英文:
Reading the first UVarInt of a net.Conn buffer
问题
我有一个通过监听端口建立的TCP数据包连接（net.Conn）。
conn, err := ln.Accept()
我需要读取Conn.Read([]byte)缓冲区的第一个UVarInt，它从索引0开始。
以前，我只需要第一个字节，可以使用以下代码轻松实现：
packetSize := make([]byte, 1)
conn.Read(packetSize)
// 使用 packetSize[0] 进行处理
然而，正如之前提到的，我需要获取使用net.Conn.Read()方法能够读取到的第一个UVarInt。请记住，UVarInt的长度可以是任意的，我无法确定（客户端不会发送UVarInt的大小）。但我知道UVarInt从缓冲区的开头开始。
英文:
I have a TCP packet connection (net.Conn) set up by listening on a port.
conn, err := ln.Accept()
I need to read the first UVarInt of the Conn.Read([]byte) buffer, which starts at index 0.
Previously, I would only need the first byte, which is easy to do using
packetSize := make([]byte, 1)
conn.Read(packetSize)
// Do stuff with packetSize[0]
However, as previously mentioned, I need to get the first UVarInt I can reach using the net.Conn.Read() method. Keep in mind that a UVarInt can have pretty much any length, which I cannot be sure of (the client doesn't send the size of the UVarInt). I do know however that the UVarInt starts at the very beginning of the buffer.
答案1
得分: 4
使用bufio.Reader对连接进行包装：
br := bufio.NewReader(conn)
使用binary包通过bufio.Reader来读取无符号varint：
n, err := binary.ReadUvarInt(br)
由于bufio.Reader可以缓冲多个varint，因此您应该在连接上的所有后续读取操作中使用bufio.Reader。
英文:
Wrap the connection with a bufio.Reader:
br := bufio.NewReader(conn)
Use the binary package to read an unsigned varint through the bufio.Reader:
n, err := binary. ReadUvarInt(br)
Because the bufio.Reader can buffer more than the varint, you should use the bufio.Reader for all subsequent reads on the connection.
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