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a EventDeserializer for spooldir #76

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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.flume.serialization;

import java.io.IOException;
import java.nio.charset.Charset;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.flume.Context;
import org.apache.flume.Event;
import org.apache.flume.annotations.InterfaceAudience;
import org.apache.flume.annotations.InterfaceStability;
import org.apache.flume.event.EventBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.Lists;

/**
* A deserializer that parses text lines from a file.
* matching line/multiLine against the regular expression.
*/
@InterfaceAudience.Private
@InterfaceStability.Evolving
public class RegexLineDeserializer implements EventDeserializer {

private static final Logger logger = LoggerFactory.getLogger(RegexLineDeserializer.class);

private final ResettableInputStream in;
private final Charset outputCharset;
private volatile boolean isOpen;

public static final String OUT_CHARSET_KEY = "outputCharset";
public static final String CHARSET_DFLT = "UTF-8";

// matching line/multiLine against the regular expression
public static final String FILE_PATTERN_KEY = "filePattern";
private Pattern pattern;

RegexLineDeserializer(Context context, ResettableInputStream in) {
this.in = in;
this.outputCharset = Charset.forName(
context.getString(OUT_CHARSET_KEY, CHARSET_DFLT));
this.isOpen = true;

// regular expressions
String filePattern = context.getString(FILE_PATTERN_KEY, "");
if (null != filePattern && !"".equals(filePattern)) {
this.pattern = Pattern.compile(filePattern, Pattern.DOTALL);
}
}

/**
* Reads a line from a file and returns an event
* @return Event containing parsed line
* @throws IOException
*/
@Override
public Event readEvent() throws IOException {
ensureOpen();

if (null != pattern) {
String multiLine = readLineRegex();
if (null == multiLine || "".equals(multiLine)) {
return null;
} else {
return EventBuilder.withBody(multiLine, outputCharset);
}
}

String line = readLine();
if (line == null) {
return null;
} else {
return EventBuilder.withBody(line, outputCharset);
}
}

/**
* Batch line read
* @param numEvents Maximum number of events to return.
* @return List of events containing read lines
* @throws IOException
*/
@Override
public List<Event> readEvents(int numEvents) throws IOException {
ensureOpen();
List<Event> events = Lists.newLinkedList();
for (int i = 0; i < numEvents; i++) {
Event event = readEvent();
if (event != null) {
events.add(event);
} else {
break;
}
}
return events;
}

@Override
public void mark() throws IOException {
ensureOpen();
in.mark();
}

@Override
public void reset() throws IOException {
ensureOpen();
in.reset();
}

@Override
public void close() throws IOException {
if (isOpen) {
reset();
in.close();
isOpen = false;
}
}

private void ensureOpen() {
if (!isOpen) {
throw new IllegalStateException("Serializer has been closed");
}
}

// TODO: consider not returning a final character that is a high surrogate
// when truncating
private String readLine() throws IOException {
StringBuilder sb = new StringBuilder();
int c;
int readChars = 0;
while ((c = in.readChar()) != -1) {
readChars++;

// FIXME: support \r\n
if (c == '\n') {
break;
}

sb.append((char)c);
}

if (readChars > 0) {
return sb.toString();
} else {
return null;
}
}

private String readLineRegex() throws IOException {
StringBuilder sb = new StringBuilder();
StringBuilder multiSb = new StringBuilder();
Matcher matcher;
int c;
boolean hasRegex = false;
long nextLineStart = in.tell();
boolean isLastLine = true;
while ((c = in.readChar()) != -1) {
// FIXME: support \r\n
if (c == 65279) {
continue;
}
if (c == '\n') {
matcher = pattern.matcher(sb.toString());
if (matcher.matches()) {
if (hasRegex) {
in.seek(nextLineStart);
sb = new StringBuilder();
isLastLine = false;
break;
}
hasRegex = true;
multiSb = new StringBuilder();
}
if (sb.toString() != null && !"".equals(sb.toString())) {
multiSb.append(sb).append((char) c);
}
sb = new StringBuilder();
nextLineStart = in.tell();
} else {
sb.append((char) c);
}
}

// last line
if (isLastLine && hasRegex) {
if (sb.toString() != null || !"".equals(sb.toString())) {
matcher = pattern.matcher(sb.toString());
// matched or not
if (matcher.matches()) {
// first line
in.seek(nextLineStart);
sb = new StringBuilder();
} else {
multiSb.append(sb);
}
}
}
String multiLine = multiSb.toString();
if (multiLine != null && !"".equals(multiLine)) {
if (multiSb.lastIndexOf("\n") == multiSb.length() - 1 && multiSb.length() > 1) {
multiLine = multiLine.substring(0, multiSb.length() - 1);
}
return multiLine;
} else {
// last line
if (sb.toString() != null || !"".equals(sb.toString())) {
matcher = pattern.matcher(sb.toString());
if (matcher.matches()) {
return sb.toString();
}
}
return null;
}
}

public static class Builder implements EventDeserializer.Builder {

@Override
public EventDeserializer build(Context context, ResettableInputStream in) {
return new RegexLineDeserializer(context, in);
}

}

}
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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.flume.serialization;

import java.io.IOException;

import org.apache.flume.Context;
import org.apache.flume.Event;
import org.junit.Before;
import org.junit.Test;

public class TestRegexLineDeserializer {

private String fileInfo;

@Before
public void setup() {
StringBuilder sb = new StringBuilder();
sb.append("2016-10-19 10:19:10,188 INFO - Configuration provider starting");
sb.append("\n");
sb.append("2016-10-19 10:19:10,199 DEBUG - Starting validation of for agent: agent");
sb.append("\n");
sb.append("SOURCES: {s1={ parameters:{decodeErrorPolicy=REPLACE} }}");
sb.append("\n");
sb.append("CHANNELS: {c1={ parameters:{checkpointDir=./agent/checkpoint} }}");
sb.append("\n");
sb.append("SINKS: {k1={ parameters:{clusterName=es, indexType=test4} }}");
sb.append("\n");
sb.append("\n");
sb.append("2016-10-19 10:19:10,204 DEBUG - Created channel c1");
sb.append("\n");
fileInfo = sb.toString();
}

@Test
public void testMultiLine() throws IOException {
// ^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2},\d{3}
// ^((${srcStartWithString})(\\s|\\S)).*
Context context = new Context();
context.put("filePattern", "^((\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2},\\d{3})(\\s|\\S)).*");
ResettableInputStream in = new TestRegexLineInputStream(fileInfo);
EventDeserializer des = new RegexLineDeserializer(context, in);
Event evt = des.readEvent();
String line1 = new String(evt.getBody(), "UTF-8");
System.out.println("line 1\n" + line1);
des.mark();
evt = des.readEvent();
String line2 = new String(evt.getBody(), "UTF-8");
System.out.println("line 2\n" + line2);
des.mark();
evt = des.readEvent();
String line3 = new String(evt.getBody(), "UTF-8");
System.out.println("line 3\n" + line3);
des.reset();
des.mark();
des.close();
}
}
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