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vsock.go
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vsock.go
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/*
* 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"
"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, fmt.Errorf("failed to convert %q to vsock cid: %w", addr[0], err)
}
port, err := strconv.ParseUint(addr[1], 10, 32)
if err != nil {
return nil, fmt.Errorf("failed to convert %q to vsock port: %w", addr[1], err)
}
conn, err := vsock.Dial(uint32(cid), uint32(port), nil)
if err != nil {
return nil, fmt.Errorf("failed to dial vsock %v:%v, address %s: %w", uint32(cid), uint32(port), address, err)
}
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
}