I want to log user's ip address, referer, and user agent.
In PHP, I can get them from the following variables:
$_SERVER['REMOTE_ADDR']
$_SERVER['HTTP_REFERER']
$_SERVER['HTTP_USER_AGENT']
How to get them in ruby?
PHP is embedded in a web server. Ruby is a general-purpose language: if you need a web server context, you'll have to install it yourself. Fortunately, it's easy.
One of the easiest ways to get started is with Sinatra. Install the gem:
gem install sinatra
Then create myapp.rb:
require 'sinatra'
get '/' do
request.user_agent
end
Start up the web server:
ruby -rubygems myapp.rb
Visit Sinatra's default URL: http://localhost:4567/
Et voilà.
You need the array request.env
request.env['REMOTE_ADDR']:
I'm assuming you by ruby you mean ruby on rails, the following link shows you how to access them:
http://techoctave.com/c7/posts/25-rails-request-environment-variables
Related
I'm using nginx to run a ruby script. I've already set up the nginx config correctly as it works with php-fpm
In php I set
header('X-Accel-Redirect, file_path)
Is there an equivalent for it in ruby.
I have tried it with
cgi = CGI.new
cgi.out( "X-Accel-Redirect" => new_file)
But it doesn't seem to work...
Is any any gem that I could include.
I'm new to ruby. any help would be highly appreciated.
Assuming you are using a Rack application (Rails, Sinatra, Padrino etc.) the same way you used your php-fpm apps (i.e. behind Nginx as a reverse proxy), you should be able to do the same thing you did in PHP:
response['X-Accel-Redirect'] = file_path
I'm trying to configure my Rack app to use Memcache for sessions with Rack::Session::Memcache
How do I give it the options (such as server, username and password)?
Presently I have
use Rack::Session::Memcache
But I get the error
in `initialize': No memcache servers (RuntimeError)
Heroku has put the config in environment variables
MEMCACHE_PASSWORD:
MEMCACHE_SERVERS:
MEMCACHE_USERNAME:
I know I can get these in Ruby with ENV['MEMCACHE_PASSWORD'] but I don't know how to give them to Rack::Session::Memcache
Edit: or to Rack::Session::Dalli that would be great too https://github.com/mperham/dalli
This config worked for Heroku, Dalli is clever and knows to look in the environment variables
require 'dalli'
require 'rack/session/dalli'
use Rack::Session::Dalli, :cache => Dalli::Client.new
After reading the source code at https://github.com/mperham/dalli/commit/4ac5a99
I want to access request in the Rack::ResponseHeaders. I am using Sinatra in my app.
Below is my code:
use Rack::ResponseHeaders do |headers|
# Manipulation of request variables.
# Setting request headers.
end
The question is that in order to manipulate variables in request, I need to have the request variable first.
Please suggest.
First thing is, you need to install the gem rack-contrib via rubygems:
$ gem install rack-contrib
This gem contains contributed rack utilities. Then you need to require this gem in your app:
require 'rack/contrib'
It may be enough to only require the response headers utility (not tested):
require 'rack/contrib/response_headers'
Then you can use this utility to tap into the headers, for example:
use Rack::ResponseHeaders do |headers| # tap into headers
unless headers['cache-control'] # if header not set,
headers['cache-control'] = "public, max-age=1800" # set it to ...
end
end
Let me know whether this is working for you.
(GAVE UP ON INSTALLING CURB. POSTED NEW QUESTION PER SUGGESTION OF ONE OF THE RESPONDENTS)
I thought 'curl ' was 'built-in' but got an undefined method error in a sinatra app. is there a gem i need to add?
Same question for rails 3?
The application is that I have to simply 'hit' an external url (http://kickstartme.someplace.com?action=ACTIONNAME&token=XYZXYZXYZ) to kickstart a remote process.
the external url returns XML describing success/failure in the format:
<session>
<success>true</success>
<token>xyzxyzxyz</token>
<id>abcabcabc</id>
</session>
So really, ALL I need is for my rails and sinatra apps to hit that url and parse whatever is returned AND grcefully handle the remote server failing to reply.
require 'open-uri'
require 'nokogiri'
response = open("http://kickstartme.someplace.com?action=ACTIONNAME&token=XYZXYZXYZ").read
doc = Nokogiri::XML(response)
Use curb, a Ruby binding to libcurl. You will get all the curl features without having to shell out with system.
curl -b "auth=abcdef; ASP.NET_SessionId=lotsatext;" example.com
turns into
curl = Curl::Easy.new('http://example.com/')
curl.cookies = 'auth=abcdef; ASP.NET_SessionId=big-wall-of-text;'
curl.perform
More curb examples
I need to write a super fast Ruby application to process web requests on Sinatra - and want to run it on the Ebb webserver. But I cannot work out how to do this. Could someone please help me?
sinatra has a -s option to specify a handler. try running your app with -s ebb.
You need to look at Rack: http://rack.rubyforge.org/
It's pretty easy really, you have a .ru file which instructs Rack how to start your application, and in your application you have a 'call' method which is called on each request, and sends the response back to Rack.
In my_app.ru
require 'my_app'
require 'ebb'
# Rack config
use Rack::Static, urls: ['/js', '/public', '/index.html']
use Rack::ShowExceptions
# Run application
run MyApp.new
In my_app.rb
class MyApp
def call env
request = Rack::Request.new env
response = Rack::Response.new
params = request.params
response.body = "Hello World"
response['Content-Length'] = response.body.size.to_s
response.finish
end
end
Then you specify the .ru file in your sinatra config, like:
rackup: my_app.ru