server

type Config struct {
	// DataDir is the data path to store peer addresses etc.
	DataDir string

	// MagicNumber is the peer-to-peer network ID to connect to.
	MagicNumber uint32

	// ProtocolVersion represent the protocol version you are supporting.
	ProtocolVersion uint32

	// Services represent which services you are supporting.
	Services uint64

	// DNSSeeds defines a list of DNS seeds for the network to discover peers.
	DNSSeeds []string

	// PermanentPeers are the peers need to be connected permanently.
	PermanentPeers []string

	// ListenAddrs are the addresses listen on to accept peer connections.
	ListenAddrs []string

	// ExternalIPs are a list of local addresses we claim to listen on to peers.
	ExternalIPs []string

	// Use UPnP to map our listening port outside of NAT
	Upnp bool

	// DefaultPort defines the default peer-to-peer port for the network.
	DefaultPort uint16

	// Disable listening for incoming connections.
	DisableListen bool

	// DisableRelayTx specifies if the remote peer should be informed to
	// not send inv messages for transactions.
	DisableRelayTx bool

	// Max number of inbound and outbound peers.
	MaxPeers int

	// Disable banning of misbehaving peers.
	DisableBanning bool

	// Maximum allowed ban score before disconnecting and banning misbehaving
	// peers.
	BanThreshold uint32

	// How long to ban misbehaving peers.  Valid time units are {s, m, h}.
	// Minimum 1 second
	BanDuration time.Duration

	// IP networks or IPs that will not be banned. (eg. 192.168.1.0/24 or ::1)
	Whitelists []*net.IPNet

	// TargetOutbound is the number of outbound network connections to maintain.
	// Defaults to 8.
	TargetOutbound int

	// OnNewPeer will be invoked when a new peer connected.
	OnNewPeer func(IPeer)

	// OnDonePeer will be invoked when a peer disconnected.
	OnDonePeer func(IPeer)

	// MakeEmptyMessage will be invoked to creates a message of the appropriate
	// concrete type based on the command.
	MakeEmptyMessage func(string) (p2p.Message, error)

	// BestHeight will be invoked to get current best height.
	BestHeight func() uint64

	// PingNonce will be invoked to get a nonce when sending a ping message.
	PingNonce func() uint64

	// PongNonce will be invoked to get a nonce when sending a ping message.
	PongNonce func() uint64

	// NAFilter is a network address filter for peers to filter relayed
	// addresses.
	NAFilter p2p.NAFilter
}

type IPeer interface {
	// ToPeer returns the underlying peer instance.
	ToPeer() *peer.Peer

	// AddBanScore increases the persistent and decaying ban score fields by the
	// values passed as parameters. If the resulting score exceeds half of the ban
	// threshold, a warning is logged including the reason provided. Further, if
	// the score is above the ban threshold, the peer will be banned and
	// disconnected.
	AddBanScore(persistent, transient uint32, reason string)

	// BanScore returns the current integer value that represents how close
	// the peer is to being banned.
	BanScore() uint32
}

type IServer interface {
	// Start begins accepting connections from peers.
	Start()

	// Stop gracefully shuts down the server by stopping and disconnecting all
	// peers and the main listener.
	Stop() error

	// ScheduleShutdown schedules a server shutdown after the specified duration.
	// It also dynamically adjusts how often to warn the server is going down based
	// on remaining duration.
	ScheduleShutdown(duration time.Duration)

	// Connect adds the provided address as a new outbound peer.  The
	// permanent flag indicates whether or not to make the peer persistent
	// and reconnect if the connection is lost.  Attempting to connect to an
	// already existing peer will return an error.
	Connect(addr string, permanent bool) error

	// RemoveByID removes the peer associated with the provided id from the
	// list of persistent peers.  Attempting to remove an id that does not
	// exist will return an error.
	RemoveByID(id uint64) error

	// RemoveByAddr removes the peer associated with the provided address
	// from the list of persistent peers.  Attempting to remove an address
	// that does not exist will return an error.
	RemoveByAddr(addr string) error

	// DisconnectByID disconnects the peer associated with the provided id.
	// This applies to both inbound and outbound peers.  Attempting to
	// remove an id that does not exist will return an error.
	DisconnectByID(id uint64) error

	// DisconnectByAddr disconnects the peer associated with the provided
	// address.  This applies to both inbound and outbound peers.
	// Attempting to remove an address that does not exist will return an
	// error.
	DisconnectByAddr(addr string) error

	// ConnectedCount returns the number of currently connected peers.
	ConnectedCount() int32

	// ConnectedPeers returns an array consisting of all connected peers.
	ConnectedPeers() []IPeer

	// PersistentPeers returns an array consisting of all the persistent
	// peers.
	PersistentPeers() []IPeer

	// BroadcastMessage sends the provided message to all currently
	// connected peers.
	BroadcastMessage(msg p2p.Message, exclPeers ...*serverPeer)
}

type NAT interface {
	// Get the external address from outside the NAT.
	GetExternalAddress() (addr net.IP, err error)
	// Add a port mapping for protocol ("udp" or "tcp") from external port to
	// internal port with description lasting for timeout.
	AddPortMapping(protocol string, externalPort, internalPort int, description string, timeout int) (mappedExternalPort int, err error)
	// Remove a previously added port mapping from external port to
	// internal port.
	DeletePortMapping(protocol string, externalPort, internalPort int) (err error)
}