wehub-resource-sync
119 lines
3.7 KiB
Go
119 lines
3.7 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 functions
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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/server/plpgsql"
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"github.com/dolthub/doltgresql/utils"
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)
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// Serialize returns the Function as a byte slice. If the Function is invalid, then this returns a nil slice.
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func (function Function) Serialize(ctx context.Context) ([]byte, error) {
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if !function.ID.IsValid() {
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return nil, nil
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}
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// Write all of the functions to the writer
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writer := utils.NewWriter(256)
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writer.VariableUint(3) // Version
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// Write the function data
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writer.Id(function.ID.AsId())
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writer.Id(function.ReturnType.AsId())
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writer.StringSlice(function.ParameterNames)
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writer.IdTypeSlice(function.ParameterTypes)
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writer.Bool(function.Variadic)
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writer.Bool(function.IsNonDeterministic)
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writer.Bool(function.Strict)
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writer.String(function.Definition)
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// Write the operations
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writer.VariableUint(uint64(len(function.Operations)))
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for _, op := range function.Operations {
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writer.Uint16(uint16(op.OpCode))
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writer.String(op.PrimaryData)
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writer.StringSlice(op.SecondaryData)
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writer.String(op.Target)
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writer.Int32(int32(op.Index))
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writer.StringMap(op.Options)
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}
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// Write version 1 data
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writer.String(function.ExtensionName)
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writer.String(function.ExtensionSymbol)
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// Write version 2 data
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writer.String(function.SQLDefinition)
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writer.Bool(function.SetOf)
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// Write version 3 data
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writer.StringSlice(function.ParameterDefaults)
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// Returns the data
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return writer.Data(), nil
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}
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// DeserializeFunction returns the Function that was serialized in the byte slice. Returns an empty Function (invalid
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// ID) if data is nil or empty.
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func DeserializeFunction(ctx context.Context, data []byte) (Function, error) {
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if len(data) == 0 {
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return Function{}, 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 > 3 {
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return Function{}, errors.Errorf("version %d of functions is not supported, please upgrade the server", version)
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}
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// Read from the reader
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f := Function{}
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f.ID = id.Function(reader.Id())
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f.ReturnType = id.Type(reader.Id())
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f.ParameterNames = reader.StringSlice()
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f.ParameterTypes = reader.IdTypeSlice()
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f.Variadic = reader.Bool()
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f.IsNonDeterministic = reader.Bool()
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f.Strict = reader.Bool()
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f.Definition = reader.String()
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// Read the operations
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opCount := reader.VariableUint()
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f.Operations = make([]plpgsql.InterpreterOperation, opCount)
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for opIdx := uint64(0); opIdx < opCount; opIdx++ {
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op := plpgsql.InterpreterOperation{}
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op.OpCode = plpgsql.OpCode(reader.Uint16())
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op.PrimaryData = reader.String()
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op.SecondaryData = reader.StringSlice()
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op.Target = reader.String()
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op.Index = int(reader.Int32())
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op.Options = reader.StringMap()
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f.Operations[opIdx] = op
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}
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if version >= 1 {
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f.ExtensionName = reader.String()
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f.ExtensionSymbol = reader.String()
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}
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if version >= 2 {
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f.SQLDefinition = reader.String()
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f.SetOf = reader.Bool()
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}
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if version >= 3 {
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f.ParameterDefaults = reader.StringSlice()
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}
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if !reader.IsEmpty() {
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return Function{}, errors.Errorf("extra data found while deserializing a function")
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}
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// Return the deserialized object
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return f, nil
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}
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