Github user nickwallen commented on a diff in the pull request:
https://github.com/apache/incubator-metron/pull/276#discussion_r83000386
--- Diff:
metron-platform/metron-parsers/src/main/java/org/apache/metron/parsers/utils/SyslogUtils.java
---
@@ -0,0 +1,125 @@
+/**
+ * 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.metron.parsers.utils;
+
+import org.apache.metron.parsers.ParseException;
+
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
+import java.time.temporal.TemporalAccessor;
+import java.util.regex.Pattern;
+
+import static java.time.temporal.ChronoField.*;
+
+public class SyslogUtils {
+
+ public static long parseTimestampToEpochMillis(String logTimestamp,
ZoneId timeZone) throws ParseException {
+ // RFC3164 (standard syslog timestamp; no year)
+ // MMM ppd HH:mm:ss
+ // Oct 9 2015 13:42:11
+ if
(Pattern.matches("[A-Z][a-z]{2}(?:(?:\\s{2}\\d)|(?:\\s\\d{2}))\\s\\d{2}:\\d{2}:\\d{2}",
logTimestamp)) {
+ DateTimeFormatter inputFormat =
DateTimeFormatter.ofPattern("MMM ppd HH:mm:ss").withZone(timeZone);
+
+ TemporalAccessor inputDate = inputFormat.parse(logTimestamp);
+ int inputMonth = inputDate.get(MONTH_OF_YEAR);
+ int inputDay = inputDate.get(DAY_OF_MONTH);
+ int inputHour = inputDate.get(HOUR_OF_DAY);
+ int inputMinute = inputDate.get(MINUTE_OF_HOUR);
+ int inputSecond = inputDate.get(SECOND_OF_MINUTE);
+
+ ZonedDateTime currentDate = ZonedDateTime.now(timeZone);
+ int normalizedYear = currentDate.getYear();
+
+ /**
+ * Since no year is provided, one must be derived.
+ * During the month of January (first 31 days of the year),
assume logs coming in from
+ * November (11) and December (12) are from the previous
year.
+ */
+ if (currentDate.getDayOfYear() <= 31 && inputMonth >= 11)
+ normalizedYear--;
+ ZonedDateTime normalizedTimestamp =
ZonedDateTime.of(normalizedYear, inputMonth, inputDay, inputHour, inputMinute,
inputSecond, 0, timeZone);
+ return normalizedTimestamp.toInstant().toEpochMilli();
+ }
+
+ // CISCO timestamp (standard syslog + year)
+ // MMM dd yyyy HH:mm:ss
+ // Oct 09 2015 13:42:11
+ else if
(Pattern.matches("[A-Z][a-z]{2}\\s\\d{2}\\s\\d{4}\\s\\d{2}:\\d{2}:\\d{2}",
logTimestamp))
+ return convertToEpochMillis(logTimestamp,
DateTimeFormatter.ofPattern("MMM dd yyyy HH:mm:ss").withZone(timeZone));
+
+ // RFC5424 (ISO timestamp)
+ // 2015-10-09T13:42:11.52Z or 2015-10-09T13:42:11.52-04:00
+ else if
(Pattern.matches("\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}(?:\\.\\d+)?(?:Z|[+-]\\d{2}:\\d{2})",
logTimestamp))
+ return convertToEpochMillis(logTimestamp,
DateTimeFormatter.ISO_OFFSET_DATE_TIME);
+
+ else
+ throw new ParseException(String.format("Unsupported date
format: '%s'", logTimestamp));
--- End diff --
Just curious, any reason we're using a checked exception here? In other
places we're just using run time exceptions. The ParseException that you
created is used only for this, I believe.
Not a big deal either way.
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