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move recordio to github.com/PaddlePaddle/recordio

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gangliao-patch-1
Helin Wang 8 years ago
parent 8c1ea31e8f
commit d0f1890db3
15 changed files with 2 additions and 1046 deletions
Show Stats Download Patch File Download Diff File

2
go/cmd/master/master.go
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@ -14,7 +14,7 @@ import (
"github.com/namsral/flag" "github.com/namsral/flag"
"github.com/PaddlePaddle/Paddle/go/master" "github.com/PaddlePaddle/Paddle/go/master"
"github.com/PaddlePaddle/Paddle/go/recordio" "github.com/PaddlePaddle/recordio"
) )
func main() { func main() {

2
go/master/service.go
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@ -6,7 +6,7 @@ import (
"sync" "sync"
"time" "time"
"github.com/PaddlePaddle/Paddle/go/recordio" "github.com/PaddlePaddle/recordio"
) )
const ( const (

39
go/recordio/README.md
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@ -1,39 +0,0 @@
# RecordIO
## Write
```go
f, e := os.Create("a_file.recordio")
w := recordio.NewWriter(f)
w.Write([]byte("Hello"))
w.Write([]byte("World!"))
w.Close()
f.Close()
```
## Read
1. Load chunk index:
```go
f, e := os.Open("a_file.recordio")
idx, e := recordio.LoadIndex(f)
fmt.Println("Total records: ", idx.Len())
f.Close()
```
2. Create one or more scanner to read a range of records. The
following example reads the range
[1, 3), i.e., the second and the third records:
```go
f, e := os.Open("a_file.recordio")
s := recrodio.NewScanner(f, idx, 1, 3)
for s.Scan() {
fmt.Println(string(s.Record()))
}
if s.Err() != nil {
log.Fatalf("Something wrong with scanning: %v", e)
}
f.Close()
```

13
go/recordio/c/CMakeLists.txt
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@ -1,13 +0,0 @@
cmake_minimum_required(VERSION 3.0)
get_filename_component(PARENT_DIR ${CMAKE_CURRENT_SOURCE_DIR} DIRECTORY)
get_filename_component(PARENT_DIR ${PARENT_DIR} DIRECTORY)
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${PARENT_DIR}/cmake")
project(cxx_go C Go)
include(golang)
include(flags)
go_library(recordio STATIC)
add_subdirectory(test)

116
go/recordio/c/crecordio.go
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@ -1,116 +0,0 @@
package main
/*
#include <string.h>
typedef int reader;
typedef int writer;
*/
import "C"
import (
"log"
"os"
"strings"
"unsafe"
"github.com/PaddlePaddle/Paddle/go/recordio"
)
var nullPtr = unsafe.Pointer(uintptr(0))
type writer struct {
w *recordio.Writer
f *os.File
}
type reader struct {
scanner *recordio.Scanner
}
func cArrayToSlice(p unsafe.Pointer, len int) []byte {
if p == nullPtr {
return nil
}
// create a Go clice backed by a C array, reference:
// https://github.com/golang/go/wiki/cgo#turning-c-arrays-into-go-slices
//
// Go garbage collector will not interact with this data, need
// to be freed properly.
return (*[1 << 30]byte)(p)[:len:len]
}
//export create_recordio_writer
func create_recordio_writer(path *C.char) C.writer {
p := C.GoString(path)
f, err := os.Create(p)
if err != nil {
log.Println(err)
return -1
}
w := recordio.NewWriter(f, -1, -1)
writer := &writer{f: f, w: w}
return addWriter(writer)
}
//export recordio_write
func recordio_write(writer C.writer, buf *C.uchar, size C.int) C.int {
w := getWriter(writer)
b := cArrayToSlice(unsafe.Pointer(buf), int(size))
c, err := w.w.Write(b)
if err != nil {
log.Println(err)
return -1
}
return C.int(c)
}
//export release_recordio_writer
func release_recordio_writer(writer C.writer) {
w := removeWriter(writer)
w.w.Close()
w.f.Close()
}
//export create_recordio_reader
func create_recordio_reader(path *C.char) C.reader {
p := C.GoString(path)
s, err := recordio.NewScanner(strings.Split(p, ",")...)
if err != nil {
log.Println(err)
return -1
}
r := &reader{scanner: s}
return addReader(r)
}
//export recordio_read
func recordio_read(reader C.reader, record **C.uchar) C.int {
r := getReader(reader)
if r.scanner.Scan() {
buf := r.scanner.Record()
if len(buf) == 0 {
*record = (*C.uchar)(nullPtr)
return 0
}
size := C.int(len(buf))
*record = (*C.uchar)(C.malloc(C.size_t(len(buf))))
C.memcpy(unsafe.Pointer(*record), unsafe.Pointer(&buf[0]), C.size_t(len(buf)))
return size
}
return -1
}
//export release_recordio_reader
func release_recordio_reader(reader C.reader) {
r := removeReader(reader)
r.scanner.Close()
}
func main() {} // Required but ignored

