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Merge pull request #1168 from GoogleContainerTools/revert-1152-mb_old…
…_sample Revert "remove stale example"
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# Copyright 2019 Google Inc. All Rights Reserved. | ||
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FROM golang:1.13-stretch | ||
ENV CGO_ENABLED=0 | ||
WORKDIR /go/src/ | ||
COPY go.mod . | ||
COPY go.sum . | ||
RUN go mod download | ||
COPY . . | ||
WORKDIR functions/examples | ||
RUN go build -v -o /usr/local/bin/config-function | ||
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FROM alpine:latest | ||
COPY --from=0 /usr/local/bin/config-function /usr/local/bin/config-function | ||
CMD ["config-function"] |
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// Copyright 2019 Google LLC | ||
// | ||
// 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 helloworld | ||
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import ( | ||
"fmt" | ||
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"github.com/GoogleContainerTools/kpt/functions/examples/util" | ||
"sigs.k8s.io/kustomize/kyaml/kio" | ||
"sigs.k8s.io/kustomize/kyaml/kio/filters" | ||
"sigs.k8s.io/kustomize/kyaml/yaml" | ||
) | ||
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const ( | ||
Kind = "HelloWorld" | ||
APIVersion = "examples.kpt.dev/v1alpha1" | ||
) | ||
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var _ kio.Filter = &HelloWorldFunction{} | ||
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// Filter returns a new HelloWorldFunction | ||
func Filter() kio.Filter { | ||
return &HelloWorldFunction{} | ||
} | ||
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// HelloWorldFunction implements the HelloWorld Function | ||
type HelloWorldFunction struct { | ||
// Kind is the API name. Must be HelloWorld. | ||
Kind string `yaml:"kind"` | ||
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// APIVersion is the API version. Must be examples.kpt.dev/v1alpha1 | ||
APIVersion string `yaml:"apiVersion"` | ||
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// Metadata defines instance metadata. | ||
Metadata Metadata `yaml:"metadata"` | ||
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// Spec defines the desired declarative configuration. | ||
Spec Spec `yaml:"spec"` | ||
} | ||
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type Metadata struct { | ||
// Name is the name of the HelloWorld Resources | ||
Name string `yaml:"name"` | ||
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// Namespace is the namespace of the HelloWorld Resources | ||
Namespace string `yaml:"namespace"` | ||
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// Labels are labels applied to the HelloWorld Resources | ||
Labels map[string]string `yaml:"labels"` | ||
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// Annotations are annotations applied to the HelloWorld Resources | ||
Annotations map[string]string `yaml:"annotations"` | ||
} | ||
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type Spec struct { | ||
Version string `yaml:"version"` | ||
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Port *int32 `yaml:"port"` | ||
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Replicas *int32 `yaml:"replicas"` | ||
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Selector map[string]string `yaml:"selector"` | ||
} | ||
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func (f *HelloWorldFunction) init() error { | ||
if f.Metadata.Name == "" { | ||
return fmt.Errorf("must specify HelloWorld name") | ||
} | ||
if f.Spec.Version == "" { | ||
f.Spec.Version = "0.1.0" | ||
} | ||
if f.Spec.Port == nil { | ||
var p int32 = 80 | ||
f.Spec.Port = &p | ||
} | ||
if *f.Spec.Port <= 0 { | ||
return fmt.Errorf("HelloWorld spec.port must be greater than 0") | ||
} | ||
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if f.Spec.Replicas == nil { | ||
var r int32 = 1 | ||
f.Spec.Replicas = &r | ||
} | ||
if *f.Spec.Replicas < 0 { | ||
return fmt.Errorf("HelloWorld spec.replicas must be greater than or equal to 0") | ||
} | ||
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if len(f.Spec.Selector) == 0 { | ||
return fmt.Errorf("HelloWorld spec.selector must be specified") | ||
} | ||
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if f.Metadata.Labels == nil { | ||
f.Metadata.Labels = map[string]string{} | ||
} | ||
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for k, v := range f.Spec.Selector { | ||
f.Metadata.Labels[k] = v | ||
} | ||
return nil | ||
} | ||
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func (f *HelloWorldFunction) Filter(inputs []*yaml.RNode) ([]*yaml.RNode, error) { | ||
if err := f.init(); err != nil { | ||
return nil, err | ||
} | ||
// override input values | ||
