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85e939636f
This PR also adds some comments and simplifies the code. Primary handling is done to ensure that we make sure to honor cached buffer. Added unit tests as well Fixes #7141
82 lines
1.9 KiB
Go
82 lines
1.9 KiB
Go
/*
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* Minio Cloud Storage, (C) 2019 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package json
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import (
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"encoding/json"
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"io"
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"github.com/minio/minio/pkg/s3select/sql"
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"github.com/bcicen/jstream"
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"github.com/tidwall/sjson"
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)
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// Reader - JSON record reader for S3Select.
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type Reader struct {
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args *ReaderArgs
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decoder *jstream.Decoder
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valueCh chan *jstream.MetaValue
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readCloser io.ReadCloser
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}
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// Read - reads single record.
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func (r *Reader) Read() (sql.Record, error) {
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v, ok := <-r.valueCh
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if !ok {
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if err := r.decoder.Err(); err != nil {
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return nil, errJSONParsingError(err)
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}
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return nil, io.EOF
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}
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var data []byte
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var err error
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if v.ValueType == jstream.Object {
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data, err = json.Marshal(v.Value)
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} else {
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// To be AWS S3 compatible
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// Select for JSON needs to output non-object JSON as single column value
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// i.e. a map with `_1` as key and value as the non-object.
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data, err = sjson.SetBytes(data, "_1", v.Value)
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}
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if err != nil {
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return nil, errJSONParsingError(err)
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}
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return &Record{
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data: data,
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}, nil
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}
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// Close - closes underlaying reader.
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func (r *Reader) Close() error {
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return r.readCloser.Close()
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}
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// NewReader - creates new JSON reader using readCloser.
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func NewReader(readCloser io.ReadCloser, args *ReaderArgs) *Reader {
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d := jstream.NewDecoder(readCloser, 0)
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return &Reader{
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args: args,
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decoder: d,
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valueCh: d.Stream(),
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readCloser: readCloser,
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}
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}
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