New Cluster Configuration message replaces Options (fixes #63)

cmd/stcli/main.go

@@ -61,7 +61,7 @@ func connect(target string) {
 
 	remoteID := certID(conn.ConnectionState().PeerCertificates[0].Raw)
 
-	pc = protocol.NewConnection(remoteID, conn, conn, Model{}, nil)
+	pc = protocol.NewConnection(remoteID, conn, conn, Model{})
 
 	select {}
 }
@@ -127,6 +127,11 @@ func (m Model) IndexUpdate(nodeID string, repo string, files []protocol.FileInfo
 	}
 }
 
+func (m Model) ClusterConfig(nodeID string, config protocol.ClusterConfigMessage) {
+	log.Println("Received cluster config")
+	log.Printf("%#v", config)
+}
+
 func (m Model) Request(nodeID, repo string, name string, offset int64, size int) ([]byte, error) {
 	log.Println("Received request")
 	return nil, io.EOF

cmd/syncthing/config.go

@@ -1,9 +1,7 @@
 package main
 
 import (
-	"crypto/sha256"
 	"encoding/xml"
-	"fmt"
 	"io"
 	"reflect"
 	"sort"
@@ -231,15 +229,6 @@ func (l NodeConfigurationList) Len() int {
 	return len(l)
 }
 
-func clusterHash(nodes []NodeConfiguration) string {
-	sort.Sort(NodeConfigurationList(nodes))
-	h := sha256.New()
-	for _, n := range nodes {
-		h.Write([]byte(n.NodeID))
-	}
-	return fmt.Sprintf("%x", h.Sum(nil))
-}
-
 func cleanNodeList(nodes []NodeConfiguration, myID string) []NodeConfiguration {
 	var myIDExists bool
 	for _, node := range nodes {

cmd/syncthing/main.go

@@ -219,15 +219,9 @@ func main() {
 	m.ScanRepos()
 	m.SaveIndexes(confDir)
 
-	connOpts := map[string]string{
-		"clientId":      "syncthing",
-		"clientVersion": Version,
-		"clusterHash":   clusterHash(cfg.Repositories[0].Nodes),
-	}
-
 	// Routine to connect out to configured nodes
 	disc := discovery()
-	go listenConnect(myID, disc, m, tlsCfg, connOpts)
+	go listenConnect(myID, disc, m, tlsCfg)
 
 	for _, repo := range cfg.Repositories {
 		// Routine to pull blocks from other nodes to synchronize the local
@@ -325,7 +319,7 @@ func saveConfig() {
 	saveConfigCh <- struct{}{}
 }
 
-func listenConnect(myID string, disc *discover.Discoverer, m *Model, tlsCfg *tls.Config, connOpts map[string]string) {
+func listenConnect(myID string, disc *discover.Discoverer, m *Model, tlsCfg *tls.Config) {
 	var conns = make(chan *tls.Conn)
 
 	// Listen
@@ -438,7 +432,7 @@ next:
 				if rateBucket != nil {
 					wr = &limitedWriter{conn, rateBucket}
 				}
-				protoConn := protocol.NewConnection(remoteID, conn, wr, m, connOpts)
+				protoConn := protocol.NewConnection(remoteID, conn, wr, m)
 				m.AddConnection(conn, protoConn)
 				continue next
 			}

cmd/syncthing/model.go

@@ -31,6 +31,7 @@ type Model struct {
 
 	protoConn map[string]protocol.Connection
 	rawConn   map[string]io.Closer
+	nodeVer   map[string]string
 	pmut      sync.RWMutex // protects protoConn and rawConn
 
 	sup suppressor
@@ -56,6 +57,7 @@ func NewModel(maxChangeBw int) *Model {
 		cm:        cid.NewMap(),
 		protoConn: make(map[string]protocol.Connection),
 		rawConn:   make(map[string]io.Closer),
+		nodeVer:   make(map[string]string),
 		sup:       suppressor{threshold: int64(maxChangeBw)},
 	}
 
@@ -87,7 +89,6 @@ func (m *Model) StartRepoRO(repo string) {
 type ConnectionInfo struct {
 	protocol.Statistics
 	Address       string
-	ClientID      string
 	ClientVersion string
 	Completion    int
 }
@@ -105,8 +106,7 @@ func (m *Model) ConnectionStats() map[string]ConnectionInfo {
 	for node, conn := range m.protoConn {
 		ci := ConnectionInfo{
 			Statistics:    conn.Statistics(),
-			ClientID:      conn.Option("clientId"),
-			ClientVersion: conn.Option("clientVersion"),
+			ClientVersion: m.nodeVer[node],
 		}
 		if nc, ok := m.rawConn[node].(remoteAddrer); ok {
 			ci.Address = nc.RemoteAddr().String()
@@ -245,15 +245,37 @@ func (m *Model) IndexUpdate(nodeID string, repo string, fs []protocol.FileInfo)
 	m.rmut.RUnlock()
 }
 
+func (m *Model) ClusterConfig(nodeID string, config protocol.ClusterConfigMessage) {
+	compErr := compareClusterConfig(m.clusterConfig(nodeID), config)
+	if debugNet {
+		dlog.Printf("ClusterConfig: %s: %#v", nodeID, config)
+		dlog.Printf("  ... compare: %s: %v", nodeID, compErr)
+	}
+
+	if compErr != nil {
+		warnf("%s: %v", nodeID, compErr)
+		m.Close(nodeID, compErr)
+	}
+
+	m.pmut.Lock()
+	if config.ClientName == "syncthing" {
+		m.nodeVer[nodeID] = config.ClientVersion
+	} else {
+		m.nodeVer[nodeID] = config.ClientName + " " + config.ClientVersion
+	}
+	m.pmut.Unlock()
+}
+
 // Close removes the peer from the model and closes the underlying connection if possible.
 // Implements the protocol.Model interface.
 func (m *Model) Close(node string, err error) {
 	if debugNet {
 		dlog.Printf("%s: %v", node, err)
 	}
-	if err == protocol.ErrClusterHash {
-		warnf("Connection to %s closed due to mismatched cluster hash. Ensure that the configured cluster members are identical on both nodes.", node)
-	} else if err != io.EOF {
+
+	if err != io.EOF {
+		warnf("Connection to %s closed: %v", node, err)
+	} else if _, ok := err.(ClusterConfigMismatch); ok {
 		warnf("Connection to %s closed: %v", node, err)
 	}
 
