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watches.go
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watches.go
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// Copyright 2020 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"
"helm.sh/helm/v3/pkg/chart"
"helm.sh/helm/v3/pkg/chart/loader"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"sigs.k8s.io/yaml"
)
type Watch struct {
schema.GroupVersionKind `json:",inline"`
ChartPath string `json:"chart"`
WatchDependentResources *bool `json:"watchDependentResources,omitempty"`
OverrideValues map[string]string `json:"overrideValues,omitempty"`
ReconcilePeriod *metav1.Duration `json:"reconcilePeriod,omitempty"`
MaxConcurrentReconciles *int `json:"maxConcurrentReconciles,omitempty"`
Chart *chart.Chart `json:"-"`
}
// 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
}
watches := []Watch{}
err = yaml.Unmarshal(b, &watches)
if err != nil {
return nil, err
}
watchesMap := make(map[schema.GroupVersionKind]Watch)
for i, w := range watches {
if err := verifyGVK(w.GroupVersionKind); err != nil {
return nil, fmt.Errorf("invalid GVK: %s: %w", w.GroupVersionKind, err)
}
cl, err := loader.Load(w.ChartPath)
if err != nil {
return nil, fmt.Errorf("invalid chart %s: %w", w.ChartPath, err)
}
w.Chart = cl
w.OverrideValues = expandOverrideEnvs(w.OverrideValues)
if w.WatchDependentResources == nil {
trueVal := true
w.WatchDependentResources = &trueVal
}
if _, ok := watchesMap[w.GroupVersionKind]; ok {
return nil, fmt.Errorf("duplicate GVK: %s", w.GroupVersionKind)
}
watchesMap[w.GroupVersionKind] = w
watches[i] = w
}
return watches, nil
}
func expandOverrideEnvs(in map[string]string) map[string]string {
if in == nil {
return nil
}
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
}