Module: GDKBox::Ports

Defined in:
lib/gdkbox/ports.rb

Overview

Answers whether a host port is actually usable.

gdkbox's metadata store only knows about ports gdkbox itself allocated; anything else on the machine — typically a locally running GDK on 2222 and 3000 — is invisible to it. Binding is the authoritative test: gdkbox publishes container ports on 127.0.0.1, so try to bind exactly there.

Class Method Summary collapse

Class Method Details

.bound?(port) ⇒ Boolean

True when something on the host already holds the port (or the bind is not permitted, which is just as unusable for publishing).

Returns:

  • (Boolean) 


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# File 'lib/gdkbox/ports.rb', line 17

def bound?(port)
  TCPServer.new("127.0.0.1", port).close
  false
rescue SystemCallError
  true
end