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/*
* MinIO Cloud Storage, (C) 2019 MinIO, 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 s3select
import (
"bufio"
"bytes"
"compress/bzip2"
"encoding/xml"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"strings"
"sync"
"github.com/minio/minio/pkg/s3select/csv"
"github.com/minio/minio/pkg/s3select/json"
"github.com/minio/minio/pkg/s3select/parquet"
"github.com/minio/minio/pkg/s3select/simdj"
"github.com/minio/minio/pkg/s3select/sql"
"github.com/minio/simdjson-go"
)
type recordReader interface {
// Read a record.
// dst is optional but will be used if valid.
Read(dst sql.Record) (sql.Record, error)
Close() error
}
const (
csvFormat = "csv"
jsonFormat = "json"
parquetFormat = "parquet"
)
// CompressionType - represents value inside <CompressionType/> in request XML.
type CompressionType string
const (
noneType CompressionType = "none"
gzipType CompressionType = "gzip"
bzip2Type CompressionType = "bzip2"
)
const (
maxRecordSize = 1 << 20 // 1 MiB
)
var bufPool = sync.Pool{
New: func() interface{} {
// make a buffer with a reasonable capacity.
return bytes.NewBuffer(make([]byte, 0, maxRecordSize))
},
}
var bufioWriterPool = sync.Pool{
New: func() interface{} {
// ioutil.Discard is just used to create the writer. Actual destination
// writer is set later by Reset() before using it.
return bufio.NewWriter(ioutil.Discard)
},
}
// UnmarshalXML - decodes XML data.
func (c *CompressionType) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
var s string
if err := d.DecodeElement(&s, &start); err != nil {
return errMalformedXML(err)
}
parsedType := CompressionType(strings.ToLower(s))
if s == "" {
parsedType = noneType
}
switch parsedType {
case noneType, gzipType, bzip2Type:
default:
return errInvalidCompressionFormat(fmt.Errorf("invalid compression format '%v'", s))
}
*c = parsedType
return nil
}
// InputSerialization - represents elements inside <InputSerialization/> in request XML.
type InputSerialization struct {
CompressionType CompressionType `xml:"CompressionType"`
CSVArgs csv.ReaderArgs `xml:"CSV"`
JSONArgs json.ReaderArgs `xml:"JSON"`
ParquetArgs parquet.ReaderArgs `xml:"Parquet"`
unmarshaled bool
format string
}
// IsEmpty - returns whether input serialization is empty or not.
func (input *InputSerialization) IsEmpty() bool {
return !input.unmarshaled
}
// UnmarshalXML - decodes XML data.
func (input *InputSerialization) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
// Make subtype to avoid recursive UnmarshalXML().
type subInputSerialization InputSerialization
parsedInput := subInputSerialization{}
if err := d.DecodeElement(&parsedInput, &start); err != nil {
return errMalformedXML(err)
}
// If no compression is specified, set to noneType
if parsedInput.CompressionType == CompressionType("") {
parsedInput.CompressionType = noneType
}
found := 0
if !parsedInput.CSVArgs.IsEmpty() {
parsedInput.format = csvFormat
found++
}
if !parsedInput.JSONArgs.IsEmpty() {
parsedInput.format = jsonFormat
found++
}
if !parsedInput.ParquetArgs.IsEmpty() {
if parsedInput.CompressionType != "" && parsedInput.CompressionType != noneType {
return errInvalidRequestParameter(fmt.Errorf("CompressionType must be NONE for Parquet format"))
}
parsedInput.format = parquetFormat
found++
}
if found != 1 {
return errInvalidDataSource(nil)
}
*input = InputSerialization(parsedInput)
input.unmarshaled = true
return nil
}
// OutputSerialization - represents elements inside <OutputSerialization/> in request XML.
type OutputSerialization struct {
CSVArgs csv.WriterArgs `xml:"CSV"`
JSONArgs json.WriterArgs `xml:"JSON"`
unmarshaled bool
format string
}
// IsEmpty - returns whether output serialization is empty or not.
func (output *OutputSerialization) IsEmpty() bool {
return !output.unmarshaled
}
// UnmarshalXML - decodes XML data.
func (output *OutputSerialization) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
// Make subtype to avoid recursive UnmarshalXML().
type subOutputSerialization OutputSerialization
parsedOutput := subOutputSerialization{}
if err := d.DecodeElement(&parsedOutput, &start); err != nil {
return errMalformedXML(err)
}
found := 0
if !parsedOutput.CSVArgs.IsEmpty() {
parsedOutput.format = csvFormat
found++
}
if !parsedOutput.JSONArgs.IsEmpty() {
parsedOutput.format = jsonFormat
found++
}
if found != 1 {
return errObjectSerializationConflict(fmt.Errorf("either CSV or JSON should be present in OutputSerialization"))
}
*output = OutputSerialization(parsedOutput)
output.unmarshaled = true
return nil
}
// RequestProgress - represents elements inside <RequestProgress/> in request XML.
