github.com/cloudwego/kitex@v0.9.0/pkg/remote/trans/nphttp2/server_conn.go (about)

     1  /*
     2   * Copyright 2021 CloudWeGo Authors
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package nphttp2
    18  
    19  import (
    20  	"encoding/binary"
    21  	"io"
    22  	"net"
    23  	"time"
    24  
    25  	"github.com/cloudwego/kitex/pkg/remote/trans/nphttp2/codes"
    26  	"github.com/cloudwego/kitex/pkg/remote/trans/nphttp2/grpc"
    27  	"github.com/cloudwego/kitex/pkg/remote/trans/nphttp2/status"
    28  	"github.com/cloudwego/kitex/pkg/streaming"
    29  )
    30  
    31  type serverConn struct {
    32  	tr grpc.ServerTransport
    33  	s  *grpc.Stream
    34  }
    35  
    36  var _ GRPCConn = (*serverConn)(nil)
    37  
    38  func newServerConn(tr grpc.ServerTransport, s *grpc.Stream) *serverConn {
    39  	return &serverConn{
    40  		tr: tr,
    41  		s:  s,
    42  	}
    43  }
    44  
    45  func (c *serverConn) ReadFrame() (hdr, data []byte, err error) {
    46  	hdr = make([]byte, 5)
    47  	_, err = c.Read(hdr)
    48  	if err != nil {
    49  		return nil, nil, err
    50  	}
    51  	dLen := int(binary.BigEndian.Uint32(hdr[1:]))
    52  	data = make([]byte, dLen)
    53  	_, err = c.Read(data)
    54  	if err != nil {
    55  		return nil, nil, err
    56  	}
    57  	return hdr, data, nil
    58  }
    59  
    60  func GetServerConn(st streaming.Stream) (GRPCConn, error) {
    61  	serverStream, ok := st.(*stream)
    62  	if !ok {
    63  		// err!
    64  		return nil, status.Errorf(codes.Internal, "failed to get server conn from stream.")
    65  	}
    66  	grpcServerConn, ok := serverStream.conn.(GRPCConn)
    67  	if !ok {
    68  		// err!
    69  		return nil, status.Errorf(codes.Internal, "failed to trans conn to grpc conn.")
    70  	}
    71  	return grpcServerConn, nil
    72  }
    73  
    74  // impl net.Conn
    75  func (c *serverConn) Read(b []byte) (n int, err error) {
    76  	n, err = c.s.Read(b)
    77  	return n, err
    78  }
    79  
    80  func (c *serverConn) Write(b []byte) (n int, err error) {
    81  	if len(b) < 5 {
    82  		return 0, io.ErrShortWrite
    83  	}
    84  	return c.WriteFrame(b[:5], b[5:])
    85  }
    86  
    87  func (c *serverConn) WriteFrame(hdr, data []byte) (n int, err error) {
    88  	// server sets the END_STREAM flag in trailer when writeStatus
    89  	err = c.tr.Write(c.s, hdr, data, &grpc.Options{})
    90  	return len(hdr) + len(data), err
    91  }
    92  
    93  func (c *serverConn) LocalAddr() net.Addr                { return c.tr.LocalAddr() }
    94  func (c *serverConn) RemoteAddr() net.Addr               { return c.tr.RemoteAddr() }
    95  func (c *serverConn) SetDeadline(t time.Time) error      { return nil }
    96  func (c *serverConn) SetReadDeadline(t time.Time) error  { return nil }
    97  func (c *serverConn) SetWriteDeadline(t time.Time) error { return nil }
    98  func (c *serverConn) Close() error {
    99  	return c.tr.WriteStatus(c.s, status.New(codes.OK, ""))
   100  }