/
render.go
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/
render.go
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// Copyright 2022 The kpt 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.
package engine
import (
"context"
"encoding/json"
iofs "io/fs"
"path"
"strings"
"github.com/GoogleContainerTools/kpt/internal/fnruntime"
fnresult "github.com/GoogleContainerTools/kpt/pkg/api/fnresult/v1"
"github.com/GoogleContainerTools/kpt/pkg/fn"
api "github.com/GoogleContainerTools/kpt/porch/api/porch/v1alpha1"
"github.com/GoogleContainerTools/kpt/porch/pkg/kpt"
"github.com/GoogleContainerTools/kpt/porch/pkg/repository"
"go.opentelemetry.io/otel/trace"
"k8s.io/klog/v2"
"sigs.k8s.io/kustomize/kyaml/filesys"
)
type renderPackageMutation struct {
runtime fn.FunctionRuntime
runnerOptions fnruntime.RunnerOptions
}
var _ mutation = &renderPackageMutation{}
func (m *renderPackageMutation) Apply(ctx context.Context, resources repository.PackageResources) (repository.PackageResources, *api.TaskResult, error) {
ctx, span := tracer.Start(ctx, "renderPackageMutation::Apply", trace.WithAttributes())
defer span.End()
fs := filesys.MakeFsInMemory()
taskResult := &api.TaskResult{
Task: &api.Task{
Type: api.TaskTypeEval,
Eval: &api.FunctionEvalTaskSpec{
Image: "render",
ConfigMap: nil,
},
},
RenderStatus: &api.RenderStatus{},
}
pkgPath, err := writeResources(fs, resources)
if err != nil {
return repository.PackageResources{}, nil, err
}
if pkgPath == "" {
// We need this for the no-resources case
// TODO: we should handle this better
klog.Warningf("skipping render as no package was found")
} else {
renderer := kpt.NewRenderer(m.runnerOptions)
result, err := renderer.Render(ctx, fs, fn.RenderOptions{
PkgPath: pkgPath,
Runtime: m.runtime,
})
if result != nil {
var rr api.ResultList
err := convertResultList(result, &rr)
if err != nil {
return repository.PackageResources{}, taskResult, err
}
taskResult.RenderStatus.Result = rr
}
if err != nil {
taskResult.RenderStatus.Err = err.Error()
return repository.PackageResources{}, taskResult, err
}
}
renderedResources, err := readResources(fs)
if err != nil {
return repository.PackageResources{}, taskResult, err
}
// TODO: There are internal tasks not represented in the API; Update the Apply interface to enable them.
return renderedResources, taskResult, nil
}
func convertResultList(in *fnresult.ResultList, out *api.ResultList) error {
if in == nil {
return nil
}
srcBytes, err := json.Marshal(in)
if err != nil {
return err
}
if err := json.Unmarshal(srcBytes, &out); err != nil {
return err
}
return nil
}
// TODO: Implement filesystem abstraction directly rather than on top of PackageResources
func writeResources(fs filesys.FileSystem, resources repository.PackageResources) (string, error) {
var packageDir string // path to the topmost directory containing Kptfile
for k, v := range resources.Contents {
dir := path.Dir(k)
if dir == "." {
dir = "/"
}
if err := fs.MkdirAll(dir); err != nil {
return "", err
}
base := path.Base(k)
if err := fs.WriteFile(path.Join(dir, base), []byte(v)); err != nil {
return "", err
}
if base == "Kptfile" {
// Found Kptfile. Check if the current directory is ancestor of the current
// topmost package directory. If so, use it instead.
if packageDir == "" || dir == "/" || strings.HasPrefix(packageDir, dir+"/") {
packageDir = dir
}
}
}
// Return topmost directory containing Kptfile
return packageDir, nil
}
func readResources(fs filesys.FileSystem) (repository.PackageResources, error) {
contents := map[string]string{}
if err := fs.Walk("/", func(path string, info iofs.FileInfo, err error) error {
if info.Mode().IsRegular() {
data, err := fs.ReadFile(path)
if err != nil {
return err
}
contents[strings.TrimPrefix(path, "/")] = string(data)
}
return nil
}); err != nil {
return repository.PackageResources{}, err
}
return repository.PackageResources{
Contents: contents,
}, nil
}