wehub-resource-sync
90 lines
2.8 KiB
Go
90 lines
2.8 KiB
Go
// Copyright 2024 Dolthub, 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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package sequences
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import (
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"context"
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"github.com/cockroachdb/errors"
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"github.com/dolthub/doltgresql/core/id"
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"github.com/dolthub/doltgresql/utils"
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)
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// Serialize returns the Sequence as a byte slice. If the Sequence is nil, then this returns a nil slice.
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func (sequence *Sequence) Serialize(ctx context.Context) ([]byte, error) {
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if sequence == nil {
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return nil, nil
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}
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// Create the writer
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writer := utils.NewWriter(256)
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writer.VariableUint(1) // Version
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// Write the sequence data
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writer.Id(sequence.Id.AsId())
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writer.Id(sequence.DataTypeID.AsId())
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writer.Uint8(uint8(sequence.Persistence))
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writer.Int64(sequence.Start)
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writer.Int64(sequence.Current)
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writer.Int64(sequence.Increment)
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writer.Int64(sequence.Minimum)
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writer.Int64(sequence.Maximum)
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writer.Int64(sequence.Cache)
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writer.Bool(sequence.Cycle)
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writer.Bool(sequence.IsAtEnd)
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writer.Bool(sequence.HasBeenCalled)
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writer.Id(sequence.OwnerTable.AsId())
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writer.String(sequence.OwnerColumn)
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// Returns the data
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return writer.Data(), nil
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}
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// DeserializeSequence returns the Sequence that was serialized in the byte slice. Returns an empty Sequence if data is
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// nil or empty.
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func DeserializeSequence(_ context.Context, data []byte) (*Sequence, error) {
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if len(data) == 0 {
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return nil, nil
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}
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reader := utils.NewReader(data)
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version := reader.VariableUint()
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if version > 1 {
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return nil, errors.Errorf("version %d of sequences is not supported, please upgrade the server", version)
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}
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// Read from the reader
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sequence := &Sequence{}
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sequence.Id = id.Sequence(reader.Id())
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sequence.DataTypeID = id.Type(reader.Id())
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sequence.Persistence = Persistence(reader.Uint8())
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sequence.Start = reader.Int64()
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sequence.Current = reader.Int64()
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sequence.Increment = reader.Int64()
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sequence.Minimum = reader.Int64()
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sequence.Maximum = reader.Int64()
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sequence.Cache = reader.Int64()
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sequence.Cycle = reader.Bool()
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sequence.IsAtEnd = reader.Bool()
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if version >= 1 {
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sequence.HasBeenCalled = reader.Bool()
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}
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sequence.OwnerTable = id.Table(reader.Id())
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sequence.OwnerColumn = reader.String()
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if !reader.IsEmpty() {
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return nil, errors.Errorf("extra data found while deserializing a sequence")
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}
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// Return the deserialized object
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return sequence, nil
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}
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