state

Documentation

Index

• func ContainsProfile(allProfiles, profile string) bool
• type Data
  • func ParseData(node *v1.Node) (Data, error)
  • func (d *Data) GetProfilesWithState(profilesStr string, availableProfiles map[string]Profile) []ProfileState
  • func (d *Data) MaintainPreviousStates(profilesStr string, availableProfiles map[string]Profile)
  • func (d *Data) MaintainProfileStates(profilesStr string, availableProfiles map[string]Profile)
• type NodeState
  • func FromLabel(label NodeStateLabel, chains PluginChains) (NodeState, error)
• type NodeStateLabel
  • func Apply(state NodeState, node *v1.Node, data *Data, params plugin.Parameters) (NodeStateLabel, error)
  • func ValidateLabel(s string) (NodeStateLabel, error)
• type PluginChains
• type Profile
• type ProfileSelector
• type ProfileState
• type Transition

Functions

func ContainsProfile

func ContainsProfile(allProfiles, profile string) bool

Returns whether profile is contained in the profile label value.

Types

type Data

type Data struct {
	LastTransition time.Time
	// Maps a notification instance name to the last time it was triggered.
	LastNotificationTimes map[string]time.Time
	// Current states of assigned profiles
	ProfileStates map[string]NodeStateLabel
	// States of profiles of the previous reconciliation
	PreviousStates map[string]NodeStateLabel
}

Data represents global state which is saved with a node annotation.

func ParseData

func ParseData(node *v1.Node) (Data, error)

func (*Data) GetProfilesWithState

func (d *Data) GetProfilesWithState(profilesStr string, availableProfiles map[string]Profile) []ProfileState

Returns a Profile instance with its corresponding state for each profile named in profileStr. If profileStr is an empty string, falls back to the default profile. Call MaintainProfileStates before.

func (*Data) MaintainPreviousStates

func (d *Data) MaintainPreviousStates(profilesStr string, availableProfiles map[string]Profile)

Removes previous state data for removed profile and initializes it for added profiles.

func (*Data) MaintainProfileStates

func (d *Data) MaintainProfileStates(profilesStr string, availableProfiles map[string]Profile)

Removes state data for removed profile and initializes it for added profiles.

type NodeState

type NodeState interface {
	// Label is the Label associated with the state
	Label() NodeStateLabel
	// Enter is executed when a node enters a new state.
	// Its not executed when a profile gets freshly attached.
	Enter(params plugin.Parameters, data *Data) error
	// Notify executes the notification chain if required
	Notify(params plugin.Parameters, data *Data) error
	// Trigger executes the trigger chain
	Trigger(params plugin.Parameters, next NodeStateLabel, data *Data) error
	// Trigger executes the check chain and determines, which state should be the next one.
	// If an error is returned the NodeStateLabel must match the current state.
	Transition(params plugin.Parameters, data *Data) (NodeStateLabel, error)
}

NodeState represents the state a node can be in.

func FromLabel

func FromLabel(label NodeStateLabel, chains PluginChains) (NodeState, error)

FromLabel creates a new NodeState instance identified by the label with given chains and notification interval.

type NodeStateLabel

type NodeStateLabel string

NodeStateLabel reprensents labels which nodes a marked with.

const InMaintenance NodeStateLabel = "in-maintenance"

InMaintenance is a label that marks a node which is currently in maintenance.

const Operational NodeStateLabel = "operational"

Operational is a label that marks a node which is operational.

const Required NodeStateLabel = "maintenance-required"

Required is a label that marks a node which needs to be maintenaned.

func Apply

func Apply(state NodeState, node *v1.Node, data *Data, params plugin.Parameters) (NodeStateLabel, error)

Calls all Notification Plugins, checks for a transition and invokes all trigger plugins if a transitions happens. Returns the next node state. In case of an error state.Label() is retuned alongside with the error.

func ValidateLabel

func ValidateLabel(s string) (NodeStateLabel, error)

Returns whether s as NodeStateLabel if it is valid.

type PluginChains

type PluginChains struct {
	Notification plugin.NotificationChain
	Transitions  []Transition
}

PluginChains is a struct containing a plugin chain of each plugin type.

type Profile

type Profile struct {
	Name   string
	Chains map[NodeStateLabel]PluginChains
}

Profile contains its name and attached plugin chains.

type ProfileSelector

type ProfileSelector struct {
	NodeState         NodeStateLabel
	NodeProfiles      string
	AvailableProfiles map[string]Profile
	Data              Data
}

type ProfileState

type ProfileState struct {
	Profile Profile
	State   NodeStateLabel
}

type Transition

type Transition struct {
	Check   plugin.CheckChain
	Trigger plugin.TriggerChain
	Next    NodeStateLabel
}