Log Analyzer

Rust Bytes Issue 93 Challenge template

Task

You are given a system log file named Mac_2k.log, located in the src directory.

The file contains real macOS-style log entries that follow this general pattern:

<Month> <Day> <Time> <Hostname> <Process>[PID]: <Message>

Write a Rust program that reads and parses the file Mac_2k.log. Each line should be parsed into:

• timestamp - e.g., Jul 1 09:00:55

• hostname - e.g., calvisitor-10-105-160-95

• process name - e.g., kernel, com.apple.cts, configd, etc.

• process ID (PID) - e.g., [0], [43]

• log message - everything after the colon

What You Need to Produce

• Per-process stats: Count how many log entries each process generated (process name only, ignore PID).

• Per-hostname stats: Count how many entries came from each hostname.

• Global stats:

  • Most frequent process

  • Most frequent hostname

  • Optional: Most common keywords in log messages (lowercased, tokenized, stopwords removed)

Write all results to a summary.json file using the structure below:

You can start by cloning the example repo on GitHub for reference.

Credits: Thanks to Loghub for providing the log file used in this challenge.