Start and Call Ruby Http Server in the Same Script

Launch a script on a separate server from a Rails app

I use ssh for these types of things.

require 'net/ssh'
Net::SSH.start('server.com', 'username', password: "asdasd") do |ssh|
  $stdout.print ssh.exec!("cdc && curl https://gist.github.com/mhenrixon/asdasd123123/raw/123123asdasd/update.rb | rails c production")
end

That's the easiest way of doing it I think but the sinatra/rails listener isn't a bad idea either.

serve current directory from command line

Simplest way possible (thanks Aaron Patterson/n0kada):

ruby -run -e httpd . -p 9090

Alternate, more complex way:

ruby -r webrick -e "s = WEBrick::HTTPServer.new(:Port => 9090, :DocumentRoot => Dir.pwd); trap('INT') { s.shutdown }; s.start"

---

Even the first command is hard to remember, so I just have this in my .bashrc:

function serve {
  port="${1:-3000}"
  ruby -run -e httpd . -p $port
}

It serves the current directory on port 3000 by default, but you can also specify the port:

~ $ cd tmp
~/tmp $ serve      # ~/tmp served on port 3000
~/tmp $ cd ../www
~/www $ serve 5000   # ~/www served on port 5000

Writing a simple webserver in Ruby

The problem appears to be in the child script, since the parent script in your question runs on my box (Debian Squeeze, Ruby 1.8.7 patchlevel 249):

I created the dummy child script bar.rb:

#!/usr/bin/ruby1.8

s = $stdin.read
$stderr.puts s
print s

I then ran your script, passing it the path to the dummy script:

$ /tmp/foo.rb /tmp/bar.rb

The I hit it with wget:

$ wget localhost:8080/index

And saw the dummy script's output:

GET /index HTTP/1.0^M
User-Agent: Wget/1.12 (linux-gnu)^M
Accept: */*^M
Host: localhost:8080^M
Connection: Keep-Alive^M
^M

I also saw that wget received what it sent:

$ cat index
GET /index HTTP/1.0
User-Agent: Wget/1.12 (linux-gnu)
Accept: */*
Host: localhost:8080
Connection: Keep-Alive

It worked the same no matter how many times I hit it with wget.

Rails: Running Multiple Ruby Scripts on a Server

The link in the comments to another question (by Smar, thanks):

http://railscasts.com/episodes/127-rake-in-background

seemed to work fine for me. I didn't need Foreman or any other tool.

I just needed to add this to the Rakefile:

desc "Start some other jobs"
task :start_other_jobs do
    system "ruby job1.rb &"
    system "ruby job2.rb &"
end

(note the ampersand to make it run as a background task)

and then start it by

rake start_other_jobs

Easy, isn't it? :D

How can I run a ruby script right after the server starts in Rails 5

Have you tried Foreman gem? It will allow you to create a simple file (Procfile) where you can specify all the process that should be started simultaneously.

I usually create a file named Procfile.dev in the project's root, that would look like for example:

web: bundle exec rails server thin start -p 4000
mail: mailcatcher -f
your_script: instructions

Then you start your Rails app as:

foreman start -f Procfile.dev

With that command, Foreman will execute all the processes on the file.

You should install the gem locally and not in the Gemfile.

Foreman Gem

---

Related Topics