golang turns off log printing

In golang, using log printing is a very common way. However, in some scenarios that require performance and efficiency, turning off log printing can improve the running speed of the program and reduce the interference of irrelevant logs. This article will introduce how to turn off log printing and improve program performance.

Generally, using logs in golang can be divided into two ways:

The first is to use the log package in the standard library to print logs:

import "log"

func main() {
    log.Println("Hello, World!")
}

The second is to use a third-party library, such as logrus. Here we take logrus as an example:

import "github.com/sirupsen/logrus"

func main() {
    logrus.SetLevel(logrus.WarnLevel)
    logrus.SetFormatter(&logrus.JSONFormatter{})
    logrus.Warn("Something not good happened")
}

In the above code, we use the SetLevel and SetFormatter functions of logrus to set the log level and format printed by logrus. .

But in some systems with high performance and efficiency requirements, log printing will become a performance bottleneck. In these cases, we need to turn off the log printing function.

Close the log in the standard library

When we want to turn off the log printing function in the standard library, we can set the printing pipe to Discard by calling the log.SetOutput(ioutil.Discard) function. Turn off log printing.

import (
    "io/ioutil"
    "log"
)

func main() {
    log.SetOutput(ioutil.Discard)
    log.Println("This won't get printed")
}

In the above code, we use the ioutil.Discard function to set the printing pipe to Discard, realizing the function of turning off log printing. At this point, the log.Println function will no longer output anything.

Close logrus

For the third-party library logrus, log printing also needs to be turned off in systems with high performance and efficiency requirements. This can be achieved in the following two ways:

1. Set the log level to PanicLevel

Set the log level to PanicLevel, which will cause logrus to only record logs below the panic level . The code is as follows:

import "github.com/sirupsen/logrus"

func main() {
    logrus.SetLevel(logrus.PanicLevel)
    logrus.Warn("This won't get printed")
}

In the above code, we use the SetLevel function of logrus to set the log level to PanicLevel, realizing the function of turning off logrus printing.

2. Close logrus hooks

Logrus provides hooks, and they will be registered in logrus when the application starts. When certain events occur, logrus will send messages to registered hooks. However, in some systems with high performance and efficiency requirements, these hooks will consume more system resources. In these cases, we can turn off hooks through the following code:

import (
    "github.com/sirupsen/logrus"
    "github.com/sirupsen/logrus/hooks"
)

func main() {
    logrus.AddHook(&hooks.NullHook{})
    logrus.Warn("This won't get printed")
}

In the above code, we call the AddHook function and add NullHook to the logrus hooks, realizing the function of turning off logrus printing.

To sum up, for some systems that have high requirements on performance and efficiency, using the above solution to turn off the log printing function when necessary can improve system performance and reduce system interference.

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