88 lines
2.2 KiB
Go
88 lines
2.2 KiB
Go
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// Copyright 2023 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// go-ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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package ethtest
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import (
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"github.com/ethereum/go-ethereum/p2p"
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"github.com/ethereum/go-ethereum/rlp"
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)
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// Unexported devp2p message codes from p2p/peer.go.
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const (
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handshakeMsg = 0x00
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discMsg = 0x01
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pingMsg = 0x02
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pongMsg = 0x03
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)
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// Unexported devp2p protocol lengths from p2p package.
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const (
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baseProtoLen = 16
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ethProtoLen = 17
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snapProtoLen = 8
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)
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// Unexported handshake structure from p2p/peer.go.
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type protoHandshake struct {
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Version uint64
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Name string
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Caps []p2p.Cap
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ListenPort uint64
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ID []byte
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Rest []rlp.RawValue `rlp:"tail"`
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}
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type Hello = protoHandshake
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// Proto is an enum representing devp2p protocol types.
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type Proto int
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const (
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baseProto Proto = iota
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ethProto
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snapProto
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)
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// getProto returns the protocol a certain message code is associated with
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// (assuming the negotiated capabilities are exactly {eth,snap})
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func getProto(code uint64) Proto {
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switch {
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case code < baseProtoLen:
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return baseProto
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case code < baseProtoLen+ethProtoLen:
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return ethProto
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case code < baseProtoLen+ethProtoLen+snapProtoLen:
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return snapProto
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default:
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panic("unhandled msg code beyond last protocol")
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}
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}
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// protoOffset will return the offset at which the specified protocol's messages
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// begin.
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func protoOffset(proto Proto) uint64 {
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switch proto {
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case baseProto:
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return 0
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case ethProto:
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return baseProtoLen
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case snapProto:
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return baseProtoLen + ethProtoLen
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default:
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panic("unhandled protocol")
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}
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}
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