如何在日志中隐藏日志级别和时间

Question

I am trying to write the logs in CSV format. I am trying to use logrus to write the CSV as logs. But I see the log level (info) and the time getting added to the CSV content in logs. Like,

time="2015-11-18T01:27:38-04:00" level=info msg="100,Click,Android"

How can I write only my message using logrus? Or should I use any other loggers available in golang?

Note: I am a newbie to go

Answer 1

I am trying to use logrus to write the CSV as logs. But I see the log level (info) and the time getting added to the CSV content in logs.

It looks like you definitely shouldn't be using logrus, as the main reason it exists is creating structured logs, i.e. key-value style. Not sure why don't you simply do

fmt.Println("100,Click,Android")

or

fmt.Fprintln(os.Stderr, "100,Click,Android")

if you want it to be written into the standard error (default for loggers).

If for any reason you need a logger, you can pretty much do the same thing with the standard logger by disabling flags:

log.SetFlags(0)
log.Println("100,Click,Android")

// Output:
// 100,Click,Android

However, if you're creating a CSV output yourself (i.e. you have spearate fields rather than full CSV lines already), use csv package from the standard library:

w := csv.NewWriter(os.Stdout)
w.Write([]string{"100", "Click", "Android"})
w.Flush()

// Output:
// 100,Click,Android

Unless you just want to use logrus, then follow the concept of the package and stick with structured output:

logrus.WithFields(logrus.Fields{
    "id": "100",
    "event": "Click",
    "os": "Android",
}).Info("Hooray, we have some users!")

// Output:
// time="2015-11-19T15:20:32+01:00" level=info msg="Hooray, we have some users!" event=Click id=100 os=Android