Class: Faye::Redis::SubscriptionManager

Inherits:
Object
  • Object
show all
Defined in:
lib/faye/redis/subscription_manager.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(connection, options = {}) ⇒ SubscriptionManager

Returns a new instance of SubscriptionManager.



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# File 'lib/faye/redis/subscription_manager.rb', line 6

def initialize(connection, options = {})
  @connection = connection
  @options = options
end

Instance Attribute Details

#connection ⇒ Object (readonly)

Returns the value of attribute connection.



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# File 'lib/faye/redis/subscription_manager.rb', line 4

def connection
  @connection
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/faye/redis/subscription_manager.rb', line 4

def options
  @options
end

Instance Method Details

#channel_matches_pattern?(channel, pattern) ⇒ Boolean

Check if a channel matches a pattern

Returns:

  • (Boolean) 


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# File 'lib/faye/redis/subscription_manager.rb', line 149

def channel_matches_pattern?(channel, pattern)
  # Convert Faye wildcard pattern to regex
  # * matches one segment, ** matches multiple segments
  regex_pattern = pattern
    .gsub('**', '__DOUBLE_STAR__')
    .gsub('*', '[^/]+')
    .gsub('__DOUBLE_STAR__', '.*')

  regex = Regexp.new("^#{regex_pattern}$")
  !!(channel =~ regex)
end

#cleanup_client_subscriptions(client_id) ⇒ Object

Clean up subscriptions for a client



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# File 'lib/faye/redis/subscription_manager.rb', line 162

def cleanup_client_subscriptions(client_id)
  unsubscribe_all(client_id)
end

#get_client_subscriptions(client_id, &callback) ⇒ Object

Get all channels a client is subscribed to



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# File 'lib/faye/redis/subscription_manager.rb', line 93

def get_client_subscriptions(client_id, &callback)
  channels = @connection.with_redis do |redis|
    redis.smembers(client_subscriptions_key(client_id))
  end

  EventMachine.next_tick { callback.call(channels) } if callback
  channels
rescue => e
  log_error("Failed to get subscriptions for client #{client_id}: #{e.message}")
  EventMachine.next_tick { callback.call([]) } if callback
  []
end

#get_pattern_subscribers(channel) ⇒ Object

Get subscribers matching wildcard patterns



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# File 'lib/faye/redis/subscription_manager.rb', line 127

def get_pattern_subscribers(channel)
  patterns = @connection.with_redis do |redis|
    redis.smembers(patterns_key)
  end

  matching_clients = []
  patterns.each do |pattern|
    if channel_matches_pattern?(channel, pattern)
      clients = @connection.with_redis do |redis|
        redis.smembers(channel_subscribers_key(pattern))
      end
      matching_clients.concat(clients)
    end
  end

  matching_clients.uniq
rescue => e
  log_error("Failed to get pattern subscribers for channel #{channel}: #{e.message}")
  []
end

#get_subscribers(channel, &callback) ⇒ Object

Get all clients subscribed to a channel



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# File 'lib/faye/redis/subscription_manager.rb', line 107

def get_subscribers(channel, &callback)
  # Get direct subscribers
  direct_subscribers = @connection.with_redis do |redis|
    redis.smembers(channel_subscribers_key(channel))
  end

  # Get pattern subscribers
  pattern_subscribers = get_pattern_subscribers(channel)

  all_subscribers = (direct_subscribers + pattern_subscribers).uniq

  EventMachine.next_tick { callback.call(all_subscribers) } if callback
  all_subscribers
rescue => e
  log_error("Failed to get subscribers for channel #{channel}: #{e.message}")
  EventMachine.next_tick { callback.call([]) } if callback
  []
end

#subscribe(client_id, channel, &callback) ⇒ Object

Subscribe a client to a channel



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# File 'lib/faye/redis/subscription_manager.rb', line 12

def subscribe(client_id, channel, &callback)
  timestamp = Time.now.to_i

  @connection.with_redis do |redis|
    redis.multi do |multi|
      # Add channel to client's subscriptions
      multi.sadd?(client_subscriptions_key(client_id), channel)

      # Add client to channel's subscribers
      multi.sadd?(channel_subscribers_key(channel), client_id)

      # Store subscription metadata
      multi.hset(
        subscription_key(client_id, channel),
        'subscribed_at', timestamp,
        'channel', channel,
        'client_id', client_id
      )

      # Handle wildcard patterns
      if channel.include?('*')
        multi.sadd?(patterns_key, channel)
      end
    end
  end

  EventMachine.next_tick { callback.call(true) } if callback
rescue => e
  log_error("Failed to subscribe client #{client_id} to #{channel}: #{e.message}")
  EventMachine.next_tick { callback.call(false) } if callback
end

#unsubscribe(client_id, channel, &callback) ⇒ Object

Unsubscribe a client from a channel



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# File 'lib/faye/redis/subscription_manager.rb', line 45

def unsubscribe(client_id, channel, &callback)
  @connection.with_redis do |redis|
    redis.multi do |multi|
      # Remove channel from client's subscriptions
      multi.srem?(client_subscriptions_key(client_id), channel)

      # Remove client from channel's subscribers
      multi.srem?(channel_subscribers_key(channel), client_id)

      # Delete subscription metadata
      multi.del(subscription_key(client_id, channel))
    end
  end

  # Clean up wildcard pattern if no more subscribers
  if channel.include?('*')
    cleanup_pattern_if_unused(channel)
  end

  EventMachine.next_tick { callback.call(true) } if callback
rescue => e
  log_error("Failed to unsubscribe client #{client_id} from #{channel}: #{e.message}")
  EventMachine.next_tick { callback.call(false) } if callback
end

#unsubscribe_all(client_id, &callback) ⇒ Object

Unsubscribe a client from all channels



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# File 'lib/faye/redis/subscription_manager.rb', line 71

def unsubscribe_all(client_id, &callback)
  # Get all channels the client is subscribed to
  get_client_subscriptions(client_id) do |channels|
    if channels.empty?
      callback.call(true) if callback
    else
      # Unsubscribe from each channel
      remaining = channels.size
      channels.each do |channel|
        unsubscribe(client_id, channel) do
          remaining -= 1
          callback.call(true) if callback && remaining == 0
        end
      end
    end
  end
rescue => e
  log_error("Failed to unsubscribe client #{client_id} from all channels: #{e.message}")
  EventMachine.next_tick { callback.call(false) } if callback
end