@@ -272,6 +294,7 @@ func (m *Model) Close(node string, err error) {
 	}
 	delete(m.protoConn, node)
 	delete(m.rawConn, node)
+	delete(m.nodeVer, node)
 	m.pmut.Unlock()
 }
 
@@ -386,6 +409,9 @@ func (m *Model) AddConnection(rawConn io.Closer, protoConn protocol.Connection)
 	m.rawConn[nodeID] = rawConn
 	m.pmut.Unlock()
 
+	cm := m.clusterConfig(nodeID)
+	protoConn.ClusterConfig(cm)
+
 	go func() {
 		m.rmut.RLock()
 		repos := m.nodeRepos[nodeID]
@@ -596,46 +622,28 @@ func (m *Model) loadIndex(repo string, dir string) []protocol.FileInfo {
 	return im.Files
 }
 
-func fileFromFileInfo(f protocol.FileInfo) scanner.File {
-	var blocks = make([]scanner.Block, len(f.Blocks))
-	var offset int64
-	for i, b := range f.Blocks {
-		blocks[i] = scanner.Block{
-			Offset: offset,
-			Size:   b.Size,
-			Hash:   b.Hash,
+// clusterConfig returns a ClusterConfigMessage that is correct for the given peer node
+func (m *Model) clusterConfig(node string) protocol.ClusterConfigMessage {
+	cm := protocol.ClusterConfigMessage{
+		ClientName:    "syncthing",
+		ClientVersion: Version,
+	}
+
+	m.rmut.Lock()
+	for _, repo := range m.nodeRepos[node] {
+		cr := protocol.Repository{
+			ID: repo,
 		}
-		offset += int64(b.Size)
-	}
-	return scanner.File{
-		// Name is with native separator and normalization
-		Name:       filepath.FromSlash(f.Name),
-		Size:       offset,
-		Flags:      f.Flags &^ protocol.FlagInvalid,
-		Modified:   f.Modified,
-		Version:    f.Version,
-		Blocks:     blocks,
-		Suppressed: f.Flags&protocol.FlagInvalid != 0,
-	}
-}
-
-func fileInfoFromFile(f scanner.File) protocol.FileInfo {
-	var blocks = make([]protocol.BlockInfo, len(f.Blocks))
-	for i, b := range f.Blocks {
-		blocks[i] = protocol.BlockInfo{
-			Size: b.Size,
-			Hash: b.Hash,
+		for _, node := range m.repoNodes[repo] {
+			// TODO: Set read only bit when relevant
+			cr.Nodes = append(cr.Nodes, protocol.Node{
+				ID:    node,
+				Flags: protocol.FlagShareTrusted,
+			})
 		}
+		cm.Repositories = append(cm.Repositories, cr)
 	}
-	pf := protocol.FileInfo{
-		Name:     filepath.ToSlash(f.Name),
-		Flags:    f.Flags,
-		Modified: f.Modified,
-		Version:  f.Version,
-		Blocks:   blocks,
-	}
-	if f.Suppressed {
-		pf.Flags |= protocol.FlagInvalid
-	}
-	return pf
+	m.rmut.Unlock()
+
+	return cm
 }

cmd/syncthing/model_test.go

@@ -170,6 +170,8 @@ func (f FakeConnection) Request(repo, name string, offset int64, size int) ([]by
 	return f.requestData, nil
 }
 
+func (FakeConnection) ClusterConfig(protocol.ClusterConfigMessage) {}
+
 func (FakeConnection) Ping() bool {
 	return true
 }

cmd/syncthing/util.go

@@ -3,7 +3,11 @@ package main
 import (
 	"fmt"
 	"os"
+	"path/filepath"
 	"runtime"
+
+	"github.com/calmh/syncthing/protocol"
+	"github.com/calmh/syncthing/scanner"
 )
 
