relistan

Cassandra Migration With Keyspace Creation

The problem this solves: Golang-migrate supports Cassandra migrations but does not support creating the keyspace itself. This is annoying and leads to having to wrap it with other tooling or scripting to actually use it. Additionally, when running locally, Cassandra or ScyllaDB can take a fair bit of time to start. This tool solves that problem as well. It:

• Creates keyspaces if they are missing before running the migrations
• Checks and retries for up to a couple of minutes waiting for Cassandra to be available

relistan

#!/usr/bin/env ruby

# This script accepts a blob of XML on ARGF/stdin like the following, and
# downloads the jar to the current directory.
#
# <dependency>
#   <groupId>com.datastax.cassandra</groupId>
#   <artifactId>cassandra-driver-core</artifactId>
#   <version>3.0.8</version>
#   <classifier>shaded</classifier>

relistan

CAT Control on the (tr)uSDX for WSJT-X on macOS

This will enable CAT control on your Mac running WSJT-X with the (tr)uSDX and possibly other USDX rigs as well. WSJT-X uses Hamlib to connecto to and manage CAT on different radios. The problem (thanks to Guido PE1NNZ for identifying), is that Hamlib resets the port when it connects. This causes the radio to reset and then it's not yet available when Hamlib tries to connect. We can work around that by blocking the ability for Hamlib to reset the port. The simplest way to do that is to have the port already in use when Hamlib starts up.

I was not able to achieve that using the Hamlib built into WSJT-X. However, by installing Hamlib separately,

relistan

def connect(addresses, dc_name)
    builder = CqlSession.builder()
      .withLocalDatacenter(dc_name)

    addresses.each do |a|
      (host, port) = a.split(/:/)
      port ||= 9042
      builder
        .addContactPoint(InetSocketAddress.new(host.to_java_string, port.to_i))
        .withAuthCredentials('[redacted]', '[redacted]')

relistan

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?
    ENV[key]
  rescue KeyError
    if default.nil? && !nilable
      abort "You must set a value for env var '#{key}'"
    else

relistan

Keybase proof

I hereby claim:

• I am relistan on github.
• I am relistan (https://keybase.io/relistan) on keybase.
• I have a public key ASAFN-_0eLk8YPjMdYWgLmXs9RxtcSbJmdQLMUXSLcG1fQo

To claim this, I am signing this object:

relistan

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)
  end

  # E.g.

relistan

FROM envoyproxy/envoy:v1.5.0
RUN apt-get update
COPY envoy.yaml /etc/envoy.yaml
ADD run.sh /run.sh
CMD /run.sh

relistan

-- 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

package main

import (
	"fmt"
	"io"
	"os"

	"github.com/fsouza/go-dockerclient"
)