path: root/p2p/server_test.go

package p2p

import (
    "bytes"
    "crypto/ecdsa"
    "io"
    "math/rand"
    "net"
    "sync"
    "testing"
    "time"

    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/p2p/discover"
)

func startTestServer(t *testing.T, pf newPeerHook) *Server {
    server := &Server{
        Name:        "test",
        MaxPeers:    10,
        ListenAddr:  "127.0.0.1:0",
        PrivateKey:  newkey(),
        newPeerHook: pf,
        handshakeFunc: func(io.ReadWriter, *ecdsa.PrivateKey, *discover.Node) (id discover.NodeID, st []byte, err error) {
            return randomID(), nil, err
        },
    }
    if err := server.Start(); err != nil {
        t.Fatalf("Could not start server: %v", err)
    }
    return server
}

func TestServerListen(t *testing.T) {
    defer testlog(t).detach()

    // start the test server
    connected := make(chan *Peer)
    srv := startTestServer(t, func(p *Peer) {
        if p == nil {
            t.Error("peer func called with nil conn")
        }
        connected <- p
    })
    defer close(connected)
    defer srv.Stop()

    // dial the test server
    conn, err := net.DialTimeout("tcp", srv.ListenAddr, 5*time.Second)
    if err != nil {
        t.Fatalf("could not dial: %v", err)
    }
    defer conn.Close()

    select {
    case peer := <-connected:
        if peer.LocalAddr().String() != conn.RemoteAddr().String() {
            t.Errorf("peer started with wrong conn: got %v, want %v",
                peer.LocalAddr(), conn.RemoteAddr())
        }
    case <-time.After(1 * time.Second):
        t.Error("server did not accept within one second")
    }
}

func TestServerDial(t *testing.T) {
    defer testlog(t).detach()

    // run a one-shot TCP server to handle the connection.
    listener, err := net.Listen("tcp", "127.0.0.1:0")
    if err != nil {
        t.Fatalf("could not setup listener: %v")
    }
    defer listener.Close()
    accepted := make(chan net.Conn)
    go func() {
        conn, err := listener.Accept()
        if err != nil {
            t.Error("accept error:", err)
            return
        }
        conn.Close()
        accepted <- conn
    }()

    // start the server
    connected := make(chan *Peer)
    srv := startTestServer(t, func(p *Peer) { connected <- p })
    defer close(connected)
    defer srv.Stop()

    // tell the server to connect
    tcpAddr := listener.Addr().(*net.TCPAddr)
    srv.SuggestPeer(&discover.Node{IP: tcpAddr.IP, TCPPort: tcpAddr.Port})

    select {
    case conn := <-accepted:
        select {
        case peer := <-connected:
            if peer.RemoteAddr().String() != conn.LocalAddr().String() {
                t.Errorf("peer started with wrong conn: got %v, want %v",
                    peer.RemoteAddr(), conn.LocalAddr())
            }
            // TODO: validate more fields
        case <-time.After(1 * time.Second):
            t.Error("server did not launch peer within one second")
        }

    case <-time.After(1 * time.Second):
        t.Error("server did not connect within one second")
    }
}

func TestServerBroadcast(t *testing.T) {
    defer testlog(t).detach()

    var connected sync.WaitGroup
    srv := startTestServer(t, func(p *Peer) {
        p.protocols = []Protocol{discard}
        p.startSubprotocols([]Cap{discard.cap()})
        p.noHandshake = true
        connected.Done()
    })
    defer srv.Stop()

    // create a few peers
    var conns = make([]net.Conn, 8)
    connected.Add(len(conns))
    deadline := time.Now().Add(3 * time.Second)
    dialer := &net.Dialer{Deadline: deadline}
    for i := range conns {
        conn, err := dialer.Dial("tcp", srv.ListenAddr)
        if err != nil {
            t.Fatalf("conn %d: dial error: %v", i, err)
        }
        defer conn.Close()
        conn.SetDeadline(deadline)
        conns[i] = conn
    }
    connected.Wait()

    // broadcast one message
    srv.Broadcast("discard", 0, "foo")
    goldbuf := new(bytes.Buffer)
    writeMsg(goldbuf, NewMsg(16, "foo"))
    golden := goldbuf.Bytes()

    // check that the message has been written everywhere
    for i, conn := range conns {
        buf := make([]byte, len(golden))
        if _, err := io.ReadFull(conn, buf); err != nil {
            t.Errorf("conn %d: read error: %v", i, err)
        } else if !bytes.Equal(buf, golden) {
            t.Errorf("conn %d: msg mismatch\ngot:  %x\nwant: %x", i, buf, golden)
        }
    }
}

func newkey() *ecdsa.PrivateKey {
    key, err := crypto.GenerateKey()
    if err != nil {
        panic("couldn't generate key: " + err.Error())
    }
    return key
}

func randomID() (id discover.NodeID) {
    for i := range id {
        id[i] = byte(rand.Intn(255))
    }
    return id
}