/
watches.go
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/
watches.go
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// Copyright 2019 The Operator-SDK 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 watches
import (
"errors"
"fmt"
"io/ioutil"
"os"
yaml "gopkg.in/yaml.v2"
"helm.sh/helm/v3/pkg/chartutil"
"k8s.io/apimachinery/pkg/runtime/schema"
)
// Watch defines options for configuring a watch for a Helm-based
// custom resource.
type Watch struct {
GroupVersionKind schema.GroupVersionKind
ChartDir string
WatchDependentResources bool
OverrideValues map[string]string
}
type yamlWatch struct {
Group string `yaml:"group"`
Version string `yaml:"version"`
Kind string `yaml:"kind"`
Chart string `yaml:"chart"`
WatchDependentResources bool `yaml:"watchDependentResources"`
OverrideValues map[string]string `yaml:"overrideValues"`
}
func (w *yamlWatch) UnmarshalYAML(unmarshal func(interface{}) error) error {
// by default, the operator will watch dependent resources
w.WatchDependentResources = true
// hide watch data in plain struct to prevent unmarshal from calling
// UnmarshalYAML again
type plain yamlWatch
return unmarshal((*plain)(w))
}
// Load loads a slice of Watches from the watch file at `path`. For each entry
// in the watches file, it verifies the configuration. If an error is
// encountered loading the file or verifying the configuration, it will be
// returned.
func Load(path string) ([]Watch, error) {
b, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
yamlWatches := []yamlWatch{}
err = yaml.Unmarshal(b, &yamlWatches)
if err != nil {
return nil, err
}
watches := []Watch{}
watchesMap := make(map[schema.GroupVersionKind]Watch)
for _, w := range yamlWatches {
gvk := schema.GroupVersionKind{
Group: w.Group,
Version: w.Version,
Kind: w.Kind,
}
if err := verifyGVK(gvk); err != nil {
return nil, fmt.Errorf("invalid GVK: %s: %w", gvk, err)
}
if _, err := chartutil.IsChartDir(w.Chart); err != nil {
return nil, fmt.Errorf("invalid chart directory %s: %w", w.Chart, err)
}
if _, ok := watchesMap[gvk]; ok {
return nil, fmt.Errorf("duplicate GVK: %s", gvk)
}
watch := Watch{
GroupVersionKind: gvk,
ChartDir: w.Chart,
WatchDependentResources: w.WatchDependentResources,
OverrideValues: expandOverrideEnvs(w.OverrideValues),
}
watchesMap[gvk] = watch
watches = append(watches, watch)
}
return watches, nil
}
func expandOverrideEnvs(in map[string]string) map[string]string {
out := make(map[string]string)
for k, v := range in {
out[k] = os.ExpandEnv(v)
}
return out
}
func verifyGVK(gvk schema.GroupVersionKind) error {
// A GVK without a group is valid. Certain scenarios may cause a GVK
// without a group to fail in other ways later in the initialization
// process.
if gvk.Version == "" {
return errors.New("version must not be empty")
}
if gvk.Kind == "" {
return errors.New("kind must not be empty")
}
return nil
}