mirror of https://github.com/status-im/consul.git
62 lines
1.7 KiB
Go
62 lines
1.7 KiB
Go
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package proxy
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import (
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"io"
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"net"
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"sync/atomic"
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)
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// Conn represents a single proxied TCP connection.
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type Conn struct {
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src, dst net.Conn
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stopping int32
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}
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// NewConn returns a conn joining the two given net.Conn
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func NewConn(src, dst net.Conn) *Conn {
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return &Conn{
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src: src,
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dst: dst,
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stopping: 0,
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}
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}
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// Close closes both connections.
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func (c *Conn) Close() error {
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// Note that net.Conn.Close can be called multiple times and atomic store is
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// idempotent so no need to ensure we only do this once.
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//
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// Also note that we don't wait for CopyBytes to return here since we are
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// closing the conns which is the only externally visible sideeffect of that
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// goroutine running and there should be no way for it to hang or leak once
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// the conns are closed so we can save the extra coordination.
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atomic.StoreInt32(&c.stopping, 1)
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c.src.Close()
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c.dst.Close()
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return nil
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}
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// CopyBytes will continuously copy bytes in both directions between src and dst
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// until either connection is closed.
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func (c *Conn) CopyBytes() error {
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defer c.Close()
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go func() {
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// Need this since Copy is only guaranteed to stop when it's source reader
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// (second arg) hits EOF or error but either conn might close first possibly
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// causing this goroutine to exit but not the outer one. See
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// TestConnSrcClosing which will fail if you comment the defer below.
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defer c.Close()
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io.Copy(c.dst, c.src)
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}()
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_, err := io.Copy(c.src, c.dst)
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// Note that we don't wait for the other goroutine to finish because it either
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// already has due to it's src conn closing, or it will once our defer fires
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// and closes the source conn. No need for the extra coordination.
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if atomic.LoadInt32(&c.stopping) == 1 {
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return nil
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}
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return err
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}
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