61
go/recordio/c/register.go
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@ -1,61 +0,0 @@
package main
/*
typedef int reader;
typedef int writer;
*/
import "C"
import "sync"
var mu sync.Mutex
var handleMap = make(map[C.reader]*reader)
var curHandle C.reader
var writerMap = make(map[C.writer]*writer)
var curWriterHandle C.writer
func addReader(r *reader) C.reader {
mu.Lock()
defer mu.Unlock()
reader := curHandle
curHandle++
handleMap[reader] = r
return reader
}
func getReader(reader C.reader) *reader {
mu.Lock()
defer mu.Unlock()
return handleMap[reader]
}
func removeReader(reader C.reader) *reader {
mu.Lock()
defer mu.Unlock()
r := handleMap[reader]
delete(handleMap, reader)
return r
}
func addWriter(w *writer) C.writer {
mu.Lock()
defer mu.Unlock()
writer := curWriterHandle
curWriterHandle++
writerMap[writer] = w
return writer
}
func getWriter(writer C.writer) *writer {
mu.Lock()
defer mu.Unlock()
return writerMap[writer]
}
func removeWriter(writer C.writer) *writer {
mu.Lock()
defer mu.Unlock()
w := writerMap[writer]
delete(writerMap, writer)
return w
}

8
go/recordio/c/test/CMakeLists.txt
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@ -1,8 +0,0 @@
cmake_minimum_required(VERSION 3.0)
include_directories(${CMAKE_BINARY_DIR})
add_executable(recordio_test test.c)
add_dependencies(recordio_test recordio)
set (CMAKE_EXE_LINKER_FLAGS "-pthread")
target_link_libraries(recordio_test ${CMAKE_BINARY_DIR}/librecordio.a)

56
go/recordio/c/test/test.c
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@ -1,56 +0,0 @@
#include <stdio.h>
#include <stdlib.h>
#include "librecordio.h"
void fail() {
// TODO(helin): fix: gtest using cmake is not working, using this
// hacky way for now.
printf("test failed.\n");
exit(-1);
}
int main() {
writer w = create_recordio_writer("/tmp/test_recordio_0");
recordio_write(w, "hello", 6);
recordio_write(w, "hi", 3);
release_recordio_writer(w);
w = create_recordio_writer("/tmp/test_recordio_1");
recordio_write(w, "dog", 4);
recordio_write(w, "cat", 4);
release_recordio_writer(w);
reader r = create_recordio_reader("/tmp/test_recordio_*");
unsigned char* item = NULL;
int size = recordio_read(r, &item);
if (strcmp(item, "hello") || size != 6) {
fail();
}
free(item);
size = recordio_read(r, &item);
if (strcmp(item, "hi") || size != 3) {
fail();
}
free(item);
size = recordio_read(r, &item);
if (strcmp(item, "dog") || size != 4) {
fail();
}
free(item);
size = recordio_read(r, &item);
if (strcmp(item, "cat") || size != 4) {
fail();
}
free(item);
size = recordio_read(r, &item);
if (size != -1) {
fail();
}
release_recordio_reader(r);
}

