gregor

package
v3.2.1+incompatible Latest Latest
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 Go to latest Published: Apr 10, 2019 License: BSD-3-Clause, BSD-3-Clause Imports: 5 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func URLAddParseTime 

func URLAddParseTime(s string) (string, error)

Types

type Body 

type Body interface {
	Bytes() []byte
}

type Category 

type Category interface {
	String() string
}

type DeviceID 

type DeviceID interface {
	Bytes() []byte
	String() string
}

type Dismissal 

type Dismissal interface {
	MsgIDsToDismiss() []MsgID
	RangesToDismiss() []MsgRange
}

type FastLookupState 

type FastLookupState struct {
	State
	// contains filtered or unexported fields
}

func NewFastLookupState 

func NewFastLookupState(state State, table map[string]Item) FastLookupState

func (FastLookupState) Export 

func (fs FastLookupState) Export() (ProtocolState, error)

func (FastLookupState) GetItem 

func (fs FastLookupState) GetItem(msgID MsgID) (Item, bool)

func (FastLookupState) Hash 

func (fs FastLookupState) Hash() ([]byte, error)

func (FastLookupState) Items 

func (fs FastLookupState) Items() (Item, bool)

func (FastLookupState) ItemsInCategory 

func (fs FastLookupState) ItemsInCategory(c Category) ([]Item, error)

func (FastLookupState) ItemsWithCategoryPrefix 

func (fs FastLookupState) ItemsWithCategoryPrefix(c Category) ([]Item, error)

func (FastLookupState) Marshal 

func (fs FastLookupState) Marshal() ([]byte, error)

type InBandMessage 

type InBandMessage interface {
	MessageWithMetadata
	ToStateUpdateMessage() StateUpdateMessage
	ToStateSyncMessage() StateSyncMessage
	Merge(m1 InBandMessage) (InBandMessage, error)
}

type InBandMsgType 

type InBandMsgType int
const (
	InBandMsgTypeNone   InBandMsgType = 0
	InBandMsgTypeUpdate InBandMsgType = 1
	InBandMsgTypeSync   InBandMsgType = 2
)

type Item 

type Item interface {
	MessageWithMetadata
	DTime() TimeOrOffset
	RemindTimes() []TimeOrOffset
	Body() Body
	Category() Category
}

type MainLoopServer 

type MainLoopServer interface {
	ListenLoop(n net.Listener) error
}

type Message 

type Message interface {
	ToInBandMessage() InBandMessage
	ToOutOfBandMessage() OutOfBandMessage
	Marshal() ([]byte, error)
}

type MessageConsumer 

type MessageConsumer interface {
	// ConsumeMessage is called on a new incoming message to mutate the state
	// of the state machine. Of course messages can be "inband" which actually
	// perform state mutations, or might be "out-of-band" that just use the
	// Gregor broadcast mechanism to make sure that all clients get the
	// notification. It returns a version of the message to broadcast to clients.
	ConsumeMessage(ctx context.Context, m Message) (Message, error)
}

MessageConsumer consumes state update messages. It's half of the state machine protocol

type MessageWithMetadata 

type MessageWithMetadata interface {
	Metadata() Metadata
}

type Metadata 

type Metadata interface {
	UID() UID
	MsgID() MsgID
	CTime() time.Time
	DeviceID() DeviceID
	InBandMsgType() InBandMsgType
}

type MsgID 

type MsgID interface {
	Bytes() []byte
	String() string
}

type MsgRange 

type MsgRange interface {
	EndTime() TimeOrOffset
	Category() Category
	SkipMsgIDs() []MsgID
}

type ObjFactory 

type ObjFactory interface {
	MakeUID(b []byte) (UID, error)
	MakeMsgID(b []byte) (MsgID, error)
	MakeDeviceID(b []byte) (DeviceID, error)
	MakeBody(b []byte) (Body, error)
	MakeCategory(s string) (Category, error)
	MakeItem(u UID, msgid MsgID, deviceid DeviceID, ctime time.Time, c Category, dtime *time.Time, body Body) (Item, error)
	MakeReminder(i Item, seqno int, t time.Time) (Reminder, error)
	MakeReminderID(u UID, msgid MsgID, seqno int) (ReminderID, error)
	MakeDismissalByRange(uid UID, msgid MsgID, devid DeviceID, ctime time.Time, c Category, d time.Time,
		skipMsgIDs []MsgID) (InBandMessage, error)
	MakeDismissalByIDs(uid UID, msgid MsgID, devid DeviceID, ctime time.Time, d []MsgID) (InBandMessage, error)
	MakeStateSyncMessage(uid UID, msgid MsgID, devid DeviceID, ctime time.Time) (InBandMessage, error)
	MakeState(i []Item) (State, error)
	MakeStateWithLookupTable(i []Item, table map[string]Item) (State, error)
	MakeMetadata(uid UID, msgid MsgID, devid DeviceID, ctime time.Time, i InBandMsgType) (Metadata, error)
	MakeInBandMessageFromItem(i Item) (InBandMessage, error)
	MakeMessageFromInBandMessage(i InBandMessage) (Message, error)
	MakeTimeOrOffsetFromTime(t time.Time) (TimeOrOffset, error)
	MakeTimeOrOffsetFromOffset(d time.Duration) (TimeOrOffset, error)
	MakeReminderSetFromReminders([]Reminder, bool) (ReminderSet, error)
	UnmarshalState([]byte) (State, error)
	UnmarshalMessage([]byte) (Message, error)
}

