Data Push Apps with HTML5 SSE: Pragmatic Solutions for by Darren Cook

By Darren Cook

Verify your web site or internet software clients get content material updates right now with minimum latency. This concise consultant indicates you ways to push new info from the server to consumers with HTML5 Server-Sent occasions (SSE), a very good expertise that doesn’t require consistent polling or consumer interplay. You’ll tips on how to construct a real-world SSE software from begin to end that solves a difficult area problem.

You’ll additionally realize tips on how to raise that application’s laptop and cellular browser help from 60% to 99%, utilizing various fallback options. If you’re acquainted with HTML, HTTP, and uncomplicated JavaScript, you’re able to get started.

• make certain even if SSE, WebSockets, or info pull is better in your organization
• increase a operating SSE software whole with backend and frontend solutions
• deal with mistakes dealing with, process restoration, and different concerns to make the appliance production-quality
• discover fallback ideas for browsers that don’t aid SSE
• take on safety matters, together with authorization and "disallowed origin"
• increase sensible, repeatable information that’s valuable in test-driven SSE design
• study SSE protocol components now not lined within the instance program

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Hardcoding the values pointed to by the environment variables in your OpenShift applica‐ tion can cause it to break. So, in case you didn’t get the message, don’t hardcode the values of the environment variables. You can view the values of some of the essential environment variables, such as your database details, in the output of the command rhc app show -a appname. To view all of the environment variables and their values, SSH into your application gear and ex‐ ecute the command env. To view only the environment variables with names including the word “OPENSHIFT,” use the command env | grep OPENSHIFT.

The cartridge gives visibility to some key information, including the amount of CPU and RAM use (and how that relates to the gear limit), how much swap space is being utilized, application process IDs, and whether or not your applica‐ tion is in an idle state. Figure 4-1. The OpenShift Metrics cartridge interface Another monitoring option is the Monit cartridge, which uses the open source Monit process supervision tool. The cartridge comes with some predefined rules for checking OpenShift application availability, storage, and memory use.

Action hook scripts need to be added and committed in Git just like any other repository file. When they are pushed to the cloud, you will see any effects as the build lifecycle runs. For example, if you delete files in the /tmp directory as part of an action hook, the git push output will echo the result of that command unless you tell your script to swallow output. Hot-Deploying Code When we pushed our code changes to the example application, we saw that the Python cartridge was stopped while the app was built and deployed, and then started back up again.

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