p2p/protocols, p2p/testing: protocol abstraction and testing
This commit is contained in:
zelig
311
p2p/protocols/protocol.go
Normal file
311
p2p/protocols/protocol.go
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@ -0,0 +1,311 @@
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// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
|
||||
// it under the terms of the GNU Lesser General Public License as published by
|
||||
// the Free Software Foundation, either version 3 of the License, or
|
||||
// (at your option) any later version.
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||||
//
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||||
// The go-ethereum library is distributed in the hope that it will be useful,
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||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU Lesser General Public License for more details.
|
||||
//
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||||
// You should have received a copy of the GNU Lesser General Public License
|
||||
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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/*
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Package protocols is an extension to p2p. It offers a user friendly simple way to define
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devp2p subprotocols by abstracting away code standardly shared by protocols.
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* automate assigments of code indexes to messages
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* automate RLP decoding/encoding based on reflecting
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* provide the forever loop to read incoming messages
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* standardise error handling related to communication
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* standardised handshake negotiation
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* TODO: automatic generation of wire protocol specification for peers
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*/
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package protocols
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import (
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"context"
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"fmt"
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"reflect"
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"sync"
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"github.com/ethereum/go-ethereum/p2p"
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)
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// error codes used by this protocol scheme
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const (
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ErrMsgTooLong = iota
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ErrDecode
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ErrWrite
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ErrInvalidMsgCode
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ErrInvalidMsgType
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ErrHandshake
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ErrNoHandler
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ErrHandler
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)
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// error description strings associated with the codes
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var errorToString = map[int]string{
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ErrMsgTooLong: "Message too long",
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ErrDecode: "Invalid message (RLP error)",
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ErrWrite: "Error sending message",
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ErrInvalidMsgCode: "Invalid message code",
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ErrInvalidMsgType: "Invalid message type",
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ErrHandshake: "Handshake error",
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ErrNoHandler: "No handler registered error",
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ErrHandler: "Message handler error",
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}
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/*
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Error implements the standard go error interface.
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Use:
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errorf(code, format, params ...interface{})
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Prints as:
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<description>: <details>
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where description is given by code in errorToString
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and details is fmt.Sprintf(format, params...)
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exported field Code can be checked
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*/
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type Error struct {
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Code int
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message string
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format string
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params []interface{}
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}
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func (e Error) Error() (message string) {
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if len(e.message) == 0 {
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name, ok := errorToString[e.Code]
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if !ok {
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panic("invalid message code")
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}
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e.message = name
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if e.format != "" {
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e.message += ": " + fmt.Sprintf(e.format, e.params...)
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}
