Peter Boling pboling

How to create a Ruby gem that adds Rake tasks

Create a gem

One way to do this is to use bundler to scaffold our gem:

bundler gem my_gem

Add rake tasks to our gem

I prefer to put tasks meant to manage the gem itself in lib/tasks, and tasks the gem is meant to provide to gem users in lib/my_gem/tasks.

Retry count	Retry Time	Total Cumulative Time	Total Cumulative Days
0	0:00:00	0:00:00	0.0
1	0:00:16	0:00:16	0.0
2	0:00:31	0:00:47	0.0
3	0:01:36	0:02:23	0.0
4	0:04:31	0:06:54	0.0
5	0:10:40	0:17:34	0.0
6	0:21:51	0:39:25	0.0
7	0:40:16	1:19:41	0.1
8	1:08:31	2:28:12	0.1

Long story short, Celluloid versions 0.17+ have a memory leak.

The Reason behind this is that completed Celluloid threads are never cleaned up.

We have discovered that our Sidekiq process is leaking memory when we have a lot of tasks that were failed because of exceptions. Unfortunately, having a lot of failed tasks is specific for our application — we do have a lot of small queued jobs to work with social network APIs and other external services.

You can reproduce the problem with this: https://gist.github.com/gazay/3aa78e515ab05cb79f76

RailsConf 2015 Schedule

RailsConf 2015 Room 202 Day 1

	<script lang="ts">
	import type { UserView } from '$lib/stubs/auth';
	import { getContext, onMount } from 'svelte';
	import { goto } from '$app/navigation';
	import { getContacts } from '$lib/repositories/contacts';
	import { browser } from '$app/environment';
	import { CONTACTS_STORE_KEY, USER_STORE_KEY } from '$lib/store-keys';
	import type { Writable } from 'svelte/store';
	import AddContactButton from '$lib/components/Contacts/AddContact/AddContactButton.svelte';
	import { db } from '$lib/surrealdb';

	module HashDelegate

	# Like `delegate :foo, to: :bar` only for hashes instead
	# of objects. So these are the same:
	#
	# def foo
	# bar[:foo]
	# end
	#
	# hash_delegate :foo, to: :bar

	<script context="module">
	import { get, readable } from 'svelte/store'

	import { createClient, operationStore } from '@urql/svelte'

	import { browser, dev } from '$app/env'

	/**
	* @type {import('@sveltejs/kit').Load}
	*/

	task :generate_engine do
	# Get name sent from console
	name = ENV['name'].downcase

	# Store useful paths
	engine_path = "engines/#{name}"
	dummy_path = 'spec/dummy'
	lib_files_path = 'lib/tasks/files'
	dummy_relative_path = "#{engine_path}/#{dummy_path}"

	begin
	require "bundler/inline"
	rescue LoadError => e
	$stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
	raise e
	end

	gemfile(true) do
	source "https://rubygems.org"

	Sidekiq.configure_server do \|config\|
	ENV["SIDEKIQ_NAMESPACE"] && config.options[:namespace] = ENV["SIDEKIQ_NAMESPACE"]
	ENV["SIDEKIQ_CONCURRENCY"] && config.options[:concurrency] = ENV["SIDEKIQ_CONCURRENCY"].to_i
	ENV["SIDEKIQ_VERBOSE"] && config.options[:verbose] = ENV["SIDEKIQ_VERBOSE"] === 'true'
	ENV["SIDEKIQ_LOGFILE"] && config.options[:logfile] = ENV["SIDEKIQ_LOGFILE"]
	ENV["SIDEKIQ_PIDFILE"] && config.options[:pidfile] = ENV["SIDEKIQ_PIDFILE"]

	config.options[:strict] = true

	if ENV["SIDEKIQ_QUEUES"]