Where is %{base_url} coming from?

MichaIng · May 1, 2023, 5:14pm

Is the Bitnami container also compiling Discourse completely new when updating it, like the official one?

The variable seems to be defined here:

lib/discourse.rb

26b7f8a


      
          
            result << ":#{ENV["UNICORN_PORT"] || 3000}" if Rails.env.development? && SiteSetting.port.blank?
          
            result
          end
          
          def self.base_url_no_prefix
            "#{base_protocol}://#{current_hostname_with_port}"
          end
          
          def self.base_url
            base_url_no_prefix + base_path
          end
          
          def self.route_for(uri)
            unless uri.is_a?(URI)
              uri =
                begin
                  URI(uri)
                rescue ArgumentError, URI::Error
                end

The current_hostname variable is set here:

github.com/discourse/discourse

lib/discourse.rb

26b7f8a


      
                begin
                  `hostname`.strip
                rescue => e
                  warn_exception(e, message: "hostname command is not working")
                  "unknown_host"
                end
              end
          end
          
          # Get the current base URL for the current site
          def self.current_hostname
            SiteSetting.force_hostname.presence || RailsMultisite::ConnectionManagement.current_hostname
          end
          
          def self.base_path(default_value = "")
            ActionController::Base.config.relative_url_root.presence || default_value
          end
          
          def self.base_uri(default_value = "")
            deprecate("Discourse.base_uri is deprecated, use Discourse.base_path instead")
            base_path(default_value)

The force_hostname variable is declared in the site settings template here:

github.com/discourse/discourse

config/site_settings.yml

e002a24


      
              default: 10
              hidden: true
            max_create_multipart_per_minute:
              default: 10
              hidden: true
            max_complete_multipart_per_minute:
              default: 10
              hidden: true
          
          developer:
            force_hostname:
              hidden: true
              default: ""
            port:
              hidden: true
              default: ""
            enable_chunked_encoding:
              hidden: true
              client: true
              default: true
            long_polling_base_url:

As it is hidden, it cannot be changed in admin settings. As other site settings, I assume it would be stored in the database. I searched a database dump of our instance and force_hostname is not set or even declared. In our official discourse container YAML we have DISCOURSE_HOSTNAME assigned, but I guess this is a global setting, not a site setting, so this seems to be enforced differently.

current_hostname seems to be obtained from the current connecting, i.e. dynamic. But I cannot see where exactly it is defined, probably an external module/gem:

github.com/discourse/discourse

lib/freedom_patches/rails_multisite.rb

6417173


      
          # frozen_string_literal: true
          
          module RailsMultisite
            class ConnectionManagement
              def self.safe_each_connection
                self.each_connection do |db|
                  begin
                    yield(db) if block_given?
                  rescue PG::ConnectionBad, PG::UnableToSend, PG::ServerError
                    break if !defined?(RailsFailover::ActiveRecord)
                    break if db == RailsMultisite::ConnectionManagement::DEFAULT
          
                    reading_role = :"#{db}_#{ActiveRecord.reading_role}"
                    spec = RailsMultisite::ConnectionManagement.connection_spec(db: db)

I’m not sure what the Bitnami container does with the DISCOURSE_HOST setting, so at least you could search your database for force_hostname until we find out more about how DISCOURSE_HOSTNAME from official container is stored and enforced.

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Where is %{base_url} coming from?

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