How to solve the problem of concurrent log synchronization in Go language?

How to solve the problem of concurrent log synchronization in Go language?

With the rapid development of modern software development, the requirements for the concurrent performance of the system are getting higher and higher. In high-concurrency scenarios, log recording is an essential operation. However, when multiple goroutines write to the log file at the same time, a race condition may occur, causing the log contents to overwrite each other. To solve this problem, we need to use concurrent and safe logging methods.

In Go language, we can use sync.Mutexmutex lock to ensure that only one goroutine can write to the log, and other goroutines need to wait. The following is a sample code that shows how to use a mutex lock to solve the problem of concurrent log synchronization:

package main

import (
    "fmt"
    "log"
    "os"
    "sync"
)

type Logger struct {
    file *os.File
    mu   sync.Mutex
}

func NewLogger(filename string) (*Logger, error) {
    file, err := os.OpenFile(filename, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
    if err != nil {
        return nil, err
    }
    return &Logger{file: file}, nil
}

func (l *Logger) WriteLog(msg string) {
    l.mu.Lock()
    defer l.mu.Unlock()
    log.SetOutput(l.file)
    log.Println(msg)
}

func main() {
    logger, err := NewLogger("log.txt")
    if err != nil {
        fmt.Println("Failed to create logger:", err)
        return
    }

    var wg sync.WaitGroup
    for i := 0; i < 10; i++ {
        wg.Add(1)
        go func(index int) {
            defer wg.Done()
            logger.WriteLog(fmt.Sprintf("Log message from goroutine %d", index))
        }(i)
    }
    wg.Wait()
}

In the above example, we define a Logger structure, which contains A mutex lock mu and a file handle file. NewLoggerThe function is used to create a new Logger instance and open the specified log file. The WriteLog method is used to write log messages. It first obtains a mutex lock to ensure that only one goroutine can write to the log, and then uses the standard library log package to actually write the log file. Finally, we created 10 goroutines in the main function, and each goroutine wrote a log message.

By using a mutex lock, we can ensure that only one goroutine is writing to the log file at a time, and other goroutines need to wait. This avoids race conditions during concurrent writes, thereby solving the problem of concurrent log synchronization.

To sum up, mutex locks can be used in Go language to solve the problem of concurrent log synchronization. By acquiring the mutex lock before writing to the log, you can ensure that only one goroutine writes to the log file at the same time, thus avoiding race conditions. This approach can effectively improve the concurrency performance and security of the system.

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