181
go/recordio/chunk.go
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@ -1,181 +0,0 @@
package recordio
import (
"bytes"
"compress/gzip"
"encoding/binary"
"fmt"
"hash/crc32"
"io"
"github.com/golang/snappy"
)
// A Chunk contains the Header and optionally compressed records. To
// create a chunk, just use ch := &Chunk{}.
type Chunk struct {
records [][]byte
numBytes int // sum of record lengths.
}
func (ch *Chunk) add(record []byte) {
ch.records = append(ch.records, record)
ch.numBytes += len(record)
}
// dump the chunk into w, and clears the chunk and makes it ready for
// the next add invocation.
func (ch *Chunk) dump(w io.Writer, compressorIndex int) error {
// NOTE: don't check ch.numBytes instead, because empty
// records are allowed.
if len(ch.records) == 0 {
return nil
}
// Write raw records and their lengths into data buffer.
var data bytes.Buffer
for _, r := range ch.records {
var rs [4]byte
binary.LittleEndian.PutUint32(rs[:], uint32(len(r)))
if _, e := data.Write(rs[:]); e != nil {
return fmt.Errorf("Failed to write record length: %v", e)
}
if _, e := data.Write(r); e != nil {
return fmt.Errorf("Failed to write record: %v", e)
}
}
compressed, e := compressData(&data, compressorIndex)
if e != nil {
return e
}
// Write chunk header and compressed data.
hdr := &Header{
checkSum: crc32.ChecksumIEEE(compressed.Bytes()),
compressor: uint32(compressorIndex),
compressedSize: uint32(compressed.Len()),
numRecords: uint32(len(ch.records)),
}
if _, e := hdr.write(w); e != nil {
return fmt.Errorf("Failed to write chunk header: %v", e)
}
if _, e := w.Write(compressed.Bytes()); e != nil {
return fmt.Errorf("Failed to write chunk data: %v", e)
}
// Clear the current chunk.
ch.records = nil
ch.numBytes = 0
return nil
}
type noopCompressor struct {
*bytes.Buffer
}
func (c *noopCompressor) Close() error {
return nil
}
func compressData(src io.Reader, compressorIndex int) (*bytes.Buffer, error) {
compressed := new(bytes.Buffer)
var compressor io.WriteCloser
switch compressorIndex {
case NoCompression:
compressor = &noopCompressor{compressed}
case Snappy:
compressor = snappy.NewBufferedWriter(compressed)
case Gzip:
compressor = gzip.NewWriter(compressed)
default:
return nil, fmt.Errorf("Unknown compression algorithm: %d", compressorIndex)
}
if _, e := io.Copy(compressor, src); e != nil {
return nil, fmt.Errorf("Failed to compress chunk data: %v", e)
}
compressor.Close()
return compressed, nil
}
// parse the specified chunk from r.
func parseChunk(r io.ReadSeeker, chunkOffset int64) (*Chunk, error) {
var e error
var hdr *Header
if _, e = r.Seek(chunkOffset, io.SeekStart); e != nil {
return nil, fmt.Errorf("Failed to seek chunk: %v", e)
}
hdr, e = parseHeader(r)
if e != nil {
return nil, fmt.Errorf("Failed to parse chunk header: %v", e)
}
var buf bytes.Buffer
if _, e = io.CopyN(&buf, r, int64(hdr.compressedSize)); e != nil {
return nil, fmt.Errorf("Failed to read chunk data: %v", e)
}
if hdr.checkSum != crc32.ChecksumIEEE(buf.Bytes()) {
return nil, fmt.Errorf("Checksum checking failed.")
}
deflated, e := deflateData(&buf, int(hdr.compressor))
if e != nil {
return nil, e
}
ch := &Chunk{}
for i := 0; i < int(hdr.numRecords); i++ {
var rs [4]byte
if _, e = deflated.Read(rs[:]); e != nil {
return nil, fmt.Errorf("Failed to read record length: %v", e)
}
r := make([]byte, binary.LittleEndian.Uint32(rs[:]))
if _, e = deflated.Read(r); e != nil {
return nil, fmt.Errorf("Failed to read a record: %v", e)
}
ch.records = append(ch.records, r)
ch.numBytes += len(r)
}
return ch, nil
}
func deflateData(src io.Reader, compressorIndex int) (*bytes.Buffer, error) {
var e error
var deflator io.Reader
switch compressorIndex {
case NoCompression:
deflator = src
case Snappy:
deflator = snappy.NewReader(src)
case Gzip:
deflator, e = gzip.NewReader(src)
if e != nil {
return nil, fmt.Errorf("Failed to create gzip reader: %v", e)
}
default:
return nil, fmt.Errorf("Unknown compression algorithm: %d", compressorIndex)
}
deflated := new(bytes.Buffer)
if _, e = io.Copy(deflated, deflator); e != nil {
return nil, fmt.Errorf("Failed to deflate chunk data: %v", e)
}
return deflated, nil
}

