Skip to content

Instantly share code, notes, and snippets.

View nevans's full-sized avatar

nicholas a. evans nevans

69 followers · 63 following
View GitHub Profile
@nevans
nevans / http_connection_bm.rb
Last active August 29, 2015 14:00
HTTP with or without TCP_NODELAY (client or server)
require "benchmark"
require "typhoeus"
require "excon"
require "net/http/persistent"
reps = ENV.fetch("HTTP_BM_REPS", 1000).to_i
url = ENV.fetch("HTTP_BM_URL", "http://localhost:5984/")
nodelay = ENV.fetch("HTTP_BM_NODELAY", "true") == "true"
Excon.defaults[:tcp_nodelay] = nodelay
@nevans
nevans / verify_and_decrypt_session_cookie.rb
Last active November 22, 2024 13:40
Rails 5.2.4: verifying and decrypting session cookies, to be used from rails console or in a script with the rails application loaded
@nevans
nevans / in_root_fiber.rb
Last active October 27, 2020 05:03
# frozen_string_literal: true
require "fiber" # needed for transfer
RootFiberException = Class.new(Exception)
RootFiberTestSignal = Class.new(RootFiberException)
# Warning: this is only safe to call from the root fiber for a thread.
# Unfortunately, your code may not know if it is in the root fiber. This will
# raise an exception in the root fiber of the current thread. If you are in the
@nevans
nevans / bundle-show-dates-bundler1.sh
Created November 21, 2020 14:48
#!/usr/bin/env bash
set -eo pipefail
bundle show |
grep -v '^Gems' |
sed 's/^ \* \|(\|)//g' |
while read -r line; do
gemname=$(echo "$line" | cut -f1 -d" ")
version=$(echo "$line" | cut -f2 -d" ")
gitsha1=$(echo "$line" | cut -f3 -d" ")
@nevans
nevans / IMAP-RFCs.md
Last active December 19, 2024 09:50
IMAP Specifications

IMAP specifications

(TODO) All IANA registered IMAP capabilities, response codes, keywords, mailbox attributes, the most relevant SASL mechanisms, and other relevant specifications.

  • ⛔️: obsolete specifications that have been deprecated or replaced
  • ⏭️: extensions that have been completely or partially included in [IMAP4rev2].
  • ✨: extensions that are recommended for [IMAP4rev2] servers and clients. The IETF EXTRA WG decided that requiring them as a part of IMAP4rev2 would push the bar to implement too high for new implementations.
  • 🗑: extensions that have been completely or partially deprecated or removed in [IMAP4rev2].
  • 🍋: extensions that are included in the "Lemonade" profile [RFC5550].
@nevans
nevans / ruby_priority_queues.txt
Last active March 24, 2021 17:27
Benchmarks for some pure ruby priority queue implementations
# Run on an Intel(R) Core(TM) i7-1065G7
# using ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-linux]
# n.b. when running these benchmarks, I did not shut down other
# processes (including web browser) nor did I run the benchmark
# multiple times (using "--repeat-count"). The numbers would be
# slightly faster and more stable/reliable if I'd done that.
# Maybe (maybe) I'll re-run them later.
Warming up --------------------------------------
@nevans
nevans / rfc9051-syntax.abnf
Last active June 17, 2022 18:46
RFC-9051 Formal Syntax
TEXT-CHAR = %x01-09 / %x0B-0C / %x0E-7F
; <any CHAR except CR and LF>
; %x01-09 / %x0B-0C / %x0E-7F
any-TEXT-CHAR-except-quoted-specials = %x01-09 / %x0B-0C / %x0E-21 / %x23-5B / %x5D-7F
; <any TEXT-CHAR except quoted-specials>
; '"' = %x22
; '\' = %x5C
ATOM-CHAR = %x21 / %x23-24 / %x26-27 / %x2B-5B / %x5E-7A / %x7C-7E
@nevans
nevans / ractor_shenanigans.rb
Last active August 24, 2022 18:27
freezing procs
# frozen_string_literal: true
# requires ruby 3.1+
# Ractor.make_shareable(proc) only succeeds if everything on the proc's binding is shareable.
#
# This makes it difficult to create wrappers around Ractor.new that accept an arbitrary block.
# Even this would still require the block declare any outer variables as block-locals, even if
# they aren't used.
class ProcFreezer
def initialize = freeze