Question 1

How do I handle disconnections and missed messages in slack-scala-client's RTM client?

Accepted Answer

The library doesn't automatically handle missed messages during disconnections, as noted in the Caveat Emptor. You'll need to implement custom reconnection logic and possibly cache state to recover, using Pekko's actor lifecycle management.

Question 2

slack-scala-client vs slack-sdk-java for Scala projects?

Accepted Answer

slack-scala-client is idiomatic Scala with Pekko integration for real-time messaging, while slack-sdk-java is the official Java SDK with broader Slack feature support. Choose slack-scala-client for Scala-centric projects with RTM needs, but be aware of its potential reliability gaps compared to the more maintained SDK.

Question 3

How to send a direct message to a specific user with slack-scala-client?

Accepted Answer

Use the state management to get the user ID by name (e.g., state.getUserIdForName), then call client.sendMessage with the user's ID. The README shows examples for channels, similar for users, leveraging the active state for lookups.

Question 4

Does slack-scala-client support Slack's Events API with HTTP endpoints?

Accepted Answer

Primarily focuses on the RTM API for real-time events; for Events API with HTTP, you'd need to use the API client manually to handle webhooks, but it's not explicitly designed or documented for this, limiting scalability for event-driven apps.

Question 5

How to test a Slack bot built with slack-scala-client?

Accepted Answer

Use Pekko TestKit for unit testing actors and event handlers, and mock the Slack API responses with test tokens. Integration testing may require setting up a test Slack workspace due to the library's dependency on real API calls and RTM connections.

Question 6

What versions of Scala and Pekko does slack-scala-client support?

Accepted Answer

Check the library's dependency details in the README or build files; it typically supports recent Scala 2.x versions and Pekko (formerly Akka), but you must verify compatibility as updates may lag behind newer releases.

Question 7

How to set up a bot that responds to slash commands with slack-scala-client?

Accepted Answer

You'll need to use the API client to handle incoming slash command HTTP requests separately, as the RTM client doesn't natively support slash commands. Implement a web server to receive commands and use the client to send responses, adding complexity beyond the core library.

slack-scala-client

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