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