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5202f95604
Rather than re-execing docker as the proxy, create a new command docker-proxy that is much smaller to save memory in the case where there are a lot of procies being created. Also allows the proxy to be replaced, for example in Docker for Mac we have a proxy that proxies to osx instead of locally. This is the vendoring pull for https://github.com/docker/docker/pull/23312 Signed-off-by: Justin Cormack <justin.cormack@docker.com>
37 lines
1.2 KiB
Go
37 lines
1.2 KiB
Go
// docker-proxy provides a network Proxy interface and implementations for TCP
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// and UDP.
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package main
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import (
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"fmt"
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"net"
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)
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// Proxy defines the behavior of a proxy. It forwards traffic back and forth
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// between two endpoints : the frontend and the backend.
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// It can be used to do software port-mapping between two addresses.
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// e.g. forward all traffic between the frontend (host) 127.0.0.1:3000
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// to the backend (container) at 172.17.42.108:4000.
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type Proxy interface {
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// Run starts forwarding traffic back and forth between the front
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// and back-end addresses.
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Run()
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// Close stops forwarding traffic and close both ends of the Proxy.
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Close()
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// FrontendAddr returns the address on which the proxy is listening.
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FrontendAddr() net.Addr
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// BackendAddr returns the proxied address.
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BackendAddr() net.Addr
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}
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// NewProxy creates a Proxy according to the specified frontendAddr and backendAddr.
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func NewProxy(frontendAddr, backendAddr net.Addr) (Proxy, error) {
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switch frontendAddr.(type) {
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case *net.UDPAddr:
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return NewUDPProxy(frontendAddr.(*net.UDPAddr), backendAddr.(*net.UDPAddr))
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case *net.TCPAddr:
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return NewTCPProxy(frontendAddr.(*net.TCPAddr), backendAddr.(*net.TCPAddr))
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default:
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panic(fmt.Errorf("Unsupported protocol"))
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}
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}
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