feat(feeds): upload progress bar

Author: darkoatanasovski

go.mod

@@ -44,7 +44,7 @@ require (
 	github.com/stretchr/testify v1.9.0
 	github.com/subosito/gotenv v1.2.0 // indirect
 	golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f // indirect
-	golang.org/x/term v0.0.0-20220411215600-e5f449aeb171 // indirect
+	golang.org/x/term v0.0.0-20220411215600-e5f449aeb171
 	golang.org/x/text v0.3.8 // indirect
 	gopkg.in/ini.v1 v1.66.4 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect

pkg/utils/upload.go

@@ -2,11 +2,19 @@ package utils
 
 import (
 	"context"
+	"fmt"
+	"io"
 	"net/http"
 	"os"
+	"path/filepath"
+	"sync/atomic"
+	"time"
+
+	"golang.org/x/term"
 )
 
 // UploadToS3 uploads a local file to the given S3 presigned URL via HTTP PUT.
+// When stderr is a TTY, a progress bar is rendered so large uploads are not opaque.
 func UploadToS3(ctx context.Context, filename, url string) error {
 	data, err := os.Open(filename)
 	if err != nil {
@@ -19,18 +27,154 @@ func UploadToS3(ctx context.Context, filename, url string) error {
 		return err
 	}
 
-	req, err := http.NewRequestWithContext(ctx, "PUT", url, data)
+	size := stat.Size()
+	body := io.Reader(data)
+	var pr *progressReader
+	if term.IsTerminal(int(os.Stderr.Fd())) {
+		pr = newProgressReader(data, size, filepath.Base(filename), os.Stderr)
+		body = pr
+	}
+
+	req, err := http.NewRequestWithContext(ctx, "PUT", url, body)
 	if err != nil {
 		return err
 	}
 	req.Header.Set("Content-Type", "application/json")
-	req.ContentLength = stat.Size()
+	req.ContentLength = size
 
 	resp, err := http.DefaultClient.Do(req)
 	if err != nil {
+		if pr != nil {
+			pr.abort()
+		}
 		return err
 	}
 	defer resp.Body.Close()
 
+	if pr != nil {
+		pr.finish()
+	}
 	return nil
 }
+
+// progressReader wraps an io.Reader and renders a single-line progress bar
+// (carriage-return overwritten) to the given writer. Updates are throttled.
+type progressReader struct {
+	r         io.Reader
+	total     int64
+	read      int64
+	name      string
+	out       io.Writer
+	start     time.Time
+	lastPrint time.Time
+	barWidth  int
+	done      int32
+}
+
+func newProgressReader(r io.Reader, total int64, name string, out io.Writer) *progressReader {
+	return &progressReader{
+		r:        r,
+		total:    total,
+		name:     name,
+		out:      out,
+		start:    time.Now(),
+		barWidth: 30,
+	}
+}
+
+func (p *progressReader) Read(b []byte) (int, error) {
+	n, err := p.r.Read(b)
+	if n > 0 {
+		atomic.AddInt64(&p.read, int64(n))
+		p.maybeRender(false)
+	}
+	return n, err
+}
+
+func (p *progressReader) maybeRender(force bool) {
+	now := time.Now()
+	if !force && now.Sub(p.lastPrint) < 100*time.Millisecond {
+		return
+	}
+	p.lastPrint = now
+	p.render()
+}
+
+func (p *progressReader) render() {
+	read := atomic.LoadInt64(&p.read)
+	elapsed := time.Since(p.start).Seconds()
+	var rate float64
+	if elapsed > 0 {
+		rate = float64(read) / elapsed
+	}
+
+	var pct float64
+	var bar string
+	var eta string
+	if p.total > 0 {
+		pct = float64(read) / float64(p.total) * 100
+		filled := min(int(float64(p.barWidth)*float64(read)/float64(p.total)), p.barWidth)
+		b := make([]byte, p.barWidth)
+		for i := 0; i < p.barWidth; i++ {
+			if i < filled {
+				b[i] = '='
+			} else {
+				b[i] = ' '
+			}
+		}
+		bar = string(b)
+		if rate > 0 && read < p.total {
+			remaining := time.Duration(float64(p.total-read)/rate) * time.Second
+			eta = " ETA " + formatDuration(remaining)
+		}
+		fmt.Fprintf(p.out, "\rUploading %s [%s] %5.1f%% %s/%s %s/s%s",
+			p.name, bar, pct, humanBytes(read), humanBytes(p.total), humanBytes(int64(rate)), eta)
+	} else {
+		fmt.Fprintf(p.out, "\rUploading %s %s %s/s", p.name, humanBytes(read), humanBytes(int64(rate)))
+	}
+}
+
+func (p *progressReader) finish() {
+	if !atomic.CompareAndSwapInt32(&p.done, 0, 1) {
+		return
+	}
+	p.render()
+	fmt.Fprintln(p.out)
+}
+
+func (p *progressReader) abort() {
+	if !atomic.CompareAndSwapInt32(&p.done, 0, 1) {
+		return
+	}
+	fmt.Fprintln(p.out)
+}
+
+func humanBytes(n int64) string {
+	const unit = 1024
+	if n < unit {
+		return fmt.Sprintf("%d B", n)
+	}
+	div, exp := int64(unit), 0
+	for n/div >= unit {
+		div *= unit
+		exp++
+	}
+	return fmt.Sprintf("%.1f %cB", float64(n)/float64(div), "KMGTPE"[exp])
+}
+
+func formatDuration(d time.Duration) string {
+	if d < time.Second {
+		return "<1s"
+	}
+	d = d.Round(time.Second)
+	h := int(d / time.Hour)
+	m := int((d % time.Hour) / time.Minute)
+	s := int((d % time.Minute) / time.Second)
+	if h > 0 {
+		return fmt.Sprintf("%dh%02dm%02ds", h, m, s)
+	}
+	if m > 0 {
+		return fmt.Sprintf("%dm%02ds", m, s)
+	}
+	return fmt.Sprintf("%ds", s)
+}