 func MetricPrefix(n int64) string {
@@ -41,3 +45,99 @@ func Rename(from, to string) error {
 	}
 	return os.Rename(from, to)
 }
+
+func fileFromFileInfo(f protocol.FileInfo) scanner.File {
+	var blocks = make([]scanner.Block, len(f.Blocks))
+	var offset int64
+	for i, b := range f.Blocks {
+		blocks[i] = scanner.Block{
+			Offset: offset,
+			Size:   b.Size,
+			Hash:   b.Hash,
+		}
+		offset += int64(b.Size)
+	}
+	return scanner.File{
+		// Name is with native separator and normalization
+		Name:       filepath.FromSlash(f.Name),
+		Size:       offset,
+		Flags:      f.Flags &^ protocol.FlagInvalid,
+		Modified:   f.Modified,
+		Version:    f.Version,
+		Blocks:     blocks,
+		Suppressed: f.Flags&protocol.FlagInvalid != 0,
+	}
+}
+
+func fileInfoFromFile(f scanner.File) protocol.FileInfo {
+	var blocks = make([]protocol.BlockInfo, len(f.Blocks))
+	for i, b := range f.Blocks {
+		blocks[i] = protocol.BlockInfo{
+			Size: b.Size,
+			Hash: b.Hash,
+		}
+	}
+	pf := protocol.FileInfo{
+		Name:     filepath.ToSlash(f.Name),
+		Flags:    f.Flags,
+		Modified: f.Modified,
+		Version:  f.Version,
+		Blocks:   blocks,
+	}
+	if f.Suppressed {
+		pf.Flags |= protocol.FlagInvalid
+	}
+	return pf
+}
+
+func cmMap(cm protocol.ClusterConfigMessage) map[string]map[string]uint32 {
+	m := make(map[string]map[string]uint32)
+	for _, repo := range cm.Repositories {
+		m[repo.ID] = make(map[string]uint32)
+		for _, node := range repo.Nodes {
+			m[repo.ID][node.ID] = node.Flags
+		}
+	}
+	return m
+}
+
+type ClusterConfigMismatch error
+
+// compareClusterConfig returns nil for two equivalent configurations,
+// otherwise a decriptive error
+func compareClusterConfig(local, remote protocol.ClusterConfigMessage) error {
+	lm := cmMap(local)
+	rm := cmMap(remote)
+
+	for repo, lnodes := range lm {
+		_ = lnodes
+		if rnodes, ok := rm[repo]; ok {
+			for node, lflags := range lnodes {
+				if rflags, ok := rnodes[node]; ok {
+					if lflags&protocol.FlagShareBits != rflags&protocol.FlagShareBits {
+						return ClusterConfigMismatch(fmt.Errorf("remote has different sharing flags for node %q in repository %q", node, repo))
+					}
+				} else {
+					return ClusterConfigMismatch(fmt.Errorf("remote is missing node %q in repository %q", node, repo))
+				}
+			}
+		} else {
+			return ClusterConfigMismatch(fmt.Errorf("remote is missing repository %q", repo))
+		}
+	}
+
+	for repo, rnodes := range rm {
+		if lnodes, ok := lm[repo]; ok {
+			for node := range rnodes {
+				if _, ok := lnodes[node]; !ok {
+					return ClusterConfigMismatch(fmt.Errorf("remote has extra node %q in repository %q", node, repo))
+				}
+			}
+		} else {
+			return ClusterConfigMismatch(fmt.Errorf("remote has extra repository %q", repo))
+		}
+
+	}
+
+	return nil
+}

cmd/syncthing/util_test.go

@@ -0,0 +1,183 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/calmh/syncthing/protocol"
+)
+
+var testcases = []struct {
+	local, remote protocol.ClusterConfigMessage
+	err           string
+}{
+	{
+		local:  protocol.ClusterConfigMessage{},
+		remote: protocol.ClusterConfigMessage{},
+		err:    "",
+	},
+	{
+		local:  protocol.ClusterConfigMessage{ClientName: "a", ClientVersion: "b"},
+		remote: protocol.ClusterConfigMessage{ClientName: "c", ClientVersion: "d"},
+		err:    "",
+	},
+	{
+		local: protocol.ClusterConfigMessage{
+			Repositories: []protocol.Repository{
+				{ID: "foo"},
+			},
+		},
+		remote: protocol.ClusterConfigMessage{ClientName: "c", ClientVersion: "d"},
+		err:    `remote is missing repository "foo"`,
+	},
+	{
+		local: protocol.ClusterConfigMessage{ClientName: "c", ClientVersion: "d"},
+		remote: protocol.ClusterConfigMessage{
+			Repositories: []protocol.Repository{
+				{ID: "foo"},
+			},
+		},
+		err: `remote has extra repository "foo"`,
+	},
+	{
+		local: protocol.ClusterConfigMessage{
+			Repositories: []protocol.Repository{
+				{ID: "foo"},
+				{ID: "bar"},
+			},
+		},
+		remote: protocol.ClusterConfigMessage{
+			Repositories: []protocol.Repository{
+				{ID: "foo"},
+				{ID: "bar"},
+			},
+		},
+		err: "",
+	},
+	{
+		local: protocol.ClusterConfigMessage{
+			Repositories: []protocol.Repository{
+				{ID: "quux"},
+				{ID: "foo"},
+				{ID: "bar"},
+			},
+		},
+		remote: protocol.ClusterConfigMessage{
+			Repositories: []protocol.Repository{
+				{ID: "bar"},
+				{ID: "quux"},
+			},
+		},
+		err: `remote is missing repository "foo"`,
+	},
+	{
+		local: protocol.ClusterConfigMessage{
+			Repositories: []protocol.Repository{
+				{ID: "quux"},
+				{ID: "bar"},
+			},
+		},
+		remote: protocol.ClusterConfigMessage{
+			Repositories: []protocol.Repository{
+				{ID: "bar"},
+				{ID: "foo"},
+				{ID: "quux"},
+			},
+		},
+		err: `remote has extra repository "foo"`,
+	},
+	{
+		local: protocol.ClusterConfigMessage{
+			Repositories: []protocol.Repository{
+				{
+					ID: "foo",
+					Nodes: []protocol.Node{
+						{ID: "a"},
+					},
+				},
+				{ID: "bar"},
+			},
+		},
+		remote: protocol.ClusterConfigMessage{
+			Repositories: []protocol.Repository{
+				{ID: "foo"},
+				{ID: "bar"},
+			},
+		},
+		err: `remote is missing node "a" in repository "foo"`,
+	},
+
+	{
+		local: protocol.ClusterConfigMessage{
+			Repositories: []protocol.Repository{
+				{
+					ID: "foo",
+					Nodes: []protocol.Node{
+						{ID: "a"},
+					},
+				},
+				{ID: "bar"},
+			},
+		},
+		remote: protocol.ClusterConfigMessage{
+			Repositories: []protocol.Repository{
+				{
+					ID: "foo",
+					Nodes: []protocol.Node{
+						{ID: "a"},
+						{ID: "b"},
+					},
+				},
+				{ID: "bar"},
+			},
+		},
+		err: `remote has extra node "b" in repository "foo"`,
+	},
+
+	{
+		local: protocol.ClusterConfigMessage{
+			Repositories: []protocol.Repository{
+				{
+					ID: "foo",
+					Nodes: []protocol.Node{
+						{
+							ID:    "a",
+							Flags: protocol.FlagShareReadOnly,
+						},
+					},
+				},
+				{ID: "bar"},
+			},
+		},
+		remote: protocol.ClusterConfigMessage{
+			Repositories: []protocol.Repository{
+				{
+					ID: "foo",
+					Nodes: []protocol.Node{
+						{
+							ID:    "a",
+							Flags: protocol.FlagShareTrusted,
+						},
+					},
+				},
+				{ID: "bar"},
+			},
+		},
+		err: `remote has different sharing flags for node "a" in repository "foo"`,
+	},
+}
+
+func TestCompareClusterConfig(t *testing.T) {
+	for i, tc := range testcases {
+		err := compareClusterConfig(tc.local, tc.remote)
+		switch {
+		case tc.err == "" && err != nil:
+			t.Errorf("#%d: unexpected error: %v", i, err)
+
+		case tc.err != "" && err == nil:
+			t.Errorf("#%d: unexpected nil error", i)
+
+		case tc.err != "" && err != nil && tc.err != err.Error():
+			t.Errorf("#%d: incorrect error: %q != %q", i, err, tc.err)
+		}
+	}
+}

