databento-bot

#!/usr/bin/env python

# Building high-frequency trading signals in Python with Databento and sklearn
#
# This is a simple example that demonstrates how to build high-frequency trading signals in Python,
# using order book and market depth data from [Databento](https://databento.com) together with
# machine learning models from [sklearn](https://scikit-learn.org/).

import databento as db
import numpy as np

manuelbl

ESP32 as Bluetooth Keyboard

With its built-in Bluetooth capabilities, the ESP32 can act as a Bluetooth keyboard. The below code is a minimal example of how to achieve it. It will generate the key strokes for a message whenever a button attached to the ESP32 is pressed.

For the example setup, a momentary button should be connected to pin 2 and to ground. Pin 2 will be configured as an input with pull-up.

In order to receive the message, add the ESP32 as a Bluetooth keyboard of your computer or mobile phone:

1. Go to your computers/phones settings
2. Ensure Bluetooth is turned on

F21

This is a quick guide of the commands we use to sign someone's GPG key in a virtual key signing party.

Note: The steps cover only the technical aspects of signing someone's key. Before signing someone's key, you must verify their identity. This is usually done by showing government-issued ID and confirming the key's fingerprint

The commands will work for both GPG and GPG2.

I use Julian's key for the examples. His key id is 2AD3FAE3. You should substitute with the appropriate key id when running the commands.

Signing the key

1. List the keys currently in your keyring: gpg --list-keys.

ladinu

Requirements

1. Encrypt everthing including /boot and /root
2. Enter password once
3. Support UEFI

Installation media setup

Download NixOS minimal iso and copy to USB stick. For example on Mac OSX

$ diskutil list
$ diskutil unmountDisk /dev/disk1 # Make sure you got right device

miguelmota

# Generate the private and public keys
openssl ecparam -name secp256k1 -genkey -noout | openssl ec -text -noout > key

# Extract the public key and remove the EC prefix 0x04
cat key | grep pub -A 5 | tail -n +2 | tr -d '\n[:space:]:' | sed 's/^04//' > pub

# Extract the private key and remove the leading zero byte
cat key | grep priv -A 3 | tail -n +2 | tr -d '\n[:space:]:' | sed 's/^00//' > priv

# Generate the hash and take the address part

mayorova

Securing traffic to upstream servers with client certificates

Info: https://www.nginx.com/resources/admin-guide/nginx-https-upstreams/

Creating and Signing Your Certs

Source: http://nategood.com/client-side-certificate-authentication-in-ngi

This is SSL, so you'll need an cert-key pair for you/the server, the api users/the client and a CA pair. You will be the CA in this case (usually a role played by VeriSign, thawte, GoDaddy, etc.), signing your client's certs. There are plenty of tutorials out there on creating and signing certificates, so I'll leave the details on this to someone else and just quickly show a sample here to give a complete tutorial. NOTE: This is just a quick sample of creating certs and not intended for production.

vladholubiev

digraph architecture {
  rankdir=LR;

  // Storage - #303F9F (dark blue)
  node[fillcolor="#303F9F" style="filled" fontcolor="white"];
  database[label="DB"]; cache[label="Redis"];
  
  // Client-side Apps - #FFEB3B (yellow)
  node[fillcolor="#FFEB3B" style="filled" fontcolor="black"];
  front_end[label="Front-end App"]; extension[label="Browser Extension"];

mjnaderi

Installing Arch Linux with Full Disk Encryption

If you're aiming for a seamless Arch Linux installation in UEFI mode, follow along as this guide will walk you through the process step by step. We'll be using LUKS (Linux Unified Key Setup) and LVM (Logical Volume Manager) partitions on LUKS to achieve full disk encryption.

Note: I have updated this doc for UEFI mode. For those with BIOS/MBR systems, you can refer to the previous version, but keep in mind that it might be outdated and no longer accurate.

If you're only interested in installing Linux and not setting up dual boot with Windows, feel free to skip the Windows-related sections.

bradymholt

#!/usr/bin/env node

var fs = require('fs');
var args = fs.readFileSync(process.argv[2], 'utf8');
var changed = false;

var jsonPath = null;
var json = null;
var keyValReplacementString = args.split(' ');
keyValReplacementString.forEach(function(i){

smoya

• Enable the tracer on your xdebug.ini file (see the xdebug.ini file).
• If you are gonna trace an http request, make sure your xdebug.trace_output_dir is writable by the webserver user (www-data).
• Execute your script or your request. You can use produce_segmentation.php to test.
• See the trace file(s) on your xdebug.trace_output_dir.