141 lines
3.4 KiB
Go
141 lines
3.4 KiB
Go
// Package router provides a network routing control plane
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package router
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import (
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"errors"
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"time"
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)
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var (
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// DefaultAddress is default router address
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DefaultAddress = ":8084"
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// DefaultName is default router service name
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DefaultName = "go.micro.router"
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// DefaultNetwork is default micro network
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DefaultNetwork = "micro"
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// ErrRouteNotFound is returned when no route was found in the routing table
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ErrRouteNotFound = errors.New("route not found")
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// ErrDuplicateRoute is returned when the route already exists
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ErrDuplicateRoute = errors.New("duplicate route")
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)
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// Router is an interface for a routing control plane
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type Router interface {
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// Init initializes the router with options
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Init(...Option) error
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// Options returns the router options
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Options() Options
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// The routing table
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Table() Table
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// Advertise advertises routes
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Advertise() (<-chan *Advert, error)
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// Process processes incoming adverts
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Process(*Advert) error
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// Lookup queries routes in the routing table
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Lookup(...QueryOption) ([]Route, error)
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// Watch returns a watcher which tracks updates to the routing table
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Watch(opts ...WatchOption) (Watcher, error)
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// Close the router
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Close() error
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// Returns the router implementation
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String() string
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}
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// Table is an interface for routing table
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type Table interface {
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// Create new route in the routing table
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Create(Route) error
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// Delete existing route from the routing table
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Delete(Route) error
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// Update route in the routing table
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Update(Route) error
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// List all routes in the table
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List() ([]Route, error)
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// Query routes in the routing table
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Query(...QueryOption) ([]Route, error)
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}
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// Option used by the router
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type Option func(*Options)
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// StatusCode defines router status
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type StatusCode int
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const (
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// Running means the router is up and running
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Running StatusCode = iota
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// Advertising means the router is advertising
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Advertising
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// Stopped means the router has been stopped
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Stopped
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// Error means the router has encountered error
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Error
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)
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// AdvertType is route advertisement type
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type AdvertType int
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const (
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// Announce is advertised when the router announces itself
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Announce AdvertType = iota
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// RouteUpdate advertises route updates
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RouteUpdate
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)
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// String returns human readable advertisement type
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func (t AdvertType) String() string {
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switch t {
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case Announce:
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return "announce"
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case RouteUpdate:
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return "update"
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default:
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return "unknown"
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}
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}
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// Advert contains a list of events advertised by the router to the network
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type Advert struct {
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// Id is the router Id
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Id string
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// Type is type of advert
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Type AdvertType
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// Timestamp marks the time when the update is sent
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Timestamp time.Time
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// TTL is Advert TTL
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TTL time.Duration
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// Events is a list of routing table events to advertise
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Events []*Event
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}
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// Strategy is route advertisement strategy
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type Strategy int
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// TODO: remove the "Advertise" prefix from these
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const (
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// AdvertiseAll advertises all routes to the network
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AdvertiseAll Strategy = iota
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// AdvertiseBest advertises optimal routes to the network
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AdvertiseBest
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// AdvertiseLocal will only advertise the local routes
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AdvertiseLocal
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// AdvertiseNone will not advertise any routes
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AdvertiseNone
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)
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// String returns human readable Strategy
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func (s Strategy) String() string {
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switch s {
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case AdvertiseAll:
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return "all"
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case AdvertiseBest:
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return "best"
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case AdvertiseLocal:
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return "local"
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case AdvertiseNone:
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return "none"
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default:
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return "unknown"
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}
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}
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