protocol/PROTOCOL.md

@@ -79,10 +79,14 @@ version, type and ID.
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 
 For BEP v1 the Version field is set to zero. Future versions with
-incompatible message formats will increment the Version field.
+incompatible message formats will increment the Version field. A message
+with an unknown version is a protocol error and MUST result in the
+connection being terminated. A client supporting multiple versions MAY
+retry with a different protcol version upon disconnection.
 
 The Type field indicates the type of data following the message header
-and is one of the integers defined below.
+and is one of the integers defined below. A message of an unknown type
+is a protocol error and MUST result in the connection being terminated.
 
 The Message ID is set to a unique value for each transmitted message. In
 request messages the Reply To is set to zero. In response messages it is
@@ -110,6 +114,183 @@ Opaque data should not be interpreted but can be compared bytewise to
 other opaque data. All strings MUST use the Unicode UTF-8 encoding,
 normalization form C.
 
+### Cluster Config (Type = 0)
+
+This informational message provides information about the cluster
+configuration, as it pertains to the current connection. It is sent by
+both sides after connection establishment.
+
+#### Graphical Representation
+
+    ClusterConfigMessage Structure:
+
+     0                   1                   2                   3
+     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    |                     Length of ClientName                      |
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    /                                                               /
+    \                 ClientName (variable length)                  \
+    /                                                               /
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    |                    Length of ClientVersion                    |
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    /                                                               /
+    \                ClientVersion (variable length)                \
+    /                                                               /
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    |                    Number of Repositories                     |
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    /                                                               /
+    \              Zero or more Repository Structures               \
+    /                                                               /
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    |                       Number of Options                       |
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    /                                                               /
+    \                Zero or more Option Structures                 \
+    /                                                               /
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+
+    Repository Structure:
+
+     0                   1                   2                   3
+     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    |                         Length of ID                          |
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    /                                                               /
+    \                     ID (variable length)                      \
+    /                                                               /
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    |                        Number of Nodes                        |
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    /                                                               /
+    \                 Zero or more Node Structures                  \
+    /                                                               /
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+
+    Node Structure:
+
+     0                   1                   2                   3
+     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    |                         Length of ID                          |
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    /                                                               /
+    \                     ID (variable length)                      \
+    /                                                               /
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    |                             Flags                             |
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+
+    Option Structure:
+
+     0                   1                   2                   3
+     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    |                         Length of Key                         |
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    /                                                               /
+    \                     Key (variable length)                     \
+    /                                                               /
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    |                        Length of Value                        |
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    /                                                               /
+    \                    Value (variable length)                    \
+    /                                                               /
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+#### Fields
+
+The ClientName and ClientVersion fields identify the implementation. The
+values SHOULD be simple strings identifying the implementation name, as
+a user would expect to see it, and the version string in the same
+manner. An example ClientName is "syncthing" and an example
+ClientVersion is "v0.7.2". The ClientVersion field SHOULD follow the
+patterns laid out in the [Semantic Versioning](http://semver.org/)
+standard.
+
+The Repositories field lists all repositories that will be synchronized
+over the current connection. Each repository has a list of participating
+Nodes. Each node has an associated Flags field to indicate the sharing
+mode of that node for the repository in question. See the discussion on
+Sharing Modes.
+
+The Node Flags field contains the following single bit flags:
+
+     0                   1                   2                   3
+     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+    |          Reserved         |Pri|          Reserved         |R|T|
+    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ - Bit 31 ("T", Trusted) is set for nodes that participate in trusted
+   mode.
+
+ - Bit 30 ("R", Read Only) is set for nodes that participate in read
+   only mode.
+
+ - Bits 16 through 28 are reserved and MUST be set to zero.
+
+ - Bits 14-15 ("Pri) indicate the node's upload priority for this
+   repository. Possible values are:
+
+    - 00: The default. Normal priority.
+
+    - 01: High priority. Other nodes SHOULD favour requesting files from
+      this node over nodes with normal or low priority.
+
+    - 10: Low priority. Other nodes SHOULD avoid requesting files from
+      this node when they are available from other nodes.
+
+    - 11: Sharing disabled. Other nodes SHOULD NOT request files from
+      this node.
+
+ - Bits 0 through 14 are reserved and MUST be set to zero.
+
+Exactly one of the T, R or S bits MUST be set.
+
+The Options field contain option values to be used in an implementation
+specific manner. The options list is conceptually a map of Key => Value
+items, although it is transmitted in the form of a list of (Key, Value)
+pairs, both of string type. Key ID:s are implementation specific. An
+implementation MUST ignore unknown keys. An implementation MAY impose
+limits on the length keys and values. The options list may be used to
+inform nodes of relevant local configuration options such as rate
+limiting or make recommendations about request parallellism, node
+priorities, etc. An empty options list is valid for nodes not having any
+such information to share. Nodes MAY NOT make any assumptions about
+peers acting in a specific manner as a result of sent options.
+
+#### XDR
+
+    struct ClusterConfigMessage {
+        string ClientName<>;
+        string ClientVersion<>;
+        Repository Repositories<>;
+        Option Options<>;
+    }
+
+    struct Repository {
+        string ID<>;
+        Node Nodes<>;
+    }
+
+    struct Node {
+        string ID<>;
+        unsigned int Flags;
+    }
+
+    struct Option {
+        string Key<>;
+        string Value<>;
+    }
+
 ### Index (Type = 1)
 