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}
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return e.message
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}
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func errorf(code int, format string, params ...interface{}) *Error {
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return &Error{
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Code: code,
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format: format,
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params: params,
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}
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}
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// Spec is a protocol specification including its name and version as well as
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// the types of messages which are exchanged
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type Spec struct {
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// Name is the name of the protocol, often a three-letter word
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Name string
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// Version is the version number of the protocol
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Version uint
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// MaxMsgSize is the maximum accepted length of the message payload
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MaxMsgSize uint32
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// Messages is a list of message data types which this protocol uses, with
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// each message type being sent with its array index as the code (so
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// [&foo{}, &bar{}, &baz{}] would send foo, bar and baz with codes
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// 0, 1 and 2 respectively)
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// each message must have a single unique data type
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Messages []interface{}
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initOnce sync.Once
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codes map[reflect.Type]uint64
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types map[uint64]reflect.Type
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}
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func (s *Spec) init() {
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s.initOnce.Do(func() {
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s.codes = make(map[reflect.Type]uint64, len(s.Messages))
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s.types = make(map[uint64]reflect.Type, len(s.Messages))
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for i, msg := range s.Messages {
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code := uint64(i)
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typ := reflect.TypeOf(msg)
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if typ.Kind() == reflect.Ptr {
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typ = typ.Elem()
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}
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s.codes[typ] = code
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s.types[code] = typ
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}
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})
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}
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// Length returns the number of message types in the protocol
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func (s *Spec) Length() uint64 {
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return uint64(len(s.Messages))
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}
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// GetCode returns the message code of a type, and boolean second argument is
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// false if the message type is not found
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func (s *Spec) GetCode(msg interface{}) (uint64, bool) {
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s.init()
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typ := reflect.TypeOf(msg)
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if typ.Kind() == reflect.Ptr {
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typ = typ.Elem()
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}
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code, ok := s.codes[typ]
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return code, ok
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}
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// NewMsg construct a new message type given the code
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func (s *Spec) NewMsg(code uint64) (interface{}, bool) {
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s.init()
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typ, ok := s.types[code]
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if !ok {
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return nil, false
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}
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return reflect.New(typ).Interface(), true
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}
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// Peer represents a remote peer or protocol instance that is running on a peer connection with
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// a remote peer
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type Peer struct {
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*p2p.Peer // the p2p.Peer object representing the remote
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rw p2p.MsgReadWriter // p2p.MsgReadWriter to send messages to and read messages from
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spec *Spec
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}
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// NewPeer constructs a new peer
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// this constructor is called by the p2p.Protocol#Run function
