event.go

package main

import (
	"encoding/json"
	"fmt"
	"time"
)
type Event struct {
	// Type is the message type sent
	Type string `json:"type"`
	// Payload is the data Based on the Type
	Payload json.RawMessage `json:"payload"`
}
type EventHandler func(event Event, c *Client) error

const (
	
	EventSendMessage = "send_message"
	EventNewMessage = "new_message"
	EventChangeRoom = "change_room"
)
type SendMessageEvent struct {
	Message string `json:"message"`
	From    string `json:"from"`
}
type NewMessageEvent struct {
	SendMessageEvent
	Sent time.Time `json:"sent"`
}
func SendMessageHandler(event Event, c *Client) error {
	// Marshal Payload into wanted format
	var chatevent SendMessageEvent
	if err := json.Unmarshal(event.Payload, &chatevent); err != nil {
		return fmt.Errorf("bad payload in request: %v", err)
	}
	var broadMessage NewMessageEvent

	broadMessage.Sent = time.Now()
	broadMessage.Message = chatevent.Message
	broadMessage.From = chatevent.From

	data, err := json.Marshal(broadMessage)
	if err != nil {
		return fmt.Errorf("failed to marshal broadcast message: %v", err)
	}
	var outgoingEvent Event
	outgoingEvent.Payload = data
	outgoingEvent.Type = EventNewMessage
	for client := range c.manager.clients {
		if client.chatroom == c.chatroom {
			client.egress <- outgoingEvent
		}

	}
	return nil
}

type ChangeRoomEvent struct {
	Name string `json:"name"`
}
func ChatRoomHandler(event Event, c *Client) error {
	var changeRoomEvent ChangeRoomEvent
	if err := json.Unmarshal(event.Payload, &changeRoomEvent); err != nil {
		return fmt.Errorf("bad payload in request: %v", err)
	}
	c.chatroom = changeRoomEvent.Name

	return nil
}