sing-box/transport/v2raygrpc/client.go

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package v2raygrpc
import (
"context"
"crypto/tls"
"net"
"sync"
"time"
"github.com/sagernet/sing-box/adapter"
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"github.com/sagernet/sing-box/option"
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"github.com/sagernet/sing/common"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
"google.golang.org/grpc"
"google.golang.org/grpc/backoff"
"google.golang.org/grpc/connectivity"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/credentials/insecure"
)
var _ adapter.V2RayClientTransport = (*Client)(nil)
type Client struct {
ctx context.Context
dialer N.Dialer
serverAddr string
serviceName string
dialOptions []grpc.DialOption
conn *grpc.ClientConn
connAccess sync.Mutex
}
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func NewClient(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, options option.V2RayGRPCOptions, tlsConfig *tls.Config) adapter.V2RayClientTransport {
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var dialOptions []grpc.DialOption
if tlsConfig != nil {
dialOptions = append(dialOptions, grpc.WithTransportCredentials(credentials.NewTLS(tlsConfig)))
} else {
dialOptions = append(dialOptions, grpc.WithTransportCredentials(insecure.NewCredentials()))
}
dialOptions = append(dialOptions, 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,
}))
dialOptions = append(dialOptions, grpc.WithContextDialer(func(ctx context.Context, server string) (net.Conn, error) {
return dialer.DialContext(ctx, N.NetworkTCP, M.ParseSocksaddr(server))
}))
dialOptions = append(dialOptions, grpc.WithReturnConnectionError())
return &Client{
ctx: ctx,
dialer: dialer,
serverAddr: serverAddr.String(),
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serviceName: options.ServiceName,
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dialOptions: dialOptions,
}
}
func (c *Client) Close() error {
return common.Close(c.conn)
}
func (c *Client) connect() (*grpc.ClientConn, error) {
conn := c.conn
if conn != nil && conn.GetState() != connectivity.Shutdown {
return conn, nil
}
c.connAccess.Lock()
defer c.connAccess.Unlock()
conn = c.conn
if conn != nil && conn.GetState() != connectivity.Shutdown {
return conn, nil
}
conn, err := grpc.DialContext(c.ctx, c.serverAddr, c.dialOptions...)
if err != nil {
return nil, err
}
c.conn = conn
return conn, nil
}
func (c *Client) DialContext(ctx context.Context) (net.Conn, error) {
clientConn, err := c.connect()
if err != nil {
return nil, err
}
client := NewGunServiceClient(clientConn).(GunServiceCustomNameClient)
ctx, cancel := context.WithCancel(ctx)
stream, err := client.TunCustomName(ctx, c.serviceName)
if err != nil {
cancel()
return nil, err
}
return NewGRPCConn(stream, cancel), nil
}