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main.go
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main.go
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package main
import (
"fmt"
"os"
"time"
"github.com/cavaliercoder/grab"
)
func main() {
// create client
client := grab.NewClient()
req, _ := grab.NewRequest(".", "http://www.golang-book.com/public/pdf/gobook.pdf")
// start download
fmt.Printf("Downloading %v...\n", req.URL())
resp := client.Do(req)
fmt.Printf(" %v\n", resp.HTTPResponse.Status)
// start UI loop
t := time.NewTicker(500 * time.Millisecond)
defer t.Stop()
Loop:
for {
select {
case <-t.C:
fmt.Printf(" transferred %v / %v bytes (%.2f%%)\n",
resp.BytesComplete(),
resp.Size(),
100*resp.Progress())
case <-resp.Done:
// download is complete
break Loop
}
}
// check for errors
if err := resp.Err(); err != nil {
fmt.Fprintf(os.Stderr, "Download failed: %v\n", err)
os.Exit(1)
}
fmt.Printf("Download saved to ./%v \n", resp.Filename)
// Output:
// Downloading http://www.golang-book.com/public/pdf/gobook.pdf...
// 200 OK
// transferred 42970 / 2893557 bytes (1.49%)
// transferred 1207474 / 2893557 bytes (41.73%)
// transferred 2758210 / 2893557 bytes (95.32%)
// Download saved to ./gobook.pdf
}