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fcbb2bf348
This makes it more maintainable for other code to statically depend on the exact value of this string. It also makes it easier to identify what code might depend on this string by looking up references to this constant. Updates tailscale/corp#13777 Signed-off-by: Joe Tsai <joetsai@digital-static.net>
115 lines
2.7 KiB
Go
115 lines
2.7 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package memnet
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import (
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"net"
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"net/netip"
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"time"
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)
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// NetworkName is the network name returned by [net.Addr.Network]
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// for [net.Conn.LocalAddr] and [net.Conn.RemoteAddr] from the [Conn] type.
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const NetworkName = "mem"
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// Conn is a net.Conn that can additionally have its reads and writes blocked and unblocked.
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type Conn interface {
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net.Conn
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// SetReadBlock blocks or unblocks the Read method of this Conn.
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// It reports an error if the existing value matches the new value,
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// or if the Conn has been Closed.
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SetReadBlock(bool) error
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// SetWriteBlock blocks or unblocks the Write method of this Conn.
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// It reports an error if the existing value matches the new value,
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// or if the Conn has been Closed.
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SetWriteBlock(bool) error
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}
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// NewConn creates a pair of Conns that are wired together by pipes.
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func NewConn(name string, maxBuf int) (Conn, Conn) {
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r := NewPipe(name+"|0", maxBuf)
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w := NewPipe(name+"|1", maxBuf)
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return &connHalf{r: r, w: w}, &connHalf{r: w, w: r}
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}
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// NewTCPConn creates a pair of Conns that are wired together by pipes.
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func NewTCPConn(src, dst netip.AddrPort, maxBuf int) (local Conn, remote Conn) {
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r := NewPipe(src.String(), maxBuf)
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w := NewPipe(dst.String(), maxBuf)
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lAddr := net.TCPAddrFromAddrPort(src)
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rAddr := net.TCPAddrFromAddrPort(dst)
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return &connHalf{r: r, w: w, remote: rAddr, local: lAddr}, &connHalf{r: w, w: r, remote: lAddr, local: rAddr}
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}
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type connAddr string
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func (a connAddr) Network() string { return NetworkName }
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func (a connAddr) String() string { return string(a) }
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type connHalf struct {
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local, remote net.Addr
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r, w *Pipe
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}
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func (c *connHalf) LocalAddr() net.Addr {
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if c.local != nil {
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return c.local
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}
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return connAddr(c.r.name)
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}
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func (c *connHalf) RemoteAddr() net.Addr {
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if c.remote != nil {
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return c.remote
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}
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return connAddr(c.w.name)
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}
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func (c *connHalf) Read(b []byte) (n int, err error) {
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return c.r.Read(b)
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}
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func (c *connHalf) Write(b []byte) (n int, err error) {
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return c.w.Write(b)
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}
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func (c *connHalf) Close() error {
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if err := c.w.Close(); err != nil {
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return err
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}
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return c.r.Close()
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}
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func (c *connHalf) SetDeadline(t time.Time) error {
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err1 := c.SetReadDeadline(t)
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err2 := c.SetWriteDeadline(t)
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if err1 != nil {
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return err1
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}
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return err2
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}
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func (c *connHalf) SetReadDeadline(t time.Time) error {
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return c.r.SetReadDeadline(t)
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}
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func (c *connHalf) SetWriteDeadline(t time.Time) error {
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return c.w.SetWriteDeadline(t)
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}
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func (c *connHalf) SetReadBlock(b bool) error {
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if b {
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return c.r.Block()
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}
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return c.r.Unblock()
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}
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func (c *connHalf) SetWriteBlock(b bool) error {
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if b {
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return c.w.Block()
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}
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return c.w.Unblock()
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}
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