wudi

HTTP Streaming (or Chunked vs Store & Forward)

The standard way of understanding the HTTP protocol is via the request reply pattern. Each HTTP transaction consists of a finitely bounded HTTP request and a finitely bounded HTTP response.

However it's also possible for both parts of an HTTP 1.1 transaction to stream their possibly infinitely bounded data. The advantages is that the sender can send data that is beyond the sender's memory limit, and the receiver can act on

wudi

const SPEEEEEED: bool = 1==1;


pub mod reg {

    #[derive(Clone, Copy, Debug)]
    #[repr(align(4))]
    pub enum Instruction {
        LoadInt     { dst: u8, value: i16 },

wudi

# source: https://numbers.brighterplanet.com/2012/08/21/how-to-parse-quotes-in-ragel/

examples = [
  %{''},
  %{""},
  %{' '},
  %{" "},
  %{'A'},
  %{'ABC'},
  %{'AB C'},

wudi

JQ to filter JSON by value

Syntax: cat <filename> | jq -c '.[] | select( .<key> | contains("<value>"))'

Example: To get json record having _id equal 611

cat my.json | jq -c '.[] | select( ._id | contains(611))'

Remember: if JSON value has no double quotes (eg. for numeric) to do not supply in filter i.e. in contains(611)

wudi

Bash Shortcuts

Moving

command	description
ctrl + a	Goto BEGINNING of command line

wudi

version: '2.4'
services:
  kafka:
    image: bitnami/kafka:3.1.0
    container_name: kafka
    command:
      - 'sh'
      - '-c'
      - '/opt/bitnami/scripts/kafka/setup.sh && kafka-storage.sh format --config "$${KAFKA_CONF_FILE}" --cluster-id "lkorDA4qT6W1K_dk0LHvtg" --ignore-formatted  && /opt/bitnami/scripts/kafka/run.sh' # Kraft specific initialise
    environment:

wudi

#!/bin/sh
#
# CloudFlare Dynamic DNS
#
# Updates CloudFlare records with the current public IP address
#
# Takes the same basic arguments as A/CNAME updates in the CloudFlare v4 API
# https://www.cloudflare.com/docs/client-api.html#s5.2
#
# Use with cron jobs etc.

wudi

import (
  "fmt"
  "io"
  "os"
)

/*
   GoLang: os.Rename() give error "invalid cross-device link" for Docker container with Volumes.
   MoveFile(source, destination) will work moving file between folders
*/

wudi

Moved to git repository: https://github.com/denji/golang-tls

Generate private key (.key)

# Key considerations for algorithm "RSA" ≥ 2048-bit
openssl genrsa -out server.key 2048

# Key considerations for algorithm "ECDSA" ≥ secp384r1
# List ECDSA the supported curves (openssl ecparam -list_curves)

wudi

// Node v6.9.0

//
// TEST FILE (cut down for simplicity)
// To ensure Golang encrypted string can be decrypted in NodeJS.
//

let crypto;
try {
  crypto = require('crypto');