Github user nickwallen commented on a diff in the pull request: https://github.com/apache/incubator-metron/pull/276#discussion_r82502874 --- Diff: metron-platform/metron-parsers/src/main/java/org/apache/metron/parsers/utils/SyslogUtils.java --- @@ -0,0 +1,89 @@ +/** + * 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 java.time.ZoneOffset; +import java.time.ZonedDateTime; +import java.time.format.DateTimeFormatter; + +public class SyslogUtils { + + public static long convertToEpochMillis(String logTimestamp, String logTimeFormat) { + ZonedDateTime timestamp = ZonedDateTime.parse(logTimestamp, DateTimeFormatter.ofPattern(logTimeFormat).withZone(ZoneOffset.UTC)); + return timestamp.toEpochSecond() * 1000; + } + + public static long parseTimestampToEpochMillis(String logTimestamp) { + if (logTimestamp.length() < 20) { + ZonedDateTime now = ZonedDateTime.now(ZoneOffset.UTC); + int year = now.getYear(); + if (now.getDayOfYear() == 1 && !now.getMonth().toString().substring(0,3).equals(logTimestamp.substring(0,3).toUpperCase())) + year--; --- End diff -- Gotcha. So anything that comes in on the first day of the year, with a month that is not January, will be backdated. If something comes in on the 2nd day of the year, with a month of December, it will NOT be backdated. The period of time that we are willing to backdate, is effectively 1 day currently. Maybe that time period needs to be configurable. The user defines the period of time, 1 day, 2 days, 1 week, after the beginning of the year in which messages can possibly be backdated. Are there certain conditions under which the logic should blow-up and error? What if we are going to backdate a message where the month is July? Should we just do that or should we error?
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