dswu26846 2016-03-25 19:29
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golang有效的二进制编码

I have a program that sends udp packets. a packet datagram is represented by the following struct (notice that the size of the packet isn't fixed):

type packet struct {
    dataLength uint16
    id [8]byte
    pairity, shards, flags byte
    blob []byte // length defined by dataLength 
}

I used encoding/binary package to do serialization/deserialization but it wasn't efficient enough (used pprof). it wasted alot of CPU time and I couldn't utilize the whole network speed because of that.

for example, consider the following code:

packet := packet{
    dataLength: 4,
    id: [8]byte{1,2,3,4,5,6,7,8},
    pairity: 10,
    shards: 50,
    flags: 200,
    blob: []byte{1,2,3,4},
}
bufToSendOverNetwork := packet.ToBytes()

What is the most efficient way to do this operation (and also the .FromBytes operation)

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  • duanmianhong4893 2016-03-25 19:34
    关注

    encoding/binary.Write uses reflection, so it will be slower than anything that manually constructs the buffer. Below is an example of such a function:

    import (
        "encoding/binary"
    )
    
    func (p *packet) ToBytes() []byte {
        buff := make([]byte, 2 + 8 + 3 + len(p.blob))
    
        binary.BigEndian.PutUint16(buff[:2], p.dataLength)
        copy(buff[2:10], p.id[:])
        buff[10] = p.pairity
        buff[11] = p.shards
        buff[12] = p.flags
        copy(buff[13:], p.blob)
    
        return buff
    }
    
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