wehub-resource-sync
119 lines
3.9 KiB
Go
119 lines
3.9 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 triggers
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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 Trigger as a byte slice. If the Trigger is invalid, then this returns a nil slice.
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func (trigger Trigger) Serialize(ctx context.Context) ([]byte, error) {
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if !trigger.ID.IsValid() {
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return nil, nil
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}
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// Initialize the writer and version
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writer := utils.NewWriter(256)
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writer.VariableUint(0) // Version
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// Write the trigger data
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writer.Id(trigger.ID.AsId())
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writer.Id(trigger.Function.AsId())
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writer.Uint8(uint8(trigger.Timing))
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writer.Bool(trigger.ForEachRow)
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writer.Uint8(uint8(trigger.Deferrable))
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writer.Id(trigger.ReferencedTableName.AsId())
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writer.Bool(trigger.Constraint)
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writer.String(trigger.OldTransitionName)
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writer.String(trigger.NewTransitionName)
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writer.StringSlice(trigger.Arguments)
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writer.String(trigger.Definition)
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// Write the WHEN operations
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writer.VariableUint(uint64(len(trigger.When)))
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for _, op := range trigger.When {
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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 the events
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writer.VariableUint(uint64(len(trigger.Events)))
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for _, event := range trigger.Events {
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writer.Uint8(uint8(event.Type))
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writer.StringSlice(event.ColumnNames)
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}
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// Returns the data
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return writer.Data(), nil
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}
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// DeserializeTrigger returns the Trigger that was serialized in the byte slice. Returns an empty Trigger (invalid ID)
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// if data is nil or empty.
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func DeserializeTrigger(ctx context.Context, data []byte) (Trigger, error) {
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if len(data) == 0 {
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return Trigger{}, 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 != 0 {
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return Trigger{}, errors.Errorf("version %d of triggers is not supported, please upgrade the server", version)
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}
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// Read from the reader
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t := Trigger{}
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t.ID = id.Trigger(reader.Id())
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t.Function = id.Function(reader.Id())
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t.Timing = TriggerTiming(reader.Uint8())
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t.ForEachRow = reader.Bool()
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t.Deferrable = TriggerDeferrable(reader.Uint8())
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t.ReferencedTableName = id.Table(reader.Id())
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t.Constraint = reader.Bool()
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t.OldTransitionName = reader.String()
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t.NewTransitionName = reader.String()
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t.Arguments = reader.StringSlice()
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t.Definition = reader.String()
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// Read the WHEN operations
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opCount := reader.VariableUint()
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t.When = 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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t.When[opIdx] = op
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}
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// Read the events
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eventCount := reader.VariableUint()
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t.Events = make([]TriggerEvent, eventCount)
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for eventIdx := uint64(0); eventIdx < eventCount; eventIdx++ {
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t.Events[eventIdx].Type = TriggerEventType(reader.Uint8())
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t.Events[eventIdx].ColumnNames = reader.StringSlice()
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}
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if !reader.IsEmpty() {
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return Trigger{}, errors.Errorf("extra data found while deserializing a trigger")
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}
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// Return the deserialized object
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return t, nil
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}
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