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434 lines
15 KiB
Go
434 lines
15 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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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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"net/http"
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"strconv"
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"sync/atomic"
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"time"
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)
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// A message is in the format specified in
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// https://docs.aws.amazon.com/AmazonS3/latest/API/images/s3select-frame-diagram-frame-overview.png
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// hence the calculation is made accordingly.
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func totalByteLength(headerLength, payloadLength int) int {
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return 4 + 4 + 4 + headerLength + payloadLength + 4
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}
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func genMessage(header, payload []byte) []byte {
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headerLength := len(header)
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payloadLength := len(payload)
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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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if payload != nil {
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buf.Write(payload)
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}
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message := buf.Bytes()
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binary.Write(buf, binary.BigEndian, crc32.ChecksumIEEE(message))
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return buf.Bytes()
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}
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// Refer genRecordsHeader().
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var recordsHeader = []byte{
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13, ':', 'm', 'e', 's', 's', 'a', 'g', 'e', '-', 't', 'y', 'p', 'e', 7, 0, 5, 'e', 'v', 'e', 'n', 't',
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13, ':', 'c', 'o', 'n', 't', 'e', 'n', 't', '-', 't', 'y', 'p', 'e', 7, 0, 24, 'a', 'p', 'p', 'l', 'i', 'c', 'a', 't', 'i', 'o', 'n', '/', 'o', 'c', 't', 'e', 't', '-', 's', 't', 'r', 'e', 'a', 'm',
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11, ':', 'e', 'v', 'e', 'n', 't', '-', 't', 'y', 'p', 'e', 7, 0, 7, 'R', 'e', 'c', 'o', 'r', 'd', 's',
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}
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const (
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// Chosen for compatibility with AWS JAVA SDK
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// It has a a buffer size of 128K:
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// https://github.com/aws/aws-sdk-java/blob/master/aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/internal/eventstreaming/MessageDecoder.java#L26
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// but we must make sure there is always space to add 256 bytes:
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// https://github.com/aws/aws-sdk-java/blob/master/aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/model/SelectObjectContentEventStream.java#L197
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maxRecordMessageLength = (128 << 10) - 256
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)
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var (
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bufLength = payloadLenForMsgLen(maxRecordMessageLength)
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)
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// newRecordsMessage - creates new Records Message which can contain a single record, partial records,
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// or multiple records. Depending on the size of the result, a response can contain one or more of these messages.
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//
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// Header specification
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// Records messages contain three headers, as follows:
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// https://docs.aws.amazon.com/AmazonS3/latest/API/images/s3select-frame-diagram-record.png
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//
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// Payload specification
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// Records message payloads can contain a single record, partial records, or multiple records.
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func newRecordsMessage(payload []byte) []byte {
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return genMessage(recordsHeader, payload)
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}
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// payloadLenForMsgLen computes the length of the payload in a record
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// message given the total length of the message.
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func payloadLenForMsgLen(messageLength int) int {
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headerLength := len(recordsHeader)
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payloadLength := messageLength - 4 - 4 - 4 - headerLength - 4
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return payloadLength
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}
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// continuationMessage - S3 periodically sends this message to keep the TCP connection open.
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// These messages appear in responses at random. The client must detect the message type and process accordingly.
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//
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// Header specification:
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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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// Continuation messages have no payload.
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var continuationMessage = []byte{
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0, 0, 0, 57, // total byte-length.
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0, 0, 0, 41, // headers byte-length.
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139, 161, 157, 242, // prelude crc.
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13, ':', 'm', 'e', 's', 's', 'a', 'g', 'e', '-', 't', 'y', 'p', 'e', 7, 0, 5, 'e', 'v', 'e', 'n', 't', // headers.
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11, ':', 'e', 'v', 'e', 'n', 't', '-', 't', 'y', 'p', 'e', 7, 0, 4, 'C', 'o', 'n', 't', // headers.
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156, 134, 74, 13, // message crc.
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}
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// Refer genProgressHeader().
