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TracingRequestInterceptor.java
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TracingRequestInterceptor.java
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/*
* Copyright (c) 2016, Uber Technologies, Inc
*
* 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 com.uber.jaeger.httpclient;
import io.opentracing.Span;
import io.opentracing.Tracer;
import java.io.IOException;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.protocol.HttpContext;
/**
* Apache http client request interceptor This is designed to be used along with
* {@link TracingResponseInterceptor} to report tracing information.
*
* In most cases you shouldn't be using this directly. Use the appropriate client builder from
* {@link TracingInterceptors}
*
*/
@Slf4j
public class TracingRequestInterceptor implements HttpRequestInterceptor {
private final SpanCreationRequestInterceptor spanCreationInterceptor;
private final SpanInjectionRequestInterceptor spanInjectionInterceptor;
private final Tracer tracer;
public TracingRequestInterceptor(Tracer tracer) {
this.spanCreationInterceptor = new SpanCreationRequestInterceptor(tracer);
this.spanInjectionInterceptor = new SpanInjectionRequestInterceptor(tracer);
this.tracer = tracer;
}
@Override
public void process(HttpRequest httpRequest, HttpContext httpContext)
throws HttpException, IOException {
try {
spanCreationInterceptor.process(httpRequest, httpContext);
Span clientSpan = (Span) httpContext.getAttribute(Constants.CURRENT_SPAN_CONTEXT_KEY);
if (clientSpan != null) {
onSpanStarted(clientSpan, httpRequest, httpContext);
} else {
log.warn("Current client span not found in http context.");
}
spanInjectionInterceptor.process(httpRequest, httpContext);
} catch (Exception e) {
log.error("Could not start client tracing span.", e);
}
}
/**
* onSpanStarted will be called right after the span is created.
* The subclasses can override this method to add additional information
* to the span, including tags and logs.
*
* @param clientSpan - the span that's being created
* @param httpRequest - the http request for the operation
* @param httpContext - the context on which the operation is being executed
*/
protected void onSpanStarted(Span clientSpan, HttpRequest httpRequest, HttpContext httpContext) {
// no-op, can be overriden by subclasses
}
/**
* Get the Span's operation name. Defaults to the HTTP method.
*
* @param httpRequest the request for the http operation being executed
* @return the operation name
*/
protected String getOperationName(HttpRequest httpRequest) {
return httpRequest.getRequestLine().getMethod();
}
}