Common logging infrastructure

This log package is taken from Istio and provides the canonical logging functionality used by Go-based components.

Istio's logging subsystem is built on top of the Zap package. High performance scenarios should use the Error, Warn, Info, and Debug methods. Lower perf scenarios can use the more expensive convenience methods such as Debugf and Warnw.

The package provides direct integration with the Cobra command-line processor which makes it easy to build programs that use a consistent interface for logging. Here's an example of a simple Cobra-based program using this log package:

func main() {
    // get the default logging options
    options := log.DefaultOptions()

    rootCmd := &cobra.Command{
        Run: func(cmd *cobra.Command, args []string) {

            // configure the logging system
            if err := log.Configure(options); err != nil {
                // print an error and quit
            }

            // output some logs
            log.Info("Hello")
            log.Sync()
        },
    }

    // add logging-specific flags to the cobra command
    options.AttachFlags(rootCmd)
    rootCmd.SetArgs(os.Args[1:])
    rootCmd.Execute()
}

Once configured, this package intercepts the output of the standard golang "log" package as well as anything sent to the global zap logger (zap.L()).

Installing

The log package can be installed using go get:

go get -u github.com/tetratelabs/log

To build it from source just run:

make

License

This sowftare is licensed under the Apache License 2.0. See LICENSE file for details.