micro/router/router.go

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// Package router provides a network routing control plane
package router
import (
"time"
)
var (
// DefaultAddress is default router address
DefaultAddress = ":9093"
// DefaultName is default router service name
DefaultName = "go.micro.router"
// DefaultNetwork is default micro network
DefaultNetwork = "go.micro"
// DefaultRouter is default network router
DefaultRouter = NewRouter()
)
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// 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
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// Advertise advertises routes
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Advertise() (<-chan *Advert, error)
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// Process processes incoming adverts
Process(*Advert) error
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// Solicit advertises the whole routing table
Solicit() error
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// Lookup queries routes in the routing table
Lookup(...QueryOption) ([]Route, error)
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// Watch returns a watcher which tracks updates to the routing table
Watch(opts ...WatchOption) (Watcher, error)
// Start starts the router
Start() error
// Status returns router status
Status() Status
// Stop stops the router
Stop() error
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// Returns the router implementation
String() string
}
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// Table is an interface for routing table
type Table interface {
// Create new route in the routing table
Create(Route) error
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// Delete existing route from the routing table
Delete(Route) error
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// Update route in the routing table
Update(Route) error
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// List all routes in the table
List() ([]Route, error)
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// 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
)
func (s StatusCode) String() string {
switch s {
case Running:
return "running"
case Advertising:
return "advertising"
case Stopped:
return "stopped"
case Error:
return "error"
default:
return "unknown"
}
}
// Status is router status
type Status struct {
// Code defines router status
Code StatusCode
// Error contains error description
Error error
}
// String returns human readable status
func (s Status) String() string {
return s.Code.String()
}
// 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
// Solicitation indicates routes were solicited
Solicitation
)
// String returns human readable advertisement type
func (t AdvertType) String() string {
switch t {
case Announce:
return "announce"
case RouteUpdate:
return "update"
case Solicitation:
return "solicitation"
default:
return "unknown"
}
}
// 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
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
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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 (
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// 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 {
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case AdvertiseAll:
return "all"
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case AdvertiseBest:
return "best"
case AdvertiseLocal:
return "local"
case AdvertiseNone:
return "none"
default:
return "unknown"
}
}
// NewRouter creates new Router and returns it
func NewRouter(opts ...Option) Router {
return newRouter(opts...)
}