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golangでtar.gzファイルを読む

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業務で複数のcsvファイルがtar.gzで圧縮されており、その一つのファイルを読みだす必要があった。

Golangの場合、標準パッケージのarchive/tarcompress/gzipを使って、ひたすらReaderを重ねていくだけで、実現できた。

package main

import (
    "archive/tar"
    "compress/gzip"
    "encoding/csv"
    "fmt"
    "io"
    "os"
)

func main() {

    file, _ := os.Open("target.tar.gz")
    defer file.Close()

    // gzipの展開
    gzipReader, _ := gzip.NewReader(file)
    defer gzipReader.Close()

    // tarの展開
    tarReader := tar.NewReader(gzipReader)

    for {
        tarHeader, err := tarReader.Next()
        if err == io.EOF {
            break
        }

        // ファイルの特定
        if tarHeader.Name == "target.csv" {

            // あとはCSVの処理
            csvReader := csv.NewReader(tarReader)
            for {
                row, err := csvReader.Read()
                if err == io.EOF {
                    break
                }
                fmt.Println("csv:", row)
            }
        }
    }
}

74th
k8sとPythonとVSCodeでごはん食べてる。 github: @74th twitter: @74th
https://github.com/74th
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