f4879ed96d
- Also, switch to jstream to generate internal record representation from CSV/JSON readers - This fixes a bug in which JSON output objects have their keys reversed from the order they are specified in the Select columns. - Also includes a fix for tests.
139 lines
3.3 KiB
Go
139 lines
3.3 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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"bytes"
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"encoding/csv"
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"encoding/json"
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"errors"
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"fmt"
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"strings"
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"github.com/bcicen/jstream"
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"github.com/minio/minio/pkg/s3select/sql"
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"github.com/tidwall/gjson"
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)
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// RawJSON is a byte-slice that contains valid JSON
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type RawJSON []byte
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// MarshalJSON instance for []byte that assumes that byte-slice is
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// already serialized JSON
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func (b RawJSON) MarshalJSON() ([]byte, error) {
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return b, nil
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}
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// Record - is JSON record.
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type Record struct {
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// Used in Get()
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Data []byte
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// Used in Set(), Marshal*()
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kvs jstream.KVS
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}
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// Get - gets the value for a column name.
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func (r *Record) Get(name string) (*sql.Value, error) {
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result := gjson.GetBytes(r.Data, name)
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switch result.Type {
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case gjson.Null:
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return sql.FromNull(), nil
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case gjson.False:
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return sql.FromBool(false), nil
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case gjson.Number:
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return sql.FromFloat(result.Float()), nil
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case gjson.String:
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return sql.FromString(result.String()), nil
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case gjson.True:
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return sql.FromBool(true), nil
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}
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return nil, fmt.Errorf("unsupported gjson value %v; %v", result, result.Type)
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}
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// Set - sets the value for a column name.
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func (r *Record) Set(name string, value *sql.Value) (err error) {
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var v interface{}
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if b, ok := value.ToBool(); ok {
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v = b
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} else if f, ok := value.ToFloat(); ok {
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v = f
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} else if i, ok := value.ToInt(); ok {
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v = i
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} else if t, ok := value.ToTimestamp(); ok {
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v = sql.FormatSQLTimestamp(t)
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} else if s, ok := value.ToString(); ok {
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v = s
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} else if value.IsNull() {
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v = nil
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} else if b, ok := value.ToBytes(); ok {
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v = RawJSON(b)
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} else {
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return fmt.Errorf("unsupported sql value %v and type %v", value, value.GetTypeString())
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}
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name = strings.Replace(name, "*", "__ALL__", -1)
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r.kvs = append(r.kvs, jstream.KV{Key: name, Value: v})
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return err
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}
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// MarshalCSV - encodes to CSV data.
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func (r *Record) MarshalCSV(fieldDelimiter rune) ([]byte, error) {
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var csvRecord []string
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for _, kv := range r.kvs {
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var columnValue string
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switch val := kv.Value.(type) {
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case bool, float64, int64, string:
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columnValue = fmt.Sprintf("%v", val)
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case nil:
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columnValue = ""
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case RawJSON:
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columnValue = string([]byte(val))
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default:
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return nil, errors.New("Cannot marshal unhandled type")
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}
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csvRecord = append(csvRecord, columnValue)
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}
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buf := new(bytes.Buffer)
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w := csv.NewWriter(buf)
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w.Comma = fieldDelimiter
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if err := w.Write(csvRecord); err != nil {
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return nil, err
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}
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w.Flush()
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if err := w.Error(); err != nil {
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return nil, err
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}
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data := buf.Bytes()
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return data[:len(data)-1], nil
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}
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// MarshalJSON - encodes to JSON data.
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func (r *Record) MarshalJSON() ([]byte, error) {
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return json.Marshal(r.kvs)
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}
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// NewRecord - creates new empty JSON record.
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func NewRecord() *Record {
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return &Record{
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Data: []byte("{}"),
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}
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}
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