72 lines
2.4 KiB
Go
72 lines
2.4 KiB
Go
/*
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Copyright 2019 The Tekton Authors
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package names
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import (
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"fmt"
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"regexp"
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utilrand "k8s.io/apimachinery/pkg/util/rand"
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)
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// NameGenerator generates names for objects. Some backends may have more information
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// available to guide selection of new names and this interface hides those details.
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type NameGenerator interface {
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// RestrictLengthWithRandomSuffix generates a valid name from the base name, adding a random suffix to the
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// the base. If base is valid, the returned name must also be valid. The generator is
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// responsible for knowing the maximum valid name length.
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RestrictLengthWithRandomSuffix(base string) string
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// RestrictLength generates a valid name from the name of a step specified in a Task,
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// shortening it to the maximum valid name length if needed.
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RestrictLength(base string) string
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}
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// simpleNameGenerator generates random names.
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type simpleNameGenerator struct{}
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// SimpleNameGenerator is a generator that returns the name plus a random suffix of five alphanumerics
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// when a name is requested. The string is guaranteed to not exceed the length of a standard Kubernetes
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// name (63 characters)
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var SimpleNameGenerator NameGenerator = simpleNameGenerator{}
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const (
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// TODO: make this flexible for non-core resources with alternate naming rules.
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maxNameLength = 63
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randomLength = 5
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maxGeneratedNameLength = maxNameLength - randomLength - 1
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)
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func (simpleNameGenerator) RestrictLengthWithRandomSuffix(base string) string {
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if len(base) > maxGeneratedNameLength {
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base = base[:maxGeneratedNameLength]
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}
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return fmt.Sprintf("%s-%s", base, utilrand.String(randomLength))
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}
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func (simpleNameGenerator) RestrictLength(base string) string {
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if len(base) > maxNameLength {
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base = base[:maxNameLength]
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}
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var isAlphaNumeric = regexp.MustCompile(`^[a-zA-Z0-9]+$`).MatchString
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for !isAlphaNumeric(base[len(base)-1:]) {
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base = base[:len(base)-1]
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}
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return base
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}
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