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fleet.go
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fleet.go
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// Copyright 2018 Google LLC All Rights Reserved.
//
// 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 v1
import (
"agones.dev/agones/pkg"
"agones.dev/agones/pkg/apis"
"agones.dev/agones/pkg/apis/agones"
appsv1 "k8s.io/api/apps/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/intstr"
)
const (
// FleetNameLabel is the label that the name of the Fleet
// is set to on GameServerSet and GameServer the Fleet controls
FleetNameLabel = agones.GroupName + "/fleet"
)
// +genclient
// +genclient:method=GetScale,verb=get,subresource=scale,result=k8s.io/api/autoscaling/v1.Scale
// +genclient:method=UpdateScale,verb=update,subresource=scale,input=k8s.io/api/autoscaling/v1.Scale,result=k8s.io/api/autoscaling/v1.Scale
// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
// Fleet is the data structure for a Fleet resource
type Fleet struct {
metav1.TypeMeta `json:",inline"`
metav1.ObjectMeta `json:"metadata,omitempty"`
Spec FleetSpec `json:"spec"`
Status FleetStatus `json:"status"`
}
// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
// FleetList is a list of Fleet resources
type FleetList struct {
metav1.TypeMeta `json:",inline"`
metav1.ListMeta `json:"metadata,omitempty"`
Items []Fleet `json:"items"`
}
// FleetSpec is the spec for a Fleet
type FleetSpec struct {
// Replicas are the number of GameServers that should be in this set. Defaults to 0.
Replicas int32 `json:"replicas"`
// Deployment strategy
Strategy appsv1.DeploymentStrategy `json:"strategy"`
// Scheduling strategy. Defaults to "Packed".
Scheduling apis.SchedulingStrategy `json:"scheduling"`
// Template the GameServer template to apply for this Fleet
Template GameServerTemplateSpec `json:"template"`
}
// FleetStatus is the status of a Fleet
type FleetStatus struct {
// Replicas the total number of current GameServer replicas
Replicas int32 `json:"replicas"`
// ReadyReplicas are the number of Ready GameServer replicas
ReadyReplicas int32 `json:"readyReplicas"`
// ReservedReplicas are the total number of Reserved GameServer replicas in this fleet.
// Reserved instances won't be deleted on scale down, but won't cause an autoscaler to scale up.
ReservedReplicas int32 `json:"reservedReplicas"`
// AllocatedReplicas are the number of Allocated GameServer replicas
AllocatedReplicas int32 `json:"allocatedReplicas"`
// [Stage:Alpha]
// [FeatureFlag:PlayerTracking]
// Players are the current total player capacity and count for this Fleet
// +optional
Players *AggregatedPlayerStatus `json:"players,omitempty"`
}
// GameServerSet returns a single GameServerSet for this Fleet definition
func (f *Fleet) GameServerSet() *GameServerSet {
gsSet := &GameServerSet{
ObjectMeta: *f.Spec.Template.ObjectMeta.DeepCopy(),
Spec: GameServerSetSpec{
Template: f.Spec.Template,
Scheduling: f.Spec.Scheduling,
},
}
// Switch to GenerateName, so that we always get a Unique name for the GameServerSet, and there
// can be no collisions
gsSet.ObjectMeta.GenerateName = f.ObjectMeta.Name + "-"
gsSet.ObjectMeta.Name = ""
gsSet.ObjectMeta.Namespace = f.ObjectMeta.Namespace
gsSet.ObjectMeta.ResourceVersion = ""
gsSet.ObjectMeta.UID = ""
ref := metav1.NewControllerRef(f, SchemeGroupVersion.WithKind("Fleet"))
gsSet.ObjectMeta.OwnerReferences = append(gsSet.ObjectMeta.OwnerReferences, *ref)
if gsSet.ObjectMeta.Labels == nil {
gsSet.ObjectMeta.Labels = make(map[string]string, 1)
}
gsSet.ObjectMeta.Labels[FleetNameLabel] = f.ObjectMeta.Name
return gsSet
}
// ApplyDefaults applies default values to the Fleet
func (f *Fleet) ApplyDefaults() {
if f.Spec.Strategy.Type == "" {
f.Spec.Strategy.Type = appsv1.RollingUpdateDeploymentStrategyType
}
if f.Spec.Scheduling == "" {
f.Spec.Scheduling = apis.Packed
}
