Class: NLHue::Bridge

Inherits:
Object
  • Object
show all
Defined in:
lib/nlhue/bridge.rb

Overview

A class representing a Hue bridge. A Bridge object may not refer to an actual Hue bridge if verify() hasn’t succeeded. Manages a list of lights and groups on the bridge. HTTP requests to the bridge are queued and sent one at a time to prevent overloading the bridge’s CPU.

Constant Summary collapse

RATE_LIMIT =

Seconds to wait after an update round finishes before sending more updates to lights and groups.

0.2
@@bridge_cbs =

callbacks notified when a bridge has its first successful update

[]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(addr, serial = nil) ⇒ Bridge

addr - The IP address or hostname of the Hue bridge. serial - The serial number of the bridge, if available (parsed from the USN header in a UPnP response)



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# File 'lib/nlhue/bridge.rb', line 85

def initialize addr, serial = nil
	@addr = addr
	@verified = false
	@username = nil
	@name = nil
	@config = nil
	@registered = false
	@lights = {}
	@groups = {}
	@scenes = {}
	@whitelist = {}
	@lightscan = {'lastscan' => 'none'}
	if serial && serial =~ /^[0-9A-Fa-f]{12}$/
		@serial = serial.downcase
	else
		@serial = nil
	end

	@request_queue = NLHue::RequestQueue.new addr, 2

	@update_timer = nil
	@update_callbacks = []

	@rate_timer = nil
	@rate_targets = {}
	@rate_proc = proc do
		if @rate_targets.empty?
			log "No targets, canceling rate timer." # XXX
			@rate_timer.cancel if @rate_timer
			@rate_timer = nil
		else
			log "Sending targets from rate timer." # XXX
			send_targets do
				@rate_timer = EM::Timer.new(RATE_LIMIT, @rate_proc)
			end
		end
	end
end

Instance Attribute Details

#addr ⇒ Object

Returns the value of attribute addr.



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# File 'lib/nlhue/bridge.rb', line 40

def addr
  @addr
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/nlhue/bridge.rb', line 40

def name
  @name
end

#serial ⇒ Object (readonly)

Returns the value of attribute serial.



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# File 'lib/nlhue/bridge.rb', line 40

def serial
  @serial
end

#username ⇒ Object

Returns the value of attribute username.



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# File 'lib/nlhue/bridge.rb', line 40

def username
  @username
end

#whitelist ⇒ Object (readonly)

Returns the value of attribute whitelist.



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# File 'lib/nlhue/bridge.rb', line 40

def whitelist
  @whitelist
end

Class Method Details

.add_bridge_callback(&block) ⇒ Object

Adds a callback to be called with a Bridge object and a status each time a Bridge has its first successful update, adds or removes lights or groups, or becomes unregistered. Bridge callbacks will be called after any corresponding :add or :del disco event is delivered. Returns a Proc object that may be passed to remove_update_cb.

Callback parameters: Bridge first update: [Bridge], true

Bridge added/removed lights or groups: [Bridge], true

Bridge unregistered: [Bridge], false



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# File 'lib/nlhue/bridge.rb', line 60

def self.add_bridge_callback &block
	@@bridge_cbs << block
	block
end

.notify_bridge_callbacks(br, status) ⇒ Object

Sends the given bridge to all attached first update callbacks.



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# File 'lib/nlhue/bridge.rb', line 72

def self.notify_bridge_callbacks br, status
	@@bridge_cbs.each do |cb|
		begin
			cb.call br, status
		rescue => e
			log_e e, "Error calling a first update callback"
		end
	end
end

.remove_bridge_callback(cb) ⇒ Object

Removes the given callback (returned by add_bridge_callback) from Bridge first update/unregistration notifications.



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# File 'lib/nlhue/bridge.rb', line 67

def self.remove_bridge_callback cb
	@@bridge_cbs.delete cb
end

Instance Method Details

#add_target(t, &block) ⇒ Object

Schedules a Light, Scene, or Group to have its deferred values sent the next time the rate limiting timer fires, or immediately if the rate limiting timer has expired. Starts the rate limiting timer if it is not running.



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# File 'lib/nlhue/bridge.rb', line 745

def add_target t, &block
	raise 'Target must respond to :send_changes' unless t.respond_to?(:send_changes)
	raise "Target is from #{t.bridge.serial} not this bridge (#{@serial})" unless t.bridge == self

	log "Adding deferred target #{t}" # XXX

	@rate_targets[t] ||= []
	@rate_targets[t] << block if block_given?

