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Allow empty string value for config entries #1603

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Allow empty string value for config entries #1603

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2 changes: 1 addition & 1 deletion manifests/server/config_entry.pp
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@
define postgresql::server::config_entry (
Enum['present', 'absent'] $ensure = 'present',
String[1] $key = $name,
Optional[Variant[String[1], Numeric, Array[String[1]]]] $value = undef,
Optional[Variant[String, Numeric, Array[String[1]]]] $value = undef,
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Should the array also allow empty strings?

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I am not aware of a use-case where an array would contain empty string values.

But I am not even sure if array values make sense for Postgres config entries, because it seems to use just (quoted) strings, integers, floats and booleans (https://www.postgresql.org/docs/current/config-setting.html#CONFIG-SETTING-NAMES-VALUES). And from quickly looking at the postgresql_conf provider I don't immediately see where/how it even handles array values? But in any case, I don't think we need to touch this part of the functionality here. Just support for single, empty string values would be nice :)

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That may actually be a regression introduced in 179472b. It was added in 36674b3 but contain any description. #1434 does point to listen_addresses and now I wonder if that functionality actually works now.

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Indeed, it seems the accepted data types of $value were changed to include Array[String[1]], and the "parsed" provider was replaced by a "ruby" provider, but there doesn't seem to have been any code added to actually handle such array values. The parsed provider had something like h[:value].join(', ') when h[:value] was an array, but I see no equivalent in the ruby provider.

But I suppose this discussion is best moved elsewhere, probably to its own bug report?

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Indeed, it seems the accepted data types of $value were changed to include Array[String[1]], and the "parsed" provider was replaced by a "ruby" provider, but there doesn't seem to have been any code added to actually handle such array values. The parsed provider had something like h[:value].join(', ') when h[:value] was an array, but I see no equivalent in the ruby provider.

If the implementation is h[:value].join(', ') then an empty array should result in an empty string and allowing empty strings within the array doesn't make sense. It'd result in , which is probably never valid. In other words, consider my comments addressed.

But I suppose this discussion is best moved elsewhere, probably to its own bug report?

Yes, agreed.

Stdlib::Absolutepath $path = $postgresql::server::postgresql_conf_path,
Optional[String[1]] $comment = undef,
String[1] $instance_name = 'main',
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16 changes: 16 additions & 0 deletions spec/defines/server/config_entry_spec.rb
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Expand Up @@ -79,4 +79,20 @@
.that_notifies('Postgresql::Server::Instance::Service[main]')
end
end

# Example use case for empty values: using transaction-bound session
# variables, like `SET LOCAL awesome_app.tenant_id = 92834` requires the
# variable to be defined in postgresql.conf and initialised with a default
# value (at least for PostgreSQL 13 and older, possibly also in newer
# versions). The default value can (and sometimes, depending on the
# application should) be empty.
context 'set a config entry value to the empty string' do
let(:params) { { ensure: 'present', name: 'mydb.app_param', value: '' } }

it 'sets value to the empty string' do
expect(subject).to contain_postgresql_conf('mydb.app_param').with(
name: 'mydb.app_param',
value: '')
end
end
end
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