59
go/recordio/header.go
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@ -1,59 +0,0 @@
package recordio
import (
"encoding/binary"
"fmt"
"io"
)
const (
// NoCompression means writing raw chunk data into files.
// With other choices, chunks are compressed before written.
NoCompression = iota
// Snappy had been the default compressing algorithm widely
// used in Google. It compromises between speech and
// compression ratio.
Snappy
// Gzip is a well-known compression algorithm. It is
// recommmended only you are looking for compression ratio.
Gzip
magicNumber uint32 = 0x01020304
defaultCompressor = Snappy
)
// Header is the metadata of Chunk.
type Header struct {
checkSum uint32
compressor uint32
compressedSize uint32
numRecords uint32
}
func (c *Header) write(w io.Writer) (int, error) {
var buf [20]byte
binary.LittleEndian.PutUint32(buf[0:4], magicNumber)
binary.LittleEndian.PutUint32(buf[4:8], c.checkSum)
binary.LittleEndian.PutUint32(buf[8:12], c.compressor)
binary.LittleEndian.PutUint32(buf[12:16], c.compressedSize)
binary.LittleEndian.PutUint32(buf[16:20], c.numRecords)
return w.Write(buf[:])
}
func parseHeader(r io.Reader) (*Header, error) {
var buf [20]byte
if _, e := r.Read(buf[:]); e != nil {
return nil, e
}
if v := binary.LittleEndian.Uint32(buf[0:4]); v != magicNumber {
return nil, fmt.Errorf("Failed to parse magic number")
}
return &Header{
checkSum: binary.LittleEndian.Uint32(buf[4:8]),
compressor: binary.LittleEndian.Uint32(buf[8:12]),
compressedSize: binary.LittleEndian.Uint32(buf[12:16]),
numRecords: binary.LittleEndian.Uint32(buf[16:20]),
}, nil
}

