Added 'getStorageHostname()' method + increased connection retries and wait time.

Signed-off-by: Cristiano Urban <cristiano.urban@inaf.it>

transfer_service/db_connector.py

@@ -44,7 +44,7 @@ class DbConnector(object):
             connect_timeout = 0
         )
 
-    def getConnection(self, retry = 5, timeout = 2):
+    def getConnection(self, retry = 10, timeout = 30):
         if retry < 1:
             retry = 1
         if timeout < 1:
@@ -702,6 +702,26 @@ class DbConnector(object):
         finally:
             self.connPool.putconn(conn, close = False)
 
+    def getStorageHostname(self, storageId):
+        """Returns the storage hostname for a given storage id, if any. Otherwise it returns 'False'."""
+        conn = self.getConnection()
+        try:
+            cursor = conn.cursor(cursor_factory = RealDictCursor)
+            cursor.execute("SELECT hostname FROM storage WHERE storage_id = %s;", (storageId,))
+            result = cursor.fetchall()
+            cursor.close()
+        except Exception:
+            if not conn.closed:
+                conn.rollback()
+            raise
+        else:
+            if result:
+                return result[0]["hostname"]
+            else:
+                return False
+        finally:
+            self.connPool.putconn(conn, close = False)
+
     ##### Location #####
 
     def getLocationId(self, destStorageId):