131 lines
4.3 KiB
Go
131 lines
4.3 KiB
Go
/*
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Copyright 2022 Alibaba Group Holding Limited.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 event
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import (
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"errors"
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"github.com/google/uuid"
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"github.com/alibaba/polardbx-operator/pkg/binlogtool/binlog/layout"
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"github.com/alibaba/polardbx-operator/pkg/binlogtool/binlog/spec"
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"github.com/alibaba/polardbx-operator/pkg/binlogtool/utils"
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)
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const (
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IMMEDIATE_COMMIT_TIMESTAMP_LENGTH = 7
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ORIGINAL_COMMIT_TIMESTAMP_LENGTH = 7
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ENCODED_COMMIT_TIMESTAMP_LENGTH = 55
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TRANSACTION_LENGTH_MIN_LENGTH = 1
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TRANSACTION_LENGTH_MAX_LENGTH = 9
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ORIGINAL_SERVER_VERSION_LENGTH = 4
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IMMEDIATE_SERVER_VERSION_LENGTH = 4
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ENCODED_SERVER_VERSION_LENGTH = 31
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)
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type GTIDLogEvent struct {
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GTIDFlags uint8 `json:"gtid_flags,omitempty"`
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SID uuid.UUID `json:"sid,omitempty"`
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GNo uint64 `json:"gno,omitempty"`
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LtType uint8 `json:"lt_type,omitempty"`
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LastCommitted uint64 `json:"last_committed,omitempty"`
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SequenceNumber uint64 `json:"sequence_number,omitempty"`
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ImmediateCommitTimestamp uint64 `json:"immediate_commit_timestamp,omitempty"`
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OriginalCommitTimestamp uint64 `json:"original_commit_timestamp,omitempty"`
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TransactionLength uint64 `json:"transaction_length,omitempty"`
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OriginalServerVersion uint32 `json:"original_server_version,omitempty"`
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ImmediateServerVersion uint32 `json:"immediate_server_version,omitempty"`
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}
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func (e *GTIDLogEvent) Layout(version uint32, code byte, fde *FormatDescriptionEvent) *layout.Layout {
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return layout.Decl(
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layout.Number(&e.GTIDFlags),
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layout.UUID(&e.SID),
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layout.Number(&e.GNo),
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layout.Number(&e.LtType),
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layout.Area(layout.Infinite(), func(bs []byte) (int, error) {
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off := 0
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if e.LtType == spec.LOGICAL_TIMESTAMP_TYPECODE {
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n, err := layout.Decl(
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layout.Number(&e.LastCommitted),
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layout.Number(&e.SequenceNumber),
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).FromBlock(bs[off:])
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if err != nil {
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return 0, err
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}
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off += n
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// libbinlogevents/src/control_events.cpp
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if len(bs) >= off+IMMEDIATE_COMMIT_TIMESTAMP_LENGTH {
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var buf [8]byte
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copy(buf[:IMMEDIATE_COMMIT_TIMESTAMP_LENGTH], bs[off:])
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utils.ReadNumberLittleEndianHack(&e.ImmediateCommitTimestamp, buf[:])
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off += IMMEDIATE_COMMIT_TIMESTAMP_LENGTH
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if (e.ImmediateCommitTimestamp & (uint64(1) << ENCODED_COMMIT_TIMESTAMP_LENGTH)) != 0 {
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// Clear MSB
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e.ImmediateCommitTimestamp &= ^(uint64(1) << ENCODED_COMMIT_TIMESTAMP_LENGTH)
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// Read the original commit timestamp.
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if len(bs) >= off+ORIGINAL_COMMIT_TIMESTAMP_LENGTH {
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var buf [8]byte
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copy(buf[:ORIGINAL_COMMIT_TIMESTAMP_LENGTH], bs[off:])
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utils.ReadNumberLittleEndianHack(&e.OriginalCommitTimestamp, buf[:])
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off += ORIGINAL_COMMIT_TIMESTAMP_LENGTH
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} else {
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return 0, errors.New("not enough bytes for original_commit_timestamp")
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}
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} else {
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e.OriginalCommitTimestamp = e.ImmediateCommitTimestamp
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}
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}
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if len(bs) >= off+TRANSACTION_LENGTH_MIN_LENGTH {
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n, err := layout.PackedInt(&e.TransactionLength).FromBlock(bs[off:])
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if err != nil {
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return 0, err
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}
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off += n
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}
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if len(bs) >= off+IMMEDIATE_SERVER_VERSION_LENGTH {
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n, err := layout.Number(&e.ImmediateServerVersion).FromBlock(bs[off:])
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if err != nil {
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return 0, err
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}
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off += n
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if (e.ImmediateServerVersion & (uint32(1) << ENCODED_SERVER_VERSION_LENGTH)) != 0 {
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e.ImmediateServerVersion &= ^(uint32(1) << ENCODED_SERVER_VERSION_LENGTH)
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n, err = layout.Number(&e.OriginalServerVersion).FromBlock(bs[off:])
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if err != nil {
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return 0, err
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}
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off += n
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} else {
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e.OriginalServerVersion = e.ImmediateServerVersion
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}
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}
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}
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return off, nil
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}),
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)
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}
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