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// the first two arguments are the arguments passed to p2p.Protocol.Run function
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// the third argument is the Spec describing the protocol
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func NewPeer(p *p2p.Peer, rw p2p.MsgReadWriter, spec *Spec) *Peer {
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return &Peer{
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Peer: p,
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rw: rw,
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spec: spec,
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}
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}
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// Run starts the forever loop that handles incoming messages
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// called within the p2p.Protocol#Run function
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// the handler argument is a function which is called for each message received
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// from the remote peer, a returned error causes the loop to exit
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// resulting in disconnection
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func (p *Peer) Run(handler func(msg interface{}) error) error {
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for {
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if err := p.handleIncoming(handler); err != nil {
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return err
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}
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}
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}
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// Drop disconnects a peer.
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// TODO: may need to implement protocol drop only? don't want to kick off the peer
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// if they are useful for other protocols
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func (p *Peer) Drop(err error) {
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p.Disconnect(p2p.DiscSubprotocolError)
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}
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// Send takes a message, encodes it in RLP, finds the right message code and sends the
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// message off to the peer
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// this low level call will be wrapped by libraries providing routed or broadcast sends
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// but often just used to forward and push messages to directly connected peers
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func (p *Peer) Send(msg interface{}) error {
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code, found := p.spec.GetCode(msg)
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if !found {
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return errorf(ErrInvalidMsgType, "%v", code)
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}
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return p2p.Send(p.rw, code, msg)
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}
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// handleIncoming(code)
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// is called each cycle of the main forever loop that dispatches incoming messages
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// if this returns an error the loop returns and the peer is disconnected with the error
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// this generic handler
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// * checks message size,
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// * checks for out-of-range message codes,
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// * handles decoding with reflection,
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// * call handlers as callbacks
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func (p *Peer) handleIncoming(handle func(msg interface{}) error) error {
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msg, err := p.rw.ReadMsg()
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if err != nil {
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return err
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}
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// make sure that the payload has been fully consumed
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defer msg.Discard()
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if msg.Size > p.spec.MaxMsgSize {
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return errorf(ErrMsgTooLong, "%v > %v", msg.Size, p.spec.MaxMsgSize)
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}
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val, ok := p.spec.NewMsg(msg.Code)
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if !ok {
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return errorf(ErrInvalidMsgCode, "%v", msg.Code)
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}
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if err := msg.Decode(val); err != nil {
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return errorf(ErrDecode, "<= %v: %v", msg, err)
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}
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// call the registered handler callbacks
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// a registered callback take the decoded message as argument as an interface
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// which the handler is supposed to cast to the appropriate type
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// it is entirely safe not to check the cast in the handler since the handler is
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// chosen based on the proper type in the first place
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if err := handle(val); err != nil {
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return errorf(ErrHandler, "(msg code %v): %v", msg.Code, err)
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}
