path: root/p2p/protocol_test.go

package p2p

import (
    "fmt"
    "net"
    "reflect"
    "testing"

    "github.com/ethereum/go-ethereum/crypto"
)

type peerId struct {
    pubkey []byte
}

func (self *peerId) String() string {
    return fmt.Sprintf("test peer %x", self.Pubkey()[:4])
}

func (self *peerId) Pubkey() (pubkey []byte) {
    pubkey = self.pubkey
    if len(pubkey) == 0 {
        pubkey = crypto.GenerateNewKeyPair().PublicKey
        self.pubkey = pubkey
    }
    return
}

func newTestPeer() (peer *Peer) {
    peer = NewPeer(&peerId{}, []Cap{})
    peer.pubkeyHook = func(*peerAddr) error { return nil }
    peer.ourID = &peerId{}
    peer.listenAddr = &peerAddr{}
    peer.otherPeers = func() []*Peer { return nil }
    return
}

func TestBaseProtocolPeers(t *testing.T) {
    cannedPeerList := []*peerAddr{
        {IP: net.ParseIP("1.2.3.4"), Port: 2222, Pubkey: []byte{}},
        {IP: net.ParseIP("5.6.7.8"), Port: 3333, Pubkey: []byte{}},
    }
    var ownAddr *peerAddr = &peerAddr{IP: net.ParseIP("1.3.5.7"), Port: 1111, Pubkey: []byte{}}
    rw1, rw2 := MsgPipe()
    // run matcher, close pipe when addresses have arrived
    addrChan := make(chan *peerAddr, len(cannedPeerList))
    go func() {
        for _, want := range cannedPeerList {
            got := <-addrChan
            t.Logf("got peer: %+v", got)
            if !reflect.DeepEqual(want, got) {
                t.Errorf("mismatch:  got %#v, want %#v", got, want)
            }
        }
        close(addrChan)
        var own []*peerAddr
        var got *peerAddr
        for got = range addrChan {
            own = append(own, got)
        }
        if len(own) != 1 || !reflect.DeepEqual(ownAddr, own[0]) {
            t.Errorf("mismatch: peers own address is incorrectly or not given, got %v, want %#v", ownAddr)
        }
        rw2.Close()
    }()
    // run first peer
    peer1 := newTestPeer()
    peer1.ourListenAddr = ownAddr
    peer1.otherPeers = func() []*Peer {
        pl := make([]*Peer, len(cannedPeerList))
        for i, addr := range cannedPeerList {
            pl[i] = &Peer{listenAddr: addr}
        }
        return pl
    }
    go runBaseProtocol(peer1, rw1)
    // run second peer
    peer2 := newTestPeer()
    peer2.newPeerAddr = addrChan // feed peer suggestions into matcher
    if err := runBaseProtocol(peer2, rw2); err != ErrPipeClosed {
        t.Errorf("peer2 terminated with unexpected error: %v", err)
    }
}

func TestBaseProtocolDisconnect(t *testing.T) {
    peer := NewPeer(&peerId{}, nil)
    peer.ourID = &peerId{}
    peer.pubkeyHook = func(*peerAddr) error { return nil }

    rw1, rw2 := MsgPipe()
    done := make(chan struct{})
    go func() {
        if err := expectMsg(rw2, handshakeMsg); err != nil {
            t.Error(err)
        }
        err := EncodeMsg(rw2, handshakeMsg,
            baseProtocolVersion,
            "",
            []interface{}{},
            0,
            make([]byte, 64),
        )
        if err != nil {
            t.Error(err)
        }
        if err := expectMsg(rw2, getPeersMsg); err != nil {
            t.Error(err)
        }
        if err := EncodeMsg(rw2, discMsg, DiscQuitting); err != nil {
            t.Error(err)
        }

        close(done)
    }()

    if err := runBaseProtocol(peer, rw1); err == nil {
        t.Errorf("base protocol returned without error")
    } else if reason, ok := err.(discRequestedError); !ok || reason != DiscQuitting {
        t.Errorf("base protocol returned wrong error: %v", err)
    }
    <-done
}

func expectMsg(r MsgReader, code uint64) error {
    msg, err := r.ReadMsg()
    if err != nil {
        return err
    }
    if err := msg.Discard(); err != nil {
        return err
    }
    if msg.Code != code {
        return fmt.Errorf("wrong message code: got %d, expected %d", msg.Code, code)
    }
    return nil
}