コード例 #1
0
ファイル: policy.go プロジェクト: ttaanngg/gobgp
// compare community in the message's attribute with
// the one in the condition.
func (c *CommunityCondition) evaluate(path *table.Path) bool {

	communities := path.GetCommunities()

	if len(communities) == 0 {
		return false
	}

	makeStr := func(c uint32) string {
		upper := strconv.FormatUint(uint64(c&0xFFFF0000>>16), 10)
		lower := strconv.FormatUint(uint64(c&0x0000FFFF), 10)
		return upper + ":" + lower
	}

	var strCommunities []string = nil
	matched := false
	idx := -1
	for _, member := range c.CommunityList {
		if member.isRegExp {

			if strCommunities == nil {
				// create community string.
				strCommunities = make([]string, len(communities))
				for i, c := range communities {
					strCommunities[i] = makeStr(c)
				}
			}

			for i, c := range strCommunities {
				if member.communityRegExp.MatchString(c) {
					matched = true
					idx = i
					log.WithFields(log.Fields{
						"Topic":  "Policy",
						"RegExp": member.communityRegExp.String(),
					}).Debug("community regexp used")
					break
				}
			}

		} else {
			for i, c := range communities {
				if c == member.community {
					matched = true
					idx = i
					break
				}
			}
		}

		if matched {
			log.WithFields(log.Fields{
				"Topic":     "Policy",
				"Condition": "Community",
				"Community": makeStr(communities[idx]),
			}).Debug("condition matched")

			return true
		}
	}
	return false
}