A minimalistic tool written in Haskell allows for searching log entries in arbitrarily large and noisy log files by specifying a searchable log datetime and precision. It can be used either as a standalone CLI tool, as a helper library to build sophisticated log analysis tools, or simply as the first step in a larger UNIX pipeline.
Search for a log entry using a given timestamp with millisecond precision:
hlogsearch -p /var/log/cassandra/gc.log -d 2019-12-12T10:34:28.909343455Z --precision 0.001 Note: precision of 1 means 1 second.
cabal run is all you need.
Refer to Main.hs for an example on how to use hlogsearch as a library.
hlogsearch expects unstructured log file formats with dates printed in ISO 8601 format.