lib,test: replace connection query() method with sync_exec{,_params}.

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

diff --git a/lib/common/davical_plugin.rb b/lib/common/davical_plugin.rb
index 363e08ef298cfc402aaf051ad486fedd3f553323..06abbfa99e31844b6ae22c5190a828837e59862c 100644 (file)
--- a/lib/common/davical_plugin.rb
+++ b/lib/common/davical_plugin.rb
@@ -1,72 +1,103 @@
 require 'common/plugin'
 require 'common/user'
 
+# Code that all DAViCal plugins ({DavicalPrune}, {DavicalRm}, and
+# {DavicalMv}) will share.
+#
 module DavicalPlugin
-  # Code that all Davical plugins (Prune, Rm, Mv...) will share.  That
-  # is, we implement the Plugin interface.
+
+  # We implement the Plugin "interface."
   include Plugin
 
+  # Initialize this DAViCal {Plugin} with values in *cfg*.
+  #
+  # @param cfg [Configuration] the configuration for this plugin.
+  #
   def initialize(cfg)
-    @db_host = cfg.davical_dbhost
-    @db_port = cfg.davical_dbport
-    @db_opts = cfg.davical_dbopts
-    @db_tty  = cfg.davical_dbtty
-    @db_name = cfg.davical_dbname
-    @db_user = cfg.davical_dbuser
-    @db_pass = cfg.davical_dbpass
+    @db_hash = {
+      :host     => cfg.davical_dbhost,
+      :port     => cfg.davical_dbport,
+      :options  => cfg.davical_dbopts,
+      :tty      => cfg.davical_dbtty,
+      :dbname   => cfg.davical_dbname,
+      :user     => cfg.davical_dbuser,
+      :password => cfg.davical_dbpass }
   end
 
 
+  # Describe the given DAViCal user who is assumed to exist.
+  #
+  # @param user [User] the {User} object whose description we want.
+  #
+  # @return [String] a String describing the given *user* in terms
+  #   of his DAViCal "Principal ID".
+  #
   def describe_user(user)
     principal_id = self.get_principal_id(user)
     return "Principal ID: #{principal_id}"
   end
 
 
+  #
+  # Produce a list of DAViCal users.
+  #
+  # This method remains public for use in testing.
+  #
+  # @return [Array<User>] an array of {User} objects, one for each
+  #   user found in the DAViCal database.
+  #
   def list_users()
-    #
-    # Produce a list of DAViCal users. This is public because it's
-    # useful for testing.
-    #
     usernames = []
 
-    connection = PGconn.connect(@db_host, @db_port, @db_opts, @db_tty,
-                                @db_name, @db_user, @db_pass)
+    connection = PG::Connection.new(@db_hash)
 
     # User #1 is the super-user, and not tied to an email address.
-    sql_query = 'SELECT username FROM usr WHERE user_no > 1'
+    sql_query = 'SELECT username FROM usr WHERE user_no > 1;'
 
-    connection.query(sql_query) do |result|
-      usernames = result.field_values('username')
+    begin
+      connection.sync_exec(sql_query) do |result|
+        usernames = result.field_values('username')
+      end
+    ensure
+      # Make sure the connection gets closed even if the query explodes.
+      connection.close()
     end
 
-    connection.close()
-
     return usernames.map{ |u| User.new(u) }
   end
 
 
   protected;
 
+
+  # Find the "Principal ID" of the given user.
+  #
+  # @param user [User] the user whose Principal ID we want.
+  #
+  # @return [Fixnum] an integer representing the user's Principal ID
+  #   that we obtained from the DAViCal database.
+  #
   def get_principal_id(user)
     principal_id = nil
 
-    connection = PGconn.connect(@db_host, @db_port, @db_opts, @db_tty,
-                                @db_name, @db_user, @db_pass)
+    connection = PG::Connection.new(@db_hash)
 
     sql_query =  'SELECT principal.principal_id '
     sql_query += 'FROM (principal INNER JOIN usr '
     sql_query += '      ON principal.user_no = usr.user_no) '
     sql_query += 'WHERE usr.username = $1;'
 
-    connection.query(sql_query, [user.to_s()]) do |result|
-      if result.num_tuples > 0
-        principal_id = result[0]['principal_id']
+    begin
+      connection.sync_exec_params(sql_query, [user.to_s()]) do |result|
+        if result.num_tuples > 0
+          principal_id = result[0]['principal_id']
+        end
       end
+    ensure
+      # Make sure the connection gets closed even if the query explodes.
+      connection.close()
     end
 
-    connection.close()
-
     return principal_id
   end