Xray-core/transport/internet/grpc/dial.go

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package grpc
import (
"context"
gonet "net"
"sync"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/backoff"
"google.golang.org/grpc/connectivity"
"google.golang.org/grpc/credentials"
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"google.golang.org/grpc/keepalive"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/transport/internet"
"github.com/xtls/xray-core/transport/internet/grpc/encoding"
"github.com/xtls/xray-core/transport/internet/tls"
)
func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (internet.Connection, error) {
newError("creating connection to ", dest).WriteToLog(session.ExportIDToError(ctx))
conn, err := dialgRPC(ctx, dest, streamSettings)
if err != nil {
return nil, newError("failed to dial gRPC").Base(err)
}
return internet.Connection(conn), nil
}
func init() {
common.Must(internet.RegisterTransportDialer(protocolName, Dial))
}
type dialerConf struct {
net.Destination
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*internet.MemoryStreamConfig
}
type dialerCanceller func()
var (
globalDialerMap map[dialerConf]*grpc.ClientConn
globalDialerAccess sync.Mutex
)
func dialgRPC(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (net.Conn, error) {
grpcSettings := streamSettings.ProtocolSettings.(*Config)
conn, canceller, err := getGrpcClient(ctx, dest, streamSettings)
if err != nil {
return nil, newError("Cannot dial gRPC").Base(err)
}
client := encoding.NewGRPCServiceClient(conn)
if grpcSettings.MultiMode {
newError("using gRPC multi mode").AtDebug().WriteToLog()
grpcService, err := client.(encoding.GRPCServiceClientX).TunMultiCustomName(ctx, grpcSettings.getNormalizedName())
if err != nil {
canceller()
return nil, newError("Cannot dial gRPC").Base(err)
}
return encoding.NewMultiHunkConn(grpcService, nil), nil
}
grpcService, err := client.(encoding.GRPCServiceClientX).TunCustomName(ctx, grpcSettings.getNormalizedName())
if err != nil {
canceller()
return nil, newError("Cannot dial gRPC").Base(err)
}
return encoding.NewHunkConn(grpcService, nil), nil
}
func getGrpcClient(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (*grpc.ClientConn, dialerCanceller, error) {
globalDialerAccess.Lock()
defer globalDialerAccess.Unlock()
if globalDialerMap == nil {
globalDialerMap = make(map[dialerConf]*grpc.ClientConn)
}
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tlsConfig := tls.ConfigFromStreamSettings(streamSettings)
sockopt := streamSettings.SocketSettings
grpcSettings := streamSettings.ProtocolSettings.(*Config)
canceller := func() {
globalDialerAccess.Lock()
defer globalDialerAccess.Unlock()
delete(globalDialerMap, dialerConf{dest, streamSettings})
}
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if client, found := globalDialerMap[dialerConf{dest, streamSettings}]; found && client.GetState() != connectivity.Shutdown {
return client, canceller, nil
}
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var dialOptions = []grpc.DialOption{
grpc.WithConnectParams(grpc.ConnectParams{
Backoff: backoff.Config{
BaseDelay: 500 * time.Millisecond,
Multiplier: 1.5,
Jitter: 0.2,
MaxDelay: 19 * time.Second,
},
MinConnectTimeout: 5 * time.Second,
}),
grpc.WithContextDialer(func(gctx context.Context, s string) (gonet.Conn, error) {
gctx = session.ContextWithID(gctx, session.IDFromContext(ctx))
gctx = session.ContextWithOutbound(gctx, session.OutboundFromContext(ctx))
rawHost, rawPort, err := net.SplitHostPort(s)
select {
case <-gctx.Done():
return nil, gctx.Err()
default:
}
if err != nil {
return nil, err
}
if len(rawPort) == 0 {
rawPort = "443"
}
port, err := net.PortFromString(rawPort)
if err != nil {
return nil, err
}
address := net.ParseAddress(rawHost)
return internet.DialSystem(gctx, net.TCPDestination(address, port), sockopt)
}),
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}
if tlsConfig != nil {
dialOptions = append(dialOptions, grpc.WithTransportCredentials(credentials.NewTLS(tlsConfig.GetTLSConfig())))
} else {
dialOptions = append(dialOptions, grpc.WithInsecure())
}
if grpcSettings.IdleTimeout > 0 || grpcSettings.HealthCheckTimeout > 0 || grpcSettings.PermitWithoutStream {
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dialOptions = append(dialOptions, grpc.WithKeepaliveParams(keepalive.ClientParameters{
Time: time.Second * time.Duration(grpcSettings.IdleTimeout),
Timeout: time.Second * time.Duration(grpcSettings.HealthCheckTimeout),
PermitWithoutStream: grpcSettings.PermitWithoutStream,
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}))
}
var grpcDestHost string
if dest.Address.Family().IsDomain() {
grpcDestHost = dest.Address.Domain()
} else {
grpcDestHost = dest.Address.IP().String()
}
conn, err := grpc.Dial(
gonet.JoinHostPort(grpcDestHost, dest.Port.String()),
dialOptions...,
)
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globalDialerMap[dialerConf{dest, streamSettings}] = conn
return conn, canceller, err
}