英文:
How to discard any incoming data in a connection in Go?
问题
我正在向远程服务器发送一个请求，但不关心它的响应。我不想直接关闭连接，因为如果这样做，服务器会出现"Broken pipe"错误。
我目前使用一个缓冲区循环调用Read()方法：
con, _ := net.Dial("tcp", host)
// ...
data := make([]byte, 512)
for {
if _, err = con.Read(data); err == io.EOF {
break
}
}
但我想要的是类似于Bash中的>/dev/null的效果。我找到了ioutils.Discard，但它是一个io.Writer，而con.Read只能在[]byte缓冲区上工作。
有没有比我目前做的读取缓冲区更高效的方法？
英文:
I’m sending a request to a remote server, but don’t care about its response. I don’t want to close the connection directly because the server gets a Broken pipe error if I do that.
I currently loop on Read() calls with a buffer:
con, _ := net.Dial("tcp", host)
// ...
data := make([]byte, 512)
for {
if _, err = con.Read(data); err == io.EOF {
break
}
}
But I’m looking for something like >/dev/null in Bash. I’ve found ioutils.Discard, but it’s an io.Writer and con.Read only works on a []byte buffer.
Is there a more efficient way than just reading in a buffer like what I’m currently doing?
答案1
得分: 33
你需要像这样使用ioutil.Discard：
io.Copy(ioutil.Discard, con)
io.Copy函数从源io.Reader复制到目标io.Writer。
func Copy(dst Writer, src Reader) (written int64, err error)。
io.Reader是一个接口，定义如下：
type Reader interface {
Read(p []byte) (n int, err error)
}
io.Writer是一个接口，定义如下：
type Writer interface {
Write(p []byte) (n int, err error)
}
net.Conn实现了io.Reader接口，而ioutil.Discard实现了io.Writer接口。
英文:
you have to use ioutil.Discard like this
io.Copy(ioutil.Discard, con)
io.Copy copies from a src io.Reader to a io.Writer
func Copy(dst Writer, src Reader) (written int64, err error)
io.Reader is an interface defined as
type Reader interface {
Read(p []byte) (n int, err error)
}
io.Writer
type Writer interface {
Write(p []byte) (n int, err error)
}
net.Conn implements io.Reader and ioutil.Discard implements io.Writer
答案2
得分: 9
自Go 1.16（2021年2月）起，程序应该使用io.Discard：
package main
import (
"fmt"
"io"
)
func main() {
fmt.Fprint(io.Discard, "hello world")
}
https://golang.org/pkg/io#Discard
英文:
Since Go 1.16 (Feb 2021), programs should be using io.Discard:
package main
import (
"fmt"
"io"
)
func main() {
fmt.Fprint(io.Discard, "hello world")
}
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