127 lines
4.0 KiB
Go
127 lines
4.0 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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package migration
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import (
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"k8s.io/klog"
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"k8s.io/kubernetes/pkg/scheduler/algorithm/predicates"
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framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
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)
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const (
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// PredicatesStateKey is the key in CycleState to PredicateStateData
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PredicatesStateKey = "predicates"
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// PrioritiesStateKey is the key in CycleState to PrioritiesStateData
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PrioritiesStateKey = "priorities"
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)
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// PredicateResultToFrameworkStatus converts a predicate result (PredicateFailureReason + error)
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// to a framework status.
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func PredicateResultToFrameworkStatus(reasons []predicates.PredicateFailureReason, err error) *framework.Status {
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if s := ErrorToFrameworkStatus(err); s != nil {
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return s
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}
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if len(reasons) == 0 {
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return nil
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}
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code := framework.Unschedulable
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if predicates.UnresolvablePredicateExists(reasons) {
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code = framework.UnschedulableAndUnresolvable
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}
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// We will keep all failure reasons.
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var failureReasons []string
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for _, reason := range reasons {
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failureReasons = append(failureReasons, reason.GetReason())
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}
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return framework.NewStatus(code, failureReasons...)
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}
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// ErrorToFrameworkStatus converts an error to a framework status.
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func ErrorToFrameworkStatus(err error) *framework.Status {
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if err != nil {
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return framework.NewStatus(framework.Error, err.Error())
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}
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return nil
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}
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// PredicatesStateData is a pointer to Metadata. In the normal case, StateData is supposed to
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// be generated and stored in CycleState by a framework plugin (like a PreFilter pre-computing data for
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// its corresponding Filter). However, during migration, the scheduler will inject a pointer to
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// Metadata into CycleState. This "hack" is necessary because during migration Filters that implement
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// predicates functionality will be calling into the existing predicate functions, and need
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// to pass Metadata.
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type PredicatesStateData struct {
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Reference interface{}
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}
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// Clone is supposed to make a copy of the data, but since this is just a pointer, we are practically
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// just copying the pointer. This is ok because the actual reference to the Metadata
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// copy that is made by generic_scheduler during preemption cycle will be injected again outside
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// the framework.
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func (p *PredicatesStateData) Clone() framework.StateData {
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return &PredicatesStateData{
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Reference: p.Reference,
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}
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}
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// PrioritiesStateData is a pointer to PrioritiesMetadata.
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type PrioritiesStateData struct {
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Reference interface{}
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}
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// Clone is supposed to make a copy of the data, but since this is just a pointer, we are practically
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// just copying the pointer.
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func (p *PrioritiesStateData) Clone() framework.StateData {
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return &PrioritiesStateData{
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Reference: p.Reference,
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}
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}
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// PriorityMetadata returns priority metadata stored in CycleState.
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func PriorityMetadata(state *framework.CycleState) interface{} {
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if state == nil {
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return nil
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}
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var meta interface{}
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if s, err := state.Read(PrioritiesStateKey); err == nil {
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meta = s.(*PrioritiesStateData).Reference
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} else {
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klog.Errorf("reading key %q from CycleState, continuing without metadata: %v", PrioritiesStateKey, err)
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}
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return meta
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}
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// PredicateMetadata returns predicate metadata stored in CycleState.
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func PredicateMetadata(state *framework.CycleState) interface{} {
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if state == nil {
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return nil
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}
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var meta interface{}
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if s, err := state.Read(PredicatesStateKey); err == nil {
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meta = s.(*PredicatesStateData).Reference
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} else {
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klog.Errorf("reading key %q from CycleState, continuing without metadata: %v", PredicatesStateKey, err)
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}
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return meta
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}
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