 The Index message defines the contents of the senders repository. An
@@ -356,65 +537,32 @@ model, the Index Update merely amends it with new or updated file
 information. Any files not mentioned in an Index Update are left
 unchanged.
 
-### Options (Type = 7)
+Sharing Modes
+-------------
 
-This informational message provides information about the client
-configuration, version, etc. It is sent at connection initiation and,
-optionally, when any of the sent parameters have changed. The message is
-in the form of a list of (key, value) pairs, both of string type.
+### Trusted
 
-Key ID:s apart from the well known ones are implementation specific. An
-implementation is expected to ignore unknown keys. An implementation may
-impose limits on key and value size.
+Trusted mode is the default sharing mode. Updates are exchanged in both
+directions.
 
-Well known keys:
+    +------------+     Updates      /---------\
+    |            |  ----------->   /           \
+    |    Node    |                 |  Cluster  |
+    |            |  <-----------   \           /
+    +------------+     Updates      \---------/
 
-  - "clientId" -- The name of the implementation. Example: "syncthing".
+### Read Only
 
-  - "clientVersion" -- The version of the client. Example: "v1.0.33-47".
-    The Following the SemVer 2.0 specification for version strings is
-    encouraged but not enforced.
+In read only mode a node does not synchronize the local repository to
+the cluster, but publishes changes to it's local repository contents as
+usual. The local repository can be seen as a "master copy" that is never
+affected by the actions of other cluster nodes.
 
-#### Graphical Representation
-
-     0                   1                   2                   3
-     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
-    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-    |                       Number of Options                       |
-    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-    /                                                               /
-    \               Zero or more KeyValue Structures                \
-    /                                                               /
-    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-
-    KeyValue Structure:
-
-     0                   1                   2                   3
-     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
-    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-    |                         Length of Key                         |
-    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-    /                                                               /
-    \                     Key (variable length)                     \
-    /                                                               /
-    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-    |                        Length of Value                        |
-    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-    /                                                               /
-    \                    Value (variable length)                    \
-    /                                                               /
-    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-
-#### XDR
-
-    struct OptionsMessage {
-        KeyValue Options<>;
-    }
-
-    struct KeyValue {
-        string Key<>;
-        string Value<>;
-    }
+    +------------+     Updates      /---------\
+    |            |  ----------->   /           \
+    |    Node    |                 |  Cluster  |
+    |            |                 \           /
+    +------------+                  \---------/
 
 Message Limits
 --------------

protocol/common_test.go

@@ -38,6 +38,9 @@ func (t *TestModel) Close(nodeID string, err error) {
 	close(t.closedCh)
 }
 
+func (t *TestModel) ClusterConfig(nodeID string, config ClusterConfigMessage) {
+}
+
 func (t *TestModel) isClosed() bool {
 	select {
 	case <-t.closedCh:

protocol/message_types.go

@@ -25,8 +25,21 @@ type RequestMessage struct {
 	Size       uint32
 }
 
-type OptionsMessage struct {
-	Options []Option // max:64
+type ClusterConfigMessage struct {
+	ClientName    string       // max:64
+	ClientVersion string       // max:64
+	Repositories  []Repository // max:64
+	Options       []Option     // max:64
+}
+
+type Repository struct {
+	ID    string // max:64
+	Nodes []Node // max:64
+}
+
+type Node struct {
+	ID    string // max:64
+	Flags uint32
 }
 
 type Option struct {

protocol/message_xdr.go

@@ -198,19 +198,34 @@ func (o *RequestMessage) decodeXDR(xr *xdr.Reader) error {
 	return xr.Error()
 }
 
-func (o OptionsMessage) EncodeXDR(w io.Writer) (int, error) {
+func (o ClusterConfigMessage) EncodeXDR(w io.Writer) (int, error) {
 	var xw = xdr.NewWriter(w)
 	return o.encodeXDR(xw)
 }
 
-func (o OptionsMessage) MarshalXDR() []byte {
+func (o ClusterConfigMessage) MarshalXDR() []byte {
 	var buf bytes.Buffer
 	var xw = xdr.NewWriter(&buf)
 	o.encodeXDR(xw)
 	return buf.Bytes()
 }
 
