Bunyan Viewer

This project is a rewrite of the node-bunyan bunyan format log viewer CLI tool fully reimplemented in Rust.

Bunyan Viewer aims to be a stand-alone replacement for the node bunyan tool such that it:

• Does not require additional runtimes (such as nodejs)
• Can handle large log files with ease
• Processes each log line in a memory efficient manner

Divergences

We aim to provide output that is as close as possible to the node-bunyan viewer with a few intentional divergences.

Features

Bunyan Viewer supports the following features:

• The same output modes as the node-bunyan viewer (-o, --output flag):
  • bunyan: 0 indented JSON, bunyan's native format
  • inspect: node.js util.inspect output
  • json: JSON output, 2-space indent
  • json-N: JSON output, N-space indent, e.g. "json-4"
  • long: (the default) pretty
  • short: like "long", but more concise
  • simple: level, followed by "-" and then the message`
• Support for conditional matching (--condition flag)
• Local time conversion (-L, --time-local flag)
• Filtering by level (-l, --level flag)
• Strict mode (--strict flag)
• Optional colorization - with a few extra colors sprinkled in (--color flag)
• Pager support (--pager flag)
• Decompression of gzipped archives
• Node bunyan CLI compatibility
• Supports viewing large log files

Limitations

Bunyan Viewer does not yet support the following:

• Runtime log snooping via DTrace (-p flag)

Installation

Install the Bunyan Viewer into your Cargo Crates enabled environment by installing the crate:

  cargo install bunyan_view

Usage

Directly viewing one or more bunyan log files:

  bunyan logs/logs-001.log logs/logs-002.log logs/big-log-003.log.gz

View logs via piped input:

  cat logs/logs-001.log | bunyan 

Alternatively:

  bunyan < logs/logs-001.log

For additional usage help:

  bunyan --help

Testing

When running the automated testing suite, be sure to enable the dumb_terminal feature so that colorization is disabled. You can do this by invoking cargo test as follows:

  cargo test --features dumb_terminal

Other Bunyan Projects

• node-bunyan - The original that inspired this project
• bunyan-rs - Another rust port of bunyan
• log4j2-bunyan-layout - Bunyan Layout for Log4j2

License

This project is licensed under the Mozilla Public License Version 2.0. See the LICENSE.txt file for more details.