type RequestProgress struct {
Enabled bool `xml:"Enabled"`
}
// S3Select - filters the contents on a simple structured query language (SQL) statement. It
// represents elements inside <SelectRequest/> in request XML specified in detail at
// https://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectSELECTContent.html.
type S3Select struct {
XMLName xml.Name `xml:"SelectRequest"`
Expression string `xml:"Expression"`
ExpressionType string `xml:"ExpressionType"`
Input InputSerialization `xml:"InputSerialization"`
Output OutputSerialization `xml:"OutputSerialization"`
Progress RequestProgress `xml:"RequestProgress"`
statement *sql.SelectStatement
progressReader *progressReader
recordReader recordReader
}
var (
legacyXMLName = "SelectObjectContentRequest"
)
// UnmarshalXML - decodes XML data.
func (s3Select *S3Select) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
// S3 also supports the older SelectObjectContentRequest tag,
// though it is no longer found in documentation. This is
// checked and renamed below to allow older clients to also
// work.
if start.Name.Local == legacyXMLName {
start.Name = xml.Name{Space: "", Local: "SelectRequest"}
}
// Make subtype to avoid recursive UnmarshalXML().
type subS3Select S3Select
parsedS3Select := subS3Select{}
if err := d.DecodeElement(&parsedS3Select, &start); err != nil {
if _, ok := err.(*s3Error); ok {
return err
}
return errMalformedXML(err)
}
parsedS3Select.ExpressionType = strings.ToLower(parsedS3Select.ExpressionType)
if parsedS3Select.ExpressionType != "sql" {
return errInvalidExpressionType(fmt.Errorf("invalid expression type '%v'", parsedS3Select.ExpressionType))
}
if parsedS3Select.Input.IsEmpty() {
return errMissingRequiredParameter(fmt.Errorf("InputSerialization must be provided"))
}
if parsedS3Select.Output.IsEmpty() {
return errMissingRequiredParameter(fmt.Errorf("OutputSerialization must be provided"))
}
statement, err := sql.ParseSelectStatement(parsedS3Select.Expression)
if err != nil {
return err
}
parsedS3Select.statement = &statement
*s3Select = S3Select(parsedS3Select)
return nil
}
func (s3Select *S3Select) outputRecord() sql.Record {
switch s3Select.Output.format {
case csvFormat:
return csv.NewRecord()
case jsonFormat:
return json.NewRecord(sql.SelectFmtJSON)
}
panic(fmt.Errorf("unknown output format '%v'", s3Select.Output.format))
}
func (s3Select *S3Select) getProgress() (bytesScanned, bytesProcessed int64) {
if s3Select.progressReader != nil {
return s3Select.progressReader.Stats()
}
return -1, -1
}
// Open - opens S3 object by using callback for SQL selection query.
// Currently CSV, JSON and Apache Parquet formats are supported.
func (s3Select *S3Select) Open(getReader func(offset, length int64) (io.ReadCloser, error)) error {
switch s3Select.Input.format {
case csvFormat:
rc, err := getReader(0, -1)
if err != nil {
return err
}
s3Select.progressReader, err = newProgressReader(rc, s3Select.Input.CompressionType)
if err != nil {
rc.Close()
return err
}
s3Select.recordReader, err = csv.NewReader(s3Select.progressReader, &s3Select.Input.CSVArgs)
if err != nil {
rc.Close()
var stErr bzip2.StructuralError
if errors.As(err, &stErr) {
return errInvalidBZIP2CompressionFormat(err)
}
return err
}
return nil
case jsonFormat:
rc, err := getReader(0, -1)
if err != nil {
return err
}
s3Select.progressReader, err = newProgressReader(rc, s3Select.Input.CompressionType)
if err != nil {
rc.Close()
return err
}
if strings.EqualFold(s3Select.Input.JSONArgs.ContentType, "lines") {
if simdjson.SupportedCPU() {
s3Select.recordReader = simdj.NewReader(s3Select.progressReader, &s3Select.Input.JSONArgs)
} else {
s3Select.recordReader = json.NewPReader(s3Select.progressReader, &s3Select.Input.JSONArgs)
}
} else {
s3Select.recordReader = json.NewReader(s3Select.progressReader, &s3Select.Input.JSONArgs)
}
return nil
case parquetFormat:
if !strings.EqualFold(os.Getenv("MINIO_API_SELECT_PARQUET"), "on") {
return errors.New("parquet format parsing not enabled on server")
}
var err error
s3Select.recordReader, err = parquet.NewReader(getReader, &s3Select.Input.ParquetArgs)
return err
}
panic(fmt.Errorf("unknown input format '%v'", s3Select.Input.format))
}
func (s3Select *S3Select) marshal(buf *bytes.Buffer, record sql.Record) error {
switch s3Select.Output.format {
case csvFormat:
// Use bufio Writer to prevent csv.Writer from allocating a new buffer.
