Don't fail if the source user doesn't exist during an AgendavMv.

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

diff --git a/lib/common/agendav_plugin.rb b/lib/common/agendav_plugin.rb
index 9af7b01519b40aca2870176948ed4f0ac6f950cb..c5e7d7719178dd5035f46b39a2c8cf79c78399ae 100644 (file)
--- a/lib/common/agendav_plugin.rb
+++ b/lib/common/agendav_plugin.rb
@@ -1,43 +1,55 @@
 require 'common/plugin'
 require 'common/user'
 
+# Code that all Agendav plugins ({AgendavPrune}, {AgendavRm},
+# {AgendavMv}) share.
 module AgendavPlugin
-  # Code that all Agendav plugins (Prune, Rm, Mv...) will
-  # share.  That is, we implement the Plugin interface.
+
+  # We implement the Plugin "interface."
   include Plugin
 
 
+  # Initialize this Agendav {Plugin} with values in *cfg*.
+  #
+  # @param cfg [Configuration] the configuration for this plugin.
+  #
   def initialize(cfg)
-    @db_host = cfg.agendav_dbhost
-    @db_port = cfg.agendav_dbport
-    @db_opts = cfg.agendav_dbopts
-    @db_tty  = cfg.agendav_dbtty
-    @db_name = cfg.agendav_dbname
-    @db_user = cfg.agendav_dbuser
-    @db_pass = cfg.agendav_dbpass
+    @db_hash = {
+      :host     => cfg.agendav_dbhost,
+      :port     => cfg.agendav_dbport,
+      :options  => cfg.agendav_dbopts,
+      :tty      => cfg.agendav_dbtty,
+      :dbname   => cfg.agendav_dbname,
+      :user     => cfg.agendav_dbuser,
+      :password => cfg.agendav_dbpass }
   end
 
 
+  # Return a list of Agendav users.
+  #
+  # @return [Array<User>] a list of users contained in the
+  #   Agendav database.
+  #
   def list_users()
-    #
-    # Produce a list of AgenDAV users. This is public because it's
-    # useful in testing.
-    #
     users = []
 
-    connection = PGconn.connect(@db_host, @db_port, @db_opts, @db_tty,
-                                @db_name, @db_user, @db_pass)
-
-    sql_query  = '(SELECT username FROM prefs)'
-    sql_query += 'UNION'
-    sql_query += '(SELECT user_from FROM shared);'
-
-    connection.query(sql_query) do |result|
-      users = result.field_values('username')
+    connection = PG::Connection.new(@db_hash)
+
+    # There are also "owner" and "with" fields in the "shares" table,
+    # but they contains principal URLs and not a bare username. Thus
+    # their format depends on the CalDAV server configuration, and
+    # isn't predictable.
+    sql_query  = 'SELECT username FROM prefs;'
+
+    begin
+      connection.query(sql_query) do |result|
+        users = result.field_values('username')
+      end
+    ensure
+      # Make sure the connection gets closed even if the query explodes.
+      connection.close()
     end
 
-    connection.close()
-
     return users.map{ |u| User.new(u) }
   end