| I have a web app that needs to talk to point of sale hardware: receipt printers, customer displays, | |
| cash drawers and payment terminals. Direct communication from the web app with these devices is | |
| impossible, so I created a native app that can be installed on the computer that can talk to the | |
| devices. The app runs a web server that exposes these devices using a REST api. | |
| The native app registers itself upon startup with a webservice. It sends its own IP address on | |
| the local network and the server also sees the external IP address of the network. The web app | |
| sends a discovery request to the webservice and it receives all the local IP addresses which | |
| have the same external IP address. |
| import code; code.interact(local=dict(globals(), **locals())) |
| ## drop this in the new file /etc/sudoers.d/sudoers-vagrant | |
| ## add add your user to the vagrant group | |
| Cmnd_Alias VAGRANT_EXPORTS_ADD = /usr/bin/tee -a /etc/exports | |
| Cmnd_Alias VAGRANT_NFSD_CHECK = /usr/bin/systemctl status nfs-server | |
| Cmnd_Alias VAGRANT_NFSD_START = /usr/bin/systemctl start nfs-server | |
| Cmnd_Alias VAGRANT_NFSD_APPLY = /usr/sbin/exportfs -ar | |
| Cmnd_Alias VAGRANT_EXPORTS_REMOVE = /bin/sed -r -e * d -ibak /etc/exports | |
| %vagrant ALL=(root) NOPASSWD: VAGRANT_EXPORTS_ADD, VAGRANT_NFSD_CHECK, VAGRANT_NFSD_START, VAGRANT_NFSD_APPLY, VAGRANT_EXPORTS_REMOVE |
Sometimes you need to iterate over a ton of items and you don't want the overhead of creating AR objects out of all of them. Hell, you only need a few things! Well, #pluck has your back.
But what if you want to iterate over many tonnes of items?
Pluck in batches to the rescue!
Enjoy!
| #!/usr/bin/env ruby | |
| require 'ruby-jmeter' | |
| test do | |
| defaults domain: 'beta.stevegrossi.com' | |
| cookies clear_each_iteration: true |
| namespace :searchkick do | |
| desc "maybe reindex without running out of memory?" | |
| task :altindex, [:start_index, :batch_size, :new_index_name] => :environment do |t, args| | |
| ActiveRecord::Base.logger = Logger.new(STDOUT) | |
| count = Item.count | |
| start = args[:start_index].to_i || 0 | |
| batch_size = args[:batch_size].to_i || 1000 | |
| # we create a new index or take one already present | |
| if args[:new_index_name] |
SSH into Root
$ ssh root@123.123.123.123
Change Root Password
| require 'benchmark' | |
| ActiveRecord::Base.logger = nil | |
| Benchmark.bmbm do |bench| | |
| bench.report("SQL query") do | |
| 1000.times { Whatever.count } | |
| end | |
| bench.report("exception hit") do |
| #!/usr/bin/ruby | |
| # | |
| # This scipt is designed to work with mock 1.2.0+ | |
| require 'uri' | |
| require 'shellwords' | |
| class Mock | |
| attr_reader :root | |
| log/ |