	# TODO: Use different timers for different request types
	unless @rate_timer
		log "No rate timer -- sending targets on next tick" # XXX

		# Waiting until the next tick allows multiple
		# updates to be queued in the current tick that
		# will all go out at the same time.
		EM.next_tick do
			log "It's next tick -- sending targets now" # XXX
			send_targets
		end

		log "Setting rate timer"
		@rate_timer = EM::Timer.new(RATE_LIMIT, @rate_proc)
	else
		log "Rate timer is set -- not sending targets now" # XXX
	end
end

#add_update_callback(&cb) ⇒ Object

Adds a callback to be notified when a subscription update is received, or when a subscription update fails. The return value may be passed to remove_update_callback.

Callback parameters: Update successful: true, [lights or groups changed: true/false]

Update failed: false, [exception]



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# File 'lib/nlhue/bridge.rb', line 253

def add_update_callback &cb
	@update_callbacks << cb
	cb
end

#check_json(response) ⇒ Object

Checks for a valid JSON-containing response from an HTTP request method, returns an error if invalid or no response. Does not consider non-200 HTTP response codes as errors. Returns true and the received JSON if no error occurred, or false and an exception if an error did occur. Marks this bridge as not registered if there is a NotRegisteredError.



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# File 'lib/nlhue/bridge.rb', line 632

def check_json response
	status = false
	result = nil

	begin
		raise 'No response received.' if response == false

		if response.is_a?(Hash)
			status = true
			result_msgs = []

			result = JSON.parse response[:content]
			if result.is_a? Array
				result.each do |v|
					if v.is_a?(Hash) && v['error'].is_a?(Hash); then
						status = false
						result_msgs << v['error']['description']
					end
				end
			end

			unless status
				if result_msgs.include?('link button not pressed')
					raise LinkButtonError.new
				elsif result_msgs.include?('unauthorized user')
					was_reg = @registered
					@registered = false
					Bridge.notify_bridge_callbacks self, false if was_reg

					raise NotRegisteredError.new
				else
					raise StandardError.new(result_msgs.join(', '))
				end
			end
		end
	rescue => e
		status = false
		result = e
	end

	return status, result
end

#check_username(username) ⇒ Object

Throws errors if the given username is invalid (may not catch all invalid names).



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# File 'lib/nlhue/bridge.rb', line 620

def check_username username
	raise 'Username must be a String' unless username.is_a?(String)
	raise 'Username must be >= 10 characters.' unless username.to_s.length >= 10
	raise 'Spaces are not permitted in usernames.' if username =~ /[[:space:]]/
end

#clean ⇒ Object

Unsubscribes from bridge updates, marks this bridge as unregistered, notifies global bridge callbacks added with add_bridge_callback, then removes references to configuration, lights, groups, and update callbacks.



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# File 'lib/nlhue/bridge.rb', line 604

def clean
	was_updated = updated?
	unsubscribe
	@registered = false

	Bridge.notify_bridge_callbacks self, false if was_updated

	@verified = false
	@config = nil
	@lights.clear
	@groups.clear
	@update_callbacks.clear
end

#create_group(name, lights, &block) ⇒ Object

Creates a new group with the given name and list of lights. The given block will be called with true and a NLHue::Group object on success, false and an error on failure. If group creation succeeds, all bridge callbacks added with Bridge.add_bridge_callback will be notified after the new group is yielded to the block (if a block is given). Note that the group’s name may be changed by the bridge.



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# File 'lib/nlhue/bridge.rb', line 515

def create_group name, lights, &block
	raise "No group name was given" unless name.is_a?(String) && name.length > 0
	raise "No lights were given" unless lights.is_a?(Array) && lights.length > 0

	light_ids = []
	lights.each do |l|
		raise "All given lights must be NLHue::Light objects" unless l.is_a?(Light)
		raise "Light #{l.id} (#{l.name}) is not from this bridge." if l.bridge != self

		light_ids << l.id.to_s
	end

	group_data = { :lights => light_ids, :name => name }.to_json
	post_api '/groups', group_data, :lights do |response|
		status, result = check_json response

		begin
			result = result.first if result.is_a? Array

			if status && result['success']
				id = result['success']['id'].split('/').last.to_i
				raise "Invalid ID received for new group: '#{result['success']['id']}'" unless id > 0

				group = Group.new(self, id, { 'name' => name, 'lights' => light_ids, 'action' => {} })
				group.update do |upstatus, upresult|
					if upstatus
						@groups[id] = group
						Bridge.notify_bridge_callbacks self, true
						yield true, group if block_given?
					else
						yield upstatus, upresult if block_given?
					end
				end
			else
				raise result
			end
		rescue => e
			yield false, e if block_given?
		end
	end
end