type OutOfBandMessage 

type OutOfBandMessage interface {
	System() System
	UID() UID
	Body() Body
}

type ProtocolState 

type ProtocolState interface {
	State
	ProtocolName() string
}

type Reminder 

type Reminder interface {
	Item() Item
	RemindTime() time.Time
	Seqno() int
}

type ReminderID 

type ReminderID interface {
	MsgID() MsgID
	UID() UID
	Seqno() int
}

type ReminderSet 

type ReminderSet interface {
	Reminders() []Reminder
	MoreRemindersReady() bool
}

type State 

type State interface {
	Items() ([]Item, error)
	GetItem(msgID MsgID) (Item, bool)
	ItemsInCategory(c Category) ([]Item, error)
	ItemsWithCategoryPrefix(c Category) ([]Item, error)
	Marshal() ([]byte, error)
	Hash() ([]byte, error)
	Export() (ProtocolState, error)
}

type StateMachine 

type StateMachine interface {
	MessageConsumer

	// State returns the state for the user u on device d at time t.
	// d can be nil, in which case the global state (across all devices)
	// is returned. If t is nil, then use Now, otherwise, return the state
	// at the given time.
	State(ctx context.Context, u UID, d DeviceID, t TimeOrOffset) (State, error)

	// StateByCategoryPrefix returns the IBMs in the given state that match
	// the given category prefix. It's similar to calling State().ItemsInCategory()
	// but results in less data transfer.
	StateByCategoryPrefix(ctx context.Context, u UID, d DeviceID, t TimeOrOffset, cp Category) (State, error)

	// IsEphemeral returns whether the backend storage needs to be saved/restored.
	IsEphemeral() bool

	// InitState iterates through the given State's Items, setting the
	// StateMachine's storage. Note: This should only be called to
	// initialize an ephemeral StateMachine.
	InitState(s State) error

	// LatestCTime returns the CTime of the newest item for the given user & device.
	LatestCTime(ctx context.Context, u UID, d DeviceID) *time.Time

	// Clear removes all existing state from the StateMachine.
	Clear() error

	// InBandMessagesSince returns all messages since the given time
	// for the user u on device d.  If d is nil, then we'll return
	// all messages across all devices.  If d is a device, then we'll
	// return global messages and per-device messages for that device.
	InBandMessagesSince(ctx context.Context, u UID, d DeviceID, t time.Time) ([]InBandMessage, error)

	// Reminders returns a slice of non-dismissed items past their RemindTimes.
	Reminders(ctx context.Context, maxReminders int) (ReminderSet, error)

	// DeleteReminder deletes a reminder so it won't be in the queue any longer.
	DeleteReminder(ctx context.Context, r ReminderID) error

	// ObjFactory returns the ObjFactory used by this StateMachine.
	ObjFactory() ObjFactory

	// Clock returns the clockwork.Clock used by this StateMachine.
	Clock() clockwork.Clock

	// How long we lock access to reminders; after this time, it's open to other
	// consumers.
	ReminderLockDuration() time.Duration

	// Local dismissals for the device this state machine runs on
	LocalDismissals(context.Context, UID) ([]MsgID, error)

	// Set local dismissals on the state machine storage to the given list
	InitLocalDismissals(context.Context, UID, []MsgID) error

	// Consume a local dismissal in state machine storage
	ConsumeLocalDismissal(context.Context, UID, MsgID) error

	// Outbox gives all of the pending messages in the outbox
	Outbox(context.Context, UID) ([]Message, error)
	RemoveFromOutbox(context.Context, UID, MsgID) error

	// PrependToOutbox adds a slice of messages to the beginning of the outbox
	InitOutbox(context.Context, UID, []Message) error

	// ConsumeOutboxMessage add a message to the outbox
	ConsumeOutboxMessage(context.Context, UID, Message) error
}

StateMachine is the central interface of the Gregor system. Various parts of the server and client infrastructure will implement various parts of this interface, to ensure that the state machine can be replicated, and that it can be queried.

type StateSyncMessage 

type StateSyncMessage interface {
	MessageWithMetadata
}

type StateUpdateMessage 

type StateUpdateMessage interface {
	MessageWithMetadata
	Creation() Item
	Dismissal() Dismissal
}

type System 

type System interface {
	String() string
}

type TimeOrOffset 

type TimeOrOffset interface {
	Time() *time.Time
	Offset() *time.Duration
	Before(t time.Time) bool
	IsZero() bool
}

type UID 

type UID interface {
	Bytes() []byte
	String() string
}

func UIDFromMessage 

func UIDFromMessage(m Message) UID

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