osx上运行在localhost上的第一个TCP连接总是正确地解析发送到它的二进制数据。随后的请求会丢失二进制数据,只看到第一个字节[8]。我的阅读器怎么会设置失败?
package main
import (
"fmt"
"log"
"net"
"os"
"app/src/internal/handler"
"github.com/golang-collections/collections/stack"
)
func main() {
port := os.Getenv("SERVER_PORT")
s := stack.New()
ln, err := net.Listen("tcp", ":8080")
if err != nil {
log.Fatalf("net.Listen: %v", err)
}
fmt.Println("Serving on " + port)
for {
conn, err := ln.Accept()
// defer conn.Close()
if err != nil {
log.Fatal("ln.Accept")
}
go handler.Handle(conn, s)
}
}
package handler
import (
"fmt"
"io"
"log"
"net"
"github.com/golang-collections/collections/stack"
)
func Handle(c net.Conn, s *stack.Stack) {
fmt.Printf("Serving %s\n", c.RemoteAddr().String())
buf := make([]byte, 0, 256)
tmp := make([]byte, 128)
n, err := c.Read(tmp)
if err != nil {
if err != io.EOF {
log.Fatalf("connection Read() %v", err)
}
return
}
buf = append(buf, tmp[:n]...)
}
日志:
Serving [::1]:51699
------------- value ---------------:QCXhoy5t
Buffer Length: 9. First Value: 8
Serving [::1]:51700
------------- value ---------------:
Buffer Length: 1. First Value: 8
Serving [::1]:51701
测试发送完毕。
push random string:
QCXhoy5t
push random string:
GPh0EnbS
push random string:
4kJ0wN0R
的文档 读者 说。
Read reads up to len(p) bytes into p. It returns the number of bytes read (0 <= n
<= len(p)) and any error encountered. Even if Read returns n < len(p), it may use
all of p as scratch space during the call. If some data is available but not
len(p) bytes, Read conventionally returns what is available instead of waiting
for more.
所以你的问题最可能的原因是Read正在返回可用的数据(在这种情况下是一个字符)。你可以通过使用 ioutil.ReadAll 或在循环中执行读取(数据被添加到缓冲区的事实使它看起来像是最初的意图),使用类似的东西。
for {
n, err := c.Read(tmp)
if err != nil {
if err != io.EOF {
// Note that data might have also been received - you should process that
// if appropriate.
log.Fatalf("connection Read() %v", err)
return
}
break // All data received so process it
}
buf = append(buf, tmp[:n]...)
}
注意: 不能保证任何数据都被接收到;你应该在尝试访问数据之前检查数据的长度(即 buf[0]
可能会惊慌失措)