gregberns

# curl ~~Get gist raw url~~ > setup.sh
# chmod +x ~/setup.sh
# ~/setup.sh

GIT_USERNAME=________
GIT_EMAIL=________
GITHUB_ACCOUNT_NAME=________
MAC_USERNAME=________
MAC_MACHINE_NAME=________

gregberns

Programming Problem - Parse File

• Either read the "File Contents" from a file or place the text into a multi-line block
• Parse the contents
• Aggregate the time (last field)
• Report of total calls
• Report any error cases (non-200)
  • Bonus points: report what line number the error occured on

File Contents

gregberns

jq can filter keys with dashes (-), but that requires special syntax: [\"field-name\"]

Input:

echo '{"the-long-field-name":"true"}' | jq ". | select(.[\"the-long-field-name\"] != null)"

Output:

gregberns

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

gregberns

Notes from 2019-04-24 PHX DevOps meetup

Managing Secrets

NoDramaDevOps.com Blog

Platform Identity
* Can give a VM a service account which has rights to access 

* Use short term credentials to talk between services.

gregberns

fn partition<A,B>(list: Vec<Result<A,B>>) -> (Vec<A>, Vec<B>) {
    let mut aa = vec!();
    let mut bb = vec!();
    for i in list {
        match i {
            Ok(a) => aa.push(a),
            Err(b) => bb.push(b),
        };
    }
    (aa, bb)

gregberns

UniVerse Change Data Capture File Format

Below is a proposed data format to send UniVerse database changes via file. It uses standard UNIX delimiters for new lines, and standard UniVerse characters to deliniate fields (ASCII code 254 (þ)) and data (ASCII code 253 (ý)).

Example:

src=cssþns=CONTRACTSþts_ms=1550549470126þuid=12345678þop=uþdata=ý_id=1234ýname=Bobýþ
src=cssþns=CONTRACTSþts_ms=1550549470126þuid=12345678þop=uþdata=ý_id=1234ýname=Simonýþ

gregberns

module Lib
  ( someFunc
  ) where

{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE OverloadedStrings #-}

import           Hedgehog
import qualified Hedgehog.Gen as Gen
import qualified Hedgehog.Range as Range

gregberns

interface Integer2Integer {
  int apply(int n); 
}
static int blah(Integer2Integer r) { return r.apply(99); }
class Plus10 : Integer2Integer { Integer2Integer { int apply(int n) { return n + 10; } }
Console.WriteLine(blah(new Plus())); // what does that print?

maybe even a type alias
type Integer2Integer = Int -> Int
blah r = r 99

gregberns

Thanks to @user#0540 and @Globi#0117 on the #beginners discord

Question: Coming from JS/C#/Haskell and trying to understand the & and * a bit better. In this code snippet, the n in the lambda apparently can either be |&n| n%2==0 or |n| *n%2==0. Could some one explain this a bit better? I think its something to do with reference/defreferece, but still not comfortable with those ideas.

let arr: [u16; 5] = [1, 2, 3, 4, 5];
let mut iterator = arr.iter().filter(|&n| n%2==0);