wehub-resource-sync
46 lines
1.6 KiB
Go
46 lines
1.6 KiB
Go
// Copyright 2023 Dolthub, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package utils
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import (
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"fmt"
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"strconv"
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"strings"
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"sync/atomic"
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)
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// uniqueAliasCounter is used to create unique aliases. Aliases are required by GMS when some expressions are contained
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// within an AliasedTableExpr. Postgres does not have this restriction, so we must do this for compatibility.
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var uniqueAliasCounter atomic.Uint64
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// uniqueAliasPrefix is the prefix given to aliases that have been generated by GenerateUniqueAlias.
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var uniqueAliasPrefix = "doltgres!|!alias!|_"
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// GenerateUniqueAlias generates a unique alias. This is thread-safe.
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func GenerateUniqueAlias() string {
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return fmt.Sprintf("%s%d", uniqueAliasPrefix, uniqueAliasCounter.Add(1))
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}
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// IsGeneratedAlias returns whether the given alias was generated using GenerateUniqueAlias.
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func IsGeneratedAlias(alias string) bool {
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if strings.HasPrefix(alias, uniqueAliasPrefix) && len(alias) > len(uniqueAliasPrefix) {
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aliasDigits := alias[len(uniqueAliasPrefix):]
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if _, err := strconv.ParseUint(aliasDigits, 10, 64); err == nil {
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return true
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}
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}
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return false
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}
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