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return nil
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}
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// Handshake negotiates a handshake on the peer connection
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// * arguments
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// * context
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// * the local handshake to be sent to the remote peer
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// * funcion to be called on the remote handshake (can be nil)
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// * expects a remote handshake back of the same type
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// * the dialing peer needs to send the handshake first and then waits for remote
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// * the listening peer waits for the remote handshake and then sends it
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// returns the remote handshake and an error
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func (p *Peer) Handshake(ctx context.Context, hs interface{}, verify func(interface{}) error) (rhs interface{}, err error) {
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if _, ok := p.spec.GetCode(hs); !ok {
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return nil, errorf(ErrHandshake, "unknown handshake message type: %T", hs)
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}
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errc := make(chan error, 2)
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handle := func(msg interface{}) error {
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rhs = msg
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if verify != nil {
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return verify(rhs)
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}
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return nil
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}
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send := func() { errc <- p.Send(hs) }
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receive := func() { errc <- p.handleIncoming(handle) }
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go func() {
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if p.Inbound() {
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receive()
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send()
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} else {
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send()
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receive()
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}
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}()
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for i := 0; i < 2; i++ {
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select {
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case err = <-errc:
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case <-ctx.Done():
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err = ctx.Err()
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}
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if err != nil {
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return nil, errorf(ErrHandshake, err.Error())
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}
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}
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return rhs, nil
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}
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389
p2p/protocols/protocol_test.go
Normal file
389
p2p/protocols/protocol_test.go
Normal file
@ -0,0 +1,389 @@
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// Copyright 2017 The go-ethereum Authors
|
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// This file is part of the go-ethereum library.
|
||||
//
|
||||
// The go-ethereum library is free software: you can redistribute it and/or modify
|
||||
// it under the terms of the GNU Lesser General Public License as published by
|
||||
// the Free Software Foundation, either version 3 of the License, or
|
||||
// (at your option) any later version.
|
||||
//
|
||||
// The go-ethereum library 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 Lesser General Public License for more details.
|
||||
//
|
||||
// You should have received a copy of the GNU Lesser General Public License
|
||||
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
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package protocols
|
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|
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import (
|
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"context"
|
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"errors"
|
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"fmt"
|
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"testing"
|
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"time"
|
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|
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"github.com/ethereum/go-ethereum/p2p"
|
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"github.com/ethereum/go-ethereum/p2p/discover"
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"github.com/ethereum/go-ethereum/p2p/simulations/adapters"
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p2ptest "github.com/ethereum/go-ethereum/p2p/testing"
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)
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// handshake message type
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type hs0 struct {
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C uint
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}
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// message to kill/drop the peer with nodeID
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type kill struct {
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C discover.NodeID
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}
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// message to drop connection
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type drop struct {