-func (o OptionsMessage) encodeXDR(xw *xdr.Writer) (int, error) {
+func (o ClusterConfigMessage) encodeXDR(xw *xdr.Writer) (int, error) {
+	if len(o.ClientName) > 64 {
+		return xw.Tot(), xdr.ErrElementSizeExceeded
+	}
+	xw.WriteString(o.ClientName)
+	if len(o.ClientVersion) > 64 {
+		return xw.Tot(), xdr.ErrElementSizeExceeded
+	}
+	xw.WriteString(o.ClientVersion)
+	if len(o.Repositories) > 64 {
+		return xw.Tot(), xdr.ErrElementSizeExceeded
+	}
+	xw.WriteUint32(uint32(len(o.Repositories)))
+	for i := range o.Repositories {
+		o.Repositories[i].encodeXDR(xw)
+	}
 	if len(o.Options) > 64 {
 		return xw.Tot(), xdr.ErrElementSizeExceeded
 	}
@@ -221,18 +236,28 @@ func (o OptionsMessage) encodeXDR(xw *xdr.Writer) (int, error) {
 	return xw.Tot(), xw.Error()
 }
 
-func (o *OptionsMessage) DecodeXDR(r io.Reader) error {
+func (o *ClusterConfigMessage) DecodeXDR(r io.Reader) error {
 	xr := xdr.NewReader(r)
 	return o.decodeXDR(xr)
 }
 
-func (o *OptionsMessage) UnmarshalXDR(bs []byte) error {
+func (o *ClusterConfigMessage) UnmarshalXDR(bs []byte) error {
 	var buf = bytes.NewBuffer(bs)
 	var xr = xdr.NewReader(buf)
 	return o.decodeXDR(xr)
 }
 
-func (o *OptionsMessage) decodeXDR(xr *xdr.Reader) error {
+func (o *ClusterConfigMessage) decodeXDR(xr *xdr.Reader) error {
+	o.ClientName = xr.ReadStringMax(64)
+	o.ClientVersion = xr.ReadStringMax(64)
+	_RepositoriesSize := int(xr.ReadUint32())
+	if _RepositoriesSize > 64 {
+		return xdr.ErrElementSizeExceeded
+	}
+	o.Repositories = make([]Repository, _RepositoriesSize)
+	for i := range o.Repositories {
+		(&o.Repositories[i]).decodeXDR(xr)
+	}
 	_OptionsSize := int(xr.ReadUint32())
 	if _OptionsSize > 64 {
 		return xdr.ErrElementSizeExceeded
@@ -244,6 +269,95 @@ func (o *OptionsMessage) decodeXDR(xr *xdr.Reader) error {
 	return xr.Error()
 }
 
+func (o Repository) EncodeXDR(w io.Writer) (int, error) {
+	var xw = xdr.NewWriter(w)
+	return o.encodeXDR(xw)
+}
+
+func (o Repository) MarshalXDR() []byte {
+	var buf bytes.Buffer
+	var xw = xdr.NewWriter(&buf)
+	o.encodeXDR(xw)
+	return buf.Bytes()
+}
+
+func (o Repository) encodeXDR(xw *xdr.Writer) (int, error) {
+	if len(o.ID) > 64 {
+		return xw.Tot(), xdr.ErrElementSizeExceeded
+	}
+	xw.WriteString(o.ID)
+	if len(o.Nodes) > 64 {
+		return xw.Tot(), xdr.ErrElementSizeExceeded
+	}
+	xw.WriteUint32(uint32(len(o.Nodes)))
+	for i := range o.Nodes {
+		o.Nodes[i].encodeXDR(xw)
+	}
+	return xw.Tot(), xw.Error()
+}
+
+func (o *Repository) DecodeXDR(r io.Reader) error {
+	xr := xdr.NewReader(r)
+	return o.decodeXDR(xr)
+}
+
+func (o *Repository) UnmarshalXDR(bs []byte) error {
+	var buf = bytes.NewBuffer(bs)
+	var xr = xdr.NewReader(buf)
+	return o.decodeXDR(xr)
+}
+
+func (o *Repository) decodeXDR(xr *xdr.Reader) error {
+	o.ID = xr.ReadStringMax(64)
+	_NodesSize := int(xr.ReadUint32())
+	if _NodesSize > 64 {
+		return xdr.ErrElementSizeExceeded
+	}
+	o.Nodes = make([]Node, _NodesSize)
+	for i := range o.Nodes {
+		(&o.Nodes[i]).decodeXDR(xr)
+	}
+	return xr.Error()
+}
+
+func (o Node) EncodeXDR(w io.Writer) (int, error) {
+	var xw = xdr.NewWriter(w)
+	return o.encodeXDR(xw)
+}
+
+func (o Node) MarshalXDR() []byte {
+	var buf bytes.Buffer
+	var xw = xdr.NewWriter(&buf)
+	o.encodeXDR(xw)
+	return buf.Bytes()
+}
+
+func (o Node) encodeXDR(xw *xdr.Writer) (int, error) {
+	if len(o.ID) > 64 {
+		return xw.Tot(), xdr.ErrElementSizeExceeded
+	}
+	xw.WriteString(o.ID)
+	xw.WriteUint32(o.Flags)
+	return xw.Tot(), xw.Error()
+}
+
+func (o *Node) DecodeXDR(r io.Reader) error {
+	xr := xdr.NewReader(r)
+	return o.decodeXDR(xr)
+}
+
+func (o *Node) UnmarshalXDR(bs []byte) error {
+	var buf = bytes.NewBuffer(bs)
+	var xr = xdr.NewReader(buf)
+	return o.decodeXDR(xr)
+}
+
+func (o *Node) decodeXDR(xr *xdr.Reader) error {
+	o.ID = xr.ReadStringMax(64)
+	o.Flags = xr.ReadUint32()
+	return xr.Error()
+}
+
 func (o Option) EncodeXDR(w io.Writer) (int, error) {
 	var xw = xdr.NewWriter(w)
 	return o.encodeXDR(xw)

protocol/nativemodel_darwin.go

@@ -29,6 +29,10 @@ func (m nativeModel) Request(nodeID, repo string, name string, offset int64, siz
 	return m.next.Request(nodeID, repo, name, offset, size)
 }
 
