Log Analyser

A production-grade log analysis tool built in Python. Parses, normalises, and extracts insights from multiple log formats — JSON, Apache Combined Log Format, and Syslog — using a unified, extensible parser architecture.

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Features

• Multi-format parsing — JSON, Apache, and Syslog parsers with a shared interface
• Memory-efficient streaming — processes files of any size line by line, constant memory usage
• Level normalisation — maps format-specific level names to a standard set (INFO, WARN, ERROR, CRITICAL)
• Graceful error handling — malformed lines are skipped and counted, never crash the program
• Extensible architecture — add new formats by implementing one method (parse_line)
• Fully tested — 80+ tests across all parsers using pytest

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Project Structure

log_analyser/
├── parsers/
│   ├── base.py            # Abstract base class — shared interface for all parsers
│   ├── json_parser.py     # JSON log parser (supports multiple field aliases)
│   ├── apache_parser.py   # Apache Combined Log Format parser
│   └── syslog_parser.py   # Syslog format parser with keyword-based level detection
├── tests/
│   ├── test_json_parser.py
│   ├── test_apache_parser.py
│   └──