service

type AddOption func(*AddOptions)

type AddOptions struct {
	FollowKey *symmetric.Key
	ReadKey   *symmetric.Key
}

type Event interface {
	format.Node

	// HeaderID returns the cid of the event header.
	HeaderID() cid.Cid

	// GetHeader loads and optionally decrypts the event header.
	// If no key is given, the header time and key methods will return an error.
	GetHeader(context.Context, format.DAGService, crypto.DecryptionKey) (EventHeader, error)

	// BodyID returns the cid of the event body.
	BodyID() cid.Cid

	// GetBody loads and optionally decrypts the event body.
	GetBody(context.Context, format.DAGService, crypto.DecryptionKey) (format.Node, error)
}

type EventHeader interface {
	format.Node

	// Time returns the wall-clock time at which this event was created.
	Time() (*time.Time, error)

	// Key returns a single-use decryption key for the event body.
	Key() (crypto.DecryptionKey, error)
}

type Record interface {
	format.Node

	// BlockID returns the cid of the node block.
	BlockID() cid.Cid

	// GetBlock loads the node block.
	GetBlock(context.Context, format.DAGService) (format.Node, error)

	// PrevID returns the cid of the previous node.
	PrevID() cid.Cid

	// Sig returns the node signature.
	Sig() []byte

	// Verify returns a non-nil error if the node signature is valid.
	Verify(pk crypto.PubKey) error
}

type Service interface {
	io.Closer

	// Host provides a network identity.
	Host() host.Host

	// DAGService provides a DAG API to the network.
	format.DAGService

	// Store persists thread details.
	Store() lstore.Logstore

	// AddThread from a multiaddress.
	AddThread(ctx context.Context, addr ma.Multiaddr, opts ...AddOption) (thread.Info, error)

	// PullThread for new records.
	PullThread(ctx context.Context, id thread.ID) error

	// DeleteThread with id.
	DeleteThread(ctx context.Context, id thread.ID) error

	// AddFollower to a thread.
	AddFollower(ctx context.Context, id thread.ID, pid peer.ID) error

	// AddRecord with body.
	AddRecord(ctx context.Context, id thread.ID, body format.Node) (ThreadRecord, error)

	// GetRecord returns the record at cid.
	GetRecord(ctx context.Context, id thread.ID, rid cid.Cid) (Record, error)

	// Subscribe returns a read-only channel of records.
	Subscribe(opts ...SubOption) Subscription
}

type SubOption func(*SubOptions)

type SubOptions struct {
	ThreadIDs thread.IDSlice
}

type Subscription interface {
	// Discard closes the subscription, disabling the reception of further records.
	Discard()

	// Channel returns the channel that receives records.
	Channel() <-chan ThreadRecord
}

type ThreadRecord interface {
	// Value returns the underlying record.
	Value() Record

	// ThreadID returns the record's thread ID.
	ThreadID() thread.ID

	// LogID returns the record's log ID.
	LogID() peer.ID
}