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}
|
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/// protoHandshake represents module-independent aspects of the protocol and is
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// the first message peers send and receive as part the initial exchange
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type protoHandshake struct {
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Version uint // local and remote peer should have identical version
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NetworkID string // local and remote peer should have identical network id
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}
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// checkProtoHandshake verifies local and remote protoHandshakes match
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func checkProtoHandshake(testVersion uint, testNetworkID string) func(interface{}) error {
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return func(rhs interface{}) error {
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remote := rhs.(*protoHandshake)
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if remote.NetworkID != testNetworkID {
|
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return fmt.Errorf("%s (!= %s)", remote.NetworkID, testNetworkID)
|
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}
|
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|
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if remote.Version != testVersion {
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return fmt.Errorf("%d (!= %d)", remote.Version, testVersion)
|
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}
|
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return nil
|
||||
}
|
||||
}
|
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|
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// newProtocol sets up a protocol
|
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// the run function here demonstrates a typical protocol using peerPool, handshake
|
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// and messages registered to handlers
|
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func newProtocol(pp *p2ptest.TestPeerPool) func(*p2p.Peer, p2p.MsgReadWriter) error {
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spec := &Spec{
|
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Name: "test",
|
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Version: 42,
|
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MaxMsgSize: 10 * 1024,
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Messages: []interface{}{
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protoHandshake{},
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hs0{},
|
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kill{},
|
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drop{},
|
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},
|
||||
}
|
||||
return func(p *p2p.Peer, rw p2p.MsgReadWriter) error {
|
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peer := NewPeer(p, rw, spec)
|
||||
|
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// initiate one-off protohandshake and check validity
|
||||
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
|
||||
defer cancel()
|
||||
phs := &protoHandshake{42, "420"}
|
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hsCheck := checkProtoHandshake(phs.Version, phs.NetworkID)
|
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_, err := peer.Handshake(ctx, phs, hsCheck)
|
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if err != nil {
|
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return err
|
||||
}
|
||||
|
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lhs := &hs0{42}
|
||||
// module handshake demonstrating a simple repeatable exchange of same-type message
|
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hs, err := peer.Handshake(ctx, lhs, nil)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if rmhs := hs.(*hs0); rmhs.C > lhs.C {
|
||||
return fmt.Errorf("handshake mismatch remote %v > local %v", rmhs.C, lhs.C)
|
||||
}
|
||||
|
||||
handle := func(msg interface{}) error {
|
||||
switch msg := msg.(type) {
|
||||
|
||||
case *protoHandshake:
|
||||
return errors.New("duplicate handshake")
|
||||
|
||||
case *hs0:
|
||||
rhs := msg
|
||||
if rhs.C > lhs.C {
|
||||
return fmt.Errorf("handshake mismatch remote %v > local %v", rhs.C, lhs.C)
|
||||
}
|
||||
lhs.C += rhs.C
|
||||
return peer.Send(lhs)
|
||||
|
||||
case *kill:
|
||||
// demonstrates use of peerPool, killing another peer connection as a response to a message
|
||||
id := msg.C
|
||||
pp.Get(id).Drop(errors.New("killed"))
|
||||
return nil
|
||||
|
||||
case *drop:
|
||||
// for testing we can trigger self induced disconnect upon receiving drop message
|
||||
return errors.New("dropped")
|
||||
|
||||
default:
|
||||
return fmt.Errorf("unknown message type: %T", msg)
|
||||
}
|
||||
}
|
||||
|
||||
pp.Add(peer)
|
||||
defer pp.Remove(peer)
|
||||
return peer.Run(handle)
|
||||
}
|
||||
}
|
||||
|
||||
func protocolTester(t *testing.T, pp *p2ptest.TestPeerPool) *p2ptest.ProtocolTester {
|
||||
conf := adapters.RandomNodeConfig()
|
||||
return p2ptest.NewProtocolTester(t, conf.ID, 2, newProtocol(pp))
|
||||
}
|
||||
|
||||
func protoHandshakeExchange(id discover.NodeID, proto *protoHandshake) []p2ptest.Exchange {
|
||||
|
||||
return []p2ptest.Exchange{
|
||||
p2ptest.Exchange{
|
||||
Expects: []p2ptest.Expect{
|
||||
p2ptest.Expect{
|
||||
Code: 0,
|
||||
Msg: &protoHandshake{42, "420"},
|
||||
Peer: id,
|
||||
},
|
||||
},
|
||||
},
|
||||
p2ptest.Exchange{
|
||||
Triggers: []p2ptest.Trigger{
|
||||
p2ptest.Trigger{
|
||||
Code: 0,
|
||||
Msg: proto,
|
||||
Peer: id,
|
||||
},
|
||||
},
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
func runProtoHandshake(t *testing.T, proto *protoHandshake, errs ...error) {
|
||||
pp := p2ptest.NewTestPeerPool()
|
||||
s := protocolTester(t, pp)
|
||||
// TODO: make this more than one handshake
|
||||
id := s.IDs[0]
|
||||
if err := s.TestExchanges(protoHandshakeExchange(id, proto)...); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
var disconnects []*p2ptest.Disconnect
|
||||
for i, err := range errs {
|
||||
