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Camila Macedo
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Original file line number | Diff line number | Diff line change |
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/* | ||
Copyright 2019 The Kubernetes Authors. | ||
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, | ||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
See the License for the specific language governing permissions and | ||
limitations under the License. | ||
*/ | ||
|
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package v3 | ||
|
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import ( | ||
"fmt" | ||
"hash/fnv" | ||
"path/filepath" | ||
"text/template" | ||
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"sigs.k8s.io/kubebuilder/pkg/model/file" | ||
) | ||
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const defaultMainPath = "main.go" | ||
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var _ file.Template = &Main{} | ||
var _ file.UseCustomFuncMap = &Main{} | ||
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// Main scaffolds the controller manager entry point | ||
type Main struct { | ||
file.TemplateMixin | ||
file.BoilerplateMixin | ||
file.DomainMixin | ||
file.RepositoryMixin | ||
} | ||
|
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// SetTemplateDefaults implements file.Template | ||
func (f *Main) SetTemplateDefaults() error { | ||
if f.Path == "" { | ||
f.Path = filepath.Join(defaultMainPath) | ||
} | ||
|
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f.TemplateBody = fmt.Sprintf(mainTemplate, | ||
file.NewMarkerFor(f.Path, importMarker), | ||
file.NewMarkerFor(f.Path, addSchemeMarker), | ||
file.NewMarkerFor(f.Path, setupMarker), | ||
) | ||
|
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return nil | ||
} | ||
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func hash(s string) (string, error) { | ||
hasher := fnv.New32a() | ||
hasher.Write([]byte(s)) // nolint:errcheck | ||
return fmt.Sprintf("%x", hasher.Sum(nil)), nil | ||
} | ||
|
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// GetFuncMap implements file.UseCustomFuncMap | ||
func (f *Main) GetFuncMap() template.FuncMap { | ||
fm := file.DefaultFuncMap() | ||
fm["hash"] = hash | ||
return fm | ||
} | ||
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var _ file.Inserter = &MainUpdater{} | ||
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// MainUpdater updates main.go to run Controllers | ||
type MainUpdater struct { //nolint:maligned | ||
file.RepositoryMixin | ||
file.MultiGroupMixin | ||
file.ResourceMixin | ||
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// Flags to indicate which parts need to be included when updating the file | ||
WireResource, WireController, WireWebhook bool | ||
} | ||
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// GetPath implements Builder | ||
func (*MainUpdater) GetPath() string { | ||
return defaultMainPath | ||
} | ||
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// GetIfExistsAction implements Builder | ||
func (*MainUpdater) GetIfExistsAction() file.IfExistsAction { | ||
return file.Overwrite | ||
} | ||
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const ( | ||
importMarker = "imports" | ||
addSchemeMarker = "scheme" | ||
setupMarker = "builder" | ||
) | ||
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// GetMarkers implements file.Inserter | ||
func (f *MainUpdater) GetMarkers() []file.Marker { | ||
return []file.Marker{ | ||
file.NewMarkerFor(defaultMainPath, importMarker), | ||
file.NewMarkerFor(defaultMainPath, addSchemeMarker), | ||
file.NewMarkerFor(defaultMainPath, setupMarker), | ||
} | ||
} | ||
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const ( | ||
apiImportCodeFragment = `%s "%s" | ||
` | ||
controllerImportCodeFragment = `"%s/controllers" | ||
` | ||
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multiGroupControllerImportCodeFragment = `%scontrollers "%s/controllers/%s" | ||
` | ||
addschemeCodeFragment = `utilruntime.Must(%s.AddToScheme(scheme)) | ||
` | ||
reconcilerSetupCodeFragment = `if err = (&controllers.%sReconciler{ | ||
Client: mgr.GetClient(), | ||
Log: ctrl.Log.WithName("controllers").WithName("%s"), | ||
Scheme: mgr.GetScheme(), | ||
}).SetupWithManager(mgr); err != nil { | ||
setupLog.Error(err, "unable to create controller", "controller", "%s") | ||
os.Exit(1) | ||
} | ||
` | ||
multiGroupReconcilerSetupCodeFragment = `if err = (&%scontrollers.%sReconciler{ | ||
