feat: add vsock network type support (#1303)

So we support connecting dfdaemon running on host outside of VM via
virtio-vsock device.

Signed-off-by: Eryu Guan <eguan@linux.alibaba.com>

go.mod

@@ -41,6 +41,7 @@ require (
 	github.com/jarcoal/httpmock v1.0.8
 	github.com/looplab/fsm v0.3.0
 	github.com/mcuadros/go-gin-prometheus v0.1.0
+	github.com/mdlayher/vsock v1.1.1
 	github.com/mitchellh/mapstructure v1.4.1
 	github.com/montanaflynn/stats v0.6.6
 	github.com/onsi/ginkgo/v2 v2.1.0
@@ -155,6 +156,7 @@ require (
 	github.com/mattn/go-isatty v0.0.14 // indirect
 	github.com/mattn/go-runewidth v0.0.13 // indirect
 	github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369 // indirect
+	github.com/mdlayher/socket v0.2.0 // indirect
 	github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect

go.sum

@@ -642,6 +642,10 @@ github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182aff
 github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369/go.mod h1:BSXmuO+STAnVfrANrmjBb36TMTDstsz7MSK+HVaYKv4=
 github.com/mcuadros/go-gin-prometheus v0.1.0 h1:JNoWKvw/u9tyRJ8BL9ZJvfiXU8IHUw8gCvcf/5L8tnI=
 github.com/mcuadros/go-gin-prometheus v0.1.0/go.mod h1:ezECAsiHtCRIa+6Ii8THg7G7RJvpO4S19d499UkEE3s=
+github.com/mdlayher/socket v0.2.0 h1:EY4YQd6hTAg2tcXF84p5DTHazShE50u5HeBzBaNgjkA=
+github.com/mdlayher/socket v0.2.0/go.mod h1:QLlNPkFR88mRUNQIzRBMfXxwKal8H7u1h3bL1CV+f0E=
+github.com/mdlayher/vsock v1.1.1 h1:8lFuiXQnmICBrCIIA9PMgVSke6Fg6V4+r0v7r55k88I=
+github.com/mdlayher/vsock v1.1.1/go.mod h1:Y43jzcy7KM3QB+/FK15pfqGxDMCMzUXWegEfIbSM18U=
 github.com/miekg/dns v1.0.14/go.mod h1:W1PPwlIAgtquWBMBEV9nkV9Cazfe8ScdGz/Lj7v3Nrg=
 github.com/mitchellh/cli v1.0.0/go.mod h1:hNIlj7HEI86fIcpObd7a0FcrxTWetlwJDGcceTlRvqc=
 github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db h1:62I3jR2EmQ4l5rM/4FEfDWcRD+abF5XlKShorW5LRoQ=

pkg/dfnet/dfnet.go

@@ -26,8 +26,13 @@ import (
 type NetworkType string
 
 const (
-	TCP  NetworkType = "tcp"
+	TCP   NetworkType = "tcp"
-	UNIX NetworkType = "unix"
+	UNIX  NetworkType = "unix"
+	VSOCK NetworkType = "vsock"
+
+	TCPEndpointPrefix   string = "dns:///"
+	UnixEndpointPrefix  string = "unix://"
+	VsockEndpointPrefix string = "vsock://"
 )
 
 type NetAddr struct {
@@ -39,9 +44,11 @@ type NetAddr struct {
 func (n NetAddr) GetEndpoint() string {
 	switch n.Type {
 	case UNIX:
-		return "unix://" + n.Addr
+		return UnixEndpointPrefix + n.Addr
+	case VSOCK:
+		return VsockEndpointPrefix + n.Addr
 	default:
-		return "dns:///" + n.Addr
+		return TCPEndpointPrefix + n.Addr
 	}
 }
 

pkg/rpc/dfdaemon/client/client.go

@@ -41,10 +41,15 @@ func GetClientByAddr(addrs []dfnet.NetAddr, opts ...grpc.DialOption) (DaemonClie
 	if len(addrs) == 0 {
 		return nil, errors.New("address list of daemon is empty")
 	}
+
+	dialOpts, err := rpc.VsockDialerOption(addrs, opts)
+	if err != nil {
+		return nil, err
+	}
 	dc := &daemonClient{
 		rpc.NewConnection(context.Background(), "daemon-static", addrs, []rpc.ConnOption{
 			rpc.WithConnExpireTime(60 * time.Second),
-			rpc.WithDialOption(opts),
+			rpc.WithDialOption(dialOpts),
 		}),
 	}
 	return dc, nil

pkg/rpc/vsock.go

@@ -0,0 +1,79 @@
+/*
+ *     Copyright 2022 The Dragonfly Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package rpc
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"strconv"
+	"strings"
+
+	"github.com/mdlayher/vsock"
+	"github.com/pkg/errors"
+	"google.golang.org/grpc"
+
+	"d7y.io/dragonfly/v2/pkg/dfnet"
+)
+
+// VsockDialer is the dialer for vsock, it expects `address` to be in dfnet.NetAddr.GetEndpoint()
+// format, that is "vsock://cid:port"
+func VsockDialer(_ctx context.Context, address string) (net.Conn, error) {
+	addrStr := strings.TrimPrefix(address, dfnet.VsockEndpointPrefix)
+	addr := strings.Split(addrStr, ":")
+	if len(addr) != 2 {
+		return nil, fmt.Errorf("invalid vsock address (%s), expected %scid:port", address, dfnet.VsockEndpointPrefix)
+	}
+
+	cid, err := strconv.ParseUint(addr[0], 10, 32)
+	if err != nil {
+		return nil, errors.Wrapf(err, "failed to convert %q to vsock cid", addr[0])
+	}
+	port, err := strconv.ParseUint(addr[1], 10, 32)
+	if err != nil {
+		return nil, errors.Wrapf(err, "failed to convert %q to vsock port", addr[1])
+	}
+
+	conn, err := vsock.Dial(uint32(cid), uint32(port), nil)
+	if err != nil {
+		return nil, errors.Wrapf(err, "failed to dial vsock %v:%v, address %s", uint32(cid), uint32(port), address)
+	}
+	return conn, nil
+}
+
+// If `addrs` are all vsock addresses, add rpc.VsockDialer to DialOption, and return error if addrs
+// have mixed vsock and other connection types.
+func VsockDialerOption(addrs []dfnet.NetAddr, opts []grpc.DialOption) ([]grpc.DialOption, error) {
+	var prevType dfnet.NetworkType
+	hasVsock := false
+	for n, a := range addrs {
+		if a.Type != dfnet.VSOCK {
+			prevType = a.Type
+			continue
+		}
+		hasVsock = true
+		if n > 0 && prevType != dfnet.VSOCK {
+			return nil, fmt.Errorf("addrs(%v) have mixed vsock and other types", addrs)
+		}
+		prevType = a.Type
+	}
+	dialOpts := opts
+	if hasVsock {
+		dialOpts = append(opts, grpc.WithContextDialer(VsockDialer))
+	}
+	return dialOpts, nil
+}