92 lines
1.8 KiB
Go
92 lines
1.8 KiB
Go
package table
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import (
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"fmt"
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"hash/fnv"
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"strings"
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"github.com/olekukonko/tablewriter"
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)
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var (
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// DefaultLocalMetric is default route cost metric for the local network
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DefaultLocalMetric = 1
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// DefaultNetworkMetric is default route cost metric for the micro network
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DefaultNetworkMetric = 10
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)
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// RoutePolicy defines routing table policy
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type RoutePolicy int
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const (
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// Insert inserts a new route if it does not already exist
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Insert RoutePolicy = iota
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// Override overrides the route if it already exists
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Override
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// Skip skips modifying the route if it already exists
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Skip
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)
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// String returns human reprensentation of policy
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func (p RoutePolicy) String() string {
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switch p {
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case Insert:
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return "INSERT"
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case Override:
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return "OVERRIDE"
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case Skip:
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return "SKIP"
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default:
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return "UNKNOWN"
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}
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}
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// Route is network route
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type Route struct {
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// Destination is destination address
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Destination string
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// Gateway is route gateway
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Gateway string
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// Router is the router address
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Router string
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// Network is network address
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Network string
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// Metric is the route cost metric
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Metric int
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// Policy defines route policy
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Policy RoutePolicy
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}
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// Hash returns route hash sum.
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func (r *Route) Hash() uint64 {
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h := fnv.New64()
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h.Reset()
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h.Write([]byte(r.Destination + r.Gateway + r.Network))
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return h.Sum64()
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}
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// String returns human readable route
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func (r Route) String() string {
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// this will help us build routing table string
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sb := &strings.Builder{}
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// create nice table printing structure
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table := tablewriter.NewWriter(sb)
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table.SetHeader([]string{"Destination", "Gateway", "Router", "Network", "Metric"})
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strRoute := []string{
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r.Destination,
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r.Gateway,
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r.Router,
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r.Network,
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fmt.Sprintf("%d", r.Metric),
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}
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table.Append(strRoute)
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// render table into sb
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table.Render()
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return sb.String()
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}
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