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local.go
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local.go
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package expose
import (
"fmt"
"net"
"net/url"
)
type localExposer struct {
publicIP net.IP
port uint16
}
// Create a local exposer implementation. Local exposers are useful for local
// testing, and simply exposes the URL as given, or (for ExposeTCPPort) proxies
// a websocket on localhost to the port.
func NewLocal(publicIP net.IP, port uint16) (Exposer, error) {
return &localExposer{publicIP, port}, nil
}
func (exposer *localExposer) ExposeHTTP(targetPort uint16) (Exposure, error) {
exposure := &localHTTPExposure{exposer: exposer, targetPort: targetPort}
err := exposure.start()
if err != nil {
return nil, err
}
return exposure, nil
}
func (exposer *localExposer) ExposeTCPPort(targetPort uint16) (Exposure, error) {
exposure := &localPortExposure{exposer: exposer, targetPort: targetPort}
err := exposure.start()
if err != nil {
return nil, err
}
return exposure, nil
}
// getURL is a utility function for local exposures
func (exposer *localExposer) getURL(listener net.Listener, scheme string) *url.URL {
_, portStr, _ := net.SplitHostPort(listener.Addr().String())
return &url.URL{
Scheme: scheme,
Host: fmt.Sprintf("%s:%s", exposer.publicIP, portStr),
}
}
type localHTTPExposure struct {
exposer *localExposer
targetPort uint16
listener net.Listener
proxy exposeProxy
}
func (exposure *localHTTPExposure) start() error {
// port can be allocated dynamically `:0`
// or passed as predefined port which could be used for testing or local development
listener, err := net.Listen("tcp", fmt.Sprintf(":%d", exposure.exposer.port))
if err != nil {
return err
}
exposure.listener = listener
proxy, err := proxyHTTP(listener, exposure.targetPort)
if err != nil {
listener.Close()
return err
}
exposure.proxy = proxy
return nil
}
func (exposure *localHTTPExposure) Close() error {
if exposure.proxy != nil {
if err := exposure.proxy.Close(); err != nil {
return err
}
}
exposure.proxy = nil
return nil
}
func (exposure *localHTTPExposure) GetURL() *url.URL {
return exposure.exposer.getURL(exposure.listener, "http")
}
type localPortExposure struct {
exposer *localExposer
targetPort uint16
listener net.Listener
proxy exposeProxy
}
func (exposure *localPortExposure) start() error {
// allocate a port dynamically by specifying :0
listener, err := net.Listen("tcp", ":0")
if err != nil {
return err
}
exposure.listener = listener
proxy, err := proxyTCPPort(listener, exposure.targetPort)
if err != nil {
listener.Close()
return err
}
exposure.proxy = proxy
return nil
}
func (exposure *localPortExposure) Close() error {
if exposure.proxy != nil {
if err := exposure.proxy.Close(); err != nil {
return err
}
}
exposure.proxy = nil
return nil
}
func (exposure *localPortExposure) GetURL() *url.URL {
return exposure.exposer.getURL(exposure.listener, "ws")
}