subnet

package
v0.9.1 Latest Latest
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Published: Nov 22, 2017 License: Apache-2.0 Imports: 10 Imported by: 0

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Index

Constants

This section is empty.

Variables

View Source
var (
	ErrLeaseTaken  = errors.New("subnet: lease already taken")
	ErrNoMoreTries = errors.New("subnet: no more tries")
)

Functions

func MakeSubnetKey added in v0.5.6

func MakeSubnetKey(sn ip.IP4Net) string

func ParseSubnetKey added in v0.5.6

func ParseSubnetKey(s string) *ip.IP4Net

func WatchLease added in v0.5.6

func WatchLease(ctx context.Context, sm Manager, sn ip.IP4Net, receiver chan Event)

WatchLease performs a long term watch of the given network's subnet lease and communicates addition/deletion events on receiver channel. It takes care of handling "fall-behind" logic where the history window has advanced too far and it needs to diff the latest snapshot with its saved state and generate events

func WatchLeases added in v0.5.0

func WatchLeases(ctx context.Context, sm Manager, ownLease *Lease, receiver chan []Event)

WatchLeases performs a long term watch of the given network's subnet leases and communicates addition/deletion events on receiver channel. It takes care of handling "fall-behind" logic where the history window has advanced too far and it needs to diff the latest snapshot with its saved state and generate events

Types

type Config

type Config struct {
	Network     ip.IP4Net
	SubnetMin   ip.IP4
	SubnetMax   ip.IP4
	SubnetLen   uint
	BackendType string          `json:"-"`
	Backend     json.RawMessage `json:",omitempty"`
}

func ParseConfig

func ParseConfig(s string) (*Config, error)

type Event

type Event struct {
	Type  EventType `json:"type"`
	Lease Lease     `json:"lease,omitempty"`
}

type EventType

type EventType int
const (
	EventAdded EventType = iota
	EventRemoved
)

func (EventType) MarshalJSON added in v0.5.0

func (et EventType) MarshalJSON() ([]byte, error)

func (*EventType) UnmarshalJSON added in v0.5.0

func (et *EventType) UnmarshalJSON(data []byte) error

type Lease added in v0.5.0

type Lease struct {
	Subnet     ip.IP4Net
	Attrs      LeaseAttrs
	Expiration time.Time

	Asof uint64
}

func (*Lease) Key added in v0.5.0

func (l *Lease) Key() string

type LeaseAttrs added in v0.2.0

type LeaseAttrs struct {
	PublicIP    ip.IP4
	BackendType string          `json:",omitempty"`
	BackendData json.RawMessage `json:",omitempty"`
}

type LeaseWatchResult added in v0.5.6

type LeaseWatchResult struct {
	// Either Events or Snapshot will be set.  If Events is empty, it means
	// the cursor was out of range and Snapshot contains the current list
	// of items, even if empty.
	Events   []Event     `json:"events"`
	Snapshot []Lease     `json:"snapshot"`
	Cursor   interface{} `json:"cursor"`
}

type Manager added in v0.5.0

type Manager interface {
	GetNetworkConfig(ctx context.Context) (*Config, error)
	AcquireLease(ctx context.Context, attrs *LeaseAttrs) (*Lease, error)
	RenewLease(ctx context.Context, lease *Lease) error
	WatchLease(ctx context.Context, sn ip.IP4Net, cursor interface{}) (LeaseWatchResult, error)
	WatchLeases(ctx context.Context, cursor interface{}) (LeaseWatchResult, error)

	Name() string
}

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