Pipe stdin to a redis pub/sub channel.

pub is an executable for piping data from stdin to a specified Redis pub/sub channel.

A typical use for this tool is to tail a log file, match a specific line with grep, and pipe it into Redis where multiple consumers can do something different with each incoming log line:

tail -F /var/log/somelogfile.log | grep "tracker.gps.parsed" | pub loglines

It also comes with a utility named sub for piping from a Redis pub/sub channel to stdout:

sub loglines | grep "somemsg"

Welcome!

The pub utility publishes input from stdin to a redis channel and the sub utility consumes from a redis channel, writing to stdout.

Quickstart

Publishing to Redis from stdin is easy with the pub utility:

$ pub --help
Pipe stdin to a redis pub/sub channel

Usage: pub --channel TEXT [--host STRING] [--port INTEGER] [--db INTEGER]
           [--version]

Available options:
  -h,--help                Show this help text
  --channel TEXT           Redis channel to publish to
  --host STRING            Redis host (default: localhost)
  --port INTEGER           Redis post (default: 6379)
  --db INTEGER             Redis db (default: 0)

$ journalctl -f nginx.service | pub --channel "nginx-loglines"

and subscribing to Redis channels and piping to stdout is also easy with the sub utility:

$ sub --help
Subscribe to redis channels and pipe to stdout

Usage: sub [--channel TEXT]... [--host STRING] [--port INTEGER] [--db INTEGER]
           [--version]

Available options:
  -h,--help                Show this help text
  --channel TEXT...        Redis channel(s) to subscribe to
  --host STRING            Redis host (default: localhost)
  --port INTEGER           Redis post (default: 6379)
  --db INTEGER             Redis db (default: 0)

$ sub --channel "nginx-loglines" --channel "haproxy-loglines" # This subscribes to both redis channels

Building

You can build multiple ways:

• stack build
• cabal build
• nix-build --not-out-link -A pub release.nix
• nix-shell -A pub.env release.nix.