140
go/recordio/range_scanner.go
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@ -1,140 +0,0 @@
package recordio
import "io"
// Index consists offsets and sizes of the consequetive chunks in a RecordIO file.
type Index struct {
chunkOffsets []int64
chunkLens []uint32
numRecords int // the number of all records in a file.
chunkRecords []int // the number of records in chunks.
}
// LoadIndex scans the file and parse chunkOffsets, chunkLens, and len.
func LoadIndex(r io.ReadSeeker) (*Index, error) {
f := &Index{}
offset := int64(0)
var e error
var hdr *Header
for {
hdr, e = parseHeader(r)
if e != nil {
break
}
f.chunkOffsets = append(f.chunkOffsets, offset)
f.chunkLens = append(f.chunkLens, hdr.numRecords)
f.chunkRecords = append(f.chunkRecords, int(hdr.numRecords))
f.numRecords += int(hdr.numRecords)
offset, e = r.Seek(int64(hdr.compressedSize), io.SeekCurrent)
if e != nil {
break
}
}
if e == io.EOF {
return f, nil
}
return nil, e
}
// NumRecords returns the total number of records in a RecordIO file.
func (r *Index) NumRecords() int {
return r.numRecords
}
// NumChunks returns the total number of chunks in a RecordIO file.
func (r *Index) NumChunks() int {
return len(r.chunkLens)
}
// ChunkIndex return the Index of i-th Chunk.
func (r *Index) ChunkIndex(i int) *Index {
idx := &Index{}
idx.chunkOffsets = []int64{r.chunkOffsets[i]}
idx.chunkLens = []uint32{r.chunkLens[i]}
idx.chunkRecords = []int{r.chunkRecords[i]}
idx.numRecords = idx.chunkRecords[0]
return idx
}
// Locate returns the index of chunk that contains the given record,
// and the record index within the chunk. It returns (-1, -1) if the
// record is out of range.
func (r *Index) Locate(recordIndex int) (int, int) {
sum := 0
for i, l := range r.chunkLens {
sum += int(l)
if recordIndex < sum {
return i, recordIndex - sum + int(l)
}
}
return -1, -1
}
// RangeScanner scans records in a specified range within [0, numRecords).
type RangeScanner struct {
reader io.ReadSeeker
index *Index
start, end, cur int
chunkIndex int
chunk *Chunk
err error
}
// NewRangeScanner creates a scanner that sequencially reads records in the
// range [start, start+len). If start < 0, it scans from the
// beginning. If len < 0, it scans till the end of file.
func NewRangeScanner(r io.ReadSeeker, index *Index, start, len int) *RangeScanner {
if start < 0 {
start = 0
}
if len < 0 || start+len >= index.NumRecords() {
len = index.NumRecords() - start
}
return &RangeScanner{
reader: r,
index: index,
start: start,
end: start + len,
cur: start - 1, // The intial status required by Scan.
chunkIndex: -1,
chunk: &Chunk{},
}
}
// Scan moves the cursor forward for one record and loads the chunk
// containing the record if not yet.
func (s *RangeScanner) Scan() bool {
s.cur++
if s.cur >= s.end {
s.err = io.EOF
} else {
if ci, _ := s.index.Locate(s.cur); s.chunkIndex != ci {
s.chunkIndex = ci
s.chunk, s.err = parseChunk(s.reader, s.index.chunkOffsets[ci])
}
}
return s.err == nil
}
// Record returns the record under the current cursor.
func (s *RangeScanner) Record() []byte {
_, ri := s.index.Locate(s.cur)
return s.chunk.records[ri]
}
// Err returns the first non-EOF error that was encountered by the
// Scanner.
func (s *RangeScanner) Err() error {
if s.err == io.EOF {
return nil
}
return s.err
}

