micro/router/route.go

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package router
import (
"fmt"
"strings"
"github.com/olekukonko/tablewriter"
)
var (
// DefaultLocalMetric is default route cost for local network
DefaultLocalMetric = 1
// DefaultNetworkMetric is default route cost for micro network
DefaultNetworkMetric = 10
)
// RoutePolicy defines routing table addition policy
type RoutePolicy int
const (
// OverrideIfExists overrides route if it already exists
OverrideIfExists RoutePolicy = iota
// IgnoreIfExists does not modify existing route
IgnoreIfExists
)
// String returns human reprensentation of policy
func (p RoutePolicy) String() string {
switch p {
case OverrideIfExists:
return "OVERRIDE"
case IgnoreIfExists:
return "IGNORE"
default:
return "UNKNOWN"
}
}
// Route is network route
type Route struct {
// Destination is destination address
Destination string
// Router is the network router
Router Router
// Network is micro network address
Network string
// Metric is the route cost metric
Metric int
// Policy defines route policy
Policy RoutePolicy
}
// String allows to print the route
func (r *Route) String() string {
// this will help us build routing table string
sb := &strings.Builder{}
// create nice table printing structure
table := tablewriter.NewWriter(sb)
table.SetHeader([]string{"Destination", "Router", "Network", "Metric"})
strRoute := []string{
r.Destination,
r.Router.Address(),
r.Network,
fmt.Sprintf("%d", r.Metric),
}
table.Append(strRoute)
// render table into sb
table.Render()
return sb.String()
}