How to create a compressed gzip file from data in Go?

To create a compressed gzip file from data in Go, you can use the compress/gzip package.

Here is an example:

package main

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

func main() {
	// Open the output gzip file
	outputFile, err := os.Create("output.gz")
	if err != nil {
		log.Fatal(err)
	}
	defer outputFile.Close()

	// Create a gzip writer
	gzipWriter := gzip.NewWriter(outputFile)
	defer gzipWriter.Close()

	// Write data to the gzip writer
	data := []byte("This is the content of the gzip file.")
	_, err = gzipWriter.Write(data)
	if err != nil {
		log.Fatal(err)
	}

	// Flush the gzip writer to ensure all data is written
	err = gzipWriter.Flush()
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println("Gzip file created successfully.")
}

In the above example, we create a new gzip file named "output.gz" using os.Create. Then we create a gzip.Writer to write compressed data to the file. After writing the data, we need to flush the writer using Flush to ensure all data is written to the file.

Note that we defer closing both the gzip writer and the output file. Defer ensures that the resources are properly closed when the program finishes executing.

By running the above code, you will create a compressed gzip file named "output.gz" containing the provided data.