+func (m nativeModel) ClusterConfig(nodeID string, config ClusterConfigMessage) {
+	m.next.ClusterConfig(nodeID, config)
+}
+
 func (m nativeModel) Close(nodeID string, err error) {
 	m.next.Close(nodeID, err)
 }

protocol/nativemodel_unix.go

@@ -20,6 +20,10 @@ func (m nativeModel) Request(nodeID, repo string, name string, offset int64, siz
 	return m.next.Request(nodeID, repo, name, offset, size)
 }
 
+func (m nativeModel) ClusterConfig(nodeID string, config ClusterConfigMessage) {
+	m.next.ClusterConfig(nodeID, config)
+}
+
 func (m nativeModel) Close(nodeID string, err error) {
 	m.next.Close(nodeID, err)
 }

protocol/nativemodel_windows.go

@@ -29,6 +29,10 @@ func (m nativeModel) Request(nodeID, repo string, name string, offset int64, siz
 	return m.next.Request(nodeID, repo, name, offset, size)
 }
 
+func (m nativeModel) ClusterConfig(nodeID string, config ClusterConfigMessage) {
+	m.next.ClusterConfig(nodeID, config)
+}
+
 func (m nativeModel) Close(nodeID string, err error) {
 	m.next.Close(nodeID, err)
 }

protocol/protocol.go

@@ -6,7 +6,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"log"
 	"sync"
 	"time"
 
@@ -17,13 +16,13 @@ import (
 const BlockSize = 128 * 1024
 
 const (
-	messageTypeIndex       = 1
-	messageTypeRequest     = 2
-	messageTypeResponse    = 3
-	messageTypePing        = 4
-	messageTypePong        = 5
-	messageTypeIndexUpdate = 6
-	messageTypeOptions     = 7
+	messageTypeClusterConfig = 0
+	messageTypeIndex         = 1
+	messageTypeRequest       = 2
+	messageTypeResponse      = 3
+	messageTypePing          = 4
+	messageTypePong          = 5
+	messageTypeIndexUpdate   = 6
 )
 
 const (
@@ -32,6 +31,12 @@ const (
 	FlagDirectory        = 1 << 14
 )
 
+const (
+	FlagShareTrusted  uint32 = 1 << 0
+	FlagShareReadOnly        = 1 << 1
+	FlagShareBits            = 0x000000ff
+)
+
 var (
 	ErrClusterHash = fmt.Errorf("configuration error: mismatched cluster hash")
 	ErrClosed      = errors.New("connection closed")
@@ -44,6 +49,8 @@ type Model interface {
 	IndexUpdate(nodeID string, repo string, files []FileInfo)
 	// A request was made by the peer node
 	Request(nodeID string, repo string, name string, offset int64, size int) ([]byte, error)
+	// A cluster configuration message was received
+	ClusterConfig(nodeID string, config ClusterConfigMessage)
 	// The peer node closed the connection
 	Close(nodeID string, err error)
 }
@@ -52,27 +59,24 @@ type Connection interface {
 	ID() string
 	Index(repo string, files []FileInfo)
 	Request(repo string, name string, offset int64, size int) ([]byte, error)
+	ClusterConfig(config ClusterConfigMessage)
 	Statistics() Statistics
-	Option(key string) string
 }
 
 type rawConnection struct {
 	sync.RWMutex
 
-	id          string
-	receiver    Model
-	reader      io.ReadCloser
-	xr          *xdr.Reader
-	writer      io.WriteCloser
-	wb          *bufio.Writer
-	xw          *xdr.Writer
-	closed      chan struct{}
-	awaiting    map[int]chan asyncResult
-	nextID      int
-	indexSent   map[string]map[string][2]int64
-	peerOptions map[string]string
-	myOptions   map[string]string
-	optionsLock sync.Mutex
+	id        string
+	receiver  Model
+	reader    io.ReadCloser
+	xr        *xdr.Reader
+	writer    io.WriteCloser
+	wb        *bufio.Writer
+	xw        *xdr.Writer
+	closed    chan struct{}
+	awaiting  map[int]chan asyncResult
+	nextID    int
+	indexSent map[string]map[string][2]int64
 
 	hasSentIndex  bool
 	hasRecvdIndex bool
@@ -88,7 +92,7 @@ const (
 	pingIdleTime = 5 * time.Minute
 )
 
-func NewConnection(nodeID string, reader io.Reader, writer io.Writer, receiver Model, options map[string]string) Connection {
+func NewConnection(nodeID string, reader io.Reader, writer io.Writer, receiver Model) Connection {
 	flrd := flate.NewReader(reader)
 	flwr, err := flate.NewWriter(writer, flate.BestSpeed)
 	if err != nil {
@@ -112,28 +116,6 @@ func NewConnection(nodeID string, reader io.Reader, writer io.Writer, receiver M
 	go c.readerLoop()
 	go c.pingerLoop()
 
-	if options != nil {
-		c.myOptions = options
-		go func() {
-			c.Lock()
-			header{0, c.nextID, messageTypeOptions}.encodeXDR(c.xw)
-			var om OptionsMessage
-			for k, v := range options {
-				om.Options = append(om.Options, Option{k, v})
-			}
-			om.encodeXDR(c.xw)
-			err := c.xw.Error()
-			if err == nil {
-				err = c.flush()
-			}
-			if err != nil {
-				log.Println("Warning: Write error during initial handshake:", err)
-			}
-			c.nextID++
-			c.Unlock()
-		}()
-	}
-
 	return wireFormatConnection{&c}
 }
 
@@ -217,6 +199,27 @@ func (c *rawConnection) Request(repo string, name string, offset int64, size int
 	return res.val, res.err
 }
 
