moby--moby/pkg/timeoutconn/timeoutconn.go

// Package timeoutconn provides overridden net.Conn that supports deadline (timeout).
package timeoutconn

import (
	"net"
	"time"
)

// New creates a net.Conn with a timeout for every Read operation.
func New(netConn net.Conn, timeout time.Duration) net.Conn {
	return &conn{netConn, timeout}
}

// A net.Conn that sets a deadline for every Read operation.
// FIXME was documented the deadline was on Write operation too but not implement
type conn struct {
	net.Conn
	timeout time.Duration
}

func (c *conn) Read(b []byte) (int, error) {
	if c.timeout > 0 {
		if err := c.Conn.SetReadDeadline(time.Now().Add(c.timeout)); err != nil {
			return 0, err
		}
	}
	return c.Conn.Read(b)
}