mirror of https://github.com/knative/client.git
102 lines
3.0 KiB
Go
102 lines
3.0 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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"errors"
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"math/rand"
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"strings"
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"text/template"
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servingv1alpha1 "github.com/knative/serving/pkg/apis/serving/v1alpha1"
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)
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// Get the revision template associated with a service.
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// Depending on the structure returned either the new v1beta1 fields or the
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// 'old' v1alpha1 fields are looked up.
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// The returned revision template can be updated in place.
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// An error is returned if no revision template could be extracted
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func RevisionTemplateOfService(service *servingv1alpha1.Service) (*servingv1alpha1.RevisionTemplateSpec, error) {
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// Try v1beta1 field first
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if service.Spec.Template != nil {
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return service.Spec.Template, nil
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}
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config, err := getConfiguration(service)
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if err != nil {
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return nil, err
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}
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return config.DeprecatedRevisionTemplate, nil
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}
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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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chars = append(chars, charChoices[rand.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 *servingv1alpha1.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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func getConfiguration(service *servingv1alpha1.Service) (*servingv1alpha1.ConfigurationSpec, error) {
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if service.Spec.DeprecatedRunLatest != nil {
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return &service.Spec.DeprecatedRunLatest.Configuration, nil
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} else if service.Spec.DeprecatedRelease != nil {
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return &service.Spec.DeprecatedRelease.Configuration, nil
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} else if service.Spec.DeprecatedPinned != nil {
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return &service.Spec.DeprecatedPinned.Configuration, nil
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} else {
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return nil, errors.New("service does not specify a Configuration")
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}
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}
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