Question 1

How to set up end-to-end encryption with Pusher in Ruby?

Accepted Answer

First, install Libsodium and add the rbnacl gem to your Gemfile. Generate a 32-byte master key using openssl, encode it as base64, and configure the Pusher client with encryption_master_key_base64. Use channels prefixed with 'private-encrypted-' for secure events.

Question 2

Pusher HTTP Ruby vs Action Cable for real-time in Rails?

Accepted Answer

Pusher HTTP Ruby is better for scalable, hosted real-time features with less server maintenance, while Action Cable is built into Rails and ideal for self-hosted solutions. Choose based on whether you prefer a managed service or in-house control with Rails integration.

Question 3

How to handle WebHooks from Pusher in a Rails controller?

Accepted Answer

Create a WebHook object from the request using pusher.webhook(request), validate it with .valid?, then iterate over events like channel_occupied or channel_vacated to handle channel lifecycle changes, as shown in the README example.

Question 4

What's the best way to make async API calls with Pusher?

Accepted Answer

Use the _async methods with EventMachine for event-driven apps (requiring em-http-request gem) or threads for non-blocking calls. Bind callbacks to EM::Deferrable objects or manage HTTPClient::Connection responses for error handling.

Question 5

How to authenticate users for presence channels in Sinatra?

Accepted Answer

Call pusher.authenticate with the channel name, socket ID, and user details (user_id and optional user_info) in your route. Return the JSON response to the client to allow subscription, following the README's authentication section.

Question 6

Can I use Pusher HTTP Ruby without Rails?

Accepted Answer

Yes, it's a standalone gem compatible with any Ruby framework like Sinatra or Hanami, requiring only Ruby 2.6+ and HTTP client capabilities. Configuration can be done via environment variables or direct instantiation.

Question 7

How to scale event publishing with batch operations?

Accepted Answer

Use the trigger_batch method to send up to 10 events in one API call, reducing overhead. Ensure you stay within the limits for multi-tenant clusters and handle errors with Pusher::Error rescuing, as documented in the README.

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