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LogsandraSyslogSink.java
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LogsandraSyslogSink.java
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package org.apache.cassandra.plugins;
import java.io.IOException;
import java.util.Calendar;
import java.util.ArrayList;
import java.util.List;
import java.util.TimeZone;
import org.apache.cassandra.thrift.Column;
import org.apache.cassandra.thrift.ConsistencyLevel;
import org.safehaus.uuid.UUID;
import org.safehaus.uuid.UUIDGenerator;
import com.cloudera.flume.conf.Context;
import com.cloudera.flume.conf.SinkFactory.SinkBuilder;
import com.cloudera.flume.core.Event;
import com.cloudera.flume.core.EventSink;
import com.cloudera.util.Pair;
import com.cloudera.flume.handlers.syslog.SyslogConsts;
/**
* Uses Cassandra as a Logsandra compatible sink for syslog messages.
*
* When the sink receives an event, it does the following:
*
* 1. Inserts the entry in to the "entries" column family with
* a version 1 UUID as the row key.
* 2. Using the "by_date" column family, indexes the entry by
* source, severity, and facility.
*
* From there, Logsandra should be able to use the data. You
* can find Logsandra at http://github.com/jbohman/logsandra
*/
public class LogsandraSyslogSink extends EventSink.Base {
private static final String KEYSPACE = "logsandra";
private static final String ENTRIES = "entries";
private static final String BY_DATE = "by_date";
// Column names
private static final byte[] IDENT_NAME = "ident".getBytes();
private static final byte[] SOURCE_NAME = "source".getBytes();
private static final byte[] DATE_NAME = "date".getBytes();
private static final byte[] ENTRY_NAME = "entry".getBytes();
private CassandraClient cClient;
private static final UUIDGenerator uuidGen = UUIDGenerator.getInstance();
private static final long MILLI_TO_MICRO = 1000; // 1ms = 1000us
public LogsandraSyslogSink(String[] servers) {
this.cClient = new CassandraClient(KEYSPACE, servers);
}
@Override
public void open() throws IOException {
this.cClient.open();
}
/**
* Writes the message to Cassandra in a Logsandra compatible way.
*/
@Override
public void append(Event event) throws IOException {
long timestamp = System.currentTimeMillis() * MILLI_TO_MICRO;
UUID uuid = uuidGen.generateTimeBasedUUID();
String date = getDate();
String host = event.getHost();
String facility = SyslogConsts.FACILITY[event.get(SyslogConsts.SYSLOG_FACILITY)[0]];
String severity = SyslogConsts.SEVERITY[event.get(SyslogConsts.SYSLOG_SEVERITY)[0]].toString();
StringBuffer eventInfo = new StringBuffer();
eventInfo.append(date);
eventInfo.append(' ');
eventInfo.append(host);
eventInfo.append(' ');
eventInfo.append(facility);
eventInfo.append(' ');
eventInfo.append(severity);
eventInfo.append(' ');
byte[] eventBody = event.getBody();
byte[] eventInfoBytes = eventInfo.toString().getBytes();
byte[] finalBytes = new byte[eventInfoBytes.length + eventBody.length];
for(int i = 0; i < eventInfoBytes.length; i++) {
finalBytes[i] = eventInfoBytes[i];
}
for(int i = 0; i < eventBody.length; i++) {
finalBytes[i + eventInfoBytes.length] = eventBody[i];
}
Column identColumn = new Column(IDENT_NAME, "ident".getBytes(), timestamp);
Column sourceColumn = new Column(SOURCE_NAME, host.getBytes(), timestamp);
Column dateColumn = new Column(DATE_NAME, date.getBytes(), timestamp);
Column entryColumn = new Column(ENTRY_NAME, finalBytes, timestamp);
Column[] entryColumns = {identColumn, sourceColumn, dateColumn, entryColumn};
Long time = System.currentTimeMillis() * MILLI_TO_MICRO;
Column timeColumn = new Column(toBytes(time), uuid.toString().getBytes(), timestamp);
Column[] byDateColumns = {timeColumn};
// Insert the entry
this.cClient.insert(uuid.toString().getBytes(), ENTRIES, entryColumns, ConsistencyLevel.QUORUM);
// Insert the keyword indexes
this.cClient.insert(
event.getHost().getBytes(),
BY_DATE, byDateColumns, ConsistencyLevel.QUORUM);
this.cClient.insert(
SyslogConsts.FACILITY[event.get(SyslogConsts.SYSLOG_FACILITY)[0]].getBytes(),
BY_DATE, byDateColumns, ConsistencyLevel.QUORUM);
this.cClient.insert(
SyslogConsts.SEVERITY[event.get(SyslogConsts.SYSLOG_SEVERITY)[0]].toString().getBytes(),
BY_DATE, byDateColumns, ConsistencyLevel.QUORUM);
super.append(event);
}
/** Converts a Long to a big-endian byte[] */
private byte[] toBytes(Long obj) {
if (obj == null) {
return null;
}
long l = obj;
int size = 8;
byte[] b = new byte[size];
for (int i = 0; i < size; ++i) {
b[i] = (byte) (l >> (size - i - 1 << 3));
}
return b;
}
/**
* Returns a byte[] representing the current date.
* This has the format "YYYY-MM-DD HH:MM:SS".
*/
private String getDate() {
Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT+0"));
int day = cal.get(Calendar.DAY_OF_MONTH);
int month = cal.get(Calendar.MONTH);
int year = cal.get(Calendar.YEAR);
int hour = cal.get(Calendar.HOUR_OF_DAY);
int minute = cal.get(Calendar.MINUTE);
int second = cal.get(Calendar.SECOND);
StringBuffer buff = new StringBuffer();
buff.append(year);
if(month < 10)
buff.append('0');
buff.append(month);
if(day < 10)
buff.append('0');
buff.append(day);
if(hour < 10)
buff.append('0');
buff.append(hour);
if(minute < 10)
buff.append('0');
buff.append(minute);
if(second < 10);
buff.append('0');
buff.append(second);
return buff.toString();
}
@Override
public void close() throws IOException {
this.cClient.close();
}
public static SinkBuilder builder() {
return new SinkBuilder() {
@Override
public EventSink build(Context context, String ... args) {
if (args.length < 1) {
throw new IllegalArgumentException(
"usage: logsandraSyslogSink(\"host:port\"...");
}
return new LogsandraSyslogSink(args);
}
};
}
/**
* This is a special function used by the SourceFactory to pull in this class
* as a plugin sink.
*/
public static List<Pair<String, SinkBuilder>> getSinkBuilders() {
List<Pair<String, SinkBuilder>> builders =
new ArrayList<Pair<String, SinkBuilder>>();
builders.add(new Pair<String, SinkBuilder>("logsandraSyslogSink", builder()));
return builders;
}
}