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/**
* 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.hadoop.log;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.MappingJsonFactory;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectReader;
import com.fasterxml.jackson.databind.node.ContainerNode;
import org.apache.log4j.Layout;
import org.apache.log4j.helpers.ISO8601DateFormat;
import org.apache.log4j.spi.LoggingEvent;
import org.apache.log4j.spi.ThrowableInformation;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.text.DateFormat;
import java.util.Date;
/**
* This offers a log layout for JSON, with some test entry points. It's purpose is
* to allow Log4J to generate events that are easy for other programs to parse, but which are somewhat
* human-readable.
*
* Some features.
*
*
*
Every event is a standalone JSON clause
*
Time is published as a time_t event since 1/1/1970
* -this is the fastest to generate.
*
An ISO date is generated, but this is cached and will only be accurate to within a second
*
the stack trace is included as an array
*
*
* A simple log event will resemble the following
*
*/
public class Log4Json extends Layout {
/**
* Jackson factories are thread safe when constructing parsers and generators.
* They are not thread safe in configure methods; if there is to be any
* configuration it must be done in a static initializer block.
*/
private static final JsonFactory factory = new MappingJsonFactory();
private static final ObjectReader READER = new ObjectMapper(factory).reader();
public static final String DATE = "date";
public static final String EXCEPTION_CLASS = "exceptionclass";
public static final String LEVEL = "level";
public static final String MESSAGE = "message";
public static final String NAME = "name";
public static final String STACK = "stack";
public static final String THREAD = "thread";
public static final String TIME = "time";
public static final String JSON_TYPE = "application/json";
private final DateFormat dateFormat;
public Log4Json() {
dateFormat = new ISO8601DateFormat();
}
/**
* @return the mime type of JSON
*/
@Override
public String getContentType() {
return JSON_TYPE;
}
@Override
public String format(LoggingEvent event) {
try {
return toJson(event);
} catch (IOException e) {
//this really should not happen, and rather than throw an exception
//which may hide the real problem, the log class is printed
//in JSON format. The classname is used to ensure valid JSON is
//returned without playing escaping games
return "{ \"logfailure\":\"" + e.getClass().toString() + "\"}";
}
}
/**
* Convert an event to JSON
*
* @param event the event -must not be null
* @return a string value
* @throws IOException on problems generating the JSON
*/
public String toJson(LoggingEvent event) throws IOException {
StringWriter writer = new StringWriter();
toJson(writer, event);
return writer.toString();
}
/**
* Convert an event to JSON
*
* @param writer the destination writer
* @param event the event -must not be null
* @return the writer
* @throws IOException on problems generating the JSON
*/
public Writer toJson(final Writer writer, final LoggingEvent event)
throws IOException {
ThrowableInformation ti = event.getThrowableInformation();
toJson(writer,
event.getLoggerName(),
event.getTimeStamp(),
event.getLevel().toString(),
event.getThreadName(),
event.getRenderedMessage(),
ti);
return writer;
}
/**
* Build a JSON entry from the parameters. This is public for testing.
*
* @param writer destination
* @param loggerName logger name
* @param timeStamp time_t value
* @param level level string
* @param threadName name of the thread
* @param message rendered message
* @param ti nullable thrown information
* @return the writer
* @throws IOException on any problem
*/
public Writer toJson(final Writer writer,
final String loggerName,
final long timeStamp,
final String level,
final String threadName,
final String message,
final ThrowableInformation ti) throws IOException {
JsonGenerator json = factory.createGenerator(writer);
json.writeStartObject();
json.writeStringField(NAME, loggerName);
json.writeNumberField(TIME, timeStamp);
Date date = new Date(timeStamp);
json.writeStringField(DATE, dateFormat.format(date));
json.writeStringField(LEVEL, level);
json.writeStringField(THREAD, threadName);
json.writeStringField(MESSAGE, message);
if (ti != null) {
//there is some throwable info, but if the log event has been sent over the wire,
//there may not be a throwable inside it, just a summary.
Throwable thrown = ti.getThrowable();
String eclass = (thrown != null) ?
thrown.getClass().getName()
: "";
json.writeStringField(EXCEPTION_CLASS, eclass);
String[] stackTrace = ti.getThrowableStrRep();
json.writeArrayFieldStart(STACK);
for (String row : stackTrace) {
json.writeString(row);
}
json.writeEndArray();
}
json.writeEndObject();
json.flush();
json.close();
return writer;
}
/**
* This appender does not ignore throwables
*
* @return false, always
*/
@Override
public boolean ignoresThrowable() {
return false;
}
/**
* Do nothing
*/
@Override
public void activateOptions() {
}
/**
* For use in tests
*
* @param json incoming JSON to parse
* @return a node tree
* @throws IOException on any parsing problems
*/
public static ContainerNode parse(String json) throws IOException {
JsonNode jsonNode = READER.readTree(json);
if (!(jsonNode instanceof ContainerNode)) {
throw new IOException("Wrong JSON data: " + json);
}
return (ContainerNode) jsonNode;
}
}
