Logging framework for Go

This is a logging framework mainly for our Go products.

Be warned that this is a framework rather than a library. Most features cannot be configured.

Features

Light-weight.

Hard-coded maximum log buffer size and 1-pass formatters help cybozu-go/log be memory- and CPU- efficient.

Benchmark results show that it can format about 340K logs per second in JSON.
Built-in logfmt and JSON Lines formatters.

By default, logs are formatted in syslog-like plain text. logfmt and JSON Lines formatters can be used alternatively.
Automatic redirect for Go standard logs.

The framework automatically redirects Go standard logs to itself.
Reopen handler.

The framework comes with a handy writer that reopens the log file upon signal reception. Useful for work with log rotating programs.

Only for non-Windows systems.

Go 1.13 or greater is required.