node_status_update_frequency.go

/*
Copyright 2021 Flant JSC

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 hooks

import (
	"encoding/json"
	"math"

	"github.com/flant/addon-operator/pkg/module_manager/go_hook"
	"github.com/flant/addon-operator/sdk"
	"github.com/flant/shell-operator/pkg/kube_events_manager/types"
	v1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
)

var _ = sdk.RegisterFunc(&go_hook.HookConfig{
	Queue: "/modules/node-manager",
	Kubernetes: []go_hook.KubernetesConfig{
		{
			Name:       "secret",
			ApiVersion: "v1",
			Kind:       "Secret",
			NamespaceSelector: &types.NamespaceSelector{
				NameSelector: &types.NameSelector{
					MatchNames: []string{"kube-system"},
				},
			},
			NameSelector: &types.NameSelector{
				MatchNames: []string{"d8-control-plane-manager-control-plane-arguments"},
			},
			FilterFunc: updateFreqFilter,
		},
	},
}, handleUpdateFreq)

func handleUpdateFreq(input *go_hook.HookInput) error {
	snap := input.Snapshots["secret"]

	if len(snap) == 0 {
		input.Values.Remove("nodeManager.internal.nodeStatusUpdateFrequency")
		return nil
	}

	args := snap[0].(nodeArguments)
	if args.NodeMonitorGracePeriodSeconds == 0 {
		input.Values.Remove("nodeManager.internal.nodeStatusUpdateFrequency")
		return nil
	}

	freq := math.Round(float64(args.NodeMonitorGracePeriodSeconds) / 4)
	input.Values.Set("nodeManager.internal.nodeStatusUpdateFrequency", freq)

	return nil
}

type nodeArguments struct {
	NodeMonitorGracePeriodSeconds int64 `json:"nodeMonitorGracePeriod,omitempty"`
}

func updateFreqFilter(obj *unstructured.Unstructured) (go_hook.FilterResult, error) {
	var secret v1.Secret

	err := sdk.FromUnstructured(obj, &secret)
	if err != nil {
		return nil, err
	}

	argData := secret.Data["arguments.json"]

	var args nodeArguments

	err = json.Unmarshal(argData, &args)

	return args, err
}