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interfaces.go
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interfaces.go
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// Copyright 2021 PairMesh, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package relay
import (
"crypto/rsa"
"time"
"github.com/flynn/noise"
"github.com/pairmesh/pairmesh/codec"
"github.com/pairmesh/pairmesh/message"
"github.com/pairmesh/pairmesh/protocol"
"google.golang.org/protobuf/proto"
"inet.af/netaddr"
)
type (
SessionCallback func(s *Session, typ message.PacketType, msg proto.Message) error
SessionHandler interface {
On(typ message.PacketType, cb SessionCallback)
Handle(s *Session, packet codec.RawPacket) error
}
ClientCallback func(s *Client, typ message.PacketType, msg proto.Message) error
ClientHandler interface {
On(typ message.PacketType, cb ClientCallback)
Handle(s *Client, packet codec.RawPacket) error
}
SessionLifetimeHook interface {
OnSessionHandshake(ses *Session)
OnSessionClosed(ses *Session)
}
SessionManager interface {
HeartbeatInterval() time.Duration
DHKey() noise.DHKey
RSAPublicKey() *rsa.PublicKey
Session(peerID protocol.PeerID) *Session
}
PeerRouter interface {
AddMERPPeerRoute(protocol.PeerID, string, *Client)
RemoveMERPPeerRoute(protocol.PeerID, string, *Client)
}
WriteRequest struct {
b []byte // copied; ownership passed to receiver
addr netaddr.IPPort
peerID protocol.PeerID
}
// ReadResult is the type sent by runMERPClient to receiveIPv4
// when a MERP packet is available.
ReadResult struct {
region string
n int // length of data received
src protocol.PeerID
// copyBuf is called to copy the data to dst. It returns how
// much data was copied, which will be n if dst is large
// enough. copyBuf can only be called once.
// If copyBuf is nil, that's a signal from the sender to ignore
// this message.
copyBuf func(dst []byte) int
}
)
// MaxPacketSize is the maximum size of a packet sent over MERP.
// (This only includes the data bytes visible to nicesock, not
// including its on-wire framing overhead)
const (
MaxPacketSize = 64 << 10
// ProtocolVersion is bumped whenever there's a wire-incompatible change.
// * version 1: received packets have src addrs in frameRecvPacket at beginning
ProtocolVersion = 1
keepAlive = 60 * time.Second
)