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// Copyright 2021 PingCAP, 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, | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
|
||
package kv | ||
|
||
import ( | ||
"github.com/pingcap/tidb/config" | ||
"github.com/pingcap/tidb/store/tikv/oracle" | ||
) | ||
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// TxnScopeVar indicates the used txnScope for oracle | ||
type TxnScopeVar struct { | ||
// varValue indicates the value of @@txn_scope, which can only be `global` or `local` | ||
varValue string | ||
// txnScope indicates the value which the tidb-server holds to request tso to pd | ||
txnScope string | ||
} | ||
|
||
// GetTxnScopeVar gets TxnScopeVar from config | ||
func GetTxnScopeVar() TxnScopeVar { | ||
isGlobal, location := config.GetTxnScopeFromConfig() | ||
if isGlobal { | ||
return NewGlobalTxnScopeVar() | ||
} | ||
return NewLocalTxnScopeVar(location) | ||
} | ||
|
||
// NewGlobalTxnScopeVar creates a Global TxnScopeVar | ||
func NewGlobalTxnScopeVar() TxnScopeVar { | ||
return newTxnScopeVar(GlobalTxnScope, GlobalTxnScope) | ||
} | ||
|
||
// NewLocalTxnScopeVar creates a Local TxnScopeVar with given real txnScope value. | ||
func NewLocalTxnScopeVar(txnScope string) TxnScopeVar { | ||
return newTxnScopeVar(LocalTxnScope, txnScope) | ||
} | ||
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// GetVarValue returns the value of @@txn_scope which can only be `global` or `local` | ||
func (t TxnScopeVar) GetVarValue() string { | ||
return t.varValue | ||
} | ||
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// GetTxnScope returns the value of the tidb-server holds to request tso to pd. | ||
func (t TxnScopeVar) GetTxnScope() string { | ||
return t.txnScope | ||
} | ||
|
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func newTxnScopeVar(varValue string, txnScope string) TxnScopeVar { | ||
return TxnScopeVar{ | ||
varValue: varValue, | ||
txnScope: txnScope, | ||
} | ||
} | ||
|
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// Transaction scopes constants. | ||
const ( | ||
// GlobalTxnScope is synced with PD's define of global scope. | ||
// If we want to remove the dependency on store/tikv here, we need to map | ||
// the two GlobalTxnScopes in the driver layer. | ||
GlobalTxnScope = oracle.GlobalTxnScope | ||
// LocalTxnScope indicates the transaction should use local ts. | ||
LocalTxnScope = "local" | ||
) |
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