mirror of https://github.com/knative/client.git
75 lines
2.1 KiB
Go
75 lines
2.1 KiB
Go
// Copyright © 2019 The Knative Authors
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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 serving
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import (
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"bytes"
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"math/rand"
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"strings"
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"text/template"
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"time"
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servingv1 "knative.dev/serving/pkg/apis/serving/v1"
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)
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var revisionNameRand = rand.New(rand.NewSource(time.Now().UnixNano())) //nolint:gosec // Weak crypto is fine here, we use it for generating unique keys.
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var charChoices = []string{
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"b", "c", "d", "f", "g", "h", "j", "k", "l", "m", "n", "p", "q", "r", "s", "t", "v", "w", "x",
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"y", "z",
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}
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type revisionTemplContext struct {
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Service string
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Generation int64
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}
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func (c *revisionTemplContext) Random(l int) string {
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chars := make([]string, 0, l)
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for i := 0; i < l; i++ {
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//nolint:gosec // Weak crypto is fine here, we use it for generating unique keys.
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chars = append(chars, charChoices[revisionNameRand.Int()%len(charChoices)])
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}
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return strings.Join(chars, "")
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}
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// GenerateRevisionName returns an automatically-generated name suitable for the
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// next revision of the given service.
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func GenerateRevisionName(nameTempl string, service *servingv1.Service) (string, error) {
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templ, err := template.New("revisionName").Parse(nameTempl)
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if err != nil {
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return "", err
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}
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context := &revisionTemplContext{
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Service: service.Name,
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Generation: service.Generation + 1,
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}
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buf := new(bytes.Buffer)
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err = templ.Execute(buf, context)
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if err != nil {
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return "", err
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}
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res := buf.String()
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// Empty is ok.
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if res == "" {
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return res, nil
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}
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prefix := service.Name + "-"
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if !strings.HasPrefix(res, prefix) {
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res = prefix + res
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}
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return res, nil
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}
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