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// Copyright 2015 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 (
"strings"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/terror"
)
// KV error codes.
const (
codeClosed terror.ErrCode = 1
codeNotExist = 2
codeConditionNotMatch = 3
codeLockConflict = 4
codeLazyConditionPairsNotMatch = 5
codeRetryable = 6
codeCantSetNilValue = 7
codeInvalidTxn = 8
codeNotCommitted = 9
codeNotImplemented = 10
codeTxnTooLarge = 11
codeEntryTooLarge = 12
codeKeyExists = 1062
)
var (
// ErrClosed is used when close an already closed txn.
ErrClosed = terror.ClassKV.New(codeClosed, "Error: Transaction already closed")
// ErrNotExist is used when try to get an entry with an unexist key from KV store.
ErrNotExist = terror.ClassKV.New(codeNotExist, "Error: key not exist")
// ErrConditionNotMatch is used when condition is not met.
ErrConditionNotMatch = terror.ClassKV.New(codeConditionNotMatch, "Error: Condition not match")
// ErrLockConflict is used when try to lock an already locked key.
ErrLockConflict = terror.ClassKV.New(codeLockConflict, "Error: Lock conflict")
// ErrLazyConditionPairsNotMatch is used when value in store differs from expect pairs.
ErrLazyConditionPairsNotMatch = terror.ClassKV.New(codeLazyConditionPairsNotMatch, "Error: Lazy condition pairs not match")
// ErrRetryable is used when KV store occurs RPC error or some other
// errors which SQL layer can safely retry.
ErrRetryable = terror.ClassKV.New(codeRetryable, "Error: KV error safe to retry")
// ErrCannotSetNilValue is the error when sets an empty value.
ErrCannotSetNilValue = terror.ClassKV.New(codeCantSetNilValue, "can not set nil value")
// ErrInvalidTxn is the error when commits or rollbacks in an invalid transaction.
ErrInvalidTxn = terror.ClassKV.New(codeInvalidTxn, "invalid transaction")
// ErrTxnTooLarge is the error when transaction is too large, lock time reached the maximum value.
ErrTxnTooLarge = terror.ClassKV.New(codeTxnTooLarge, "transaction is too large")
// ErrEntryTooLarge is the error when a key value entry is too large.
ErrEntryTooLarge = terror.ClassKV.New(codeEntryTooLarge, "entry is too large")
// ErrNotCommitted is the error returned by CommitVersion when this
// transaction is not committed.
ErrNotCommitted = terror.ClassKV.New(codeNotCommitted, "this transaction has not committed")
// ErrKeyExists returns when key is already exist.
ErrKeyExists = terror.ClassKV.New(codeKeyExists, "key already exist")
// ErrNotImplemented returns when a function is not implemented yet.
ErrNotImplemented = terror.ClassKV.New(codeNotImplemented, "not implemented")
)
func init() {
kvMySQLErrCodes := map[terror.ErrCode]uint16{
codeKeyExists: mysql.ErrDupEntry,
codeEntryTooLarge: mysql.ErrTooBigRowsize,
codeTxnTooLarge: mysql.ErrTxnTooLarge,
}
terror.ErrClassToMySQLCodes[terror.ClassKV] = kvMySQLErrCodes
}
// IsRetryableError checks if the err is a fatal error and the under going operation is worth to retry.
func IsRetryableError(err error) bool {
if err == nil {
return false
}
if ErrRetryable.Equal(err) ||
ErrLockConflict.Equal(err) ||
ErrConditionNotMatch.Equal(err) ||
// TiKV exception message will tell you if you should retry or not
strings.Contains(err.Error(), "try again later") {
return true
}
return false
}
// IsErrNotFound checks if err is a kind of NotFound error.
func IsErrNotFound(err error) bool {
if ErrNotExist.Equal(err) {
return true
}
return false
}
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