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co.elastic.logging.log4j2.EcsLayout Maven / Gradle / Ivy
/*-
* #%L
* Java ECS logging
* %%
* Copyright (C) 2019 - 2020 Elastic and contributors
* %%
* Licensed to Elasticsearch B.V. under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch B.V. 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.
* #L%
*/
package co.elastic.logging.log4j2;
import co.elastic.logging.EcsJsonSerializer;
import co.elastic.logging.JsonUtils;
import org.apache.logging.log4j.Marker;
import org.apache.logging.log4j.ThreadContext;
import org.apache.logging.log4j.core.Layout;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.Node;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.config.plugins.PluginBuilderAttribute;
import org.apache.logging.log4j.core.config.plugins.PluginBuilderFactory;
import org.apache.logging.log4j.core.config.plugins.PluginConfiguration;
import org.apache.logging.log4j.core.config.plugins.PluginElement;
import org.apache.logging.log4j.core.layout.AbstractStringLayout;
import org.apache.logging.log4j.core.layout.ByteBufferDestination;
import org.apache.logging.log4j.core.layout.Encoder;
import org.apache.logging.log4j.core.layout.PatternLayout;
import org.apache.logging.log4j.core.lookup.StrSubstitutor;
import org.apache.logging.log4j.core.pattern.PatternFormatter;
import org.apache.logging.log4j.core.util.KeyValuePair;
import org.apache.logging.log4j.message.Message;
import org.apache.logging.log4j.message.MultiformatMessage;
import org.apache.logging.log4j.message.ObjectMessage;
import org.apache.logging.log4j.util.PropertiesUtil;
import org.apache.logging.log4j.util.StringBuilderFormattable;
import java.nio.charset.Charset;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
@Plugin(name = "EcsLayout", category = Node.CATEGORY, elementType = Layout.ELEMENT_TYPE)
public class EcsLayout extends AbstractStringLayout {
public static final Charset UTF_8 = Charset.forName("UTF-8");
private static final ObjectMessageJacksonSerializer JACKSON_SERIALIZER = ObjectMessageJacksonSerializer.Resolver.resolve();
private static final MdcSerializer MDC_SERIALIZER = MdcSerializer.Resolver.resolve();
private static final MultiFormatHandler MULTI_FORMAT_HANDLER = MultiFormatHandler.Resolver.resolve();
private static final boolean FORMAT_MESSAGES_PATTERN_DISABLE_LOOKUPS = PropertiesUtil.getProperties().getBooleanProperty(
"log4j2.formatMsgNoLookups", false);
private final KeyValuePair[] additionalFields;
private final PatternFormatter[][] fieldValuePatternFormatter;
private final boolean stackTraceAsArray;
private final String serviceName;
private final String serviceNodeName;
private final String eventDataset;
private final boolean includeMarkers;
private final boolean includeOrigin;
private final ConcurrentMap, Boolean> supportsJson = new ConcurrentHashMap, Boolean>();
private EcsLayout(Configuration config, String serviceName, String serviceNodeName, String eventDataset, boolean includeMarkers,
KeyValuePair[] additionalFields, boolean includeOrigin, boolean stackTraceAsArray) {
super(config, UTF_8, null, null);
this.serviceName = serviceName;
this.serviceNodeName = serviceNodeName;
this.eventDataset = eventDataset;
this.includeMarkers = includeMarkers;
this.includeOrigin = includeOrigin;
this.stackTraceAsArray = stackTraceAsArray;
this.additionalFields = additionalFields;
fieldValuePatternFormatter = new PatternFormatter[additionalFields.length][];
for (int i = 0; i < additionalFields.length; i++) {
KeyValuePair additionalField = additionalFields[i];
if (additionalField.getValue().contains("%")) {
fieldValuePatternFormatter[i] = PatternLayout.createPatternParser(config)
.parse(additionalField.getValue())
.toArray(new PatternFormatter[0]);
}
}
}
@PluginBuilderFactory
public static EcsLayout.Builder newBuilder() {
return new EcsLayout.Builder();
}
private static boolean valueNeedsLookup(final String value) {
return value != null && value.contains("${");
}
@Override
public String toSerializable(LogEvent event) {
final StringBuilder text = toText(event, getStringBuilder(), false);
return text.toString();
}
@Override
public void encode(LogEvent event, ByteBufferDestination destination) {
final StringBuilder text = toText(event, getStringBuilder(), true);
final Encoder helper = getStringBuilderEncoder();
helper.encode(text, destination);
}
@Override
public String getContentType() {
return "application/json";
}
private StringBuilder toText(LogEvent event, StringBuilder builder, boolean gcFree) {
EcsJsonSerializer.serializeObjectStart(builder, event.getTimeMillis());
