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TraceLoggingEventEnhancer.java
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TraceLoggingEventEnhancer.java
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/*
* Copyright 2020 Google LLC
*
* 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.google.cloud.logging.logback;
import ch.qos.logback.classic.spi.ILoggingEvent;
import com.google.cloud.logging.LogEntry;
import org.slf4j.MDC;
/** Adds support for grouping logs by incoming http request */
public class TraceLoggingEventEnhancer implements LoggingEventEnhancer {
// A key used by Cloud Logging for trace Id
private static final String TRACE_ID = "logging.googleapis.trace";
/**
* Set the Trace ID associated with any logging done by the current thread.
*
* @param id The traceID, in the form projects/[PROJECT_ID]/traces/[TRACE_ID]
*/
public static void setCurrentTraceId(String id) {
MDC.put(TRACE_ID, id);
}
/** Clearing a trace Id from the MDC */
public static void clearTraceId() {
MDC.remove(TRACE_ID);
}
/**
* Get the Trace ID associated with any logging done by the current thread.
*
* @return id The traceID
*/
public static String getCurrentTraceId() {
return MDC.get(TRACE_ID);
}
@Override
public void enhanceLogEntry(LogEntry.Builder builder, ILoggingEvent e) {
Object value = e.getMDCPropertyMap().get(TRACE_ID);
String traceId = value != null ? value.toString() : null;
if (traceId != null) {
builder.setTrace(traceId);
}
}
}