90
go/recordio/recordio_internal_test.go
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@ -1,90 +0,0 @@
package recordio
import (
"bytes"
"testing"
"unsafe"
"github.com/stretchr/testify/assert"
)
func TestChunkHead(t *testing.T) {
assert := assert.New(t)
c := &Header{
checkSum: 123,
compressor: 456,
compressedSize: 789,
}
var buf bytes.Buffer
_, e := c.write(&buf)
assert.Nil(e)
cc, e := parseHeader(&buf)
assert.Nil(e)
assert.Equal(c, cc)
}
func TestWriteAndRead(t *testing.T) {
assert := assert.New(t)
data := []string{
"12345",
"1234",
"12"}
var buf bytes.Buffer
w := NewWriter(&buf, 10, NoCompression) // use a small maxChunkSize.
n, e := w.Write([]byte(data[0])) // not exceed chunk size.
assert.Nil(e)
assert.Equal(5, n)
n, e = w.Write([]byte(data[1])) // not exceed chunk size.
assert.Nil(e)
assert.Equal(4, n)
n, e = w.Write([]byte(data[2])) // exeeds chunk size, dump and create a new chunk.
assert.Nil(e)
assert.Equal(n, 2)
assert.Nil(w.Close()) // flush the second chunk.
assert.Nil(w.Writer)
n, e = w.Write([]byte("anything")) // not effective after close.
assert.NotNil(e)
assert.Equal(n, 0)
idx, e := LoadIndex(bytes.NewReader(buf.Bytes()))
assert.Nil(e)
assert.Equal([]uint32{2, 1}, idx.chunkLens)
assert.Equal(
[]int64{0,
int64(4 + // magic number
unsafe.Sizeof(Header{}) +
5 + // first record
4 + // second record
2*4)}, // two record legnths
idx.chunkOffsets)
s := NewRangeScanner(bytes.NewReader(buf.Bytes()), idx, -1, -1)
i := 0
for s.Scan() {
assert.Equal(data[i], string(s.Record()))
i++
}
}
func TestWriteEmptyFile(t *testing.T) {
assert := assert.New(t)
var buf bytes.Buffer
w := NewWriter(&buf, 10, NoCompression) // use a small maxChunkSize.
assert.Nil(w.Close())
assert.Equal(0, buf.Len())
idx, e := LoadIndex(bytes.NewReader(buf.Bytes()))
assert.Nil(e)
assert.Equal(0, idx.NumRecords())
}

81
go/recordio/recordio_test.go
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@ -1,81 +0,0 @@
package recordio_test
import (
"bytes"
"reflect"
"testing"
"github.com/PaddlePaddle/Paddle/go/recordio"
)
func TestWriteRead(t *testing.T) {
const total = 1000
var buf bytes.Buffer
w := recordio.NewWriter(&buf, 0, -1)
for i := 0; i < total; i++ {
_, err := w.Write(make([]byte, i))
if err != nil {
t.Fatal(err)
}
}
w.Close()
idx, err := recordio.LoadIndex(bytes.NewReader(buf.Bytes()))
if err != nil {
t.Fatal(err)
}
if idx.NumRecords() != total {
t.Fatal("num record does not match:", idx.NumRecords(), total)
}
s := recordio.NewRangeScanner(bytes.NewReader(buf.Bytes()), idx, -1, -1)
i := 0
for s.Scan() {
if !reflect.DeepEqual(s.Record(), make([]byte, i)) {
t.Fatal("not equal:", len(s.Record()), len(make([]byte, i)))
}
i++
}
if i != total {
t.Fatal("total count not match:", i, total)
}
}
func TestChunkIndex(t *testing.T) {
const total = 1000
var buf bytes.Buffer
w := recordio.NewWriter(&buf, 0, -1)
for i := 0; i < total; i++ {
_, err := w.Write(make([]byte, i))
if err != nil {
t.Fatal(err)
}
}
w.Close()
idx, err := recordio.LoadIndex(bytes.NewReader(buf.Bytes()))
if err != nil {
t.Fatal(err)
}
if idx.NumChunks() != total {
t.Fatal("unexpected chunk num:", idx.NumChunks(), total)
}
for i := 0; i < total; i++ {
newIdx := idx.ChunkIndex(i)
s := recordio.NewRangeScanner(bytes.NewReader(buf.Bytes()), newIdx, -1, -1)
j := 0
for s.Scan() {
if !reflect.DeepEqual(s.Record(), make([]byte, i)) {
t.Fatal("not equal:", len(s.Record()), len(make([]byte, i)))
}
j++
}
if j != 1 {
t.Fatal("unexpected record per chunk:", j)
}
}
}

