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feat(shwap):Add eds streaming (celestiaorg#3531)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| package eds | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
|
|
||
| "github.com/celestiaorg/celestia-node/share" | ||
| ) | ||
|
|
||
| // BufferedReader will read Shares from getShare function into the buffer. | ||
| // It exposes the buffer to be read by io.Reader interface implementation | ||
| type BufferedReader struct { | ||
| buf *bytes.Buffer | ||
| getShare func(rowIdx, colIdx int) ([]byte, error) | ||
| // current is the amount of Shares stored in square that have been written by squareCopy. When | ||
| // current reaches total, squareCopy will prevent further reads by returning io.EOF | ||
| current, odsSize, total int | ||
| } | ||
|
|
||
| func NewSharesReader(odsSize int, getShare func(rowIdx, colIdx int) ([]byte, error)) *BufferedReader { | ||
| return &BufferedReader{ | ||
| getShare: getShare, | ||
| buf: bytes.NewBuffer(nil), | ||
| odsSize: odsSize, | ||
| total: odsSize * odsSize, | ||
| } | ||
| } | ||
|
|
||
| func (r *BufferedReader) Read(p []byte) (int, error) { | ||
| if r.current >= r.total && r.buf.Len() == 0 { | ||
| return 0, io.EOF | ||
| } | ||
| // if provided array is smaller than data in buf, read from buf | ||
| if len(p) <= r.buf.Len() { | ||
| return r.buf.Read(p) | ||
| } | ||
| n, err := io.ReadFull(r.buf, p) | ||
| if err == nil { | ||
| return n, nil | ||
| } | ||
| if !errors.Is(err, io.ErrUnexpectedEOF) && !errors.Is(err, io.EOF) { | ||
| return n, fmt.Errorf("unexpected error reading from buf: %w", err) | ||
| } | ||
|
|
||
| written := n | ||
| for r.current < r.total { | ||
| rowIdx, colIdx := r.current/r.odsSize, r.current%r.odsSize | ||
| share, err := r.getShare(rowIdx, colIdx) | ||
| if err != nil { | ||
| return 0, fmt.Errorf("get share: %w", err) | ||
| } | ||
|
|
||
| // copy share to provided buffer | ||
| emptySpace := len(p) - written | ||
| r.current++ | ||
| if len(share) < emptySpace { | ||
| n := copy(p[written:], share) | ||
| written += n | ||
| continue | ||
| } | ||
|
|
||
| // if share didn't fit into buffer fully, store remaining bytes into inner buf | ||
| n := copy(p[written:], share[:emptySpace]) | ||
| written += n | ||
| n, err = r.buf.Write(share[emptySpace:]) | ||
| if err != nil { | ||
| return 0, fmt.Errorf("write share to inner buffer: %w", err) | ||
| } | ||
| if n != len(share)-emptySpace { | ||
| return 0, fmt.Errorf("share was not written fully: %w", io.ErrShortWrite) | ||
| } | ||
| return written, nil | ||
| } | ||
| return written, nil | ||
| } | ||
|
|
||
| // ReadShares reads shares from the provided reader and constructs an Extended Data Square. Provided | ||
| // reader should contain shares in row-major order. | ||
| func ReadShares(r io.Reader, shareSize, odsSize int) ([]share.Share, error) { | ||
| shares := make([]share.Share, odsSize*odsSize) | ||
| var total int | ||
| for i := range shares { | ||
| share := make(share.Share, shareSize) | ||
| n, err := io.ReadFull(r, share) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("reading share: %w, bytes read: %v", err, total+n) | ||
| } | ||
| if n != shareSize { | ||
| return nil, fmt.Errorf("share size mismatch: expected %v, got %v", shareSize, n) | ||
| } | ||
| shares[i] = share | ||
| total += n | ||
| } | ||
| return shares, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| package eds | ||
|
|
||
| import ( | ||
| "errors" | ||
| "io" | ||
| "math/rand" | ||
| "testing" | ||
|
|
||
| "github.com/stretchr/testify/require" | ||
|
|
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| "github.com/celestiaorg/celestia-node/share" | ||
| "github.com/celestiaorg/celestia-node/share/eds/edstest" | ||
| ) | ||
|
|
||
| func TestSharesReader(t *testing.T) { | ||
| // create io.Writer that write random data | ||
| odsSize := 16 | ||
| eds := edstest.RandEDS(t, odsSize) | ||
| getShare := func(rowIdx, colIdx int) ([]byte, error) { | ||
| return eds.GetCell(uint(rowIdx), uint(colIdx)), nil | ||
| } | ||
|
|
||
| reader := NewSharesReader(odsSize, getShare) | ||
| readBytes, err := readWithRandomBuffer(reader, 1024) | ||
| require.NoError(t, err) | ||
| expected := make([]byte, 0, odsSize*odsSize*share.Size) | ||
| for _, share := range eds.FlattenedODS() { | ||
| expected = append(expected, share...) | ||
| } | ||
| require.Len(t, readBytes, len(expected)) | ||
| require.Equal(t, expected, readBytes) | ||
| } | ||
|
|
||
| // testRandReader reads from reader with buffers of random sizes. | ||
| func readWithRandomBuffer(reader io.Reader, maxBufSize int) ([]byte, error) { | ||
| // create buffer of random size | ||
| data := make([]byte, 0, maxBufSize) | ||
| for { | ||
| bufSize := rand.Intn(maxBufSize-1) + 1 | ||
| buf := make([]byte, bufSize) | ||
| n, err := reader.Read(buf) | ||
| if err != nil && !errors.Is(err, io.EOF) { | ||
| return nil, err | ||
| } | ||
| if n < bufSize { | ||
| buf = buf[:n] | ||
| } | ||
| data = append(data, buf...) | ||
| if errors.Is(err, io.EOF) { | ||
| break | ||
| } | ||
| } | ||
| return data, nil | ||
| } |
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