Client: mgr.GetClient(), | ||
Log: ctrl.Log.WithName("controllers").WithName("%s").WithName("%s"), | ||
Scheme: mgr.GetScheme(), | ||
}).SetupWithManager(mgr); err != nil { | ||
setupLog.Error(err, "unable to create controller", "controller", "%s") | ||
os.Exit(1) | ||
} | ||
` | ||
webhookSetupCodeFragment = `if err = (&%s.%s{}).SetupWebhookWithManager(mgr); err != nil { | ||
setupLog.Error(err, "unable to create webhook", "webhook", "%s") | ||
os.Exit(1) | ||
} | ||
` | ||
) | ||
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// GetCodeFragments implements file.Inserter | ||
func (f *MainUpdater) GetCodeFragments() file.CodeFragmentsMap { | ||
fragments := make(file.CodeFragmentsMap, 3) | ||
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// If resource is not being provided we are creating the file, not updating it | ||
if f.Resource == nil { | ||
return fragments | ||
} | ||
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// Generate import code fragments | ||
imports := make([]string, 0) | ||
imports = append(imports, fmt.Sprintf(apiImportCodeFragment, f.Resource.ImportAlias, f.Resource.Package)) | ||
if f.WireController { | ||
if !f.MultiGroup { | ||
imports = append(imports, fmt.Sprintf(controllerImportCodeFragment, f.Repo)) | ||
} else { | ||
imports = append(imports, fmt.Sprintf(multiGroupControllerImportCodeFragment, | ||
f.Resource.GroupPackageName, f.Repo, f.Resource.Group)) | ||
} | ||
} | ||
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// Generate add scheme code fragments | ||
addScheme := make([]string, 0) | ||
addScheme = append(addScheme, fmt.Sprintf(addschemeCodeFragment, f.Resource.ImportAlias)) | ||
|
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// Generate setup code fragments | ||
setup := make([]string, 0) | ||
if f.WireController { | ||
if !f.MultiGroup { | ||
setup = append(setup, fmt.Sprintf(reconcilerSetupCodeFragment, | ||
f.Resource.Kind, f.Resource.Kind, f.Resource.Kind)) | ||
} else { | ||
setup = append(setup, fmt.Sprintf(multiGroupReconcilerSetupCodeFragment, | ||
f.Resource.GroupPackageName, f.Resource.Kind, f.Resource.Group, f.Resource.Kind, f.Resource.Kind)) | ||
} | ||
} | ||
if f.WireWebhook { | ||
setup = append(setup, fmt.Sprintf(webhookSetupCodeFragment, | ||
f.Resource.ImportAlias, f.Resource.Kind, f.Resource.Kind)) | ||
} | ||
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// Only store code fragments in the map if the slices are non-empty | ||
if len(imports) != 0 { | ||
fragments[file.NewMarkerFor(defaultMainPath, importMarker)] = imports | ||
} | ||
if len(addScheme) != 0 { | ||
fragments[file.NewMarkerFor(defaultMainPath, addSchemeMarker)] = addScheme | ||
} | ||
if len(setup) != 0 { | ||
fragments[file.NewMarkerFor(defaultMainPath, setupMarker)] = setup | ||
} | ||
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return fragments | ||
} | ||
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var mainTemplate = `{{ .Boilerplate }} | ||
package main | ||
import ( | ||
"flag" | ||
"os" | ||
"k8s.io/apimachinery/pkg/runtime" | ||
utilruntime "k8s.io/apimachinery/pkg/util/runtime" | ||
clientgoscheme "k8s.io/client-go/kubernetes/scheme" | ||
_ "k8s.io/client-go/plugin/pkg/client/auth/gcp" | ||
ctrl "sigs.k8s.io/controller-runtime" | ||
"sigs.k8s.io/controller-runtime/pkg/log/zap" | ||
%s | ||
) | ||
var ( | ||
scheme = runtime.NewScheme() | ||
setupLog = ctrl.Log.WithName("setup") | ||
) | ||
func init() { | ||
utilruntime.Must(clientgoscheme.AddToScheme(scheme)) | ||
%s | ||
} | ||
func main() { | ||
var metricsAddr string | ||
var enableLeaderElection bool | ||
flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.") | ||
flag.BoolVar(&enableLeaderElection, "enable-leader-election", false, | ||
"Enable leader election for controller manager. " + | ||
"Enabling this will ensure there is only one active controller manager.") | ||
flag.Parse() | ||
ctrl.SetLogger(zap.New(zap.UseDevMode(true))) | ||
mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{ | ||
Scheme: scheme, | ||
MetricsBindAddress: metricsAddr, | ||
Port: 9443, | ||
LeaderElection: enableLeaderElection, | ||
LeaderElectionID: "{{ hash .Repo }}.{{ .Domain }}", | ||
}) | ||
if err != nil { | ||
setupLog.Error(err, "unable to start manager") | ||
os.Exit(1) | ||
} | ||
%s | ||
setupLog.Info("starting manager") | ||
if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil { | ||
setupLog.Error(err, "problem running manager") | ||
os.Exit(1) | ||
} | ||
} | ||
` |
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