Wrap all close() calls in "ensure" blocks and simplify DB connection-making.

[mailshears.git] / lib / common / roundcube_plugin.rb

diff --git a/lib/common/roundcube_plugin.rb b/lib/common/roundcube_plugin.rb
index 1f9805a3e9d079243da75859f6992d7688e6f266..a4300c4a016bcd8f85d6177edd76f1ee51378426 100644 (file)
--- a/lib/common/roundcube_plugin.rb
+++ b/lib/common/roundcube_plugin.rb
@@ -1,93 +1,92 @@
 require 'common/plugin'
+require 'common/user'
 
+# Code that all Roundcube plugins ({RoundcubePrune}, {RoundcubeRm},
+# {RoundcubeMv}) share.
+#
 module RoundcubePlugin
-  # Code that all Roundcube plugins (Prune, Rm, Mv...) will share.
-  # That is, we implement the Plugin interface.
+
+  # We implement the Plugin "interface."
   include Plugin
 
+
+  # Initialize this Roundcube {Plugin} with values in *cfg*.
+  #
+  # @param cfg [Configuration] the configuration for this plugin.
+  #
   def initialize(cfg)
-    @db_host = cfg.roundcube_dbhost
-    @db_port = cfg.roundcube_dbport
-    @db_opts = cfg.roundcube_dbopts
-    @db_tty  = cfg.roundcube_dbtty
-    @db_name = cfg.roundcube_dbname
-    @db_user = cfg.roundcube_dbuser
-    @db_pass = cfg.roundcube_dbpass
+    @db_hash = {
+      :host     => cfg.roundcube_dbhost,
+      :port     => cfg.roundcube_dbport,
+      :options  => cfg.roundcube_dbopts,
+      :tty      => cfg.roundcube_dbtty,
+      :dbname   => cfg.roundcube_dbname,
+      :user     => cfg.roundcube_dbuser,
+      :password => cfg.roundcube_dbpass }
   end
 
 
-  def describe_domain(domain)
-    # Roundcube doesn't have a concept of domains.
-    return domain
-  end
-
+  # Describe the given Roundcube *user*.
+  #
+  # @param user [User] the user whose description we want.
+  #
+  # @return [String] a string containing the Roundcube "User ID"
+  #   associated with *user*.
+  #
   def describe_user(user)
     user_id = self.get_user_id(user)
-
-    if user_id.nil?
-      return 'User not found'
-    else
-      return "User ID: #{user_id}"
-    end
+    return "User ID: #{user_id}"
   end
 
 
+  # Return a list of Roundcube users.
+  #
+  # @return [Array<User>] a list of users contained in the
+  #   Roundcube database.
+  #
   def list_users()
-    # Produce a list of Roundcube users. This is used in prune/rm, and
-    # is public because it is useful in testing.
     usernames = []
 
-    # Just assume PostgreSQL for now.
+    connection = PG::Connection.connect(@db_hash)
+
+    sql_query = 'SELECT username FROM users;'
+
     begin
-      connection = PGconn.connect(@db_host,
-                                  @db_port,
-                                  @db_opts,
-                                  @db_tty,
-                                  @db_name,
-                                  @db_user,
-                                  @db_pass)
-
-      sql_query = "SELECT username FROM users;"
       connection.query(sql_query) do |result|
         usernames = result.field_values('username')
       end
-
+    ensure
+      # Make sure the connection gets closed even if the query explodes.
       connection.close()
-    rescue PGError => e
-      # Pretend like we're database-agnostic in case we ever are.
-      raise DatabaseError.new(e)
     end
 
-    return usernames
+    return usernames.map{ |u| User.new(u) }
   end
 
   protected;
 
+
+  # Find the Roundcube "User ID" associated with the given *user*.
+  #
+  # @param user [User] the user whose Roundcube "User ID" we want.
+  #
+  # @return [Fixnum] the Roundcube "User ID" for *user*.
+  #
   def get_user_id(user)
     user_id = nil
 
-    begin
-      connection = PGconn.connect(@db_host,
-                                  @db_port,
-                                  @db_opts,
-                                  @db_tty,
-                                  @db_name,
-                                  @db_user,
-                                  @db_pass)
-
-      sql_query = "SELECT user_id FROM users WHERE username = $1;"
+    connection = PG::Connection.new(@db_hash)
+    sql_query = 'SELECT user_id FROM users WHERE username = $1;'
 
-      connection.query(sql_query, [user]) do |result|
+    begin
+      connection.query(sql_query, [user.to_s()]) do |result|
         if result.num_tuples > 0
           user_id = result[0]['user_id']
         end
       end
-
+    ensure
+      # Make sure the connection gets closed even if the query explodes.
       connection.close()
-
-    rescue PGError => e
-      # Pretend like we're database-agnostic in case we ever are.
-      raise DatabaseError.new(e)
     end
 
     return user_id