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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 revocation
import (
"context"
"fmt"
"io"
"gnunet/core"
"gnunet/message"
"gnunet/service"
"gnunet/transport"
"github.com/bfix/gospel/logger"
)
//----------------------------------------------------------------------
// "GNUnet Revocation" service implementation
//----------------------------------------------------------------------
// Service implements a revocation service
type Service struct {
Module
}
// NewService creates a new revocation service instance
func NewService(ctx context.Context, c *core.Core) service.Service {
// instantiate service
mod := NewModule(ctx, c)
srv := &Service{
Module: *mod,
}
srv.ProcessFcn = srv.HandleMessage
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, "[revocation:%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, "[revocation:%d:%d] Client channel closed.\n", id, reqID)
} else if err == service.ErrConnectionInterrupted {
logger.Printf(logger.INFO, "[revocation:%d:%d] Service operation interrupted.\n", id, reqID)
} else {
logger.Printf(logger.ERROR, "[revocation:%d:%d] Message-receive failed: %s\n", id, reqID, err.Error())
}
break
}
logger.Printf(logger.INFO, "[revocation:%d:%d] Received request: %v\n", id, reqID, msg)
// handle message
s.HandleMessage(context.WithValue(ctx, "label", fmt.Sprintf(":%d:%d", id, reqID)), msg, mc)
}
// close client connection
mc.Close()
// cancel all tasks running for this session/connection
logger.Printf(logger.INFO, "[revocation:%d] Start closing session...\n", id)
cancel()
}
// Handle a single incoming message
func (s *Service) HandleMessage(ctx context.Context, msg message.Message, back transport.Responder) bool {
// assemble log label
label := ""
if v := ctx.Value("label"); v != nil {
label = v.(string)
}
switch m := msg.(type) {
case *message.RevocationQueryMsg:
//----------------------------------------------------------
// REVOCATION_QUERY
//----------------------------------------------------------
go func(m *message.RevocationQueryMsg) {
logger.Printf(logger.INFO, "[revocation%s] Query request received.\n", label)
var resp *message.RevocationQueryResponseMsg
defer func() {
// send response
if resp != nil {
if err := back.Send(ctx, resp); err != nil {
logger.Printf(logger.ERROR, "[revocation%s] Failed to send response: %s\n", label, err.Error())
}
}
// go-routine finished
logger.Printf(logger.DBG, "[revocation%s] Query request finished.\n", label)
}()
valid, err := s.Query(ctx, m.Zone)
if err != nil {
logger.Printf(logger.ERROR, "[revocation%s] Failed to query revocation status: %s\n", label, err.Error())
if err == service.ErrConnectionInterrupted {
resp = nil
}
return
}
resp = message.NewRevocationQueryResponseMsg(valid)
}(m)
case *message.RevocationRevokeMsg:
//----------------------------------------------------------
// REVOCATION_REVOKE
//----------------------------------------------------------
go func(m *message.RevocationRevokeMsg) {
logger.Printf(logger.INFO, "[revocation%s] Revoke request received.\n", label)
var resp *message.RevocationRevokeResponseMsg
defer func() {
// send response
if resp != nil {
if err := back.Send(ctx, resp); err != nil {
logger.Printf(logger.ERROR, "[revocation%s] Failed to send response: %s\n", label, err.Error())
}
}
// go-routine finished
logger.Printf(logger.DBG, "[revocation%s] Revoke request finished.\n", label)
}()
rd := NewRevDataFromMsg(m)
valid, err := s.Revoke(ctx, rd)
if err != nil {
logger.Printf(logger.ERROR, "[revocation%s] Failed to revoke key: %s\n", label, err.Error())
if err == service.ErrConnectionInterrupted {
resp = nil
}
return
}
resp = message.NewRevocationRevokeResponseMsg(valid)
}(m)
default:
//----------------------------------------------------------
// UNKNOWN message type received
//----------------------------------------------------------
logger.Printf(logger.ERROR, "[revocation%s] Unhandled message of type (%d)\n", label, msg.Header().MsgType)
return false
}
return true
}
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