.Getter; |
| import brave.propagation.TraceContext.Extractor; |
| |
| class ZipkinProviderDelegate implements ZipkinTracingDelegate { |
| private static final Logger LOG = LoggerFactory.getLogger(ZipkinProviderDelegate.class); |
| |
| private final HttpServerHandler<HttpServerRequest, HttpServerResponse> handler; |
| |
| private final HttpTracing httpTracing; |
| |
| private final Extractor<Invocation> extractor; |
| |
| private final HttpServeRequestWrapper requestWrapper; |
| |
| private final HttpServerResponseWrapper responseWrapper; |
| |
| public static final String SPAN_ID_HEADER_NAME = "X-B3-SpanId"; |
| |
| public static final String TRACE_ID_HEADER_NAME = Const.TRACE_ID_NAME; |
| |
| private static final Getter<Invocation, String> INVOCATION_STRING_GETTER = (invocation, key) -> { |
| String extracted = invocation.getContext().get(key); |
| if (StringUtils.isEmpty(extracted) && SPAN_ID_HEADER_NAME.equals(key)) { |
| // use traceId as spanId to avoid brave's recreating traceId |
| extracted = invocation.getContext().get(TRACE_ID_HEADER_NAME); |
| LOG.debug("try to extract X-B3-SpanId, but the value is empty, replace with TraceId = [{}]", extracted); |
| } |
| return extracted; |
| }; |
| |
| ZipkinProviderDelegate(HttpTracing httpTracing) { |
| this.httpTracing = httpTracing; |
| this.extractor = httpTracing.tracing().propagation().extractor(extractor()); |
| this.handler = HttpServerHandler.create(httpTracing); |
| this.requestWrapper = new HttpServeRequestWrapper(); |
| this.responseWrapper = new HttpServerResponseWrapper(); |
| } |
| |
| @Override |
| public Tracing tracer() { |
| return httpTracing.tracing(); |
| } |
| |
| @Override |
| public Span createSpan(Invocation invocation) { |
| return handler.handleReceive(requestWrapper.invocation(invocation)); |
| } |
| |
| @Override |
| public void onResponse(Span span, Response response, Throwable error) { |
| handler.handleSend(responseWrapper.response(response).error(error).request(requestWrapper), span); |
| } |
| |
| @Override |
| public String name() { |
| return "Zipkin provider"; |
| } |
| |
| private Getter<Invocation, String> extractor() { |
| return INVOCATION_STRING_GETTER; |
| } |
| } |