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var progressHeader = []byte{
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13, ':', 'm', 'e', 's', 's', 'a', 'g', 'e', '-', 't', 'y', 'p', 'e', 7, 0, 5, 'e', 'v', 'e', 'n', 't',
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13, ':', 'c', 'o', 'n', 't', 'e', 'n', 't', '-', 't', 'y', 'p', 'e', 7, 0, 8, 't', 'e', 'x', 't', '/', 'x', 'm', 'l',
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11, ':', 'e', 'v', 'e', 'n', 't', '-', 't', 'y', 'p', 'e', 7, 0, 8, 'P', 'r', 'o', 'g', 'r', 'e', 's', 's',
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}
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// newProgressMessage - creates new Progress Message. S3 periodically sends this message, if requested.
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// It contains information about the progress of a query that has started but has not yet completed.
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//
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// Header specification:
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// Progress messages contain three headers, as follows:
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// https://docs.aws.amazon.com/AmazonS3/latest/API/images/s3select-frame-diagram-progress.png
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//
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// Payload specification:
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// Progress message payload is an XML document containing information about the progress of a request.
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// * BytesScanned => Number of bytes that have been processed before being uncompressed (if the file is compressed).
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// * BytesProcessed => Number of bytes that have been processed after being uncompressed (if the file is compressed).
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// * BytesReturned => Current number of bytes of records payload data returned by S3.
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//
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// For uncompressed files, BytesScanned and BytesProcessed are equal.
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//
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// Example:
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//
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// <?xml version="1.0" encoding="UTF-8"?>
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// <Progress>
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// <BytesScanned>512</BytesScanned>
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// <BytesProcessed>1024</BytesProcessed>
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// <BytesReturned>1024</BytesReturned>
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// </Progress>
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//
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func newProgressMessage(bytesScanned, bytesProcessed, bytesReturned int64) []byte {
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payload := []byte(`<?xml version="1.0" encoding="UTF-8"?><Progress><BytesScanned>` +
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strconv.FormatInt(bytesScanned, 10) + `</BytesScanned><BytesProcessed>` +
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strconv.FormatInt(bytesProcessed, 10) + `</BytesProcessed><BytesReturned>` +
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strconv.FormatInt(bytesReturned, 10) + `</BytesReturned></Stats>`)
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return genMessage(progressHeader, payload)
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}
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// Refer genStatsHeader().
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var statsHeader = []byte{
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13, ':', 'm', 'e', 's', 's', 'a', 'g', 'e', '-', 't', 'y', 'p', 'e', 7, 0, 5, 'e', 'v', 'e', 'n', 't',
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13, ':', 'c', 'o', 'n', 't', 'e', 'n', 't', '-', 't', 'y', 'p', 'e', 7, 0, 8, 't', 'e', 'x', 't', '/', 'x', 'm', 'l',
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11, ':', 'e', 'v', 'e', 'n', 't', '-', 't', 'y', 'p', 'e', 7, 0, 5, 'S', 't', 'a', 't', 's',
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}
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// newStatsMessage - creates new Stats Message. S3 sends this message at the end of the request.
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// It contains statistics about the query.
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//
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// Header specification:
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// Stats messages contain three headers, as follows:
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// https://docs.aws.amazon.com/AmazonS3/latest/API/images/s3select-frame-diagram-stats.png
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//
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// Payload specification:
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// Stats message payload is an XML document containing information about a request's stats when processing is complete.
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// * BytesScanned => Number of bytes that have been processed before being uncompressed (if the file is compressed).
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// * BytesProcessed => Number of bytes that have been processed after being uncompressed (if the file is compressed).
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// * BytesReturned => Total number of bytes of records payload data returned by S3.
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//
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// For uncompressed files, BytesScanned and BytesProcessed are equal.
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//
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// Example:
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//
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// <?xml version="1.0" encoding="UTF-8"?>
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// <Stats>
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// <BytesScanned>512</BytesScanned>
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// <BytesProcessed>1024</BytesProcessed>
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// <BytesReturned>1024</BytesReturned>
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// </Stats>
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func newStatsMessage(bytesScanned, bytesProcessed, bytesReturned int64) []byte {
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payload := []byte(`<?xml version="1.0" encoding="UTF-8"?><Stats><BytesScanned>` +
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strconv.FormatInt(bytesScanned, 10) + `</BytesScanned><BytesProcessed>` +
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strconv.FormatInt(bytesProcessed, 10) + `</BytesProcessed><BytesReturned>` +
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strconv.FormatInt(bytesReturned, 10) + `</BytesReturned></Stats>`)
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return genMessage(statsHeader, payload)
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}
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// endMessage - indicates that the request is complete, and no more messages will be sent.
