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ltep_test.go
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ltep_test.go
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package torrent_test
import (
"math/rand"
"strconv"
"testing"
"github.com/anacrolix/sync"
qt "github.com/frankban/quicktest"
. "github.com/dannyzb/torrent"
"github.com/dannyzb/torrent/internal/testutil"
pp "github.com/dannyzb/torrent/peer_protocol"
)
const (
testRepliesToOddsExtensionName = "pm_me_odds"
testRepliesToEvensExtensionName = "pm_me_evens"
)
func countHandler(
c *qt.C,
wg *sync.WaitGroup,
// Name of the endpoint that this handler is for, for logging.
handlerName string,
// Whether we expect evens or odds
expectedMod2 uint,
// Extension name of messages we expect to handle.
answerToName pp.ExtensionName,
// Extension name of messages we expect to send.
replyToName pp.ExtensionName,
// Signal done when this value is seen.
doneValue uint,
) func(event PeerConnReadExtensionMessageEvent) {
return func(event PeerConnReadExtensionMessageEvent) {
// Read handshake, don't look it up.
if event.ExtensionNumber == 0 {
return
}
name, builtin, err := event.PeerConn.LocalLtepProtocolMap.LookupId(event.ExtensionNumber)
c.Assert(err, qt.IsNil)
// Not a user protocol.
if builtin {
return
}
switch name {
case answerToName:
u64, err := strconv.ParseUint(string(event.Payload), 10, 0)
c.Assert(err, qt.IsNil)
i := uint(u64)
c.Logf("%v got %d", handlerName, i)
if i == doneValue {
wg.Done()
return
}
c.Assert(i%2, qt.Equals, expectedMod2)
go func() {
c.Assert(
event.PeerConn.WriteExtendedMessage(
replyToName,
[]byte(strconv.FormatUint(uint64(i+1), 10))),
qt.IsNil)
}()
default:
c.Fatalf("got unexpected extension name %q", name)
}
}
}
func TestUserLtep(t *testing.T) {
c := qt.New(t)
var wg sync.WaitGroup
makeCfg := func() *ClientConfig {
cfg := TestingConfig(t)
// Only want a single connection to between the clients.
cfg.DisableUTP = true
cfg.DisableIPv6 = true
return cfg
}
evensCfg := makeCfg()
evensCfg.Callbacks.ReadExtendedHandshake = func(pc *PeerConn, msg *pp.ExtendedHandshakeMessage) {
// The client lock is held while handling this event, so we have to do synchronous work in a
// separate goroutine.
go func() {
// Check sending an extended message for a protocol the peer doesn't support is an error.
c.Check(pc.WriteExtendedMessage("pm_me_floats", []byte("3.142")), qt.IsNotNil)
// Kick things off by sending a 1.
c.Check(pc.WriteExtendedMessage(testRepliesToOddsExtensionName, []byte("1")), qt.IsNil)
}()
}
evensCfg.Callbacks.PeerConnReadExtensionMessage = append(
evensCfg.Callbacks.PeerConnReadExtensionMessage,
countHandler(c, &wg, "evens", 0, testRepliesToEvensExtensionName, testRepliesToOddsExtensionName, 100))
evensCfg.Callbacks.PeerConnAdded = append(evensCfg.Callbacks.PeerConnAdded, func(conn *PeerConn) {
conn.LocalLtepProtocolMap.AddUserProtocol(testRepliesToEvensExtensionName)
c.Assert(conn.LocalLtepProtocolMap.Index[conn.LocalLtepProtocolMap.NumBuiltin:], qt.HasLen, 1)
})
oddsCfg := makeCfg()
oddsCfg.Callbacks.PeerConnAdded = append(oddsCfg.Callbacks.PeerConnAdded, func(conn *PeerConn) {
conn.LocalLtepProtocolMap.AddUserProtocol(testRepliesToOddsExtensionName)
c.Assert(conn.LocalLtepProtocolMap.Index[conn.LocalLtepProtocolMap.NumBuiltin:], qt.HasLen, 1)
})
oddsCfg.Callbacks.PeerConnReadExtensionMessage = append(
oddsCfg.Callbacks.PeerConnReadExtensionMessage,
countHandler(c, &wg, "odds", 1, testRepliesToOddsExtensionName, testRepliesToEvensExtensionName, 100))
cl1, err := NewClient(oddsCfg)
c.Assert(err, qt.IsNil)
defer cl1.Close()
cl2, err := NewClient(evensCfg)
c.Assert(err, qt.IsNil)
defer cl2.Close()
addOpts := AddTorrentOpts{}
rand.Read(addOpts.InfoHash[:])
t1, _ := cl1.AddTorrentOpt(addOpts)
t2, _ := cl2.AddTorrentOpt(addOpts)
defer testutil.ExportStatusWriter(cl1, "cl1", t)()
defer testutil.ExportStatusWriter(cl2, "cl2", t)()
// Expect one PeerConn to see the value.
wg.Add(1)
added := t1.AddClientPeer(cl2)
// Ensure some addresses for the other client were added.
c.Assert(added, qt.Not(qt.Equals), 0)
wg.Wait()
_ = t2
}