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Simon Eskildsen sirupsen

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sirupsen / queuing.rb
Created Feb 14, 2020
Queuing theory exercise
View queuing.rb
class Node
attr_accessor :edges, :jobs, :id
def initialize(id, arrivals_per_tick)
@id = id
@jobs = 0.0
@tick = 0
@edges = []
@arrivals_per_tick = arrivals_per_tick
end
View zettelkasten-search.rb
require "sqlite3"
require 'set'
require 'byebug'
# Will be rebuilt at any time. Nice and incremental.
db = SQLite3::Database.new "index.db"
# Keep prefix indexes for "mos*" searches.
#
# TODO: It doesn't seem like SQLITE FTS5 supports synonyms well. That's ok, but
# we're going to want that. We can download this database from Princeton, write
View black_box.rs
use std::io::{Read, Seek, SeekFrom, Write};
use std::slice;
use std::time::Instant;
use std::{fs::OpenOptions, io::Result};
use std::ptr;
use std::mem::forget;
const BUF_SIZE: usize = 1024 * 32;
const FILE_SIZE: usize = 1024 * 1024 * 512;
const QUEUE_DEPTH: usize = 32;
View sequantial_io.rs
use std::{fs::OpenOptions, io::Result};
use std::io::{Read, Write, Seek, SeekFrom};
use std::slice;
use std::time::Instant;
const BUF_SIZE: usize = 1024 * 32;
const FILE_SIZE: usize = 1024 * 1024 * 512;
const QUEUE_DEPTH: usize = 32;
fn main() -> Result<()> {
@sirupsen
sirupsen / ping_less.rb
Created Mar 7, 2019
Ping less patch for MySQL.
View ping_less.rb
# frozen_string_literal: true
# By default, ActiveRecord will issue a PING command to the database to check
# if it is active at various points. This overhead is unnecessary; we instead
# attempt to issue queries without checking the connection, then if the query
# returns an error and the connection was closed, try to reconnect.
# This also allows for reconnection during a single UoW, improving resiliency
# under transient connection failure (e.g. ProxySQL restarts).
#
# To avoid amplifying load when a database is intermittently down, the attempt
@sirupsen
sirupsen / book.rb
Last active May 15, 2020
Script to import books from Instapaper to Airtable. Will not work out of the box.
View book.rb
class Book < Airrecord::Table
class Endorser < Airrecord::Table
self.base_key = ""
self.table_name = "Endorser"
end
self.base_key = ""
self.table_name = "Books"
has_many :endorsements, class: 'Book::Endorser', column: 'Endorsements'
@sirupsen
sirupsen / setup.sh
Last active Aug 29, 2015
Script to set up development environment for ngx-lua
View setup.sh
WORKDIR="/home/vagrant/src"
clone_repo() {
local name=$1; shift
local repo=$1; shift
if [[ ! -d "$WORKDIR/$name" ]]; then
View gist:f3111d7f12f9d736d68a
def load_customer
if customer_id = session[:customer_id]
@customer = Customer.find_by_id(session[:customer_id])
end
# in reality e.g. a redis exception thrown from the driver
# could be raised from circuit breaker or semian as well (see later)
rescue Sessions::DataStoreUnavailable
flash[:notice] = 'Customer sign in is currently unavailable'
@customer = nil
end
View gist:44f6c7293f25cf69382d
def test_storefront_resilient_to_sessions_down
Toxiproxy[:sessions_data_store].down do
get '/'
assert_equal 'Customer sign in is currently unavailable', flash[:notice]
assert_response :success
end
end
View gist:3b3762c74355f42ac7bc
def load_customer
if customer_id = session[:customer_id]
@customer = Customer.find_by_id(customer_id)
end
end
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