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// You should not assume that the request is complete until the client receives an End message.
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//
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// Header specification:
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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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// End messages have no payload.
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var endMessage = []byte{
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0, 0, 0, 56, // total byte-length.
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0, 0, 0, 40, // headers byte-length.
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193, 198, 132, 212, // prelude crc.
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13, ':', 'm', 'e', 's', 's', 'a', 'g', 'e', '-', 't', 'y', 'p', 'e', 7, 0, 5, 'e', 'v', 'e', 'n', 't', // headers.
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11, ':', 'e', 'v', 'e', 'n', 't', '-', 't', 'y', 'p', 'e', 7, 0, 3, 'E', 'n', 'd', // headers.
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207, 151, 211, 146, // message crc.
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}
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// newErrorMessage - creates new Request Level Error Message. S3 sends this message if the request failed for any reason.
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// It contains the error code and error message for the failure. If S3 sends a RequestLevelError message,
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// it doesn't send an End message.
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//
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// Header specification:
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// Request-level error messages contain three headers, as follows:
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// https://docs.aws.amazon.com/AmazonS3/latest/API/images/s3select-frame-diagram-error.png
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//
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// Payload specification:
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// Request-level error messages have no payload.
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func newErrorMessage(errorCode, errorMessage []byte) []byte {
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buf := new(bytes.Buffer)
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buf.Write([]byte{13, ':', 'm', 'e', 's', 's', 'a', 'g', 'e', '-', 't', 'y', 'p', 'e', 7, 0, 5, 'e', 'r', 'r', 'o', 'r'})
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buf.Write([]byte{14, ':', 'e', 'r', 'r', 'o', 'r', '-', 'm', 'e', 's', 's', 'a', 'g', 'e', 7})
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binary.Write(buf, binary.BigEndian, uint16(len(errorMessage)))
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buf.Write(errorMessage)
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buf.Write([]byte{11, ':', 'e', 'r', 'r', 'o', 'r', '-', 'c', 'o', 'd', 'e', 7})
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binary.Write(buf, binary.BigEndian, uint16(len(errorCode)))
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buf.Write(errorCode)
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return genMessage(buf.Bytes(), nil)
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}
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// NewErrorMessage - creates new Request Level Error Message specified in
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// https://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectSELECTContent.html.
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func NewErrorMessage(errorCode, errorMessage string) []byte {
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return newErrorMessage([]byte(errorCode), []byte(errorMessage))
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}
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type messageWriter struct {
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writer http.ResponseWriter
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getProgressFunc func() (int64, int64)
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bytesReturned int64
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payloadBuffer []byte
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payloadBufferIndex int
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payloadCh chan *bytes.Buffer
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finBytesScanned, finBytesProcessed int64
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errCh chan []byte
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doneCh chan struct{}
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}
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func (writer *messageWriter) write(data []byte) bool {
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if _, err := writer.writer.Write(data); err != nil {
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return false
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}
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writer.writer.(http.Flusher).Flush()
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return true
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}
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func (writer *messageWriter) start() {
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keepAliveTicker := time.NewTicker(1 * time.Second)
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var progressTicker *time.Ticker
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var progressTickerC <-chan time.Time
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if writer.getProgressFunc != nil {
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progressTicker = time.NewTicker(1 * time.Minute)
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progressTickerC = progressTicker.C
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}
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recordStagingTicker := time.NewTicker(500 * time.Millisecond)
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// Exit conditions:
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//
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// 1. If a writer.write() returns false, select loop below exits and
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// closes `doneCh` to indicate to caller to also exit.
