Re: Query Tool Slow to Load

To Dave and maintainers,

Here's when the click event handler triggers,

Here is the first loading screen,

It takes  3.8 - 1.5 = 2.3s for the loading screen to show up.

Here's when the query tool is ready to use,

It takes 4.7s - 1.5s = 3.2s total for the query tool to be ready since click,  0.9s for UI instantiation.

So, I looked at what is causing the delay, there is an ajax request to initialize_datagrid that takes 2s to complete. It's primary job is to return a transaction id under the key `gridTransId` after making the connection to the database. Obviously, dns, ssl, and password authentication to a remote database is going to incur delays. There is nothing that can be done to prevent that. BUT, there is no need to delay the loading of the query editor till the transaction id is received.

this.on('pgadmin-datagrid:transaction:created', function(trans_obj) {

this.launch_grid(trans_obj);

});

^ This is where the delay happens. I suggest launching the grid instantly behind the $spinner_el and remove the $spinner_el when the transaction id is recieved and set via self.

There are two primary hindrances to doing this, one being the transaction id being used as a url param in new tab mode,

var url_params = {

'trans_id': trans_obj.gridTransId, // <<---- HERE

'is_query_tool': trans_obj.is_query_tool,

'editor_title': titileForURLObj.title,

},

baseUrl = url_for('datagrid.panel', url_params) +

'?' + 'query_url=' + encodeURI(trans_obj.sURL) +

'&server_type=' + encodeURIComponent(trans_obj.server_type) +

'&server_ver=' + trans_obj.serverVersion+

'&fslashes=' + titileForURLObj.slashLocations;

The other being this close handler,

queryToolPanel.on(wcDocker.EVENT.CLOSED, function() {

$.ajax({

url: url_for('datagrid.close', {'trans_id': trans_obj.gridTransId}), // <<---- and HERE

method: 'DELETE',

});

});

Looking at the python server, this id is nothing but a random number between 1 and 9999999,

# Create a unique id for the transaction

trans_id = str(random.randint(1, 9999999))

So instead of generating this id once the connection to the database has been established, I suggest generating a random number in javascript and POSTing it to the backend to be associated with the newly created connection asynchronously while the query tool loads in the background. The spinning indicator can be removed once the server sends an OK response once the connection is established and associated with the number POSTed.