sidekiq_sanity_check_v3 - Revert to using --daemon flag, and use a lightweight Ruby script to push the job to Redis

sidekiq_sanity_check_v3.sh

#!/bin/bash
set -e
if [ -f .env ]; then spring stop; fi

# This script is run in the CI build. It requires a REDIS_URL variable,
# and runs a test job through the WorkerHealthCheckJob.
# I added this check after I accidentally pushed a change that caused the sidekiq
# workers to crash on boot. The jobs were well-tested, but the actual
# sidekiq config had an error inside a #configure_server block, so the code
# only crashed when I started an actual Sidekiq worker process.

SIDEKIQ_PID_FILE="tmp/sidekiq-test-worker.pid"
SIDEKIQ_LOG_FILE="log/sidekiq-test-worker.log"
SIDEKIQ_RESULT_FILE="/tmp/sidekiq-worker-test.txt"

echo "Starting Sidekiq process..."
# pidfile / logfile / daemon options will be removed in Sidekiq 6
# See: https://github.com/mperham/sidekiq/issues/4045
# However, I was having problems running "sidekiq &" in the CI Docker container.
sidekiq --pidfile "$SIDEKIQ_PID_FILE" --logfile "$SIDEKIQ_LOG_FILE" --daemon

rm -rf "$SIDEKIQ_RESULT_FILE"
RANDOM_STRING=$(openssl rand -hex 32)

cat > /tmp/sidekiq-redis-script.rb <<RUBY
require 'redis'
require 'securerandom'
require 'json'
redis = Redis.new(:url => ENV.fetch('REDIS_URL'))
data = { "class" => 'WorkerHealthCheckJob',
        "queue" => 'default',
        "args" => [ARGV[0]],
        'retry' => false,
        'jid' => SecureRandom.hex(12),
        'created_at' => Time.now.to_f,
        'enqueued_at' => Time.now.to_f }
msg = JSON.dump(data)
puts "Pushing WorkerHealthCheckJob to Redis (queue:default) - #{msg}"
redis.lpush("queue:default", msg)
RUBY
ruby /tmp/sidekiq-redis-script.rb "$RANDOM_STRING"

SUCCESS="no"
RETRY_COUNT=0

echo "Waiting for $SIDEKIQ_RESULT_FILE to contain $RANDOM_STRING..."
while [ ! -f "$SIDEKIQ_RESULT_FILE" ]; do
  if [ $RETRY_COUNT -gt 60 ]; then
    echo "Did not find $SIDEKIQ_RESULT_FILE after 60 seconds!"
    break
  fi
  RETRY_COUNT=$((RETRY_COUNT+1))
  sleep 1
done

if [ -f "$SIDEKIQ_RESULT_FILE" ]; then
  RESULT_CONTENTS=$(cat "$SIDEKIQ_RESULT_FILE")
  if [ "$RESULT_CONTENTS" == "$RANDOM_STRING" ]; then
    echo "Success!"
    SUCCESS="yes"
  else
    echo "$SIDEKIQ_RESULT_FILE contents did not match the expected string!"
    echo "Contents: '$RESULT_CONTENTS'"
    echo "Expected: '$RANDOM_STRING'"
  fi
fi

if [ -f "$SIDEKIQ_PID_FILE" ]; then
  SIDEKIQ_PID=$(cat "$SIDEKIQ_PID_FILE")
  if [ -z "$SIDEKIQ_PID" ]; then
    echo "$SIDEKIQ_PID_FILE was empty. Please manually kill Sidekiq."
  fi
else
  echo "Could not find PID file at $SIDEKIQ_PID_FILE. Please manually kill Sidekiq."
fi

if [ -f "$SIDEKIQ_LOG_FILE" ]; then
  echo "Sidekiq Logs:"
  cat "$SIDEKIQ_LOG_FILE"
fi

if [ -z "$SIDEKIQ_PID" ]; then exit 1; fi
echo "Killing Sidekiq process ($SIDEKIQ_PID)..."
kill -9 "$SIDEKIQ_PID"
rm -rf "$SIDEKIQ_PID_FILE" "$SIDEKIQ_LOG_FILE" "$SIDEKIQ_RESULT_FILE"

if [ "$SUCCESS" != "yes" ]; then
  echo "Sidekiq test failed!"
  exit 1
fi
if [ -f .env ]; then spring stop; fi
echo "Sidekiq test passed!"