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relistan / connect.rb
Last active Feb 16, 2022
Connecting to Cassandra/SSL from JRuby with Datastax driver
View connect.rb
def connect(addresses, dc_name)
builder = CqlSession.builder()
addresses.each do |a|
(host, port) = a.split(/:/)
port ||= 9042
.addContactPoint(, port.to_i))
.withAuthCredentials('[redacted]', '[redacted]')
relistan /
Created Sep 29, 2019
Crystal Lang Env Var Mapping
module EnvVar
# Fetch a key from the environment, or set a default if the key
# is missing. If the default is nil, abort and request that the
# required key be set.
def get_env(key : String, default : String?, nilable : Bool) : String?
rescue KeyError
if default.nil? && !nilable
abort "You must set a value for env var '#{key}'"

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relistan / env_var_provider.ex
Last active Dec 18, 2018
Elixir Distillery Env Var Provider
View env_var_provider.ex
defmodule EnvVar.Provider do
use Mix.Releases.Config.Provider
require Logger
def init(app: app, prefix: prefix, env_map: env_map) do
persist(app, prefix, env_map)
# E.g.
relistan / Dockerfile
Created Dec 5, 2017
Sidecar Envoy Docker container
View Dockerfile
FROM envoyproxy/envoy:v1.5.0
RUN apt-get update
COPY envoy.yaml /etc/envoy.yaml
View postgres_queries_and_commands.sql
-- show running queries (pre 9.2)
SELECT procpid, age(query_start, clock_timestamp()), usename, current_query
FROM pg_stat_activity
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
ORDER BY query_start desc;
-- show running queries (9.2)
SELECT pid, age(query_start, clock_timestamp()), usename, query
FROM pg_stat_activity
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'
relistan / blockingreader.go
Last active Sep 7, 2021
View blockingreader.go
package main
import (
package hello;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class MyApp1 {
final static Logger logger = LoggerFactory.getLogger(MyApp1.class);
private static void setDefaultUncaughtExceptionHandler() {
try {
relistan / kafkamon.scala
Created Mar 14, 2016
Kafka Offset Monitor
View kafkamon.scala
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
relistan / nitro_logback.lua
Created Jan 30, 2016
Logback standard output parser for Heka
View nitro_logback.lua
-- A Heka Decoder for a semi-standard logback entry
local os = require("os")
local lpeg = require("lpeg")
local dash = lpeg.P("-")
local colon = lpeg.P(":")
local space = lpeg.S(" \t")
local eol = lpeg.P(-1)