Multicast areas

[nncp.git] / src / area.go

diff --git a/src/area.go b/src/area.go
new file mode 100644 (file)
index 0000000..74c1324
--- /dev/null
+++ b/src/area.go
@@ -0,0 +1,69 @@
+/*
+NNCP -- Node to Node copy, utilities for store-and-forward data exchange
+Copyright (C) 2016-2021 Sergey Matveev <stargrave@stargrave.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, version 3 of the License.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package nncp
+
+import (
+       "errors"
+)
+
+const AreaDir = "area"
+
+var (
+       PktAreaOverhead int64
+)
+
+type AreaId [32]byte
+
+func (id AreaId) String() string {
+       return Base32Codec.EncodeToString(id[:])
+}
+
+type Area struct {
+       Name string
+       Id   *AreaId
+       Pub  *[32]byte
+       Prv  *[32]byte
+
+       Subs []*NodeId
+
+       Exec     map[string][]string
+       Incoming *string
+
+       AllowUnknown bool
+}
+
+func AreaIdFromString(raw string) (*AreaId, error) {
+       idRaw, err := Base32Codec.DecodeString(raw)
+       if err != nil {
+               return nil, err
+       }
+       if len(idRaw) != 32 {
+               return nil, errors.New("Invalid area id size")
+       }
+       areaId := new(AreaId)
+       copy(areaId[:], idRaw)
+       return areaId, nil
+}
+
+func (ctx *Ctx) AreaName(id *AreaId) string {
+       area := ctx.AreaId2Area[*id]
+       if area == nil {
+               return id.String()
+       }
+       return area.Name
+}