network

Documentation

Overview

Package network is for creating internetworks

Index

• Variables
• func PeersToProto(node Node, depth uint) *pb.Peer
• func UnpackPeerTopology(pbPeer *pb.Peer, lastSeen time.Time, depth uint) *node
• type Error
• type Network
  • func NewNetwork(opts ...Option) Network
• type Node
• type Option
  • func Address(a string) Option
  • func Advertise(a string) Option
  • func Id(id string) Option
  • func Name(n string) Option
  • func Nodes(n ...string) Option
  • func Proxy(p proxy.Proxy) Option
  • func Resolver(r resolver.Resolver) Option
  • func Router(r router.Router) Option
  • func Tunnel(t tunnel.Tunnel) Option
• type Options
  • func DefaultOptions() Options
• type Status

Variables

var (
	// NetworkChannel is the name of the tunnel channel for passing network messages
	NetworkChannel = "network"
	// ControlChannel is the name of the tunnel channel for passing control message
	ControlChannel = "control"
	// DefaultLink is default network link
	DefaultLink = "network"
	// MaxConnections is the max number of network client connections
	MaxConnections = 3
	// MaxPeerErrors is the max number of peer errors before we remove it from network graph
	MaxPeerErrors = 3
)

var (
	// ErrClientNotFound is returned when client for tunnel channel could not be found
	ErrClientNotFound = errors.New("client not found")
	// ErrPeerLinkNotFound is returned when peer link could not be found in tunnel Links
	ErrPeerLinkNotFound = errors.New("peer link not found")
	// ErrPeerMaxExceeded is returned when peer has reached its max error count limit
	ErrPeerMaxExceeded = errors.New("peer max errors exceeded")
)

var (
	// DefaultName is default network name
	DefaultName = "go.micro"
	// DefaultAddress is default network address
	DefaultAddress = ":0"
	// ResolveTime defines time interval to periodically resolve network nodes
	ResolveTime = 1 * time.Minute
	// AnnounceTime defines time interval to periodically announce node neighbours
	AnnounceTime = 1 * time.Second
	// KeepAliveTime is the time in which we want to have sent a message to a peer
	KeepAliveTime = 30 * time.Second
	// SyncTime is the time a network node requests full sync from the network
	SyncTime = 1 * time.Minute
	// PruneTime defines time interval to periodically check nodes that need to be pruned
	// due to their not announcing their presence within this time interval
	PruneTime = 90 * time.Second
)

var (
	// ErrPeerExists is returned when adding a peer which already exists
	ErrPeerExists = errors.New("peer already exists")
	// ErrPeerNotFound is returned when a peer could not be found in node topology
	ErrPeerNotFound = errors.New("peer not found")
)

var (
	// MaxDepth defines max depth of peer topology
	MaxDepth uint = 3
)

Functions

func PeersToProto

func PeersToProto(node Node, depth uint) *pb.Peer

PeersToProto returns node peers graph encoded into protobuf

func UnpackPeerTopology

func UnpackPeerTopology(pbPeer *pb.Peer, lastSeen time.Time, depth uint) *node

UnpackPeerTopology unpacks pb.Peer into node topology of given depth

Types

type Error

type Error interface {
	// Count is current count of errors
	Count() int
	// Msg is last error message
	Msg() string
}

Error is network node errors

type Network

type Network interface {
	// Node is network node
	Node
	// Initialise options
	Init(...Option) error
	// Options returns the network options
	Options() Options
	// Name of the network
	Name() string
	// Connect starts the resolver and tunnel server
	Connect() error
	// Close stops the tunnel and resolving
	Close() error
	// Client is micro client
	Client() client.Client
	// Server is micro server
	Server() server.Server
}

Network is micro network

func NewNetwork

func NewNetwork(opts ...Option) Network

NewNetwork returns a new network interface

type Node

type Node interface {
	// Id is node id
	Id() string
	// Address is node bind address
	Address() string
	// Peers returns node peers
	Peers() []Node
	// Network is the network node is in
	Network() Network
	// Status returns node status
	Status() Status
}

Node is network node

type Option

type Option func(*Options)

func Address

func Address(a string) Option

Address sets the network address

func Advertise

func Advertise(a string) Option

Advertise sets the address to advertise

func Id

func Id(id string) Option

Id sets the id of the network node

func Name

func Name(n string) Option

Name sets the network name

func Nodes

func Nodes(n ...string) Option

Nodes is a list of nodes to connect to

func Proxy

func Proxy(p proxy.Proxy) Option

Proxy sets the network proxy

func Resolver

func Resolver(r resolver.Resolver) Option

Resolver is the network resolver

func Router

func Router(r router.Router) Option

Router sets the network router

func Tunnel

func Tunnel(t tunnel.Tunnel) Option

Tunnel sets the network tunnel

type Options

type Options struct {
	// Id of the node
	Id string
	// Name of the network
	Name string
	// Address to bind to
	Address string
	// Advertise sets the address to advertise
	Advertise string
	// Nodes is a list of nodes to connect to
	Nodes []string
	// Tunnel is network tunnel
	Tunnel tunnel.Tunnel
	// Router is network router
	Router router.Router
	// Proxy is network proxy
	Proxy proxy.Proxy
	// Resolver is network resolver
	Resolver resolver.Resolver
}

Options configure network

func DefaultOptions

func DefaultOptions() Options

DefaultOptions returns network default options

type Status

type Status interface {
	// Error reports error status
	Error() Error
}

Status is node status