micro/router/router.go
Asim Aslam 563768b58a
v3 refactor (#1868)
* Move to v3

Co-authored-by: Ben Toogood <bentoogood@gmail.com>
2020-07-27 13:22:00 +01:00

141 lines
3.4 KiB
Go

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