module-postgresql/manifests/validate_db_connection.pp
Ken Barber 59c1cbfbf8 Major rewrite to solve order dependencies and unclear public API
This is a very very large change to the module. It started out as a fix to add
postgresl::server::config_entry, and quickly became a rewrite to fix a lot of
ordering issues inherent in the API.

Since this changes the Public API it is considered a backwards compatible
change.

See the upgrading guide in README.md for more details as to what has been
modified in this patch.

Signed-off-by: Ken Barber <ken@bob.sh>
2013-09-14 06:39:15 +01:00

40 lines
1.6 KiB
Puppet

# This type validates that a successful postgres connection can be established
# between the node on which this resource is run and a specified postgres
# instance (host/port/user/password/database name).
#
# See README.md for more details.
define postgresql::validate_db_connection(
$database_host,
$database_name,
$database_password,
$database_username,
$database_port = 5432
) {
require postgresql::client
$psql_path = $postgresql::params::psql_path
# TODO: port to ruby
$psql = "${psql_path} --tuples-only --quiet -h ${database_host} -U ${database_username} -p ${database_port} --dbname ${database_name}"
$exec_name = "validate postgres connection for ${database_host}/${database_name}"
exec { $exec_name:
command => '/bin/false',
unless => "/bin/echo \"SELECT 1\" | ${psql}",
cwd => '/tmp',
environment => "PGPASSWORD=${database_password}",
logoutput => 'on_failure',
require => Package['postgresql-client'],
}
# This is a little bit of puppet magic. What we want to do here is make
# sure that if the validation and the database instance creation are being
# applied on the same machine, then the database resource is applied *before*
# the validation resource. Otherwise, the validation is guaranteed to fail
# on the first run.
#
# We accomplish this by using Puppet's resource collection syntax to search
# for the Database resource in our current catalog; if it exists, the
# appropriate relationship is created here.
Postgresql::Server::Database<|title == $database_name|> -> Exec[$exec_name]
}