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435 lines
11 KiB
435 lines
11 KiB
/*
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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 s3select
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import (
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"encoding/xml"
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"fmt"
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"io"
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"net/http"
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"strings"
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"github.com/minio/minio/pkg/s3select/csv"
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"github.com/minio/minio/pkg/s3select/json"
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"github.com/minio/minio/pkg/s3select/parquet"
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"github.com/minio/minio/pkg/s3select/sql"
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)
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type recordReader interface {
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Read() (sql.Record, error)
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Close() error
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}
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const (
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csvFormat = "csv"
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jsonFormat = "json"
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parquetFormat = "parquet"
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)
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// CompressionType - represents value inside <CompressionType/> in request XML.
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type CompressionType string
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const (
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noneType CompressionType = "none"
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gzipType CompressionType = "gzip"
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bzip2Type CompressionType = "bzip2"
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)
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const (
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maxRecordSize = 1 << 20 // 1 MiB
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)
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// UnmarshalXML - decodes XML data.
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func (c *CompressionType) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
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var s string
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if err := d.DecodeElement(&s, &start); err != nil {
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return errMalformedXML(err)
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}
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parsedType := CompressionType(strings.ToLower(s))
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if s == "" {
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parsedType = noneType
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}
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switch parsedType {
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case noneType, gzipType, bzip2Type:
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default:
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return errInvalidCompressionFormat(fmt.Errorf("invalid compression format '%v'", s))
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}
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*c = parsedType
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return nil
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}
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// InputSerialization - represents elements inside <InputSerialization/> in request XML.
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type InputSerialization struct {
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CompressionType CompressionType `xml:"CompressionType"`
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CSVArgs csv.ReaderArgs `xml:"CSV"`
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JSONArgs json.ReaderArgs `xml:"JSON"`
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ParquetArgs parquet.ReaderArgs `xml:"Parquet"`
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unmarshaled bool
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format string
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}
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// IsEmpty - returns whether input serialization is empty or not.
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func (input *InputSerialization) IsEmpty() bool {
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return !input.unmarshaled
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}
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// UnmarshalXML - decodes XML data.
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func (input *InputSerialization) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
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// Make subtype to avoid recursive UnmarshalXML().
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type subInputSerialization InputSerialization
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parsedInput := subInputSerialization{}
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if err := d.DecodeElement(&parsedInput, &start); err != nil {
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return errMalformedXML(err)
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}
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// If no compression is specified, set to noneType
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if parsedInput.CompressionType == CompressionType("") {
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parsedInput.CompressionType = noneType
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}
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found := 0
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if !parsedInput.CSVArgs.IsEmpty() {
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parsedInput.format = csvFormat
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found++
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}
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if !parsedInput.JSONArgs.IsEmpty() {
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parsedInput.format = jsonFormat
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found++
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}
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if !parsedInput.ParquetArgs.IsEmpty() {
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if parsedInput.CompressionType != "" && parsedInput.CompressionType != noneType {
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return errInvalidRequestParameter(fmt.Errorf("CompressionType must be NONE for Parquet format"))
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}
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parsedInput.format = parquetFormat
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found++
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}
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if found != 1 {
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return errInvalidDataSource(nil)
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}
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*input = InputSerialization(parsedInput)
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input.unmarshaled = true
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return nil
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}
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// OutputSerialization - represents elements inside <OutputSerialization/> in request XML.
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type OutputSerialization struct {
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CSVArgs csv.WriterArgs `xml:"CSV"`
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JSONArgs json.WriterArgs `xml:"JSON"`
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unmarshaled bool
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format string
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}
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// IsEmpty - returns whether output serialization is empty or not.
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func (output *OutputSerialization) IsEmpty() bool {
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return !output.unmarshaled
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}
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// UnmarshalXML - decodes XML data.
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func (output *OutputSerialization) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
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// Make subtype to avoid recursive UnmarshalXML().
