Golang:http服务器离开开放的goroutines

Question

我已经建立了一个用Go编写的http服务器,每天有超过一千个访问者.我现在有一个累积的Goroutine问题.在一天的过程中,我似乎从http服务器上获得了一千多个新的Goroutines.

我不知道怎么会弄乱处理程序.

http.Handle("/", http.FileServer(http.Dir(config.htdocs_path)))

下面是堆栈中的一个goroutines

goroutine 1582 [chan receive]:
net.(*pollServer).WaitRead(0xf84007f680, 0xf84066dea0, 0xf84007aa80, 0xb, 0x1, ...)
        /home/ec2-user/go/src/pkg/net/fd.go:268 +0x73
net.(*netFD).Read(0xf84066dea0, 0xf840ec1000, 0x100000001000, 0x7f7effffffff, 0xf84007c0f0, ...)
        /home/ec2-user/go/src/pkg/net/fd.go:428 +0x1ec
net.(*TCPConn).Read(0xf84068aff8, 0xf840ec1000, 0x100000001000, 0xf800000002, 0x0, ...)
        /home/ec2-user/go/src/pkg/net/tcpsock_posix.go:87 +0xce
io.(*LimitedReader).Read(0xf840d1bc20, 0xf840ec1000, 0x100000001000, 0xdcb00000000, 0x0, ...)
        /home/ec2-user/go/src/pkg/io/io.go:394 +0xc1
bufio.(*Reader).fill(0xf8405b0900, 0xdcb00000000)
        /home/ec2-user/go/src/pkg/bufio/bufio.go:77 +0xf0
bufio.(*Reader).ReadSlice(0xf8405b0900, 0xf840d1bc0a, 0x0, 0x0, 0x0, ...)
        /home/ec2-user/go/src/pkg/bufio/bufio.go:257 +0x1b6
bufio.(*Reader).ReadLine(0xf8405b0900, 0x0, 0x0, 0x0, 0x0, ...)
        /home/ec2-user/go/src/pkg/bufio/bufio.go:283 +0x5b
net/textproto.(*Reader).readLineSlice(0xf840730660, 0xc0, 0x100000000, 0x7f7e00000001)
        /home/ec2-user/go/src/pkg/net/textproto/reader.go:55 +0x4f
net/textproto.(*Reader).ReadLine(0xf840730660, 0xf84061f300, 0x0, 0x48411c)
        /home/ec2-user/go/src/pkg/net/textproto/reader.go:36 +0x25
net/http.ReadRequest(0xf8405b0900, 0xf84061f300, 0x0, 0x0, 0x100000400ccf60, ...)
        /home/ec2-user/go/src/pkg/net/http/request.go:457 +0xb1
net/http.(*conn).readRequest(0xf8402b2b40, 0xf8400e3fc0, 0x0, 0x0, 0xf8405b0a80, ...)
        /home/ec2-user/go/src/pkg/net/http/server.go:240 +0xa8
net/http.(*conn).serve(0xf8402b2b40, 0x0)
        /home/ec2-user/go/src/pkg/net/http/server.go:594 +0x145
created by net/http.(*Server).Serve
        /home/ec2-user/go/src/pkg/net/http/server.go:1040 +0x430

似乎连接陷入了读取状态.就像http服务器没有计时出来.默认服务器没有读取超时吗？

去版本go1

Answer 1

所有这些goroutines正在阅读的原因是保持活力.当浏览器发送保持活动标头时,服务器会保持连接打开以接受更多请求.当客户端请求许多小文件并且TCP连接开销很大时,这是一件好事.读取超时将确保没有连接在请求之间保持活动超过一定时间.这将关闭保持活动连接,但也阻止某人上传超过超时.不幸的是,还没有保持活动的特定超时选项.

默认情况下,没有超时.您可以在Server结构http://golang.org/pkg/net/http/#Server中设置超时

srv := &http.Server{
    Handler: http.FileServer(http.Dir(config.htdocs_path)),
    ReadTimeout: 30*time.Second,
}
srv.ListenAndServe()