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main.go

main.go - Overview​

This file defines the core service logic for a chatroom application using DiceDB. It initializes a DiceDB client, provides functions for sending messages, subscribing to message updates, and listening for new messages.

Detailed Documentation​

client​

  • Purpose: A package-level variable that holds the DiceDB client instance.

init​

  • Purpose: Initializes the DiceDB client when the package is loaded. It connects to a DiceDB server running on localhost at port 7379. If the connection fails, the application panics.

SendMessage​

  • Purpose: Sends a message to the DiceDB server, storing it as the "last_message". The message is formatted as "username:message".
  • Parameters:
    • username (string): The username of the sender.
    • message (string): The message content.
  • Returns: None. It prints an error message to the console if the DiceDB command fails.
func SendMessage(username string, message string)

Subscribe​

  • Purpose: Subscribes to changes in the "last_message" key on the DiceDB server.
  • Parameters: None
  • Returns: None. It prints an error message to the console if the subscription fails.
func Subscribe()

ListenForMessages​

  • Purpose: Listens for message updates from the DiceDB server and calls the provided callback function (onMessage) with the new message.
  • Parameters:
    • onMessage (func(message string)): A callback function that is called when a new message is received. The message content is passed as a string argument to this function.
  • Returns: None. It continuously listens for messages until the channel is closed.
func ListenForMessages(onMessage func(message string))

Getting Started Relevance: YES​