How Can I Gracefully Handle Non-Existent Files in Go?

Dealing with Non-Existent Text Files

In many file handling scenarios, it's essential to check for the existence of a file before performing operations on it. However, when faced with a non-existent file, you may encounter panics or errors in your code.

To address this issue, you can implement a function that gracefully handles the absence of a file by creating an empty file before any read operations. Here's how you can accomplish this:

import (
    "os"
)

func ensureFileExists(path string) error {
    _, err := os.Stat(path)
    if err != nil && os.IsNotExist(err) {
        _, err = os.OpenFile(path, os.O_RDONLY|os.O_CREATE, 0666)
        if err != nil {
            return err
        }
    }
    return nil
}

This function uses the os.Stat() function to check if the file exists. If the file is not found (indicated by the os.IsNotExist() error), it opens the file using the os.OpenFile() function with the O_RDONLY and O_CREATE flags. This creates an empty file if it doesn't already exist, allowing subsequent read operations to function correctly without panic.

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