disconnects = append(disconnects, &p2ptest.Disconnect{Peer: s.IDs[i], Error: err})
|
||||
}
|
||||
if err := s.TestDisconnected(disconnects...); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
}
|
||||
|
||||
func TestProtoHandshakeVersionMismatch(t *testing.T) {
|
||||
runProtoHandshake(t, &protoHandshake{41, "420"}, errorf(ErrHandshake, errorf(ErrHandler, "(msg code 0): 41 (!= 42)").Error()))
|
||||
}
|
||||
|
||||
func TestProtoHandshakeNetworkIDMismatch(t *testing.T) {
|
||||
runProtoHandshake(t, &protoHandshake{42, "421"}, errorf(ErrHandshake, errorf(ErrHandler, "(msg code 0): 421 (!= 420)").Error()))
|
||||
}
|
||||
|
||||
func TestProtoHandshakeSuccess(t *testing.T) {
|
||||
runProtoHandshake(t, &protoHandshake{42, "420"})
|
||||
}
|
||||
|
||||
func moduleHandshakeExchange(id discover.NodeID, resp uint) []p2ptest.Exchange {
|
||||
|
||||
return []p2ptest.Exchange{
|
||||
p2ptest.Exchange{
|
||||
Expects: []p2ptest.Expect{
|
||||
p2ptest.Expect{
|
||||
Code: 1,
|
||||
Msg: &hs0{42},
|
||||
Peer: id,
|
||||
},
|
||||
},
|
||||
},
|
||||
p2ptest.Exchange{
|
||||
Triggers: []p2ptest.Trigger{
|
||||
p2ptest.Trigger{
|
||||
Code: 1,
|
||||
Msg: &hs0{resp},
|
||||
Peer: id,
|
||||
},
|
||||
},
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
func runModuleHandshake(t *testing.T, resp uint, errs ...error) {
|
||||
pp := p2ptest.NewTestPeerPool()
|
||||
s := protocolTester(t, pp)
|
||||
id := s.IDs[0]
|
||||
if err := s.TestExchanges(protoHandshakeExchange(id, &protoHandshake{42, "420"})...); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if err := s.TestExchanges(moduleHandshakeExchange(id, resp)...); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
var disconnects []*p2ptest.Disconnect
|
||||
for i, err := range errs {
|
||||
disconnects = append(disconnects, &p2ptest.Disconnect{Peer: s.IDs[i], Error: err})
|
||||
}
|
||||
if err := s.TestDisconnected(disconnects...); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
}
|
||||
|
||||
func TestModuleHandshakeError(t *testing.T) {
|
||||
runModuleHandshake(t, 43, fmt.Errorf("handshake mismatch remote 43 > local 42"))
|
||||
}
|
||||
|
||||
func TestModuleHandshakeSuccess(t *testing.T) {
|
||||
runModuleHandshake(t, 42)
|
||||
}
|
||||
|
||||
// testing complex interactions over multiple peers, relaying, dropping
|
||||
func testMultiPeerSetup(a, b discover.NodeID) []p2ptest.Exchange {
|
||||
|
||||
return []p2ptest.Exchange{
|
||||
p2ptest.Exchange{
|
||||
Label: "primary handshake",
|
||||
Expects: []p2ptest.Expect{
|
||||
p2ptest.Expect{
|
||||
Code: 0,
|
||||
Msg: &protoHandshake{42, "420"},
|
||||
Peer: a,
|
||||
},
|
||||
p2ptest.Expect{
|
||||
Code: 0,
|
||||
Msg: &protoHandshake{42, "420"},
|
||||
Peer: b,
|
||||
},
|
||||
},
|
||||
},
|
||||
p2ptest.Exchange{
|
||||
Label: "module handshake",
|
||||
Triggers: []p2ptest.Trigger{
|
||||
p2ptest.Trigger{
|
||||
Code: 0,
|
||||
Msg: &protoHandshake{42, "420"},
|
||||
Peer: a,
|
||||
},
|
||||
p2ptest.Trigger{
|
||||
Code: 0,
|
||||
Msg: &protoHandshake{42, "420"},
|
||||
Peer: b,
|
||||
},
|
||||
},
|
||||
Expects: []p2ptest.Expect{
|
||||
p2ptest.Expect{
|
||||
Code: 1,
|
||||
Msg: &hs0{42},
|
||||
Peer: a,
|
||||
},
|
||||
p2ptest.Expect{
|
||||
Code: 1,
|
||||
Msg: &hs0{42},
|
||||
Peer: b,
|
||||
},
|
||||
},
|
||||
},
|
||||
|
||||
p2ptest.Exchange{Label: "alternative module handshake", Triggers: []p2ptest.Trigger{p2ptest.Trigger{Code: 1, Msg: &hs0{41}, Peer: a},
|
||||
p2ptest.Trigger{Code: 1, Msg: &hs0{41}, Peer: b}}},
|
||||
p2ptest.Exchange{Label: "repeated module handshake", Triggers: []p2ptest.Trigger{p2ptest.Trigger{Code: 1, Msg: &hs0{1}, Peer: a}}},
|
||||
p2ptest.Exchange{Label: "receiving repeated module handshake", Expects: []p2ptest.Expect{p2ptest.Expect{Code: 1, Msg: &hs0{43}, Peer: a}}}}
|
||||
}
|
||||
|
||||
func runMultiplePeers(t *testing.T, peer int, errs ...error) {
|
||||
pp := p2ptest.NewTestPeerPool()
|
||||
s := protocolTester(t, pp)
|
||||
|
||||
if err := s.TestExchanges(testMultiPeerSetup(s.IDs[0], s.IDs[1])...); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
// after some exchanges of messages, we can test state changes
|
||||
// here this is simply demonstrated by the peerPool
|
||||
// after the handshake negotiations peers must be added to the pool
|
||||
// time.Sleep(1)
|
||||
tick := time.NewTicker(10 * time.Millisecond)
|
||||
timeout := time.NewTimer(1 * time.Second)
|
||||
WAIT:
|
||||
for {
|
||||
select {
|
||||
case <-tick.C:
|
||||
if pp.Has(s.IDs[0]) {
|
||||
break WAIT
|
||||
}
|
||||
case <-timeout.C:
|
||||
t.Fatal("timeout")
|
||||
}
|
||||
}
|
||||
if !pp.Has(s.IDs[1]) {
|
||||
t.Fatalf("missing peer test-1: %v (%v)", pp, s.IDs)
|
||||
}
|
||||
|
||||
// peer 0 sends kill request for peer with index <peer>
|
||||
err := s.TestExchanges(p2ptest.Exchange{
|
||||
Triggers: []p2ptest.Trigger{
|
||||
p2ptest.Trigger{
|
||||
Code: 2,
|
||||
Msg: &kill{s.IDs[peer]},
|
||||
Peer: s.IDs[0],
|
||||
},
|
||||
},
|
||||
})
|
||||
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
// the peer not killed sends a drop request
|
||||
err = s.TestExchanges(p2ptest.Exchange{
|
||||
Triggers: []p2ptest.Trigger{
|
||||
p2ptest.Trigger{
|
||||
Code: 3,
|
||||
Msg: &drop{},
|
||||
Peer: s.IDs[(peer+1)%2],
|
||||
},
|
||||
},
|
||||
})
|
||||
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
// check the actual discconnect errors on the individual peers
|
||||
var disconnects []*p2ptest.Disconnect
|
||||
for i, err := range errs {
|
||||
disconnects = append(disconnects, &p2ptest.Disconnect{Peer: s.IDs[i], Error: err})
|
||||
}
|
||||
if err := s.TestDisconnected(disconnects...); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
// test if disconnected peers have been removed from peerPool
|
||||
if pp.Has(s.IDs[peer]) {
|
||||
t.Fatalf("peer test-%v not dropped: %v (%v)", peer, pp, s.IDs)
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
func TestMultiplePeersDropSelf(t *testing.T) {
|
||||
runMultiplePeers(t, 0,
|
||||
fmt.Errorf("subprotocol error"),
|
||||
fmt.Errorf("Message handler error: (msg code 3): dropped"),
|
||||
)
|
||||
}
|
||||
|
||||
func TestMultiplePeersDropOther(t *testing.T) {
|
||||
runMultiplePeers(t, 1,
|
||||
fmt.Errorf("Message handler error: (msg code 3): dropped"),
|
||||
fmt.Errorf("subprotocol error"),
|
||||
)
|
||||
}
|
||||
Reference in New Issue
Block a user