micro/network/router/table/query.go

109 lines
2.1 KiB
Go

package table
// LookupPolicy defines query policy
type LookupPolicy int
const (
// DiscardIfNone discards query when no route is found
DiscardIfNone LookupPolicy = iota
// ClosestMatch returns closest match to supplied query
ClosestMatch
)
// String returns human representation of LookupPolicy
func (lp LookupPolicy) String() string {
switch lp {
case DiscardIfNone:
return "DISCARD"
case ClosestMatch:
return "CLOSEST"
default:
return "UNKNOWN"
}
}
// QueryOption sets routing table query options
type QueryOption func(*QueryOptions)
// QueryOptions are routing table query options
type QueryOptions struct {
// Service is destination service name
Service string
// Gateway is route gateway
Gateway string
// Network is network address
Network string
// Policy is query lookup policy
Policy LookupPolicy
}
// QueryService sets destination address
func QueryService(s string) QueryOption {
return func(o *QueryOptions) {
o.Service = s
}
}
// QueryGateway sets route gateway
func QueryGateway(g string) QueryOption {
return func(o *QueryOptions) {
o.Gateway = g
}
}
// QueryNetwork sets route network address
func QueryNetwork(n string) QueryOption {
return func(o *QueryOptions) {
o.Network = n
}
}
// QueryPolicy sets query policy
// NOTE: this might be renamed to filter or some such
func QueryPolicy(p LookupPolicy) QueryOption {
return func(o *QueryOptions) {
o.Policy = p
}
}
// Query is routing table query
type Query interface {
// Options returns query options
Options() QueryOptions
}
// query is a basic implementation of Query
type query struct {
opts QueryOptions
}
// NewQuery creates new query and returns it
func NewQuery(opts ...QueryOption) Query {
// default options
// NOTE: by default we use DefaultNetworkMetric
qopts := QueryOptions{
Service: "*",
Gateway: "*",
Network: "*",
Policy: DiscardIfNone,
}
for _, o := range opts {
o(&qopts)
}
return &query{
opts: qopts,
}
}
// Options returns query options
func (q *query) Options() QueryOptions {
return q.opts
}
// String prints routing table query in human readable form
func (q query) String() string {
return "query"
}