r := util.MustParseAll( | ||
util.Template{Input: f, Name: "helloworld-deployment", Template: helloWorldDeployment}, | ||
util.Template{Input: f, Name: "helloworld-service", Template: helloWorldService}, | ||
) | ||
return filters.MergeFilter{}.Filter(append(inputs, r...)) | ||
} | ||
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const helloWorldDeployment = ` | ||
apiVersion: apps/v1 | ||
kind: Deployment | ||
metadata: | ||
name: {{.Metadata.Name}} | ||
{{- if .Metadata.Namespace}} | ||
namespace: {{.Metadata.Namespace}} | ||
{{- end}} | ||
labels: | ||
{{- range $k, $v := .Metadata.Labels}} | ||
{{ $k }}: "{{ $v }}" | ||
{{- end}} | ||
spec: | ||
replicas: {{ .Spec.Replicas }} | ||
selector: | ||
matchLabels: | ||
{{- range $k, $v := .Spec.Selector}} | ||
{{ $k }}: "{{ $v }}" | ||
{{- end}} | ||
template: | ||
metadata: | ||
labels: | ||
{{- range $k, $v := .Metadata.Labels}} | ||
{{ $k }}: "{{ $v }}" | ||
{{- end}} | ||
spec: | ||
containers: | ||
- name: helloworld-gke | ||
image: gcr.io/kpt-dev/helloworld-gke:{{.Spec.Version}} | ||
ports: | ||
- name: http | ||
containerPort: {{.Spec.Port}} | ||
env: | ||
- name: PORT | ||
value: "{{.Spec.Port}}" | ||
` | ||
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const helloWorldService = ` | ||
apiVersion: v1 | ||
kind: Service | ||
metadata: | ||
name: {{.Metadata.Name}} | ||
{{- if .Metadata.Namespace}} | ||
namespace: {{.Metadata.Namespace}} | ||
{{- end}} | ||
labels: | ||
{{- range $k, $v := .Metadata.Labels}} | ||
{{ $k }}: "{{ $v }}" | ||
{{- end}} | ||
spec: | ||
type: LoadBalancer | ||
selector: | ||
{{- range $k, $v := .Spec.Selector}} | ||
{{ $k }}: "{{ $v }}" | ||
{{- end}} | ||
ports: | ||
- protocol: TCP | ||
port: {{.Spec.Port}} | ||
targetPort: http | ||
` |
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// Copyright 2019 Google LLC | ||
// | ||
// 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 main implements example kpt-functions | ||
package main | ||
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import ( | ||
"fmt" | ||
"os" | ||
"path/filepath" | ||
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"github.com/GoogleContainerTools/kpt/functions/examples/helloworld" | ||
"github.com/spf13/cobra" | ||
"sigs.k8s.io/kustomize/kyaml/kio" | ||
"sigs.k8s.io/kustomize/kyaml/kio/filters" | ||
"sigs.k8s.io/kustomize/kyaml/yaml" | ||
) | ||
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func main() { | ||
cmd := &cobra.Command{ | ||
Use: "config-function", | ||
SilenceUsage: true, // don't print usage on an error | ||
RunE: (&Dispatcher{}).RunE, | ||
} | ||
if err := cmd.Execute(); err != nil { | ||
fmt.Fprintf(os.Stderr, "%v\n", err) | ||
os.Exit(1) | ||
} | ||
} | ||
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// Dispatcher dispatches to the matching API | ||
type Dispatcher struct { | ||
// IO hanldes reading / writing Resources | ||
IO *kio.ByteReadWriter | ||
} | ||
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func (d *Dispatcher) RunE(_ *cobra.Command, _ []string) error { | ||
d.IO = &kio.ByteReadWriter{ | ||
Reader: os.Stdin, | ||
Writer: os.Stdout, | ||
KeepReaderAnnotations: true, | ||
} | ||
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return kio.Pipeline{ | ||
Inputs: []kio.Reader{d.IO}, | ||
Filters: []kio.Filter{ | ||
d, // invoke the API | ||
&filters.MergeFilter{}, | ||
&filters.FileSetter{FilenamePattern: filepath.Join("config", "%n.yaml")}, | ||
&filters.FormatFilter{}, | ||
}, | ||
Outputs: []kio.Writer{d.IO}, | ||
}.Execute() | ||
} | ||
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// dispatchTable maps configFunction Kinds to implementations | ||
var dispatchTable = map[string]func() kio.Filter{ | ||
helloworld.Kind: helloworld.Filter, | ||
} | ||
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func (d *Dispatcher) Filter(inputs []*yaml.RNode) ([]*yaml.RNode, error) { | ||
// parse the API meta to find which API is being invoked | ||
meta, err := d.IO.FunctionConfig.GetMeta() | ||
if err != nil { | ||
return nil, err | ||
} | ||
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// find the implementation for this API | ||
fn := dispatchTable[meta.Kind] | ||
if fn == nil { | ||
return nil, fmt.Errorf("unsupported API type: %s", meta.Kind) | ||
} | ||
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// dispatch to the implementation | ||
fltr := fn() | ||
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// initializes the object from the config | ||
if err := yaml.Unmarshal([]byte(d.IO.FunctionConfig.MustString()), fltr); err != nil { | ||
fmt.Fprintf(os.Stderr, "%v\n", err) | ||
fmt.Fprintf(os.Stderr, "%s\n", d.IO.FunctionConfig.MustString()) | ||
os.Exit(1) | ||
} | ||
return fltr.Filter(inputs) | ||
} |
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