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Merge pull request #1341 from karalabe/proto-version-negotiation

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p2p: support protocol version negotiation
This commit is contained in:
Felix Lange 2015-06-28 13:52:37 +02:00
commit a0191910fc
3 changed files with 110 additions and 6 deletions
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11
p2p/peer.go
View File

@ -249,15 +249,22 @@ func countMatchingProtocols(protocols []Protocol, caps []Cap) int {
// matchProtocols creates structures for matching named subprotocols.
func matchProtocols(protocols []Protocol, caps []Cap, rw MsgReadWriter) map[string]*protoRW {
sort.Sort(capsByName(caps))
sort.Sort(capsByNameAndVersion(caps))
offset := baseProtocolLength
result := make(map[string]*protoRW)
outer:
for _, cap := range caps {
for _, proto := range protocols {
if proto.Name == cap.Name && proto.Version == cap.Version && result[cap.Name] == nil {
if proto.Name == cap.Name && proto.Version == cap.Version {
// If an old protocol version matched, revert it
if old := result[cap.Name]; old != nil {
offset -= old.Length
}
// Assign the new match
result[cap.Name] = &protoRW{Protocol: proto, offset: offset, in: make(chan Msg), w: rw}
offset += proto.Length
continue outer
}
}

95
p2p/peer_test.go
View File

@ -196,3 +196,98 @@ func TestNewPeer(t *testing.T) {
p.Disconnect(DiscAlreadyConnected) // Should not hang
}
func TestMatchProtocols(t *testing.T) {
tests := []struct {
Remote []Cap
Local []Protocol
Match map[string]protoRW
}{
{
// No remote capabilities
Local: []Protocol{{Name: "a"}},
},
{
// No local protocols
Remote: []Cap{{Name: "a"}},
},
{
// No mutual protocols
Remote: []Cap{{Name: "a"}},
Local: []Protocol{{Name: "b"}},
},
{
// Some matches, some differences
Remote: []Cap{{Name: "local"}, {Name: "match1"}, {Name: "match2"}},
Local: []Protocol{{Name: "match1"}, {Name: "match2"}, {Name: "remote"}},
Match: map[string]protoRW{"match1": {Protocol: Protocol{Name: "match1"}}, "match2": {Protocol: Protocol{Name: "match2"}}},
},
{
// Various alphabetical ordering
Remote: []Cap{{Name: "aa"}, {Name: "ab"}, {Name: "bb"}, {Name: "ba"}},
Local: []Protocol{{Name: "ba"}, {Name: "bb"}, {Name: "ab"}, {Name: "aa"}},
Match: map[string]protoRW{"aa": {Protocol: Protocol{Name: "aa"}}, "ab": {Protocol: Protocol{Name: "ab"}}, "ba": {Protocol: Protocol{Name: "ba"}}, "bb": {Protocol: Protocol{Name: "bb"}}},
},
{
// No mutual versions
Remote: []Cap{{Version: 1}},
Local: []Protocol{{Version: 2}},
},
{
// Multiple versions, single common
Remote: []Cap{{Version: 1}, {Version: 2}},
Local: []Protocol{{Version: 2}, {Version: 3}},
Match: map[string]protoRW{"": {Protocol: Protocol{Version: 2}}},
},
{
// Multiple versions, multiple common
Remote: []Cap{{Version: 1}, {Version: 2}, {Version: 3}, {Version: 4}},
Local: []Protocol{{Version: 2}, {Version: 3}},
Match: map[string]protoRW{"": {Protocol: Protocol{Version: 3}}},
},
{
// Various version orderings
Remote: []Cap{{Version: 4}, {Version: 1}, {Version: 3}, {Version: 2}},
Local: []Protocol{{Version: 2}, {Version: 3}, {Version: 1}},
Match: map[string]protoRW{"": {Protocol: Protocol{Version: 3}}},
},
{
// Versions overriding sub-protocol lengths
Remote: []Cap{{Version: 1}, {Version: 2}, {Version: 3}, {Name: "a"}},
Local: []Protocol{{Version: 1, Length: 1}, {Version: 2, Length: 2}, {Version: 3, Length: 3}, {Name: "a"}},
Match: map[string]protoRW{"": {Protocol: Protocol{Version: 3}}, "a": {Protocol: Protocol{Name: "a"}, offset: 3}},
},
}
for i, tt := range tests {
result := matchProtocols(tt.Local, tt.Remote, nil)
if len(result) != len(tt.Match) {
t.Errorf("test %d: negotiation mismatch: have %v, want %v", i, len(result), len(tt.Match))
continue
}
// Make sure all negotiated protocols are needed and correct
for name, proto := range result {
match, ok := tt.Match[name]
if !ok {
t.Errorf("test %d, proto '%s': negotiated but shouldn't have", i, name)
continue
}
if proto.Name != match.Name {
t.Errorf("test %d, proto '%s': name mismatch: have %v, want %v", i, name, proto.Name, match.Name)
}
if proto.Version != match.Version {
t.Errorf("test %d, proto '%s': version mismatch: have %v, want %v", i, name, proto.Version, match.Version)
}
if proto.offset-baseProtocolLength != match.offset {
t.Errorf("test %d, proto '%s': offset mismatch: have %v, want %v", i, name, proto.offset-baseProtocolLength, match.offset)
}
}
// Make sure no protocols missed negotiation
for name, _ := range tt.Match {
if _, ok := result[name]; !ok {
t.Errorf("test %d, proto '%s': not negotiated, should have", i, name)
continue
}
}
}
}

10
p2p/protocol.go
View File

@ -43,8 +43,10 @@ func (cap Cap) String() string {
return fmt.Sprintf("%s/%d", cap.Name, cap.Version)
}
type capsByName []Cap
type capsByNameAndVersion []Cap
func (cs capsByName) Len() int { return len(cs) }
func (cs capsByName) Less(i, j int) bool { return cs[i].Name < cs[j].Name }
func (cs capsByName) Swap(i, j int) { cs[i], cs[j] = cs[j], cs[i] }
func (cs capsByNameAndVersion) Len() int { return len(cs) }
func (cs capsByNameAndVersion) Swap(i, j int) { cs[i], cs[j] = cs[j], cs[i] }
func (cs capsByNameAndVersion) Less(i, j int) bool {
return cs[i].Name < cs[j].Name || (cs[i].Name == cs[j].Name && cs[i].Version < cs[j].Version)
}