Make Healthcheck download and ffmpeg reusable

task/ffmpeg.go

@@ -0,0 +1,105 @@
+package task
+
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"log/slog"
+	"os/exec"
+	"sync"
+
+	"git.lastassault.de/speatzle/morffix/config"
+	"git.lastassault.de/speatzle/morffix/types"
+)
+
+type countReader struct {
+	io.Reader
+	n int
+}
+
+func (w *countReader) Read(p []byte) (int, error) {
+	n, err := w.Reader.Read(p)
+	w.n += n
+	return n, err
+}
+
+// dropCR drops a terminal \r from the data.
+func dropCR(data []byte) []byte {
+	if len(data) > 0 && data[len(data)-1] == '\r' {
+		return data[0 : len(data)-1]
+	}
+	return data
+}
+
+func scanLines(data []byte, atEOF bool) (advance int, token []byte, err error) {
+	if atEOF && len(data) == 0 {
+		return 0, nil, nil
+	}
+	if i := bytes.IndexByte(data, '\n'); i >= 0 {
+		// We have a full newline-terminated line.
+		return i + 1, dropCR(data[0:i]), nil
+	}
+	if i := bytes.IndexByte(data, '\r'); i >= 0 {
+		// We have a return line.
+		return i + 1, dropCR(data[0:i]), nil
+	}
+	// If we're at EOF, we have a final, non-terminated line. Return it.
+	if atEOF {
+		return len(data), dropCR(data), nil
+	}
+	// Request more data.
+	return 0, nil, nil
+}
+
+func runFfmpegCommand(ctx context.Context, l *slog.Logger, conf config.Config, command types.FFmpegCommand) error {
+	l.InfoContext(ctx, "Running ffmpeg", "args", command.GetArgs())
+	cmd := exec.CommandContext(ctx, conf.Worker.FFmpegPath, command.GetArgs()...)
+
+	var wg sync.WaitGroup
+
+	stdout, err := cmd.StdoutPipe()
+	if err != nil {
+		return fmt.Errorf("Error getting StdoutPipe: %w", err)
+	}
+
+	wg.Add(1)
+	outScanner := bufio.NewScanner(stdout)
+	outScanner.Split(scanLines)
+	go func() {
+		for outScanner.Scan() {
+			l.InfoContext(ctx, outScanner.Text())
+		}
+		wg.Done()
+	}()
+
+	stderr, err := cmd.StderrPipe()
+	if err != nil {
+		return fmt.Errorf("Error getting StderrPipe: %w", err)
+	}
+	wg.Add(1)
+	errScanner := bufio.NewScanner(stderr)
+	errScanner.Split(scanLines)
+	go func() {
+		for errScanner.Scan() {
+			l.InfoContext(ctx, errScanner.Text())
+		}
+		wg.Done()
+	}()
+
+	err = cmd.Start()
+	if err != nil {
+		l.ErrorContext(ctx, "Error Starting ffmpeg", "err", err)
+		return fmt.Errorf("Error Starting ffmpeg: %w", err)
+	}
+
+	wg.Wait()
+
+	err = cmd.Wait()
+	if err != nil {
+		l.ErrorContext(ctx, "Error Running ffmpeg", "err", err)
+		return fmt.Errorf("Error Running ffmpeg: %w", err)
+	}
+	return nil
+}