minio/internal/s3select/genmessage.go

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// +build ignore
// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
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())
}