mirror of
https://github.com/edgelesssys/constellation.git
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9441e46e4b
Remove "failed" from wrapped errors Where appropriate rephrase "unable to/could not" to "failed" in root errors Start error log messages with "Failed"
139 lines
3.4 KiB
Go
139 lines
3.4 KiB
Go
package coordinator
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import (
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"errors"
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"fmt"
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"io"
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"os"
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"sync"
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pb "github.com/edgelesssys/constellation/debugd/service"
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"github.com/schollz/progressbar/v3"
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"github.com/spf13/afero"
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)
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// FileStreamer handles reading and writing of a file using a stream of chunks.
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type FileStreamer struct {
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fs afero.Fs
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mux sync.RWMutex
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}
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// ReadChunkStream is abstraction over a gRPC stream that allows us to receive chunks via gRPC.
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type ReadChunkStream interface {
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Recv() (*pb.Chunk, error)
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}
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// WriteChunkStream is abstraction over a gRPC stream that allows us to send chunks via gRPC.
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type WriteChunkStream interface {
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Send(chunk *pb.Chunk) error
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}
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// NewFileStreamer creates a new FileStreamer.
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func NewFileStreamer(fs afero.Fs) *FileStreamer {
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return &FileStreamer{
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fs: fs,
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mux: sync.RWMutex{},
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}
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}
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// WriteStream opens a file to write to and streams chunks from a gRPC stream into the file.
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func (f *FileStreamer) WriteStream(filename string, stream ReadChunkStream, showProgress bool) error {
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// try to read from stream once before acquiring write lock
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chunk, err := stream.Recv()
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if err != nil {
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return fmt.Errorf("reading stream: %w", err)
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}
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f.mux.Lock()
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defer f.mux.Unlock()
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file, err := f.fs.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0o755)
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if err != nil {
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return fmt.Errorf("open %v for writing: %w", filename, err)
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}
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defer file.Close()
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var bar *progressbar.ProgressBar
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if showProgress {
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bar = progressbar.NewOptions64(
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-1,
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progressbar.OptionSetDescription("receiving coordinator"),
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progressbar.OptionShowBytes(true),
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progressbar.OptionClearOnFinish(),
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)
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defer bar.Close()
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}
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for {
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if err != nil {
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if errors.Is(err, io.EOF) {
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break
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}
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_ = file.Close()
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_ = f.fs.Remove(filename)
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return fmt.Errorf("reading stream: %w", err)
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}
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if _, err := file.Write(chunk.Content); err != nil {
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_ = file.Close()
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_ = f.fs.Remove(filename)
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return fmt.Errorf("writing chunk to disk: %w", err)
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}
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if showProgress {
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_ = bar.Add(len(chunk.Content))
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}
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chunk, err = stream.Recv()
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}
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return nil
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}
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// ReadStream opens a file to read from and streams its contents chunkwise over gRPC.
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func (f *FileStreamer) ReadStream(filename string, stream WriteChunkStream, chunksize uint, showProgress bool) error {
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if chunksize == 0 {
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return errors.New("invalid chunksize")
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}
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// fail if file is currently RW locked
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if f.mux.TryRLock() {
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defer f.mux.RUnlock()
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} else {
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return errors.New("file is opened for writing cannot be read at this time")
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}
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file, err := f.fs.OpenFile(filename, os.O_RDONLY, 0o755)
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if err != nil {
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return fmt.Errorf("open %v for reading: %w", filename, err)
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}
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defer file.Close()
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var bar *progressbar.ProgressBar
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if showProgress {
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stat, err := file.Stat()
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if err != nil {
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return fmt.Errorf("performing stat on %v to get the file size: %w", filename, err)
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}
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bar = progressbar.NewOptions64(
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stat.Size(),
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progressbar.OptionSetDescription("uploading coordinator"),
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progressbar.OptionShowBytes(true),
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progressbar.OptionClearOnFinish(),
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)
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defer bar.Close()
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}
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buf := make([]byte, chunksize)
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for {
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n, err := file.Read(buf)
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if err != nil {
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if errors.Is(err, io.EOF) {
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return nil
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}
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return fmt.Errorf("reading file chunk: %w", err)
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}
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if err = stream.Send(&pb.Chunk{Content: buf[:n]}); err != nil {
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return fmt.Errorf("sending chunk: %w", err)
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}
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if showProgress {
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_ = bar.Add(n)
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}
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}
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}
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