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variables.go
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variables.go
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// Copyright 2020 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 dsess
import (
"strings"
"github.com/dolthub/go-mysql-server/sql"
)
const (
HeadKeySuffix = "_head"
HeadRefKeySuffix = "_head_ref"
WorkingKeySuffix = "_working"
StagedKeySuffix = "_staged"
DefaultBranchKeySuffix = "_default_branch"
)
const (
DoltCommitOnTransactionCommit = "dolt_transaction_commit"
TransactionsDisabledSysVar = "dolt_transactions_disabled"
ForceTransactionCommit = "dolt_force_transaction_commit"
CurrentBatchModeKey = "batch_mode"
AllowCommitConflicts = "dolt_allow_commit_conflicts"
)
func init() {
sql.SystemVariables.AddSystemVariables([]sql.SystemVariable{
{ // If true, causes a Dolt commit to occur when you commit a transaction.
Name: DoltCommitOnTransactionCommit,
Scope: sql.SystemVariableScope_Both,
Dynamic: true,
SetVarHintApplies: false,
Type: sql.NewSystemBoolType(DoltCommitOnTransactionCommit),
Default: int8(0),
},
{
Name: TransactionsDisabledSysVar,
Scope: sql.SystemVariableScope_Session,
Dynamic: true,
SetVarHintApplies: false,
Type: sql.NewSystemBoolType(TransactionsDisabledSysVar),
Default: int8(0),
},
{ // If true, disables the conflict and constraint violation check when you commit a transaction.
Name: ForceTransactionCommit,
Scope: sql.SystemVariableScope_Session,
Dynamic: true,
SetVarHintApplies: false,
Type: sql.NewSystemBoolType(ForceTransactionCommit),
Default: int8(0),
},
{
Name: CurrentBatchModeKey,
Scope: sql.SystemVariableScope_Session,
Dynamic: true,
SetVarHintApplies: false,
Type: sql.NewSystemIntType(CurrentBatchModeKey, -9223372036854775808, 9223372036854775807, false),
Default: int64(0),
},
{ // If true, disables the conflict violation check when you commit a transaction.
Name: AllowCommitConflicts,
Scope: sql.SystemVariableScope_Session,
Dynamic: true,
SetVarHintApplies: false,
Type: sql.NewSystemBoolType(AllowCommitConflicts),
Default: int8(0),
},
})
}
// defineSystemVariables defines dolt-session variables in the engine as necessary
func defineSystemVariables(name string) {
if _, _, ok := sql.SystemVariables.GetGlobal(name + HeadKeySuffix); !ok {
sql.SystemVariables.AddSystemVariables([]sql.SystemVariable{
{
Name: HeadRefKey(name),
Scope: sql.SystemVariableScope_Session,
Dynamic: true,
SetVarHintApplies: false,
Type: sql.NewSystemStringType(HeadRefKey(name)),
Default: "",
},
// The following variable are Dynamic, but read-only. Their values
// can only be updates by the system, not by users.
{
Name: HeadKey(name),
Scope: sql.SystemVariableScope_Session,
Dynamic: true,
SetVarHintApplies: false,
Type: sql.NewSystemStringType(HeadKey(name)),
Default: "",
},
{
Name: WorkingKey(name),
Scope: sql.SystemVariableScope_Session,
Dynamic: true,
SetVarHintApplies: false,
Type: sql.NewSystemStringType(WorkingKey(name)),
Default: "",
},
{
Name: StagedKey(name),
Scope: sql.SystemVariableScope_Session,
Dynamic: true,
SetVarHintApplies: false,
Type: sql.NewSystemStringType(StagedKey(name)),
Default: "",
},
{
Name: DefaultBranchKey(name),
Scope: sql.SystemVariableScope_Global,
Dynamic: true,
SetVarHintApplies: false,
Type: sql.NewSystemStringType(DefaultBranchKey(name)),
Default: "",
},
})
}
}
func HeadKey(dbName string) string {
return dbName + HeadKeySuffix
}
func HeadRefKey(dbName string) string {
return dbName + HeadRefKeySuffix
}
func WorkingKey(dbName string) string {
return dbName + WorkingKeySuffix
}
func StagedKey(dbName string) string {
return dbName + StagedKeySuffix
}
func DefaultBranchKey(dbName string) string {
return dbName + DefaultBranchKeySuffix
}
func IsHeadKey(key string) (bool, string) {
if strings.HasSuffix(key, HeadKeySuffix) {
return true, key[:len(key)-len(HeadKeySuffix)]
}
return false, ""
}
func IsHeadRefKey(key string) (bool, string) {
if strings.HasSuffix(key, HeadRefKeySuffix) {
return true, key[:len(key)-len(HeadRefKeySuffix)]
}
return false, ""
}
func IsWorkingKey(key string) (bool, string) {
if strings.HasSuffix(key, WorkingKeySuffix) {
return true, key[:len(key)-len(WorkingKeySuffix)]
}
return false, ""
}
func IsDefaultBranchKey(key string) (bool, string) {
if strings.HasSuffix(key, DefaultBranchKeySuffix) {
return true, key[:len(key)-len(DefaultBranchKeySuffix)]
}
return false, ""
}
func IsReadOnlyVersionKey(key string) bool {
return strings.HasSuffix(key, HeadKeySuffix) ||
strings.HasSuffix(key, StagedKeySuffix) ||
strings.HasSuffix(key, WorkingKeySuffix)
}