sitano

package main

import "fmt"

type S struct {
	b [8]byte
}

func keys(m map[S]struct{}) [][]byte {
	var z [][]byte

sitano

package main

import "fmt"

type S struct {
	b [8]byte
}

func main() {
	mmap := map[S]struct{}{

sitano

Level 0

ssh [email protected] -p 2221

password: eatmyshorts flag: aesebootiv hint: password is protected by the xor func memfrob from <string.h>

> memfrob - frobnicate (encrypt) a memory area

sitano

#include <stdio.h>
#include <stdlib.h>

int main(void)
{
  int* p = (int *)malloc(sizeof(int));
  int* q = (int *)realloc(p, sizeof(int));
  *p = 1;
  *q = 2;
  if (p == q)

sitano

package main

import "fmt"

type res struct {
	s []byte
	l int
	r int
}

sitano

What to do when replica creation fails stopping streaming, trying to recover WAL from the archive

Calculate XLOG entries distance between master and replica with:

on master:

> select pg_xlogfile_name(pg_current_xlog_flush_location()), pg_current_xlog_insert_location(), pg_current_xlog_location();

on slave:

sitano

-- Create a group
CREATE ROLE readonly WITH LOGIN;

-- Grant access to existing tables
GRANT USAGE ON SCHEMA public TO readonly;
GRANT SELECT ON ALL TABLES IN SCHEMA public TO readonly;

-- Grant access to future tables
ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO readonly;

sitano

package main

import (
	"flag"
	"log"
	"math/rand"
	"net/http"
	"time"
)

sitano

// Ivan Prisyazhnyy <[email protected]>, 2017
//
// Ambiguities:
// - "URL syntax correctness" is not explicitly defined. Should, I
//   interpret it, like it has to match rfc1738/rfc3986? I will go
//   with the simplest solution - URL is valid if parsed by util.URL.
// - Various behaviors for edge cases (i.e. meeting bad data, unstable
//   network, too much data) are not well defined. If external service
//   returns 4/5xx code, it could be retried and etc.
// - Answering always within 500 milliseconds - this is the biggest

sitano

location = /status {
    default_type text/plain;

    content_by_lua '
        local ok, upstream = pcall(require, "ngx.upstream")
        if not ok then
            error("ngx_upstream_lua module required")
        end

        local get_primary_peers = upstream.get_primary_peers