Docker Swarm deploy - wait for service/container to be present

Docker stack deploy creates tasks which try to get the system to the state you desire. Sometimes tasks succeed, sometimes they fail and the orchestrator will generate new tasks until the system matches the state described in your yml files.

The bad news: docker stack deploy does not support blocking until the state you desire is reached.

Here some how to get the info you want using the docker cli and basic bash tools (which you can surely implement in a similar way in any other language)

In bash you could do docker service ls --format '{{.ID}} {{.Name}}' | grep ${serviceName} to get the ServiceId of your service (its the first of the two words returned)

according to the docs docker service ps does:

List the tasks of one or more services

Also it adds some information about the task 'current state' which is the information you care about.

Then you use docker service ps ${ServiceId} --format '{{.CurrentState}} {{.Image}}' | grep Running.*${newImageName}

If this command returns something there is a container running with your new image. Hurray :)

I hope this introduces you to all the tools you need. Docker service ps is also helpfull for finding out why a task failed.

FYI: The possible values of task state according to the Swarm task states documentation are:

NEW The task was initialized.

PENDING Resources for the task were allocated.

ASSIGNED Docker assigned the task to nodes.

ACCEPTED The task was accepted by a worker node. If a worker node rejects the task, the state changes to REJECTED.

PREPARING Docker is preparing the task.

STARTING Docker is starting the task.

RUNNING The task is executing.

COMPLETE The task exited without an error code.

FAILED The task exited with an error code.

SHUTDOWN Docker requested the task to shut down.

REJECTED The worker node rejected the task.

ORPHANED The node was down for too long.

Use events - it's what they're designed for.

You don't need to use a boolean variable for this in the Button_Click event handler call your code:

private void Button_Click(object sender, EventArgs e)
{
    // The code you need to execute when the button is pressed
}

As @trickdev points out you will need to subscribe to this event but if you use the Events window in Visual Studio it will add the necessary code - including the empty handler - for you.

With event driven programs you are always waiting until the next "thing" happens. So in your case (if I've understood your application correctly) when you start the program it should simply tell the first button to flash "N" times. If you write that as event then the application will return to the waiting state once the code has completed.

Then in the button click event handler - you can subscribe all the buttons to the same event - you can check that the correct button has been pressed and then tell the next button to flash. If the wrong button was pressed then display a suitable message.

So in pseudo code you have:

public class Form
{
    Initialise()
    {
        this.Loaded += FormLoaded;
    }

    private void FormLoaded(object sender, EventArgs e)
    {
        // pick a button
        pickedButton.Flash();
    }

    private void Button_Click(object sender, EventArgs e)
    {
        if (sender == pickedButton)
        {
            pickedButton = pickButton();
        }
        else
        {
            message = "Sorry wrong button, try again";
        }

        pickedButton.Flash();
    }
}

public class Button
{
    public void Flash()
    {
        // loop N times turning button on/off
    }
}

The syntax you used for EC.text_to_be_present_in_element("No data to display")) is wrong.

The syntax is:

class selenium.webdriver.support.expected_conditions.text_to_be_present_in_element(locator, text_)

An expectation for checking if the given text is present in the specified element. locator, text

So, clearly, the locator is missing in your code in which the text to be checked. putting parenthesis also the issue you are facing (in the second edit).

Use as follows (to add locator with correct parenthesis ):

EC.text_to_be_present_in_element((By.ID, "operations_monitoring_tab_current_ct_fields_no_data"), "No data to display")

Note: By.id is just an example. you can use any locator to identify the element supported by selenium