Merge pull request #876 from elventear/postgresql_fix

Changes to postgresql to support defaults settings and older psycopg2

library/postgresql_db

@@ -75,13 +75,26 @@ def main():
     encoding = module.params["encoding"]
     state = module.params["state"]
     changed = False
+
+    # To use defaults values, keyword arguments must be absent, so 
+    # check which values are empty and don't include in the **kw
+    # dictionary
+    params_map =  {
+        "login_host":"host",
+        "login_user":"user",
+        "login_password":"password"
+    }
+    kw = dict( (params_map[k], v) for (k, v) in module.params.iteritems() 
+              if k in params_map and v != '' )
     try:
-        db_connection = psycopg2.connect(host=module.params["login_host"],
-                                         user=module.params["login_user"],
-                                         password=module.params["login_password"],
-                                         database="template1")
+        db_connection = psycopg2.connect(database="template1", **kw)
         # Enable autocommit so we can create databases
+        if psycopg2.__version__ >= '2.4.2':
             db_connection.autocommit = True
+        else:
+            db_connection.set_isolation_level(psycopg2
+                                              .extensions
+                                              .ISOLATION_LEVEL_AUTOCOMMIT)
         cursor = db_connection.cursor()
     except Exception, e:
         module.fail_json(msg="unable to connect to database: %s" % e)