80 lines
1.5 KiB
Go
80 lines
1.5 KiB
Go
package router
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// LookupPolicy defines query policy
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type LookupPolicy int
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const (
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// DiscardNoRoute discards query when no route is found
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DiscardNoRoute LookupPolicy = iota
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// ClosestMatch returns closest match to supplied query
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ClosestMatch
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)
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// QueryOption sets routing table query options
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type QueryOption func(*QueryOptions)
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// QueryOptions are routing table query options
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type QueryOptions struct {
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// DestAddr is destination address
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DestAddr string
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// NetworkAddress is network address
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Network string
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// Policy is query lookup policy
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Policy LookupPolicy
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}
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// QueryDestAddr sets query destination address
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func QueryDestAddr(a string) QueryOption {
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return func(o *QueryOptions) {
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o.DestAddr = a
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}
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}
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// QueryNetwork sets query network address
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func QueryNetwork(a string) QueryOption {
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return func(o *QueryOptions) {
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o.Network = a
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}
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}
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// QueryPolicy sets query policy
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func QueryPolicy(p LookupPolicy) QueryOption {
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return func(o *QueryOptions) {
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o.Policy = p
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}
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}
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// Query is routing table query
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type Query interface {
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// Options returns query options
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Options() QueryOptions
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}
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// query is a basic implementation of Query
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type query struct {
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opts QueryOptions
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}
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// NewQuery creates new query and returns it
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func NewQuery(opts ...QueryOption) Query {
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// default options
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qopts := QueryOptions{
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DestAddr: "*",
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Network: "*",
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Policy: DiscardNoRoute,
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}
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for _, o := range opts {
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o(&qopts)
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}
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return &query{
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opts: qopts,
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}
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}
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// Options returns query options
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func (q *query) Options() QueryOptions {
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return q.opts
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}
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