WIP

router/host.go

@@ -0,0 +1,71 @@
+package router
+
+import (
+	"fmt"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+const hostPattern = "^.*ip([0-9]{1,3}-[0-9]{1,3}-[0-9]{1,3}-[0-9]{1,3})-([0-9|a-z]+)(?:-?([0-9]{1,5}))?(?:\\.([a-z|A-Z|0-9|_|\\-\\.]+))?(?:\\:([0-9]{1,5}))?$"
+
+var hostRegex *regexp.Regexp
+
+func init() {
+	hostRegex = regexp.MustCompile(hostPattern)
+}
+
+type HostOpts struct {
+	TLD         string
+	EncodedPort int
+	Port        int
+}
+
+type HostInfo struct {
+	SessionId   string
+	InstanceIP  string
+	TLD         string
+	EncodedPort int
+	Port        int
+}
+
+func EncodeHost(sessionId, instanceIP string, opts HostOpts) string {
+	encodedIP := strings.Replace(instanceIP, ".", "-", -1)
+
+	sub := fmt.Sprintf("ip%s-%s", encodedIP, sessionId)
+	if opts.EncodedPort > 0 {
+		sub = fmt.Sprintf("%s-%d", sub, opts.EncodedPort)
+	}
+	if opts.TLD != "" {
+		sub = fmt.Sprintf("%s.%s", sub, opts.TLD)
+	}
+	if opts.Port > 0 {
+		sub = fmt.Sprintf("%s:%d", sub, opts.Port)
+	}
+
+	return sub
+}
+
+func DecodeHost(host string) (HostInfo, error) {
+	info := HostInfo{}
+
+	matches := hostRegex.FindStringSubmatch(host)
+	if len(matches) != 6 {
+		return HostInfo{}, fmt.Errorf("Couldn't find host in string")
+	}
+
+	info.InstanceIP = strings.Replace(matches[1], "-", ".", -1)
+	info.SessionId = matches[2]
+	info.TLD = matches[4]
+
+	if matches[3] != "" {
+		i, _ := strconv.Atoi(matches[3])
+		info.EncodedPort = i
+	}
+	if matches[5] != "" {
+		i, _ := strconv.Atoi(matches[5])
+		info.Port = i
+	}
+
+	return info, nil
+}