Puppet Module : No Code In Data ~ using Hiera with multiple backends

$conf_dir hiera.yaml

:backends:
    - http
    - redis
    - yaml
    - json

:http:
  :host: testnode.testenv.abk
  :port: 5984
  :output: json
  :failure: graceful
  :paths:
    - /config/%{::hostname}.json
    - /config/%{::fqdn}.json
    - /config/%{::environment}.json
    - /config/%{::operatingsystem}.json
    - /config/common.json

:redis:
    :password: my_redis_password

:yaml:
    :datadir: '/etc/puppet/hieradata/yaml'

:json:
    :datadir: '/etc/puppet/hieradata/json'

:hierarchy:
    - %{::hostname}
    - %{::fqdn}
    - %{::environment}
    - %{::operatingsystem}
    - common

:logger: console

etc puppet hieradata json common.json

{
  "message": "It's better to use PuppetDB.",
  "this_file": "/etc/puppet/hieradata/json/common.json"
}

etc puppet hieradata yaml CentOS.yaml

---
public_data : "# created on CentOS"
this_file : "/etc/puppet/hieradata/yaml/CentOS.yaml"

etc puppet hieradata yaml common.yaml

---
public_file : "/tmp/notice"
public_data : "# created on any node"
this_file : "/etc/puppet/hieradata/yaml/common.yaml"

prepare_redis.sh

sed -i 's/^requirepass\s*\S*//g' /etc/redis.conf

REDIS_PASSWORD='my_redis_password'
echo "requirepass $REDIS_PASSWORD" >> /etc/redis.conf

/sbin/service redis restart

redis-cli -a $REDIS_PASSWORD <<'EOF'
  set common:secret_file /etc/local.keys
  set production:secret_file /etc/global.keys
  KEYS *
EOF

testnode.testenv.abk config mynode.json

{
  "secret_data": "all the secret keys",
  "this_file": "http://testnode.testenv.abk/config/mynode.json"
}

use_hiera.sh

gem install hiera hiera-http hiera-puppet hiera-redis

cat > site.pp << EOF
\$public_file = hiera('public_file','/tmp/abc')

file{
  \$public_file:
    content => hiera('public_data','a2z'),
    ensure => present,
}

\$secret_file = hiera('secret_file','/tmp/cba')

file{
  \$secret_file:
    content => hiera('secret_data','z2a'),
    ensure => present,
}

\$msg = hiera('message', '')
notice(\$msg)
EOF

puppet apply  --environment=testnode site.pp