mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
102 lines
2.3 KiB
Go
102 lines
2.3 KiB
Go
package future
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import (
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"bytes"
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"crypto/sha256"
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"fmt"
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"io"
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"math/rand"
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"os/exec"
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"time"
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)
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func Seed() {
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rand.Seed(time.Now().UTC().UnixNano())
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}
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func ComputeId(content io.Reader) (string, error) {
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h := sha256.New()
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if _, err := io.Copy(h, content); err != nil {
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return "", err
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}
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return fmt.Sprintf("%x", h.Sum(nil)[:8]), nil
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}
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func HumanDuration(d time.Duration) string {
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if seconds := int(d.Seconds()); seconds < 1 {
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return "Less than a second"
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} else if seconds < 60 {
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return fmt.Sprintf("%d seconds", seconds)
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} else if minutes := int(d.Minutes()); minutes == 1 {
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return "About a minute"
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} else if minutes < 60 {
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return fmt.Sprintf("%d minutes", minutes)
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} else if hours := int(d.Hours()); hours == 1 {
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return "About an hour"
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} else if hours < 48 {
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return fmt.Sprintf("%d hours", hours)
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} else if hours < 24*7*2 {
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return fmt.Sprintf("%d days", hours/24)
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} else if hours < 24*30*3 {
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return fmt.Sprintf("%d weeks", hours/24/7)
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} else if hours < 24*365*2 {
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return fmt.Sprintf("%d months", hours/24/30)
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}
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return fmt.Sprintf("%d years", d.Hours()/24/365)
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}
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func randomBytes() io.Reader {
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return bytes.NewBuffer([]byte(fmt.Sprintf("%x", rand.Int())))
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}
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func RandomId() string {
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id, _ := ComputeId(randomBytes()) // can't fail
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return id
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}
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func Go(f func() error) chan error {
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ch := make(chan error)
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go func() {
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ch <- f()
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}()
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return ch
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}
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// Pv wraps an io.Reader such that it is passed through unchanged,
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// but logs the number of bytes copied (comparable to the unix command pv)
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func Pv(src io.Reader, info io.Writer) io.Reader {
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var totalBytes int
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data := make([]byte, 2048)
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r, w := io.Pipe()
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go func() {
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for {
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if n, err := src.Read(data); err != nil {
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w.CloseWithError(err)
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return
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} else {
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totalBytes += n
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fmt.Fprintf(info, "--> %d bytes\n", totalBytes)
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if _, err = w.Write(data[:n]); err != nil {
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return
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}
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}
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}
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}()
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return r
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}
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// Curl makes an http request by executing the unix command 'curl', and returns
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// the body of the response. If `stderr` is not nil, a progress bar will be
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// written to it.
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func Curl(url string, stderr io.Writer) (io.Reader, error) {
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curl := exec.Command("curl", "-#", "-L", url)
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output, err := curl.StdoutPipe()
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if err != nil {
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return nil, err
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}
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curl.Stderr = stderr
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if err := curl.Start(); err != nil {
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return nil, err
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}
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return output, nil
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}
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