if f.Spec.Strategy.Type == appsv1.RollingUpdateDeploymentStrategyType {
if f.Spec.Strategy.RollingUpdate == nil {
f.Spec.Strategy.RollingUpdate = &appsv1.RollingUpdateDeployment{}
}
def := intstr.FromString("25%")
if f.Spec.Strategy.RollingUpdate.MaxSurge == nil {
f.Spec.Strategy.RollingUpdate.MaxSurge = &def
}
if f.Spec.Strategy.RollingUpdate.MaxUnavailable == nil {
f.Spec.Strategy.RollingUpdate.MaxUnavailable = &def
}
}
// Add Agones version into Fleet Annotations
if f.ObjectMeta.Annotations == nil {
f.ObjectMeta.Annotations = make(map[string]string, 1)
}
f.ObjectMeta.Annotations[VersionAnnotation] = pkg.Version
}
// GetGameServerSpec get underlying Gameserver specification
func (f *Fleet) GetGameServerSpec() *GameServerSpec {
return &f.Spec.Template.Spec
}
func (f *Fleet) validateRollingUpdate(value *intstr.IntOrString, causes *[]metav1.StatusCause, parameter string) {
r, err := intstr.GetValueFromIntOrPercent(value, 100, true)
if value.Type == intstr.String {
if err != nil || r < 1 || r > 99 {
*causes = append(*causes, metav1.StatusCause{
Type: metav1.CauseTypeFieldValueInvalid,
Field: parameter,
Message: parameter + " does not have a valid percentage value (1%-99%)",
})
}
} else {
if r < 1 {
*causes = append(*causes, metav1.StatusCause{
Type: metav1.CauseTypeFieldValueInvalid,
Field: parameter,
Message: parameter + " does not have a valid integer value (>1)",
})
}
}
}
// Validate validates the Fleet configuration.
// If a Fleet is invalid there will be > 0 values in
// the returned array
func (f *Fleet) Validate() ([]metav1.StatusCause, bool) {
causes := validateName(f)
if f.Spec.Strategy.Type == appsv1.RollingUpdateDeploymentStrategyType {
f.validateRollingUpdate(f.Spec.Strategy.RollingUpdate.MaxUnavailable, &causes, "MaxUnavailable")
f.validateRollingUpdate(f.Spec.Strategy.RollingUpdate.MaxSurge, &causes, "MaxSurge")
} else if f.Spec.Strategy.Type != appsv1.RecreateDeploymentStrategyType {
causes = append(causes, metav1.StatusCause{
Type: metav1.CauseTypeFieldValueInvalid,
Field: "Type",
Message: "Strategy Type should be one of: RollingUpdate, Recreate.",
})
}
// check Gameserver specification in a Fleet
gsCauses := validateGSSpec(f)
if len(gsCauses) > 0 {
causes = append(causes, gsCauses...)
}
objMetaCauses := validateObjectMeta(&f.Spec.Template.ObjectMeta)
if len(objMetaCauses) > 0 {
causes = append(causes, objMetaCauses...)
}
return causes, len(causes) == 0
}
// UpperBoundReplicas returns whichever is smaller,
// the value i, or the f.Spec.Replicas.
func (f *Fleet) UpperBoundReplicas(i int32) int32 {
if i > f.Spec.Replicas {
return f.Spec.Replicas
}
return i
}
// LowerBoundReplicas returns 0 (the minimum value for
// replicas) if i is < 0
func (f *Fleet) LowerBoundReplicas(i int32) int32 {
if i < 0 {
return 0
}
return i
}
// SumStatusAllocatedReplicas returns the total number of
// Status.AllocatedReplicas in the list of GameServerSets
func SumStatusAllocatedReplicas(list []*GameServerSet) int32 {
total := int32(0)
for _, gsSet := range list {
total += gsSet.Status.AllocatedReplicas
}
return total
}
// SumStatusReplicas returns the total number of
// Status.Replicas in the list of GameServerSets
func SumStatusReplicas(list []*GameServerSet) int32 {
total := int32(0)
for _, gsSet := range list {
total += gsSet.Status.Replicas
}
return total
}
// SumSpecReplicas returns the total number of
// Spec.Replicas in the list of GameServerSets
func SumSpecReplicas(list []*GameServerSet) int32 {
total := int32(0)
for _, gsSet := range list {
if gsSet != nil {
total += gsSet.Spec.Replicas
}
}
return total
}
// GetReadyReplicaCountForGameServerSets returns the total number of
// Status.ReadyReplicas in the list of GameServerSets
func GetReadyReplicaCountForGameServerSets(gss []*GameServerSet) int32 {
totalReadyReplicas := int32(0)
for _, gss := range gss {
if gss != nil {
totalReadyReplicas += gss.Status.ReadyReplicas
}
}
return totalReadyReplicas
}