如何停用 Go 應用程式中的日誌記錄？

Disabling the Default Logger in Go

Many Go applications make use of the log package for logging. By default, the standard logger writes to standard output and can be verbose at times. When it's necessary to disable logging, there are a few approaches to consider.

One option is to manually check a flag before making log calls or comment them out in production. However, a more elegant and efficient way to disable logging is to redirect the logger's output.

Using io/ioutil.Discard

Prior to Go 1.16, one method of disabling logging involved creating a custom io.Writer type that discarded the output. This can be achieved by defining a struct that implements the Write method and makes it discard the data:

type discardWriter struct{}

func (w discardWriter) Write(p []byte) (n int, err error) {
    return len(p), nil
}

You can then use this custom writer to redirect the logger's output:

import (
    "log"
    "io/ioutil"
)

func init() {
    log.SetOutput(ioutil.Discard)
}

With this setup, the logger will appear to be writing to standard output, but the output will be silently discarded.

Using io.Discard (Go 1.16+)

In Go 1.16 and later, a simpler approach is available. The io/ioutil package provides a Discard writer that discards all data written to it. You can use it directly as follows:

log.SetOutput(io.Discard)

This will completely disable logging for the standard logger.

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