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copied!<h3>EDIT</h3> <p>Your should consider <strong>integrating with <a href="http://anyterm.org/howitworks.html" rel="nofollow noreferrer">AnyTerm</a></strong>. You can then either expose AnyTerm directly e.g. via Apache <code>mod_proxy</code>, or have your Rails controller act as the reverse proxy (handling authentication/session validation, then playing back <code>controller.request</code> minus any cookies to <code>localhost:<AnyTerm-daemon-port></code>, and sending back as a response whatever AnyTerm replies with.)</p> <pre><code>class ConsoleController < ApplicationController # AnyTerm speaks via HTTP POST only def update # validate session ... # forward request to AnyTerm response = Net::HTTP.post_form(URI.parse('http://localhost:#{AnyTermPort}/', request.params)) headers['Content-Type'] = response['Content-Type'] render_text response.body, response.status end </code></pre> <p>Otherwise, you'd need to use <a href="http://ruby-doc.org/core/classes/IO.html#M002246" rel="nofollow noreferrer">IO::Select</a> or <a href="http://ruby-doc.org/core/classes/IO.html#M002267" rel="nofollow noreferrer">IO::read_noblock</a> to know when data is available to be read (from either network or subprocess) so you don't deadlock. See <a href="https://stackoverflow.com/questions/946738/detect-key-press-non-blocking-w-o-getc-gets-in-ruby">this</a> too. Also check that either your Rails is used in a multi-threaded environment <em>or</em> that your Ruby version is not affected by <a href="http://redmine.ruby-lang.org/issues/show/1993" rel="nofollow noreferrer">this IO::Select bug</a>.</p> <p>You can start with something along these lines:</p> <pre><code>status = POpen4::popen4("ping localhost") do |stdout, stderr, stdin, pid| puts "PID #{pid}" # our buffers stdout_lines="" stderr_lines="" begin loop do # check whether stdout, stderr or both are # ready to be read from without blocking IO.select([stdout,stderr]).flatten.compact.each { |io| # stdout, if ready, goes to stdout_lines stdout_lines += io.readpartial(1024) if io.fileno == stdout.fileno # stderr, if ready, goes to stdout_lines stderr_lines += io.readpartial(1024) if io.fileno == stderr.fileno } break if stdout.closed? && stderr.closed? # if we acumulated any complete lines (\n-terminated) # in either stdout/err_lines, output them now stdout_lines.sub!(/.*\n/m) { puts $& ; '' } stderr_lines.sub!(/.*\n/m) { puts $& ; '' } end rescue EOFError puts "Done" end end </code></pre> <p>To also handle <code>stdin</code>, change to:</p> <pre><code> IO.select([stdout,stderr],[stdin]).flatten.compact.each { |io| # program ready to get stdin? do we have anything for it? if io.fileno == stdin.fileno && <got data from client?> <write a small chunk from client to stdin> end # stdout, if ready, goes to stdout_lines </code></pre>

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