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type subOutputSerialization OutputSerialization
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parsedOutput := subOutputSerialization{}
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if err := d.DecodeElement(&parsedOutput, &start); err != nil {
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return errMalformedXML(err)
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}
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found := 0
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if !parsedOutput.CSVArgs.IsEmpty() {
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parsedOutput.format = csvFormat
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found++
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}
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if !parsedOutput.JSONArgs.IsEmpty() {
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parsedOutput.format = jsonFormat
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found++
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}
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if found != 1 {
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return errObjectSerializationConflict(fmt.Errorf("either CSV or JSON should be present in OutputSerialization"))
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}
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*output = OutputSerialization(parsedOutput)
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output.unmarshaled = true
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return nil
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}
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// RequestProgress - represents elements inside <RequestProgress/> in request XML.
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type RequestProgress struct {
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Enabled bool `xml:"Enabled"`
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}
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// S3Select - filters the contents on a simple structured query language (SQL) statement. It
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// represents elements inside <SelectRequest/> in request XML specified in detail at
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// https://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectSELECTContent.html.
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type S3Select struct {
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XMLName xml.Name `xml:"SelectRequest"`
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Expression string `xml:"Expression"`
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ExpressionType string `xml:"ExpressionType"`
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Input InputSerialization `xml:"InputSerialization"`
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Output OutputSerialization `xml:"OutputSerialization"`
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Progress RequestProgress `xml:"RequestProgress"`
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statement *sql.SelectStatement
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progressReader *progressReader
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recordReader recordReader
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}
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var (
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legacyXMLName = "SelectObjectContentRequest"
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)
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// UnmarshalXML - decodes XML data.
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func (s3Select *S3Select) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
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// S3 also supports the older SelectObjectContentRequest tag,
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// though it is no longer found in documentation. This is
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// checked and renamed below to allow older clients to also
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// work.
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if start.Name.Local == legacyXMLName {
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start.Name = xml.Name{Space: "", Local: "SelectRequest"}
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}
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// Make subtype to avoid recursive UnmarshalXML().
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type subS3Select S3Select
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parsedS3Select := subS3Select{}
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if err := d.DecodeElement(&parsedS3Select, &start); err != nil {
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if _, ok := err.(*s3Error); ok {
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return err
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}
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return errMalformedXML(err)
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}
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parsedS3Select.ExpressionType = strings.ToLower(parsedS3Select.ExpressionType)
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if parsedS3Select.ExpressionType != "sql" {
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return errInvalidExpressionType(fmt.Errorf("invalid expression type '%v'", parsedS3Select.ExpressionType))
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}
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if parsedS3Select.Input.IsEmpty() {
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return errMissingRequiredParameter(fmt.Errorf("InputSerialization must be provided"))
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}
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if parsedS3Select.Output.IsEmpty() {
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return errMissingRequiredParameter(fmt.Errorf("OutputSerialization must be provided"))
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}
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statement, err := sql.ParseSelectStatement(parsedS3Select.Expression)
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if err != nil {
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return err
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}
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parsedS3Select.statement = &statement
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*s3Select = S3Select(parsedS3Select)
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return nil
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}
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func (s3Select *S3Select) outputRecord() sql.Record {
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switch s3Select.Output.format {
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case csvFormat:
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return csv.NewRecord()
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case jsonFormat:
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return json.NewRecord(sql.SelectFmtJSON)
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}
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panic(fmt.Errorf("unknown output format '%v'", s3Select.Output.format))
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}
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func (s3Select *S3Select) getProgress() (bytesScanned, bytesProcessed int64) {
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if s3Select.progressReader != nil {
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return s3Select.progressReader.Stats()
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}
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return -1, -1
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}
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// Open - opens S3 object by using callback for SQL selection query.
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// Currently CSV, JSON and Apache Parquet formats are supported.
