Getting formatted logs in file and on cmd

[gasparyanyur]

Getting formatted logs in file and on cmd

[jl1]

The example shows how to do leveling and formatting, but not both together. To modify the example:

1. Instantiate a backend1Formatter, the same as for backend2Formatter.
2. When "leveling" backend1, give the new backend1formatter as an argument to AddModuleLevel().

The new example would like this:

var format = logging.MustStringFormatter(
	`%{color}%{time:15:04:05.000} %{shortfunc} ▶ %{level:.4s} %{id:03x}%{color:reset} %{message}`,
)

backend1 := logging.NewLogBackend(file, "", 0)
backend2 := logging.NewLogBackend(os.Stderr, "", 0)

// For messages written to backend2 we want to add some additional
// information to the output, including the used log level and the name of
// the function.
backend2Formatter := logging.NewBackendFormatter(backend2, format)

// Colors for backend1
backend1Formatter := logging.NewBackendFormatter(backend1, format)

// Only errors and more severe messages should be sent to backend1
backend1Leveled := logging.AddModuleLevel(backend1Formatter)
backend1Leveled.SetLevel(logging.ERROR, "")

// Set the backends to be used.
logging.SetBackend(backend1Leveled, backend2Formatter)