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mux_transport.go
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mux_transport.go
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/*
* Copyright 2021 CloudWeGo 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 netpollmux
import (
"encoding/binary"
"fmt"
"github.com/cloudwego/netpoll"
"github.com/cloudwego/kitex/pkg/remote/codec"
)
// 0-4Byte length, 4-8Byte version check, 8-12Byte seqID
func parseHeader(reader netpoll.Reader) (length int, seqID int32, err error) {
buf, err := reader.Peek(3 * codec.Size32)
if err != nil {
return 0, 0, err
}
// add length self 4 bytes
length = int(binary.BigEndian.Uint32(buf[:codec.Size32])) + 4
if length <= 4 {
return 0, 0, fmt.Errorf("mux read head length[%d] invalid", length-4)
}
// check version
if !codec.IsTTHeader(buf[:2*codec.Size32]) {
return 0, 0, fmt.Errorf("mux read check protocol failed, just support TTHeader")
}
seqID = int32(binary.BigEndian.Uint32(buf[2*codec.Size32 : 3*codec.Size32]))
return length, seqID, nil
}