EcsJsonSerializer.serializeLogLevel(builder, event.getLevel().toString());
serializeMessage(builder, gcFree, event.getMessage(), event.getThrown());
EcsJsonSerializer.serializeEcsVersion(builder);
EcsJsonSerializer.serializeServiceName(builder, serviceName);
EcsJsonSerializer.serializeServiceNodeName(builder, serviceNodeName);
EcsJsonSerializer.serializeEventDataset(builder, eventDataset);
EcsJsonSerializer.serializeThreadName(builder, event.getThreadName());
EcsJsonSerializer.serializeLoggerName(builder, event.getLoggerName());
serializeAdditionalFieldsAndMDC(event, builder);
serializeTags(event, builder);
if (includeOrigin) {
EcsJsonSerializer.serializeOrigin(builder, event.getSource());
}
EcsJsonSerializer.serializeException(builder, event.getThrown(), stackTraceAsArray);
EcsJsonSerializer.serializeObjectEnd(builder);
return builder;
}
private void serializeAdditionalFieldsAndMDC(LogEvent event, StringBuilder builder) {
final int length = additionalFields.length;
if (length > 0) {
final StrSubstitutor strSubstitutor = getConfiguration().getStrSubstitutor();
for (int i = 0; i < length; i++) {
KeyValuePair additionalField = additionalFields[i];
PatternFormatter[] formatters = fieldValuePatternFormatter[i];
CharSequence value = null;
if (formatters != null) {
StringBuilder buffer = EcsJsonSerializer.getMessageStringBuilder();
formatPattern(event, formatters, buffer);
if (buffer.length() > 0) {
value = buffer;
}
} else if (valueNeedsLookup(additionalField.getValue()) && !FORMAT_MESSAGES_PATTERN_DISABLE_LOOKUPS) {
StringBuilder lookupValue = EcsJsonSerializer.getMessageStringBuilder();
lookupValue.append(additionalField.getValue());
if (strSubstitutor.replaceIn(event, lookupValue)) {
value = lookupValue;
}
} else {
value = additionalField.getValue();
}
if (value != null) {
builder.append('\"');
JsonUtils.quoteAsString(additionalField.getKey(), builder);
builder.append("\":\"");
JsonUtils.quoteAsString(EcsJsonSerializer.toNullSafeString(value), builder);
builder.append("\",");
}
}
}
MDC_SERIALIZER.serializeMdc(event, builder);
}
private static void formatPattern(LogEvent event, PatternFormatter[] formatters, StringBuilder buffer) {
final int len = formatters.length;
for (int i = 0; i < len; i++) {
formatters[i].format(event, buffer);
}
}
private void serializeTags(LogEvent event, StringBuilder builder) {
ThreadContext.ContextStack stack = event.getContextStack();
List contextStack;
if (stack == null) {
contextStack = Collections.emptyList();
} else {
contextStack = stack.asList();
}
Marker marker = event.getMarker();
boolean hasTags = !contextStack.isEmpty() || (includeMarkers && marker != null);
if (hasTags) {
EcsJsonSerializer.serializeTagStart(builder);
}
if (!contextStack.isEmpty()) {
final int len = contextStack.size();
for (int i = 0; i < len; i++) {
builder.append('\"');
JsonUtils.quoteAsString(contextStack.get(i), builder);
builder.append("\",");
}
}
if (includeMarkers && marker != null) {
serializeMarker(builder, marker);
}
if (hasTags) {
EcsJsonSerializer.serializeTagEnd(builder);
}
}
private void serializeMarker(StringBuilder builder, Marker marker) {
EcsJsonSerializer.serializeSingleTag(builder, marker.getName());
if (marker.hasParents()) {
Marker[] parents = marker.getParents();
for (int i = 0; i < parents.length; i++) {
serializeMarker(builder, parents[i]);
}
}
}
private void serializeMessage(StringBuilder builder, boolean gcFree, Message message, Throwable thrown) {
if (message instanceof MultiformatMessage) {
MultiformatMessage multiformatMessage = (MultiformatMessage) message;
if (supportsJson(multiformatMessage)) {
serializeJsonMessage(builder, multiformatMessage);
} else {
serializeSimpleMessage(builder, gcFree, message, thrown);
}
} else if (JACKSON_SERIALIZER != null && message instanceof ObjectMessage) {
final StringBuilder jsonBuffer = EcsJsonSerializer.getMessageStringBuilder();
JACKSON_SERIALIZER.formatTo(jsonBuffer, (ObjectMessage) message);
addJson(builder, jsonBuffer);
} else {
serializeSimpleMessage(builder, gcFree, message, thrown);
}
}
private static void serializeJsonMessage(StringBuilder builder, MultiformatMessage message) {
final StringBuilder messageBuffer = EcsJsonSerializer.getMessageStringBuilder();
MULTI_FORMAT_HANDLER.formatJsonTo(message, messageBuffer);
addJson(builder, messageBuffer);
}
private static void addJson(StringBuilder buffer, StringBuilder jsonBuffer) {
if (isObject(jsonBuffer)) {
moveToRoot(jsonBuffer);
buffer.append(jsonBuffer);
buffer.append(", ");
} else {
buffer.append("\"message\":");
if (isString(jsonBuffer)) {
buffer.append(jsonBuffer);
