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txn.go
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txn.go
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// Copyright 2015 The Cockroach Authors.
//
// 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.
//
// Author: Vivek Menezes (vivek@cockroachlabs.com)
package sql
import (
"github.com/cockroachdb/cockroach/pkg/roachpb"
"github.com/cockroachdb/cockroach/pkg/sql/parser"
"github.com/cockroachdb/cockroach/pkg/storage/engine/enginepb"
"github.com/pkg/errors"
)
// BeginTransaction starts a new transaction.
func (p *planner) BeginTransaction(n *parser.BeginTransaction) (planNode, error) {
if p.txn == nil {
return nil, errors.Errorf("the server should have already created a transaction")
}
if err := p.setIsolationLevel(n.Isolation); err != nil {
return nil, err
}
if err := p.setUserPriority(n.UserPriority); err != nil {
return nil, err
}
return &emptyNode{}, nil
}
// SetTransaction sets a transaction's isolation level
func (p *planner) SetTransaction(n *parser.SetTransaction) (planNode, error) {
if err := p.setIsolationLevel(n.Isolation); err != nil {
return nil, err
}
if err := p.setUserPriority(n.UserPriority); err != nil {
return nil, err
}
return &emptyNode{}, nil
}
func (p *planner) setIsolationLevel(level parser.IsolationLevel) error {
switch level {
case parser.UnspecifiedIsolation:
return nil
case parser.SnapshotIsolation:
return p.txn.SetIsolation(enginepb.SNAPSHOT)
case parser.SerializableIsolation:
return p.txn.SetIsolation(enginepb.SERIALIZABLE)
default:
return errors.Errorf("unknown isolation level: %s", level)
}
}
func (p *planner) setUserPriority(userPriority parser.UserPriority) error {
switch userPriority {
case parser.UnspecifiedUserPriority:
return nil
case parser.Low:
return p.txn.SetUserPriority(roachpb.MinUserPriority)
case parser.Normal:
return p.txn.SetUserPriority(roachpb.NormalUserPriority)
case parser.High:
return p.txn.SetUserPriority(roachpb.MaxUserPriority)
default:
return errors.Errorf("unknown user priority: %s", userPriority)
}
}