/
binary_reader.go
87 lines (79 loc) · 2.35 KB
/
binary_reader.go
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// Copyright 2019 StreamSets Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package binaryrecord
import (
"compress/gzip"
"github.com/streamsets/datacollector-edge/api"
"github.com/streamsets/datacollector-edge/api/dataformats"
"github.com/streamsets/datacollector-edge/container/common"
"github.com/streamsets/datacollector-edge/container/recordio"
"io"
)
type BinaryReaderFactoryImpl struct {
recordio.AbstractRecordReaderFactory
BinaryMaxObjectLen int
Compression string
}
func (b *BinaryReaderFactoryImpl) CreateReader(
context api.StageContext,
reader io.Reader,
messageId string,
) (dataformats.RecordReader, error) {
return newRecordReader(context, reader, messageId, b.BinaryMaxObjectLen, b.Compression)
}
type BinaryReaderImpl struct {
context api.StageContext
reader io.Reader
maxObjectLen int
messageId string
counter int
}
func (binaryReader *BinaryReaderImpl) ReadRecord() (api.Record, error) {
var err error
bytes := make([]byte, binaryReader.maxObjectLen)
n, err := binaryReader.reader.Read(bytes)
if err != nil && err != io.EOF {
return nil, err
}
if n > 0 {
binaryReader.counter++
sourceId := common.CreateRecordId(binaryReader.messageId, binaryReader.counter)
return binaryReader.context.CreateRecord(sourceId, bytes[:n])
}
return nil, nil
}
func (binaryReader *BinaryReaderImpl) Close() error {
return recordio.Close(binaryReader.reader)
}
func newRecordReader(
context api.StageContext,
reader io.Reader,
messageId string,
maxObjectLen int,
compression string,
) (*BinaryReaderImpl, error) {
if compression == recordio.CompressedFile {
var err error
reader, err = gzip.NewReader(reader)
if err != nil {
return nil, err
}
}
return &BinaryReaderImpl{
context: context,
reader: reader,
maxObjectLen: maxObjectLen,
messageId: messageId,
counter: 0,
}, nil
}