# File lib/em-hiredis/pubsub_client.rb, line 5 def initialize(host='localhost', port='6379', password=nil, db=nil) @subs, @psubs = [], [] @pubsub_defs = Hash.new { |h,k| h[k] = [] } super end
# File lib/em-hiredis/pubsub_client.rb, line 11 def connect @sub_callbacks = Hash.new { |h, k| h[k] = [] } @psub_callbacks = Hash.new { |h, k| h[k] = [] } # Resubsubscribe to channels on reconnect on(:reconnected) { raw_send_command(:subscribe, @subs) if @subs.any? raw_send_command(:psubscribe, @psubs) if @psubs.any? } super end
Pattern subscribe to a pubsub channel
If an optional proc / block is provided then it will be called (with the channel name and message) when a message is received on a matching channel
@return [Deferrable] Redis psubscribe call
# File lib/em-hiredis/pubsub_client.rb, line 84 def psubscribe(pattern, proc = nil, &block) if cb = proc || block @psub_callbacks[pattern] << cb end @psubs << pattern raw_send_command(:psubscribe, [pattern]) return pubsub_deferrable(pattern) end
Pattern unsubscribe all callbacks for a given pattern
@return [Deferrable] Redis punsubscribe call
# File lib/em-hiredis/pubsub_client.rb, line 97 def punsubscribe(pattern) @psub_callbacks.delete(pattern) @psubs.delete(pattern) raw_send_command(:punsubscribe, [pattern]) return pubsub_deferrable(pattern) end
Unsubscribe a given callback from a pattern. Will unsubscribe from redis if there are no remaining subscriptions on this pattern
@return [Deferrable] Succeeds when the punsubscribe has completed or
fails if callback could not be found. Note that success may happen immediately in the case that there are other callbacks for the same pattern (and therefore no punsubscription from redis is necessary)
# File lib/em-hiredis/pubsub_client.rb, line 112 def punsubscribe_proc(pattern, proc) df = EM::DefaultDeferrable.new if @psub_callbacks[pattern].delete(proc) if @psub_callbacks[pattern].any? # Succeed deferrable immediately - no need to punsubscribe df.succeed else punsubscribe(pattern).callback { |_| df.succeed } end else df.fail end return df end
Subscribe to a pubsub channel
If an optional proc / block is provided then it will be called when a message is received on this channel
@return [Deferrable] Redis subscribe call
# File lib/em-hiredis/pubsub_client.rb, line 31 def subscribe(channel, proc = nil, &block) if cb = proc || block @sub_callbacks[channel] << cb end @subs << channel raw_send_command(:subscribe, [channel]) return pubsub_deferrable(channel) end
Unsubscribe all callbacks for a given channel
@return [Deferrable] Redis unsubscribe call
# File lib/em-hiredis/pubsub_client.rb, line 44 def unsubscribe(channel) @sub_callbacks.delete(channel) @subs.delete(channel) raw_send_command(:unsubscribe, [channel]) return pubsub_deferrable(channel) end
Unsubscribe a given callback from a channel. Will unsubscribe from redis if there are no remaining subscriptions on this channel
@return [Deferrable] Succeeds when the unsubscribe has completed or
fails if callback could not be found. Note that success may happen immediately in the case that there are other callbacks for the same channel (and therefore no unsubscription from redis is necessary)
# File lib/em-hiredis/pubsub_client.rb, line 59 def unsubscribe_proc(channel, proc) df = EM::DefaultDeferrable.new if @sub_callbacks[channel].delete(proc) if @sub_callbacks[channel].any? # Succeed deferrable immediately - no need to unsubscribe df.succeed else unsubscribe(channel).callback { |_| df.succeed } end else df.fail end return df end