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load_triggers.go
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load_triggers.go
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// Copyright 2020-2021 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package analyzer
import (
"strings"
"github.com/Rock-liyi/p2pdb-store/sql"
"github.com/Rock-liyi/p2pdb-store/sql/parse"
"github.com/Rock-liyi/p2pdb-store/sql/plan"
)
// loadTriggers loads any triggers that are required for a plan node to operate properly (except for nodes dealing with
// trigger execution).
func loadTriggers(ctx *sql.Context, a *Analyzer, n sql.Node, scope *Scope) (sql.Node, error) {
span, _ := ctx.Span("loadTriggers")
defer span.Finish()
return plan.TransformUp(n, func(n sql.Node) (sql.Node, error) {
switch node := n.(type) {
case *plan.ShowTriggers:
newShowTriggers := *node
loadedTriggers, err := loadTriggersFromDb(ctx, newShowTriggers.Database())
if err != nil {
return nil, err
}
if len(loadedTriggers) != 0 {
newShowTriggers.Triggers = loadedTriggers
} else {
newShowTriggers.Triggers = make([]*plan.CreateTrigger, 0)
}
return &newShowTriggers, nil
case *plan.DropTrigger:
loadedTriggers, err := loadTriggersFromDb(ctx, node.Database())
if err != nil {
return nil, err
}
lowercasedTriggerName := strings.ToLower(node.TriggerName)
for _, trigger := range loadedTriggers {
if strings.ToLower(trigger.TriggerName) == lowercasedTriggerName {
node.TriggerName = trigger.TriggerName
} else if trigger.TriggerOrder != nil &&
strings.ToLower(trigger.TriggerOrder.OtherTriggerName) == lowercasedTriggerName {
return nil, sql.ErrTriggerCannotBeDropped.New(node.TriggerName, trigger.TriggerName)
}
}
return node, nil
case *plan.DropTable:
loadedTriggers, err := loadTriggersFromDb(ctx, node.Database())
if err != nil {
return nil, err
}
lowercasedNames := make(map[string]struct{})
for _, tableName := range node.TableNames() {
lowercasedNames[strings.ToLower(tableName)] = struct{}{}
}
var triggersForTable []string
for _, trigger := range loadedTriggers {
if _, ok := lowercasedNames[strings.ToLower(trigger.Table.(*plan.UnresolvedTable).Name())]; ok {
triggersForTable = append(triggersForTable, trigger.TriggerName)
}
}
return node.WithTriggers(triggersForTable), nil
default:
return node, nil
}
})
}
func loadTriggersFromDb(ctx *sql.Context, db sql.Database) ([]*plan.CreateTrigger, error) {
var loadedTriggers []*plan.CreateTrigger
if triggerDb, ok := db.(sql.TriggerDatabase); ok {
triggers, err := triggerDb.GetTriggers(ctx)
if err != nil {
return nil, err
}
for _, trigger := range triggers {
parsedTrigger, err := parse.Parse(ctx, trigger.CreateStatement)
if err != nil {
return nil, err
}
triggerPlan, ok := parsedTrigger.(*plan.CreateTrigger)
if !ok {
return nil, sql.ErrTriggerCreateStatementInvalid.New(trigger.CreateStatement)
}
loadedTriggers = append(loadedTriggers, triggerPlan)
}
}
return loadedTriggers, nil
}