+// ClusterConfig send the cluster configuration message to the peer and returns any error
+func (c *rawConnection) ClusterConfig(config ClusterConfigMessage) {
+	c.Lock()
+	defer c.Unlock()
+
+	if c.isClosed() {
+		return
+	}
+
+	header{0, c.nextID, messageTypeClusterConfig}.encodeXDR(c.xw)
+	c.nextID = (c.nextID + 1) & 0xfff
+
+	_, err := config.encodeXDR(c.xw)
+	if err == nil {
+		err = c.flush()
+	}
+	if err != nil {
+		c.close(err)
+	}
+}
+
 func (c *rawConnection) ping() bool {
 	c.Lock()
 	if c.isClosed() {
@@ -386,24 +389,14 @@ loop:
 				c.Unlock()
 			}
 
-		case messageTypeOptions:
-			var om OptionsMessage
-			om.decodeXDR(c.xr)
+		case messageTypeClusterConfig:
+			var cm ClusterConfigMessage
+			cm.decodeXDR(c.xr)
 			if c.xr.Error() != nil {
 				c.close(c.xr.Error())
 				break loop
-			}
-
-			c.optionsLock.Lock()
-			c.peerOptions = make(map[string]string, len(om.Options))
-			for _, opt := range om.Options {
-				c.peerOptions[opt.Key] = opt.Value
-			}
-			c.optionsLock.Unlock()
-
-			if mh, rh := c.myOptions["clusterHash"], c.peerOptions["clusterHash"]; len(mh) > 0 && len(rh) > 0 && mh != rh {
-				c.close(ErrClusterHash)
-				break loop
+			} else {
+				go c.receiver.ClusterConfig(c.id, cm)
 			}
 
 		default:
@@ -472,9 +465,3 @@ func (c *rawConnection) Statistics() Statistics {
 		OutBytesTotal: int(c.xw.Tot()),
 	}
 }
-
-func (c *rawConnection) Option(key string) string {
-	c.optionsLock.Lock()
-	defer c.optionsLock.Unlock()
-	return c.peerOptions[key]
-}

protocol/protocol_test.go

@@ -25,8 +25,8 @@ func TestPing(t *testing.T) {
 	ar, aw := io.Pipe()
 	br, bw := io.Pipe()
 
-	c0 := NewConnection("c0", ar, bw, nil, nil).(wireFormatConnection).next.(*rawConnection)
-	c1 := NewConnection("c1", br, aw, nil, nil).(wireFormatConnection).next.(*rawConnection)
+	c0 := NewConnection("c0", ar, bw, nil).(wireFormatConnection).next.(*rawConnection)
+	c1 := NewConnection("c1", br, aw, nil).(wireFormatConnection).next.(*rawConnection)
 
 	if ok := c0.ping(); !ok {
 		t.Error("c0 ping failed")
@@ -49,8 +49,8 @@ func TestPingErr(t *testing.T) {
 			eaw := &ErrPipe{PipeWriter: *aw, max: i, err: e}
 			ebw := &ErrPipe{PipeWriter: *bw, max: j, err: e}
 
-			c0 := NewConnection("c0", ar, ebw, m0, nil).(wireFormatConnection).next.(*rawConnection)
-			NewConnection("c1", br, eaw, m1, nil)
+			c0 := NewConnection("c0", ar, ebw, m0).(wireFormatConnection).next.(*rawConnection)
+			NewConnection("c1", br, eaw, m1)
 
 			res := c0.ping()
 			if (i < 4 || j < 4) && res {
@@ -125,8 +125,8 @@ func TestVersionErr(t *testing.T) {
 	ar, aw := io.Pipe()
 	br, bw := io.Pipe()
 
-	c0 := NewConnection("c0", ar, bw, m0, nil).(wireFormatConnection).next.(*rawConnection)
-	NewConnection("c1", br, aw, m1, nil)
+	c0 := NewConnection("c0", ar, bw, m0).(wireFormatConnection).next.(*rawConnection)
+	NewConnection("c1", br, aw, m1)
 
 	c0.xw.WriteUint32(encodeHeader(header{
 		version: 2,
@@ -147,8 +147,8 @@ func TestTypeErr(t *testing.T) {
 	ar, aw := io.Pipe()
 	br, bw := io.Pipe()
 
-	c0 := NewConnection("c0", ar, bw, m0, nil).(wireFormatConnection).next.(*rawConnection)
-	NewConnection("c1", br, aw, m1, nil)
+	c0 := NewConnection("c0", ar, bw, m0).(wireFormatConnection).next.(*rawConnection)
+	NewConnection("c1", br, aw, m1)
 
 	c0.xw.WriteUint32(encodeHeader(header{
 		version: 0,
@@ -169,8 +169,8 @@ func TestClose(t *testing.T) {
 	ar, aw := io.Pipe()
 	br, bw := io.Pipe()
 
-	c0 := NewConnection("c0", ar, bw, m0, nil).(wireFormatConnection).next.(*rawConnection)
-	NewConnection("c1", br, aw, m1, nil)
+	c0 := NewConnection("c0", ar, bw, m0).(wireFormatConnection).next.(*rawConnection)
+	NewConnection("c1", br, aw, m1)
 
 	c0.close(nil)
 

protocol/wireformat.go

@@ -30,10 +30,10 @@ func (c wireFormatConnection) Request(repo, name string, offset int64, size int)
 	return c.next.Request(repo, name, offset, size)
 }
 
-func (c wireFormatConnection) Statistics() Statistics {
-	return c.next.Statistics()
+func (c wireFormatConnection) ClusterConfig(config ClusterConfigMessage) {
+	c.next.ClusterConfig(config)
 }
 
-func (c wireFormatConnection) Option(key string) string {
-	return c.next.Option(key)
+func (c wireFormatConnection) Statistics() Statistics {
+	return c.next.Statistics()
 }