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func (s3Select *S3Select) Open(getReader func(offset, length int64) (io.ReadCloser, error)) error {
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switch s3Select.Input.format {
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case csvFormat:
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rc, err := getReader(0, -1)
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if err != nil {
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return err
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}
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s3Select.progressReader, err = newProgressReader(rc, s3Select.Input.CompressionType)
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if err != nil {
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rc.Close()
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return err
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}
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s3Select.recordReader, err = csv.NewReader(s3Select.progressReader, &s3Select.Input.CSVArgs)
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if err != nil {
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rc.Close()
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return err
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}
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return nil
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case jsonFormat:
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rc, err := getReader(0, -1)
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if err != nil {
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return err
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}
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s3Select.progressReader, err = newProgressReader(rc, s3Select.Input.CompressionType)
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if err != nil {
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rc.Close()
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return err
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}
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s3Select.recordReader = json.NewReader(s3Select.progressReader, &s3Select.Input.JSONArgs)
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return nil
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case parquetFormat:
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var err error
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s3Select.recordReader, err = parquet.NewReader(getReader, &s3Select.Input.ParquetArgs)
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return err
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}
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panic(fmt.Errorf("unknown input format '%v'", s3Select.Input.format))
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}
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func (s3Select *S3Select) marshal(record sql.Record) ([]byte, error) {
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switch s3Select.Output.format {
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case csvFormat:
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data, err := record.MarshalCSV([]rune(s3Select.Output.CSVArgs.FieldDelimiter)[0])
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if err != nil {
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return nil, err
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}
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return append(data, []byte(s3Select.Output.CSVArgs.RecordDelimiter)...), nil
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case jsonFormat:
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data, err := record.MarshalJSON()
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if err != nil {
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return nil, err
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}
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return append(data, []byte(s3Select.Output.JSONArgs.RecordDelimiter)...), nil
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}
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panic(fmt.Errorf("unknown output format '%v'", s3Select.Output.format))
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}
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// Evaluate - filters and sends records read from opened reader as per select statement to http response writer.
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func (s3Select *S3Select) Evaluate(w http.ResponseWriter) {
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getProgressFunc := s3Select.getProgress
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if !s3Select.Progress.Enabled {
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getProgressFunc = nil
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}
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writer := newMessageWriter(w, getProgressFunc)
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var inputRecord sql.Record
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var outputRecord sql.Record
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var err error
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var data []byte
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sendRecord := func() bool {
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if outputRecord == nil {
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return true
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}
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if data, err = s3Select.marshal(outputRecord); err != nil {
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return false
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}
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if len(data) > maxRecordSize {
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writer.FinishWithError("OverMaxRecordSize", "The length of a record in the input or result is greater than maxCharsPerRecord of 1 MB.")
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return false
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}
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if err = writer.SendRecord(data); err != nil {
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// FIXME: log this error.
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err = nil
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return false
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}
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return true
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}
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for {
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if s3Select.statement.LimitReached() {
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if err = writer.Finish(s3Select.getProgress()); err != nil {
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// FIXME: log this error.
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err = nil
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}
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break
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}
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if inputRecord, err = s3Select.recordReader.Read(); err != nil {
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if err != io.EOF {
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break
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}
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if s3Select.statement.IsAggregated() {
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outputRecord = s3Select.outputRecord()
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if err = s3Select.statement.AggregateResult(outputRecord); err != nil {
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break
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}
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if !sendRecord() {
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break
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}
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}
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if err = writer.Finish(s3Select.getProgress()); err != nil {
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// FIXME: log this error.
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err = nil
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}
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break
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}
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if inputRecord, err = s3Select.statement.EvalFrom(s3Select.Input.format, inputRecord); err != nil {
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break
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}
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if s3Select.statement.IsAggregated() {
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if err = s3Select.statement.AggregateRow(inputRecord); err != nil {
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break
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}
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} else {
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outputRecord = s3Select.outputRecord()
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if outputRecord, err = s3Select.statement.Eval(inputRecord, outputRecord); err != nil {
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break
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}
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if !sendRecord() {
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break
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}
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}
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}
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if err != nil {
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_ = writer.FinishWithError("InternalError", err.Error())
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}
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}
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// Close - closes opened S3 object.
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func (s3Select *S3Select) Close() error {
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return s3Select.recordReader.Close()
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}
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// NewS3Select - creates new S3Select by given request XML reader.
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func NewS3Select(r io.Reader) (*S3Select, error) {
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s3Select := &S3Select{}
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if err := xml.NewDecoder(r).Decode(s3Select); err != nil {
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return nil, err
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}
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return s3Select, nil
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}
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