bufioWriter := bufioWriterPool.Get().(*bufio.Writer)
defer func() {
bufioWriter.Reset(ioutil.Discard)
bufioWriterPool.Put(bufioWriter)
}()
bufioWriter.Reset(buf)
opts := sql.WriteCSVOpts{
FieldDelimiter: []rune(s3Select.Output.CSVArgs.FieldDelimiter)[0],
Quote: []rune(s3Select.Output.CSVArgs.QuoteCharacter)[0],
QuoteEscape: []rune(s3Select.Output.CSVArgs.QuoteEscapeCharacter)[0],
AlwaysQuote: strings.ToLower(s3Select.Output.CSVArgs.QuoteFields) == "always",
}
err := record.WriteCSV(bufioWriter, opts)
if err != nil {
return err
}
err = bufioWriter.Flush()
if err != nil {
return err
}
if buf.Bytes()[buf.Len()-1] == '\n' {
buf.Truncate(buf.Len() - 1)
}
buf.WriteString(s3Select.Output.CSVArgs.RecordDelimiter)
return nil
case jsonFormat:
err := record.WriteJSON(buf)
if err != nil {
return err
}
// Trim trailing newline from non-simd output
if buf.Bytes()[buf.Len()-1] == '\n' {
buf.Truncate(buf.Len() - 1)
}
buf.WriteString(s3Select.Output.JSONArgs.RecordDelimiter)
return nil
}
panic(fmt.Errorf("unknown output format '%v'", s3Select.Output.format))
}
// Evaluate - filters and sends records read from opened reader as per select statement to http response writer.
func (s3Select *S3Select) Evaluate(w http.ResponseWriter) {
getProgressFunc := s3Select.getProgress
if !s3Select.Progress.Enabled {
getProgressFunc = nil
}
writer := newMessageWriter(w, getProgressFunc)
var outputQueue []sql.Record
// Create queue based on the type.
if s3Select.statement.IsAggregated() {
outputQueue = make([]sql.Record, 0, 1)
} else {
outputQueue = make([]sql.Record, 0, 100)
}
var err error
sendRecord := func() bool {
buf := bufPool.Get().(*bytes.Buffer)
buf.Reset()
for _, outputRecord := range outputQueue {
if outputRecord == nil {
continue
}
before := buf.Len()
if err = s3Select.marshal(buf, outputRecord); err != nil {
bufPool.Put(buf)
return false
}
if buf.Len()-before > maxRecordSize {
writer.FinishWithError("OverMaxRecordSize", "The length of a record in the input or result is greater than maxCharsPerRecord of 1 MB.")
bufPool.Put(buf)
return false
}
}
if err = writer.SendRecord(buf); err != nil {
// FIXME: log this error.
err = nil
bufPool.Put(buf)
return false
}
outputQueue = outputQueue[:0]
return true
}
var rec sql.Record
OuterLoop:
for {
if s3Select.statement.LimitReached() {
if !sendRecord() {
break
}
if err = writer.Finish(s3Select.getProgress()); err != nil {
// FIXME: log this error.
err = nil
}
break
}
if rec, err = s3Select.recordReader.Read(rec); err != nil {
if err != io.EOF {
break
}
if s3Select.statement.IsAggregated() {
outputRecord := s3Select.outputRecord()
if err = s3Select.statement.AggregateResult(outputRecord); err != nil {
break
}
outputQueue = append(outputQueue, outputRecord)
}
if !sendRecord() {
break
}
if err = writer.Finish(s3Select.getProgress()); err != nil {
// FIXME: log this error.
err = nil
}
break
}
var inputRecords []*sql.Record
if inputRecords, err = s3Select.statement.EvalFrom(s3Select.Input.format, rec); err != nil {
break
}
for _, inputRecord := range inputRecords {
if s3Select.statement.IsAggregated() {
if err = s3Select.statement.AggregateRow(*inputRecord); err != nil {
break OuterLoop
}
} else {
var outputRecord sql.Record
// We will attempt to reuse the records in the table.
// The type of these should not change.
// The queue should always have at least one entry left for this to work.
outputQueue = outputQueue[:len(outputQueue)+1]
if t := outputQueue[len(outputQueue)-1]; t != nil {
// If the output record is already set, we reuse it.
outputRecord = t
outputRecord.Reset()
} else {
// Create new one
outputRecord = s3Select.outputRecord()
outputQueue[len(outputQueue)-1] = outputRecord
}
outputRecord, err = s3Select.statement.Eval(*inputRecord, outputRecord)
if outputRecord == nil || err != nil {
// This should not be written.
// Remove it from the queue.
outputQueue = outputQueue[:len(outputQueue)-1]
if err != nil {
break OuterLoop
}
continue
}
outputQueue[len(outputQueue)-1] = outputRecord
if len(outputQueue) < cap(outputQueue) {
continue
}
if !sendRecord() {
break OuterLoop
}
}
}
}
if err != nil {
_ = writer.FinishWithError("InternalError", err.Error())
}
}
// Close - closes opened S3 object.
func (s3Select *S3Select) Close() error {
return s3Select.recordReader.Close()
}
// NewS3Select - creates new S3Select by given request XML reader.
func NewS3Select(r io.Reader) (*S3Select, error) {
s3Select := &S3Select{}
if err := xml.NewDecoder(r).Decode(s3Select); err != nil {
return nil, err
}
return s3Select, nil
}
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