Example of writing a gzip file in go (golang). This appends data to the same file every time it is run. It is important to Flush() the data before closing the file.

gzipWriter.go

/*
  This is an example of a golang gzip writer program,
  which appends data to a file.
  


*/

package main

import (
  "bufio"
	"compress/gzip"
	"log"
	//	"fmt"
	"os"
)

type F struct {
	f  *os.File
	gf *gzip.Writer
	fw *bufio.Writer
}

func CreateGZ(s string) (f F) {

	fi, err := os.OpenFile(s, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0660)
	if err != nil {
		log.Printf("Error in Create\n")
		panic(err)
	}
	gf := gzip.NewWriter(fi)
	fw := bufio.NewWriter(gf)
	f = F{fi, gf, fw}
	return
}

func WriteGZ(f F, s string) {
	(f.fw).WriteString(s)
}

func CloseGZ(f F) {
	f.fw.Flush()
	// Close the gzip first.
	f.gf.Close()
	f.f.Close()
}

func main() {
	f := CreateGZ("Append.gz")
	WriteGZ(f, "gzipWriter.go created this file.\n")
	CloseGZ(f)

}