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preconfig_route.go
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/
preconfig_route.go
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package main
import (
"fmt"
"regexp"
"strconv"
"strings"
)
type PreRouteItem struct {
protocol string
dest string
host string
port int
}
type PreConfigRoute struct {
items map[string]*PreRouteItem
}
func NewPreRouteItem(protocol string, dest string, nextHop string) (*PreRouteItem, error) {
pos := strings.LastIndex(nextHop, ":")
host := ""
port := 5060
if pos == -1 {
host = nextHop
if strings.EqualFold("tls", protocol) {
port = 5061
}
} else {
host = nextHop[0:pos]
var err error
port, err = strconv.Atoi(nextHop[pos+1:])
if err != nil {
return nil, err
}
}
return &PreRouteItem{protocol: protocol,
dest: dest,
host: host,
port: port}, nil
}
func NewPreConfigRoute() *PreConfigRoute {
return &PreConfigRoute{items: make(map[string]*PreRouteItem)}
}
func (pcr *PreConfigRoute) AddRouteItem(protocol string, dest string, nextHop string) error {
item, err := NewPreRouteItem(protocol, dest, nextHop)
if err == nil {
pcr.items[dest] = item
}
return err
}
func (pcr *PreConfigRoute) FindRoute(dest string) (protocol string, host string, port int, err error) {
if item, ok := pcr.items[dest]; ok {
return item.protocol, item.host, item.port, nil
}
for _, item := range pcr.items {
matched, err := regexp.MatchString(pcr.toRegularExp(item.dest), dest)
if matched && err == nil {
return item.protocol, item.host, item.port, nil
}
}
if item, ok := pcr.items["default"]; ok {
return item.protocol, item.host, item.port, nil
}
return "", "", 0, fmt.Errorf("fail to find route for %s", dest)
}
func (pcr *PreConfigRoute) toRegularExp(s string) string {
s = strings.Replace(s, ".", "\\.", -1)
return fmt.Sprintf("^%s$", strings.Replace(s, "*", ".*", -1))
}