140
go/recordio/scanner.go
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@ -1,140 +0,0 @@
package recordio
import (
"fmt"
"os"
"path/filepath"
)
// Scanner is a scanner for multiple recordio files.
type Scanner struct {
paths []string
curFile *os.File
curScanner *RangeScanner
pathIdx int
end bool
err error
}
// NewScanner creates a new Scanner.
func NewScanner(paths ...string) (*Scanner, error) {
var ps []string
for _, s := range paths {
match, err := filepath.Glob(s)
if err != nil {
return nil, err
}
ps = append(ps, match...)
}
if len(ps) == 0 {
return nil, fmt.Errorf("no valid path provided: %v", paths)
}
return &Scanner{paths: ps}, nil
}
// Scan moves the cursor forward for one record and loads the chunk
// containing the record if not yet.
func (s *Scanner) Scan() bool {
if s.err != nil {
return false
}
if s.end {
return false
}
if s.curScanner == nil {
more, err := s.nextFile()
if err != nil {
s.err = err
return false
}
if !more {
s.end = true
return false
}
}
curMore := s.curScanner.Scan()
s.err = s.curScanner.Err()
if s.err != nil {
return curMore
}
if !curMore {
err := s.curFile.Close()
if err != nil {
s.err = err
return false
}
s.curFile = nil
more, err := s.nextFile()
if err != nil {
s.err = err
return false
}
if !more {
s.end = true
return false
}
return s.Scan()
}
return true
}
// Err returns the first non-EOF error that was encountered by the
// Scanner.
func (s *Scanner) Err() error {
return s.err
}
// Record returns the record under the current cursor.
func (s *Scanner) Record() []byte {
if s.curScanner == nil {
return nil
}
return s.curScanner.Record()
}
// Close release the resources.
func (s *Scanner) Close() error {
s.curScanner = nil
if s.curFile != nil {
err := s.curFile.Close()
s.curFile = nil
return err
}
return nil
}
func (s *Scanner) nextFile() (bool, error) {
if s.pathIdx >= len(s.paths) {
return false, nil
}
path := s.paths[s.pathIdx]
s.pathIdx++
f, err := os.Open(path)
if err != nil {
return false, err
}
idx, err := LoadIndex(f)
if err != nil {
f.Close()
return false, err
}
s.curFile = f
s.curScanner = NewRangeScanner(f, idx, 0, -1)
return true, nil
}

60
go/recordio/writer.go
Unescape View File

@ -1,60 +0,0 @@
package recordio
import (
"fmt"
"io"
)
const (
defaultMaxChunkSize = 32 * 1024 * 1024
)
// Writer creates a RecordIO file.
type Writer struct {
io.Writer // Set to nil to mark a closed writer.
chunk *Chunk
maxChunkSize int // total records size, excluding metadata, before compression.
compressor int
}
// NewWriter creates a RecordIO file writer. Each chunk is compressed
// using the deflate algorithm given compression level. Note that
// level 0 means no compression and -1 means default compression.
func NewWriter(w io.Writer, maxChunkSize, compressor int) *Writer {
if maxChunkSize < 0 {
maxChunkSize = defaultMaxChunkSize
}
if compressor < 0 {
compressor = defaultCompressor
}
return &Writer{
Writer: w,
chunk: &Chunk{},
maxChunkSize: maxChunkSize,
compressor: compressor}
}
// Writes a record. It returns an error if Close has been called.
func (w *Writer) Write(record []byte) (int, error) {
if w.Writer == nil {
return 0, fmt.Errorf("Cannot write since writer had been closed")
}
if w.chunk.numBytes+len(record) > w.maxChunkSize {
if e := w.chunk.dump(w.Writer, w.compressor); e != nil {
return 0, e
}
}
w.chunk.add(record)
return len(record), nil
}
// Close flushes the current chunk and makes the writer invalid.
func (w *Writer) Close() error {
e := w.chunk.dump(w.Writer, w.compressor)
w.Writer = nil
return e
}
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