mirror of
https://github.com/arangodb/kube-arangodb.git
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123 lines
2.9 KiB
Go
123 lines
2.9 KiB
Go
//
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// DISCLAIMER
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//
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// Copyright 2023 ArangoDB GmbH, Cologne, Germany
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Copyright holder is ArangoDB GmbH, Cologne, Germany
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//
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package reconcile
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import (
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api "github.com/arangodb/kube-arangodb/pkg/apis/deployment/v1"
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"github.com/arangodb/kube-arangodb/pkg/util"
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"github.com/arangodb/kube-arangodb/pkg/util/errors"
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)
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type ScaleFilterFunc func(context PlanBuilderContext, status api.DeploymentStatus, group api.ServerGroup, in api.MemberStatusList) (api.MemberStatusList, bool, error)
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type ScaleSelectFunc func(context PlanBuilderContext, status api.DeploymentStatus, group api.ServerGroup, in api.MemberStatusList) (api.MemberStatus, bool, error)
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func NewScaleFilter(context PlanBuilderContext, status api.DeploymentStatus, group api.ServerGroup, in api.MemberStatusList) ScaleFilter {
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return scaleFilter{
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context: context,
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in: in,
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group: group,
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status: status,
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}
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}
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type ScaleFilter interface {
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Filter(in ScaleFilterFunc) ScaleFilter
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Select(in ScaleSelectFunc) ScaleFilter
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Get() (api.MemberStatus, error)
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}
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type scaleFilter struct {
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context PlanBuilderContext
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in api.MemberStatusList
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group api.ServerGroup
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status api.DeploymentStatus
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}
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func (s scaleFilter) Filter(in ScaleFilterFunc) ScaleFilter {
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if len(s.in) == 1 {
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return s
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}
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filtered, changed, err := in(s.context, s.status, s.group, s.in)
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if err != nil {
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return scaleFilterError{
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err: err,
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}
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}
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if changed {
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return scaleFilter{
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context: s.context,
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group: s.group,
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in: filtered,
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}
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}
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return s
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}
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func (s scaleFilter) Select(in ScaleSelectFunc) ScaleFilter {
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if len(s.in) == 1 {
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return s
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}
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selected, changed, err := in(s.context, s.status, s.group, s.in)
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if err != nil {
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return scaleFilterError{
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err: err,
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}
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}
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if changed {
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return scaleFilter{
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context: s.context,
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group: s.group,
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in: []api.MemberStatus{selected},
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}
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}
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return s
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}
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func (s scaleFilter) Get() (api.MemberStatus, error) {
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el, ok := util.RandomElement(s.in)
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if !ok {
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return api.MemberStatus{}, errors.Newf("Unable to select member")
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}
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return el, nil
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}
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type scaleFilterError struct {
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err error
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}
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func (s scaleFilterError) Filter(in ScaleFilterFunc) ScaleFilter {
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return s
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}
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func (s scaleFilterError) Select(in ScaleSelectFunc) ScaleFilter {
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return s
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}
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func (s scaleFilterError) Get() (api.MemberStatus, error) {
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return api.MemberStatus{}, s.err
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}
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