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/* Copyright 2023 predic8 GmbH, www.predic8.com
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.predic8.membrane.core.interceptor.log;
import com.predic8.membrane.core.exchange.Exchange;
import com.predic8.membrane.core.http.*;
import com.predic8.membrane.core.lang.spel.ExchangeEvaluationContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.MDC;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.AbstractMap;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Collectors;
public class AccessLogInterceptorService {
private static final Logger log = LoggerFactory.getLogger(AccessLogInterceptor.class);
private final SimpleDateFormat dateTimeFormat;
private final String defaultValue;
private final List additionalVariables;
private final boolean excludePayloadSize;
public AccessLogInterceptorService(
String dateTimePattern,
String defaultValue,
List additionalVariables,
boolean excludePayloadSize
) {
this.dateTimeFormat = new SimpleDateFormat(dateTimePattern);
this.defaultValue = defaultValue;
this.additionalVariables = additionalVariables;
this.excludePayloadSize = excludePayloadSize;
}
/**
* Handles access logging with custom MDC parameters
* MDC often uses ThreadLocals to archive thread safety.
* Using thread pools and reusing borrowed threads could lead to leftover MDC data
* to be thread pool safe, we simply clear the MDC after usage
*
* @param exc - The HTTP exchange
*/
public void handleAccessLogging(Exchange exc) {
MDC.setContextMap(generateMDCMap(exc));
log.info("");
MDC.clear();
}
private Map generateMDCMap(Exchange exc) {
var ctx = new HashMap<>(getBaseProperties(exc));
ctx.putAll(getTimeProperties(exc));
ctx.putAll(getTimeProperties2(exc));
if (!excludePayloadSize) {
ctx.put("req.payload.size", safe(getPayLoadSize(exc.getRequest())));
ctx.put("res.payload.size", safe(getPayLoadSize(exc.getResponse())));
}
ctx.putAll(getAdditionalProvidedPattern(exc));
return ctx;
}
private Map getTimeProperties2(Exchange exc) {
return Map.of(
"time.diff.received.raw", safe(() -> exc.getTimeResReceived() - exc.getTimeReqReceived()),
"time.diff.received.format", convert(safe(() -> exc.getTimeResReceived() - exc.getTimeReqReceived())),
"time.diff.sent.raw", safe(() -> exc.getTimeResSent() - exc.getTimeReqSent()),
"time.diff.sent.format", convert(safe(() -> exc.getTimeResSent() - exc.getTimeReqSent()))
);
}
private Map getTimeProperties(Exchange exc) {
return Map.of(
"time.req.received.raw", safe(exc::getTimeReqReceived),
"time.req.received.format", convert(safe(exc::getTimeReqReceived)),
"time.req.sent.raw", safe(exc::getTimeReqSent),
"time.req.sent.format", convert(safe(exc::getTimeReqSent)),
"time.res.received.raw", safe(exc::getTimeResReceived),
"time.res.received.format", convert(safe(exc::getTimeResReceived)),
"time.res.sent.raw", safe(exc::getTimeResSent),
"time.res.sent.format", convert(safe(exc::getTimeResSent))
);
}
private Map getBaseProperties(Exchange exc) {
return Map.of(
"ip", safe(exc::getRemoteAddrIp),
"host", safe(exc::getOriginalHostHeaderHost),
"port", safe(exc::getOriginalHostHeaderPort),
"uri", safe(exc::getOriginalRequestUri),
"proto", safe(() -> exc.getRequest().getHeader().getFirstValue("x-forwarded-proto").toUpperCase()),
"http.version", safe(() -> exc.getRequest().getVersion()),
"http.method", safe(() -> exc.getRequest().getMethod()),
"statusCode", safe(() -> exc.getResponse().getStatusCode())
);
}
private Supplier
