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package locRIB
import (
"fmt"
"math"
"sync"
"github.com/bio-routing/bio-rd/net"
"github.com/bio-routing/bio-rd/route"
"github.com/bio-routing/bio-rd/routingtable"
)
// LocRIB represents a routing information base
type LocRIB struct {
routingtable.ClientManager
rt *routingtable.RoutingTable
mu sync.RWMutex
}
// New creates a new routing information base
func New() *LocRIB {
a := &LocRIB{
rt: routingtable.NewRoutingTable(),
}
a.ClientManager = routingtable.NewClientManager(a)
return a
}
// UpdateNewClient sends current state to a new client
func (a *LocRIB) UpdateNewClient(client routingtable.RouteTableClient) error {
a.mu.RLock()
defer a.mu.RUnlock()
routes := a.rt.Dump()
for _, r := range routes {
a.propagateChanges(&route.Route{}, r)
}
return nil
}
// AddPath replaces the path for prefix `pfx`. If the prefix doesn't exist it is added.
func (a *LocRIB) AddPath(pfx net.Prefix, p *route.Path) error {
a.mu.Lock()
defer a.mu.Unlock()
routeExisted := false
oldRoute := &route.Route{}
r := a.rt.Get(pfx)
if r != nil {
oldRoute = r.Copy()
routeExisted = true
}
a.rt.AddPath(pfx, p)
if !routeExisted {
r = a.rt.Get(pfx)
}
r.PathSelection()
newRoute := r.Copy()
fmt.Printf("NEW: %v\n", newRoute.Paths())
fmt.Printf("OLD: %v\n", oldRoute.Paths())
a.propagateChanges(oldRoute, newRoute)
return nil
}
// RemovePath removes the path for prefix `pfx`
func (a *LocRIB) RemovePath(pfx net.Prefix, p *route.Path) bool {
a.mu.Lock()
defer a.mu.Unlock()
var oldRoute *route.Route
r := a.rt.Get(pfx)
if r != nil {
oldRoute = r.Copy()
}
a.rt.RemovePath(pfx, p)
r.PathSelection()
r = a.rt.Get(pfx)
newRoute := r.Copy()
fmt.Printf("NEW: %v\n", newRoute.Paths())
fmt.Printf("OLD: %v\n", oldRoute.Paths())
a.propagateChanges(oldRoute, newRoute)
return true
}
func (a *LocRIB) propagateChanges(oldRoute *route.Route, newRoute *route.Route) {
a.removePathsFromClients(oldRoute, newRoute)
a.addPathsToClients(oldRoute, newRoute)
}
func (a *LocRIB) addPathsToClients(oldRoute *route.Route, newRoute *route.Route) {
for _, client := range a.ClientManager.Clients() {
opts := a.ClientManager.GetOptions(client)
oldMaxPaths := opts.GetMaxPaths(oldRoute.ECMPPathCount())
newMaxPaths := opts.GetMaxPaths(newRoute.ECMPPathCount())
oldPathsLimit := int(math.Min(float64(oldMaxPaths), float64(len(oldRoute.Paths()))))
newPathsLimit := int(math.Min(float64(newMaxPaths), float64(len(newRoute.Paths()))))
advertise := route.PathsDiff(newRoute.Paths()[0:newPathsLimit], oldRoute.Paths()[0:oldPathsLimit])
fmt.Printf("ADVERTISING PATHS %v TO CLIENTS\n", advertise)
for _, p := range advertise {
client.AddPath(newRoute.Prefix(), p)
}
}
}
func (a *LocRIB) removePathsFromClients(oldRoute *route.Route, newRoute *route.Route) {
for _, client := range a.ClientManager.Clients() {
opts := a.ClientManager.GetOptions(client)
oldMaxPaths := opts.GetMaxPaths(oldRoute.ECMPPathCount())
newMaxPaths := opts.GetMaxPaths(newRoute.ECMPPathCount())
oldPathsLimit := int(math.Min(float64(oldMaxPaths), float64(len(oldRoute.Paths()))))
newPathsLimit := int(math.Min(float64(newMaxPaths), float64(len(newRoute.Paths()))))
withdraw := route.PathsDiff(oldRoute.Paths()[0:oldPathsLimit], newRoute.Paths()[0:newPathsLimit])
for _, p := range withdraw {
client.RemovePath(newRoute.Prefix(), p)
}
}
}
func (a *LocRIB) Print() string {
a.mu.RLock()
defer a.mu.RUnlock()
ret := "Loc-RIB DUMP:\n"
routes := a.rt.Dump()
for _, r := range routes {
ret += fmt.Sprintf("%s\n", r.Prefix().String())
}
return ret
}