blakejakopovic

Nostr Client App Anti-Patterns

With Nostr being an open protocol, and client apps being able to be developed by anyone, it's important that the client apps design around best supporting relays by minimising their client app impact. Remember, if your app has 10,000+ users, and the app's relay interaction code makes relays slower - everyone suffers.

Below are some anti-patterns (things not to do), that can help with relay performance, and ultimately make your client apps faster!

Please help build upon this list - we can move to a repo.. just add comments for now.

• Updating a subscription too often (triggers new SQL queries)
• Connecting to a relay multiple times (use a single websocket)

blakejakopovic

-- The goal of this script is to trim messages that have been processed by
-- all extant groups from the a given Redis stream. It returns the number
-- of messages that were deleted from the stream, if any. I make no
-- guarantees about its performance, particularly if the stream is large
-- and not fully processed (so a simple XTRIM isn't possible).

-- First off, bail out early if the stream doesn't exist.
if redis.call("EXISTS", KEYS[1]) == 0 then
  return false
end

blakejakopovic

#!/usr/bin/env ruby

def hex_to_bytes(s)
  s.scan(/.{1,2}/).map{|b| b.to_i(16)}
end

def zero_bits(b)
    n = 0

    if b == 0

blakejakopovic

How to download your Udemy course videos using youtube-dl

$ youtube-dl --list-extractors | grep udemy

Steps

1. Get link to the course to download. e.g. https://www.udemy.com/course-name/
2. Login into udemy website, save the cookie from chrome using Chrome (Cookie.txt)[1] export extension. Save it to file udemy-cookies.txt
3. Get the link of the video that you want to download. usually in format. Use the command provided below where you have to replace the {course_link} and {path_to_cookies_file} with respective paths.

$ youtube-dl {course_link} --cookies {path_to_cookies_file}

blakejakopovic

Translations

Summary

• The Bitcoin Core GUI can be easily translated into other languages
• We use Transifex to manage all translations (Bitcoin Project)
• The languages manifest file can be found at src/qt/bitcoin.qrc
• Translation source files are located in src/qt/locale/
• .ts files are generated translation source files
• .qm files are compiled binary translation files

blakejakopovic

#include "firmata-spark/firmata-spark.h"

TCPServer server = TCPServer(5678);
TCPClient client;

bool new_client = true;

void setup()
{
  // start listening for clients

blakejakopovic

(defn parse-message
  "Parses incoming data and emits valid messages"
  []
  (let [data (js/Buffer 0)]
    (fn [emitter buffer]

      ;; Append new data to buffer
      (set! data (.concat js/Buffer [data buffer]))

      ;; Remove incomplete messages (ie. not control charactors)

blakejakopovic

float a =  6.7;
float b = 14.6;
float c = 26.3;

byte* method1(float num)
{
  byte buff[sizeof(float)];
  memcpy(buff, &num, sizeof(float));

  return buff;

blakejakopovic

(ns testdrive.example 
  (:require [firmata.core   :refer [open-board event-channel]]
            [firmata.stream :refer [FirmataStream]]
            [cljs.nodejs    :as nodejs])

(def net (nodejs/require "net"))

(defrecord SocketStream [host port]
  FirmataStream

blakejakopovic

#include "firmata-spark/firmata-spark.h"

TCPServer server = TCPServer(5678);
TCPClient client;

bool new_client = true;

void setup()
{
  // start listening for clients