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// This file is part of gnunet-go, a GNUnet-implementation in Golang.
// Copyright (C) 2019-2022 Bernd Fix >Y<
//
// gnunet-go is free software: you can redistribute it and/or modify it
// under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License,
// or (at your option) any later version.
//
// gnunet-go 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
// Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// SPDX-License-Identifier: AGPL3.0-or-later
package zonemaster
import (
"context"
"fmt"
"io"
"gnunet/config"
"gnunet/core"
"gnunet/crypto"
"gnunet/message"
"gnunet/service"
"gnunet/service/dht/blocks"
"gnunet/transport"
"gnunet/util"
"github.com/bfix/gospel/logger"
)
type ZoneIterator struct {
zk *crypto.ZonePrivate
}
//----------------------------------------------------------------------
// "GNUnet Zonemaster" service implementation:
// The zonemaster service handles Namestore messages
//----------------------------------------------------------------------
// Service implements a GNS service
type Service struct {
Module
ZoneIters *util.Map[uint32, *ZoneIterator]
}
// NewService creates a new GNS service instance
func NewService(ctx context.Context, c *core.Core) service.Service {
// instantiate service
mod := NewModule(ctx, c)
srv := &Service{
Module: *mod,
ZoneIters: util.NewMap[uint32, *ZoneIterator](),
}
// set external function references (external services)
srv.StoreLocal = srv.StoreNamecache
srv.StoreRemote = srv.StoreDHT
return srv
}
// ServeClient processes a client channel.
func (s *Service) ServeClient(ctx context.Context, id int, mc *service.Connection) {
reqID := 0
var cancel context.CancelFunc
ctx, cancel = context.WithCancel(ctx)
for {
// receive next message from client
reqID++
logger.Printf(logger.DBG, "[zonemaster:%d:%d] Waiting for client request...\n", id, reqID)
msg, err := mc.Receive(ctx)
if err != nil {
if err == io.EOF {
logger.Printf(logger.INFO, "[zonemaster:%d:%d] Client channel closed.\n", id, reqID)
} else if err == service.ErrConnectionInterrupted {
logger.Printf(logger.INFO, "[zonemaster:%d:%d] Service operation interrupted.\n", id, reqID)
} else {
logger.Printf(logger.ERROR, "[zonemaster:%d:%d] Message-receive failed: %s\n", id, reqID, err.Error())
}
break
}
logger.Printf(logger.INFO, "[zonemaster:%d:%d] Received request: %v\n", id, reqID, msg)
// handle message
valueCtx := context.WithValue(ctx, core.CtxKey("label"), fmt.Sprintf(":%d:%d", id, reqID))
s.HandleMessage(valueCtx, nil, msg, mc)
}
// close client connection
mc.Close()
// cancel all tasks running for this session/connection
logger.Printf(logger.INFO, "[zonemaster:%d] Start closing session...\n", id)
cancel()
}
// Handle a single incoming message
func (s *Service) HandleMessage(ctx context.Context, sender *util.PeerID, msg message.Message, back transport.Responder) bool {
// assemble log label
label := ""
if v := ctx.Value("label"); v != nil {
label, _ = v.(string)
}
// perform lookup
switch m := msg.(type) {
// start new zone iteration
case *message.NamestoreZoneIterStartMsg:
zi := new(ZoneIterator)
zi.zk = m.ZoneKey
s.ZoneIters.Put(m.ID, zi, 0)
default:
//----------------------------------------------------------
// UNKNOWN message type received
//----------------------------------------------------------
logger.Printf(logger.ERROR, "[zonemaster%s] Unhandled message of type (%s)\n", label, msg.Type())
return false
}
return true
}
// storeDHT stores a GNS block in the DHT.
func (s *Service) StoreDHT(ctx context.Context, query blocks.Query, block blocks.Block) (err error) {
// assemble DHT request
req := message.NewDHTP2PPutMsg(block)
req.Flags = query.Flags()
req.Key = query.Key().Clone()
// store block
_, err = service.RequestResponse(ctx, "zonemaster", "dht", config.Cfg.DHT.Service.Socket, req, false)
return
}
// storeNamecache stores a GNS block in the local namecache.
func (s *Service) StoreNamecache(ctx context.Context, query *blocks.GNSQuery, block *blocks.GNSBlock) (err error) {
// assemble Namecache request
req := message.NewNamecacheCacheMsg(block)
// get response from Namecache service
_, err = service.RequestResponse(ctx, "zonemaster", "namecache", config.Cfg.Namecache.Service.Socket, req, false)
return
}
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