dovys

package main

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"net/http"
	"os"
	"strconv"
	"strings"

dovys

apiVersion: v1
kind: ConfigMap
metadata:
  labels:
    product: k8s-elastic
  name: elastic-config
data:
  elasticsearch.yaml: |
    discovery.type: single-node

dovys

$ ssh -A vm
$ git config --global url."git@github.com:".insteadOf "https://github.com/"
$ cat ~/.gitconfig
[url "git@github.com:"]
	insteadOf = https://github.com/
$ go get github.com/private/repo && echo Success!
Success!

dovys

SHELL = /bin/bash
MAKEFLAGS=-s
BINARY = mboard
TEST_DIRECTORIES = ./handlers ./services

$(BINARY):
	go build -o $(BINARY)
	echo "Binary:" $(CURDIR)/$(BINARY)

install:

dovys

Latency Comparison Numbers
--------------------------
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

dovys

BenchmarkIsPalindrome5Chars-8       	100000000	        19.8 ns/op
BenchmarkIsPalindrome10Chars-8      	50000000	        27.2 ns/op
BenchmarkIsPalindrome20Chars-8      	30000000	        48.1 ns/op
BenchmarkIsPalindrome40Chars-8      	20000000	       112 ns/op
BenchmarkIsPalindrome80Chars-8      	 5000000	       337 ns/op
BenchmarkIsPalindromeFalsy-8        	100000000	        13.8 ns/op
BenchmarkIsPalindromeFalsyVeryLong-8	 2000000	       709 ns/op

dovys

webapp/OAuth2/REST API stack security checklist

OAuth2 (implicit flow)

• response_type is a constant set for particular app on server (1)
• redirect_uri, too (1)
• "state" parameter is echoed by server and checked by client (1)
• hash of "state" parameters is stored in LocalStorage and destroyed on receiving redirect (1)
• "client_id" parameter is checked (after obtaining token, make a request to server to get "token_id" for this token and compare to existing one) (2, 3)
• IP is saved for particular token on grant and checked on access

dovys

#!/bin/bash

if [ -z "$1" ]; then echo "Usage: $0 database"; exit 0; fi

schema_dir='/code/in/schema/'
migrations=$(find $schema_dir -name '*-GROUPS*.sql')

for migration in $migrations; do
    echo "UNDOING" $migration
    sql=$(sed -n '/@UNDO/ { s///; :a; n; p; ba; }' $migration)