Added call to event service after reload

[gsoria]

We've added a new service that listens to events defined in the scenario and allows us to override the default behavior of the platform.

For the HTML scenarios In the gulpfile.js we've added a new task callEventService that is executed after reload task and notifies to katacoda when it is the appropriate time to hiding the progress bar.
Basically this is a POST request that follows this pattern:

curl -X POST https://environment-events.katacoda.com -d "socket=$1&message=message"

The socket parameter can be retrieved from the file /tmp/socket available in the environment.

This functionality is available in beta for now.

[christiemolloy]

Hi @gsoria , thank you so much for working on this! I've been testing the new functionality here: https://www.beta.katacoda.com/patternfly/courses/charts/area-chart

It works really well for every step except for the initial step.

Step 3, no. 1 : When I open app.js, it should(used to) render "Welcome to PatternFly" but now it won't do that unless I hit the reload button (which was not that intuitive).

Step 3, no.2: This loads without having to hit the reload button, however takes about 30sec-1min

Every step after this loads the changes fast, and I don't need to hit the reload button :)

@dgutride was seeing the same thing. I'm wondering if you're also seeing it?

[gsoria]

Hi @christiemolloy @dgutride, sorry for the delay.

I was debugging the issue mentioned about the initial step, and I noticed that only happens in beta. I'll keep investigating the cause.

I updated the PR, with the current changes in master.

I've tested the changes with this scenario:
https://www.katacoda.com/v1wpig/courses/html-css/building-blocks

Please note that this PR contains the changes only for the scenarios that use pf-express.tar.gz so, the scenarios that should use to test this change are the scenarios under html-css/*

For the scenarios that use pf-react-express.tar.gz a similar change that I made in gulpfile.js to call the event service (callEventService function) is needed for pf-react-express.tar.gz.

Also, I add to this PR the loading of the file index.html at the start of the scenario, I think is more correct and helps to understand the correspondence between the editor and the iframe below.

Please test this change and let me know what do you think.
Thanks :)

[christiemolloy]

@gsoria tested and this looks great!

Do I just need to update the actions and asyncFiles for the other modules?