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//
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// 2. If caller (Evaluate()) has an error, it sends an error
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// message and waits for this go-routine to quit in
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// FinishWithError()
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//
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// 3. If caller is done, it waits for this go-routine to exit
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// in Finish()
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quitFlag := false
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for !quitFlag {
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select {
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case data := <-writer.errCh:
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quitFlag = true
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// Flush collected records before sending error message
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if !writer.flushRecords() {
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break
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}
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writer.write(data)
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case payload, ok := <-writer.payloadCh:
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if !ok {
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// payloadCh is closed by caller to
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// indicate finish with success
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quitFlag = true
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if !writer.flushRecords() {
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break
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}
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// Write Stats message, then End message
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bytesReturned := atomic.LoadInt64(&writer.bytesReturned)
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if !writer.write(newStatsMessage(writer.finBytesScanned, writer.finBytesProcessed, bytesReturned)) {
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break
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}
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writer.write(endMessage)
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} else {
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for payload.Len() > 0 {
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copiedLen := copy(writer.payloadBuffer[writer.payloadBufferIndex:], payload.Bytes())
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writer.payloadBufferIndex += copiedLen
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payload.Next(copiedLen)
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// If buffer is filled, flush it now!
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freeSpace := bufLength - writer.payloadBufferIndex
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if freeSpace == 0 {
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if !writer.flushRecords() {
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quitFlag = true
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break
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}
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}
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}
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bufPool.Put(payload)
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}
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case <-recordStagingTicker.C:
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if !writer.flushRecords() {
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quitFlag = true
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}
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case <-keepAliveTicker.C:
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if !writer.write(continuationMessage) {
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quitFlag = true
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}
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case <-progressTickerC:
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bytesScanned, bytesProcessed := writer.getProgressFunc()
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bytesReturned := atomic.LoadInt64(&writer.bytesReturned)
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if !writer.write(newProgressMessage(bytesScanned, bytesProcessed, bytesReturned)) {
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quitFlag = true
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}
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}
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}
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close(writer.doneCh)
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recordStagingTicker.Stop()
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keepAliveTicker.Stop()
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if progressTicker != nil {
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progressTicker.Stop()
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}
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// Whatever drain the payloadCh to prevent from memory leaking.
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for len(writer.payloadCh) > 0 {
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payload := <-writer.payloadCh
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bufPool.Put(payload)
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}
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}
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// Sends a single whole record.
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func (writer *messageWriter) SendRecord(payload *bytes.Buffer) error {
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select {
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case writer.payloadCh <- payload:
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return nil
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case <-writer.doneCh:
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return fmt.Errorf("messageWriter is done")
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}
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}
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func (writer *messageWriter) flushRecords() bool {
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if writer.payloadBufferIndex == 0 {
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return true
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}
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result := writer.write(newRecordsMessage(writer.payloadBuffer[0:writer.payloadBufferIndex]))
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if result {
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atomic.AddInt64(&writer.bytesReturned, int64(writer.payloadBufferIndex))
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writer.payloadBufferIndex = 0
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}
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return result
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}
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// Finish is the last call to the message writer - it sends any
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// remaining record payload, then sends statistics and finally the end
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// message.
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func (writer *messageWriter) Finish(bytesScanned, bytesProcessed int64) error {
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select {
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case <-writer.doneCh:
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return fmt.Errorf("messageWriter is done")
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default:
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writer.finBytesScanned = bytesScanned
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writer.finBytesProcessed = bytesProcessed
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close(writer.payloadCh)
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// Wait until the `start` go-routine is done.
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<-writer.doneCh
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return nil
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}
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}
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func (writer *messageWriter) FinishWithError(errorCode, errorMessage string) error {
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select {
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case <-writer.doneCh:
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return fmt.Errorf("messageWriter is done")
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case writer.errCh <- newErrorMessage([]byte(errorCode), []byte(errorMessage)):
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// Wait until the `start` go-routine is done.
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<-writer.doneCh
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return nil
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}
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}
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// newMessageWriter creates a message writer that writes to the HTTP
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// response writer
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func newMessageWriter(w http.ResponseWriter, getProgressFunc func() (bytesScanned, bytesProcessed int64)) *messageWriter {
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writer := &messageWriter{
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writer: w,
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getProgressFunc: getProgressFunc,
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payloadBuffer: make([]byte, bufLength),
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payloadCh: make(chan *bytes.Buffer, 1),
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errCh: make(chan []byte),
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doneCh: make(chan struct{}),
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}
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go writer.start()
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return writer
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}
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