mgr

type ConnMgr interface {
	io.Closer
	AddPeerConn(pid peer.ID, conn network.Conn) bool
	RemovePeerConn(pid peer.ID, conn network.Conn) bool
	ExistPeerConn(pid peer.ID, conn network.Conn) bool
	GetPeerConn(pid peer.ID) network.Conn
	GetPeerAllConn(pid peer.ID) []network.Conn
	IsConnected(pid peer.ID) bool
	IsAllowed(pid peer.ID) bool
	ExpendConn(pid peer.ID)
	MaxPeerCountAllowed() int
	PeerCount() int
	AllPeer() []peer.ID
}

type ConnSupervisor interface {
	basic.Switcher
	// SetPeerAddr will set a peer as a necessary peer and store the peer's address.
	SetPeerAddr(pid peer.ID, addr ma.Multiaddr)
	// RemovePeerAddr will unset a necessary peer.
	RemovePeerAddr(pid peer.ID)
	// RemoveAllPeer clean all necessary peers.
	RemoveAllPeer()
}

type ProtocolExchanger interface {
	// ProtocolID is the protocol.ID of exchanger service.
	// The protocol id will be registered in host.RegisterMsgPayloadHandler method.
	ProtocolID() protocol.ID
	// Handle is the msg payload handler of exchanger service.
	// It will be registered in host.Host.RegisterMsgPayloadHandler method.
	Handle() handler.MsgPayloadHandler
	// ExchangeProtocol will send protocols supported by us to the other
	// and receive protocols supported by the other.
	// This method will be invoked during connection establishing.
	ExchangeProtocol(conn network.Conn) ([]protocol.ID, error)
	// PushProtocols will send protocols supported by us to the other.
	// This method  will be invoked when new protocol registering.
	PushProtocols(pid peer.ID) error
}

type ProtocolManager interface {
	// RegisterMsgPayloadHandler register a protocol supported by us
	// and map a handler.MsgPayloadHandler to this protocol.
	RegisterMsgPayloadHandler(protocolID protocol.ID, handler handler.MsgPayloadHandler) error
	// UnregisterMsgPayloadHandler unregister a protocol supported by us.
	UnregisterMsgPayloadHandler(protocolID protocol.ID) error
	// IsRegistered return whether a protocol given is supported by us.
	IsRegistered(protocolID protocol.ID) bool
	// GetHandler return the handler.MsgPayloadHandler mapped to the protocol supported by us and id is the given.
	// If the protocol not supported by us, return nil.
	GetHandler(protocolID protocol.ID) handler.MsgPayloadHandler
	// GetSelfSupportedProtocols return a list of protocol.ID that supported by myself.
	GetSelfSupportedProtocols() []protocol.ID
	// IsPeerSupported return whether the protocol is supported by peer which id is the given pid.
	// If peer not connected to us, return false.
	IsPeerSupported(pid peer.ID, protocolID protocol.ID) bool
	// GetPeerSupportedProtocols return a list of protocol.ID
	// that supported by the peer which id is the given pid.
	GetPeerSupportedProtocols(pid peer.ID) []protocol.ID
	// SetPeerSupportedProtocols stores the protocols supported by the peer which id is the given pid.
	SetPeerSupportedProtocols(pid peer.ID, protocolIDs []protocol.ID)
	// CleanPeerSupportedProtocols remove all records of protocols supported
	// by the peer which id is the given pid.
	CleanPeerSupportedProtocols(pid peer.ID)
	// SetProtocolSupportedNotifyFunc set a function for notifying peer protocol supporting.
	SetProtocolSupportedNotifyFunc(notifyFunc ProtocolSupportNotifyFunc)
	// SetProtocolUnsupportedNotifyFunc set a function for notifying peer protocol supporting canceled.
	SetProtocolUnsupportedNotifyFunc(notifyFunc ProtocolSupportNotifyFunc)
}

type ProtocolSupportNotifyFunc func(protocolID protocol.ID, pid peer.ID)

type ReceiveStreamManager interface {
	// Reset the manager.
	Reset()
	// SetPeerReceiveStreamMaxCount set the max count allowed.
	SetPeerReceiveStreamMaxCount(max int)
	// AddPeerReceiveStream append a receiving stream to manager.
	AddPeerReceiveStream(pid peer.ID, conn network.Conn, stream network.ReceiveStream) error
	// RemovePeerReceiveStream remove a receiving stream from manager.
	RemovePeerReceiveStream(pid peer.ID, conn network.Conn, stream network.ReceiveStream) error
	// GetCurrentPeerReceiveStreamCount return current count of receive streams
	// whose remote peer id is the given pid.
	GetCurrentPeerReceiveStreamCount(pid peer.ID) int
	// ClosePeerReceiveStreams will close all the receiving streams whose remote
	// peer id is the given pid and which created by the given connection.
	ClosePeerReceiveStreams(pid peer.ID, conn network.Conn) error
}

type SendStreamPool interface {
	io.Closer
	// Conn return the connection which send streams created by.
	Conn() network.Conn
	// InitStreams will open few send streams with the connection.
	InitStreams() error
	// BorrowStream get a sending stream from send stream queue in pool.
	// The stream borrowed should be return to this pool after sending data success,
	// or should be dropped by invoking DropStream method when errors found in sending data process.
	BorrowStream() (network.SendStream, error)
	// ReturnStream return a sending stream borrowed from this pool before.
	ReturnStream(network.SendStream) error
	// DropStream will close the sending stream then drop it.
	// This method should be invoked only when errors found.
	DropStream(network.SendStream)
	// MaxSize return cap of this pool.
	MaxSize() int
	// CurrentSize return current size of this pool.
	CurrentSize() int
	// IdleSize return current count of idle send stream.
	IdleSize() int
}

type SendStreamPoolManager interface {
	// Reset the manager.
	Reset()
	// AddPeerConnSendStreamPool append a stream pool for a connection of peer.
	AddPeerConnSendStreamPool(pid peer.ID, conn network.Conn, streamPool SendStreamPool) error
	// RemovePeerConnAndCloseSendStreamPool remove a connection of peer
	// and close the stream pool for it.
	RemovePeerConnAndCloseSendStreamPool(pid peer.ID, conn network.Conn) error
	// GetPeerBestConnSendStreamPool return a stream pool for the best connection of peer.
	GetPeerBestConnSendStreamPool(pid peer.ID) SendStreamPool
}