minio/pkg/s3select/genmessage.go

183 lines
4.2 KiB
Go

// +build ignore
/*
* 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 (
"bytes"
"encoding/binary"
"fmt"
"hash/crc32"
)
func genRecordsHeader() {
buf := new(bytes.Buffer)
buf.WriteByte(13)
buf.WriteString(":message-type")
buf.WriteByte(7)
buf.Write([]byte{0, 5})
buf.WriteString("event")
buf.WriteByte(13)
buf.WriteString(":content-type")
buf.WriteByte(7)
buf.Write([]byte{0, 24})
buf.WriteString("application/octet-stream")
buf.WriteByte(11)
buf.WriteString(":event-type")
buf.WriteByte(7)
buf.Write([]byte{0, 7})
buf.WriteString("Records")
fmt.Println(buf.Bytes())
}
// Continuation Message
// ====================
// Header specification
// --------------------
// Continuation messages contain two headers, as follows:
// https://docs.aws.amazon.com/AmazonS3/latest/API/images/s3select-frame-diagram-cont.png
//
// Payload specification
// ---------------------
// Continuation messages have no payload.
func genContinuationMessage() {
buf := new(bytes.Buffer)
buf.WriteByte(13)
buf.WriteString(":message-type")
buf.WriteByte(7)
buf.Write([]byte{0, 5})
buf.WriteString("event")
buf.WriteByte(11)
buf.WriteString(":event-type")
buf.WriteByte(7)
buf.Write([]byte{0, 4})
buf.WriteString("Cont")
header := buf.Bytes()
headerLength := len(header)
payloadLength := 0
totalLength := totalByteLength(headerLength, payloadLength)
buf = new(bytes.Buffer)
binary.Write(buf, binary.BigEndian, uint32(totalLength))
binary.Write(buf, binary.BigEndian, uint32(headerLength))
prelude := buf.Bytes()
binary.Write(buf, binary.BigEndian, crc32.ChecksumIEEE(prelude))
buf.Write(header)
message := buf.Bytes()
binary.Write(buf, binary.BigEndian, crc32.ChecksumIEEE(message))
fmt.Println(buf.Bytes())
}
func genProgressHeader() {
buf := new(bytes.Buffer)
buf.WriteByte(13)
buf.WriteString(":message-type")
buf.WriteByte(7)
buf.Write([]byte{0, 5})
buf.WriteString("event")
buf.WriteByte(13)
buf.WriteString(":content-type")
buf.WriteByte(7)
buf.Write([]byte{0, 8})
buf.WriteString("text/xml")
buf.WriteByte(11)
buf.WriteString(":event-type")
buf.WriteByte(7)
buf.Write([]byte{0, 8})
buf.WriteString("Progress")
fmt.Println(buf.Bytes())
}
func genStatsHeader() {
buf := new(bytes.Buffer)
buf.WriteByte(13)
buf.WriteString(":message-type")
buf.WriteByte(7)
buf.Write([]byte{0, 5})
buf.WriteString("event")
buf.WriteByte(13)
buf.WriteString(":content-type")
buf.WriteByte(7)
buf.Write([]byte{0, 8})
buf.WriteString("text/xml")
buf.WriteByte(11)
buf.WriteString(":event-type")
buf.WriteByte(7)
buf.Write([]byte{0, 5})
buf.WriteString("Stats")
fmt.Println(buf.Bytes())
}
// End Message
// ===========
// Header specification
// --------------------
// End messages contain two headers, as follows:
// https://docs.aws.amazon.com/AmazonS3/latest/API/images/s3select-frame-diagram-end.png
//
// Payload specification
// ---------------------
// End messages have no payload.
func genEndMessage() {
buf := new(bytes.Buffer)
buf.WriteByte(13)
buf.WriteString(":message-type")
buf.WriteByte(7)
buf.Write([]byte{0, 5})
buf.WriteString("event")
buf.WriteByte(11)
buf.WriteString(":event-type")
buf.WriteByte(7)
buf.Write([]byte{0, 3})
buf.WriteString("End")
header := buf.Bytes()
headerLength := len(header)
payloadLength := 0
totalLength := totalByteLength(headerLength, payloadLength)
buf = new(bytes.Buffer)
binary.Write(buf, binary.BigEndian, uint32(totalLength))
binary.Write(buf, binary.BigEndian, uint32(headerLength))
prelude := buf.Bytes()
binary.Write(buf, binary.BigEndian, crc32.ChecksumIEEE(prelude))
buf.Write(header)
message := buf.Bytes()
binary.Write(buf, binary.BigEndian, crc32.ChecksumIEEE(message))
fmt.Println(buf.Bytes())
}