} else {
// message always has to be a string to avoid mapping conflicts
buffer.append('"');
JsonUtils.quoteAsString(jsonBuffer, buffer);
buffer.append('"');
}
buffer.append(", ");
}
}
private void serializeSimpleMessage(StringBuilder builder, boolean gcFree, Message message, Throwable thrown) {
builder.append("\"message\":\"");
if (message instanceof CharSequence) {
JsonUtils.quoteAsString(((CharSequence) message), builder);
} else if (gcFree && message instanceof StringBuilderFormattable) {
final StringBuilder messageBuffer = EcsJsonSerializer.getMessageStringBuilder();
try {
((StringBuilderFormattable) message).formatTo(messageBuffer);
JsonUtils.quoteAsString(messageBuffer, builder);
} finally {
trimToMaxSizeCopy(messageBuffer);
}
} else {
JsonUtils.quoteAsString(EcsJsonSerializer.toNullSafeString(message.getFormattedMessage()), builder);
}
builder.append("\", ");
}
static void trimToMaxSizeCopy(final StringBuilder stringBuilder) {
if (stringBuilder.length() > MAX_STRING_BUILDER_SIZE) {
stringBuilder.setLength(MAX_STRING_BUILDER_SIZE);
stringBuilder.trimToSize();
}
}
private static boolean isObject(StringBuilder messageBuffer) {
return messageBuffer.length() > 1 && messageBuffer.charAt(0) == '{' && messageBuffer.charAt(messageBuffer.length() - 1) == '}';
}
private static boolean isString(StringBuilder messageBuffer) {
return messageBuffer.length() > 1 && messageBuffer.charAt(0) == '"' && messageBuffer.charAt(messageBuffer.length() - 1) == '"';
}
private static void moveToRoot(StringBuilder messageBuffer) {
messageBuffer.setCharAt(0, ' ');
messageBuffer.setCharAt(messageBuffer.length() -1, ' ');
}
private boolean supportsJson(MultiformatMessage message) {
Boolean supportsJson = this.supportsJson.get(message.getClass());
if (supportsJson == null) {
supportsJson = false;
for (String format : message.getFormats()) {
if (format.equalsIgnoreCase("JSON")) {
supportsJson = true;
break;
}
}
this.supportsJson.put(message.getClass(), supportsJson);
}
return supportsJson;
}
public static class Builder implements org.apache.logging.log4j.core.util.Builder {
@PluginConfiguration
private Configuration configuration;
@PluginBuilderAttribute("serviceName")
private String serviceName;
@PluginBuilderAttribute("serviceNodeName")
private String serviceNodeName;
@PluginBuilderAttribute("eventDataset")
private String eventDataset;
@PluginBuilderAttribute("includeMarkers")
private boolean includeMarkers = false;
@PluginBuilderAttribute("stackTraceAsArray")
private boolean stackTraceAsArray = false;
@PluginElement("AdditionalField")
private KeyValuePair[] additionalFields = new KeyValuePair[]{};
@PluginBuilderAttribute("includeOrigin")
private boolean includeOrigin = false;
Builder() {
}
public Configuration getConfiguration() {
return configuration;
}
public EcsLayout.Builder setConfiguration(final Configuration configuration) {
this.configuration = configuration;
return this;
}
public KeyValuePair[] getAdditionalFields() {
return additionalFields.clone();
}
public String getServiceName() {
return serviceName;
}
public String getServiceNodeName() {
return serviceNodeName;
}
public String getEventDataset() {
return eventDataset;
}
public boolean isIncludeMarkers() {
return includeMarkers;
}
public boolean isIncludeOrigin() {
return includeOrigin;
}
/**
* Additional fields to set on each log event.
*
* @return this builder
*/
public EcsLayout.Builder setAdditionalFields(final KeyValuePair[] additionalFields) {
this.additionalFields = additionalFields.clone();
return this;
}
public EcsLayout.Builder setServiceName(final String serviceName) {
this.serviceName = serviceName;
return this;
}
public EcsLayout.Builder setServiceNodeName(final String serviceNodeName) {
this.serviceNodeName = serviceNodeName;
return this;
}
public EcsLayout.Builder setEventDataset(String eventDataset) {
this.eventDataset = eventDataset;
return this;
}
public EcsLayout.Builder setIncludeMarkers(final boolean includeMarkers) {
this.includeMarkers = includeMarkers;
return this;
}
public EcsLayout.Builder setIncludeOrigin(final boolean includeOrigin) {
this.includeOrigin = includeOrigin;
return this;
}
public EcsLayout.Builder setStackTraceAsArray(boolean stackTraceAsArray) {
this.stackTraceAsArray = stackTraceAsArray;
return this;
}
@Override
public EcsLayout build() {
return new EcsLayout(getConfiguration(), serviceName, serviceNodeName, EcsJsonSerializer.computeEventDataset(eventDataset, serviceName),
includeMarkers, additionalFields, includeOrigin, stackTraceAsArray);
}
public boolean isStackTraceAsArray() {
return stackTraceAsArray;
}
}
}
