golang reads the contents of the log file in the directory

Question content

I am trying to read all log files within a directory, the code below is able to read the file names but not its contents .

Console output

ds-api-doc-.log false
2023/03/21 11:27:11 open /Users/xxx/ds-api-doc.log: no such file or directory 







 files, err := ioutil.ReadDir("./logs/")
            if err != nil {
                log.Fatal(err)
            }
            fmt.Println(totalTicks)
            for _, file := range files {
                fmt.Println(file.Name(), file.IsDir())
                abs, err := filepath.Abs(file.Name())
        
                file, err := os.Open(abs)
                if err != nil {
                    log.Fatal(err)
                }
                defer file.Close()
        
                scanner := bufio.NewScanner(file)
                for scanner.Scan() {
                    fmt.Println(scanner.Text())
                }
        
                if err := scanner.Err(); err != nil {
                    log.Fatal(err)
                }
        
            }

Correct answer

file.name() Returns only the base name of the file.

filepath.abs​​() will add the given path, in this case the base name of the file, to the current working directory. Therefore, the returned abs value will be missing the ./logs/ segment of the file path.

To resolve this issue, you can do the following:

abs, err := filepath.abs(filepath.join("logs", file.name()))

Alternatively, you can use filepath.walkdir, which provides the file path for the fn parameter.

err := filepath.WalkDir("./logs/", func(path string, de fs.DirEntry, err error) error) {
    if err != nil {
        return err
    } else if de.IsDir() {
        return nil
    }

    file, err := os.Open(path)
    // ...
    return nil
}) 

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