#delete_api(subpath, category = nil, &block) ⇒ Object

Makes a DELETE request under the API using this Bridge’s stored username.



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# File 'lib/nlhue/bridge.rb', line 737

def delete_api subpath, category=nil, &block
	@request_queue.delete "/api/#{api_key}#{subpath}", category, &block
end

#delete_group(group, &block) ⇒ Object

Deletes the given NLHue::Group on this bridge. Raises an exception if the group is group 0. Calls the given block with true and a message on success, or false and an error on failure. Bridge notification callbacks will be called after the result is yielded.



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# File 'lib/nlhue/bridge.rb', line 562

def delete_group group, &block
	raise "No group was given to delete" if group.nil?
	raise "Group must be a NLHue::Group object" unless group.is_a?(Group)
	raise "Group is not from this bridge" unless group.bridge == self
	raise "Cannot delete group 0" if group.id == 0

	delete_api "/groups/#{group.id}", :lights do |response|
		status, result = check_json response

		if status
			@groups.delete group.id
		end

		yield status, result if block_given?

		if status
			Bridge.notify_bridge_callbacks self, true
		end
	end
end

#find_scene(prefix) ⇒ Object

Returns the scene with an exactly matching ID, the most recently created Scene with a name starting with prefix (that is, the scene occurring last in an alphanumeric sort), or nil if no match was found.



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# File 'lib/nlhue/bridge.rb', line 497

def find_scene(prefix)
	return @scenes[prefix] if @scenes.include? prefix

	prefix = prefix.downcase
	@scenes.select{|id, scene|
		scene.name.downcase.start_with?(prefix)
	}.values.max_by{|s|
		s.name
	}
end

#get_api(subpath, category = nil, &block) ⇒ Object

Makes a GET request under the API using this Bridge’s stored username.



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# File 'lib/nlhue/bridge.rb', line 719

def get_api subpath, category=nil, &block
	@request_queue.get "/api/#{api_key}#{subpath}", &block
end

#groups ⇒ Object

Returns a Hash mapping group IDs to Group objects representing the groups known to this bridge, including the default group 0 that contains all lights from this bridge.



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# File 'lib/nlhue/bridge.rb', line 472

def groups
	@groups.clone
end

#lights ⇒ Object

Returns a Hash mapping light IDs to Light objects, representing the lights known to the Hue bridge.



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# File 'lib/nlhue/bridge.rb', line 460

def lights
	@lights.clone
end

#num_groups ⇒ Object

The number of groups known to this bridge, including the default group that contains all lights known to the bridge.



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# File 'lib/nlhue/bridge.rb', line 478

def num_groups
	@groups.length
end

#num_lights ⇒ Object

The number of lights known to this bridge.



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# File 'lib/nlhue/bridge.rb', line 465

def num_lights
	@lights.length
end

#num_scenes ⇒ Object

The number of scenes found on the bridge.



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# File 'lib/nlhue/bridge.rb', line 489

def num_scenes
	@scenes.length
end

#post_api(subpath, data, category = nil, content_type = nil, &block) ⇒ Object

Makes a POST request under the API using this Bridge’s stored username.



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# File 'lib/nlhue/bridge.rb', line 725

def post_api subpath, data, category=nil, content_type=nil, &block
	@request_queue.post "/api/#{api_key}#{subpath}", data, category, content_type, &block
end

#put_api(subpath, data, category = nil, content_type = nil, &block) ⇒ Object

Makes a PUT request under the API using this Bridge’s stored username.



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# File 'lib/nlhue/bridge.rb', line 731

def put_api subpath, data, category=nil, content_type=nil, &block
	@request_queue.put "/api/#{api_key}#{subpath}", data, category, content_type, &block
end

#register(devicetype, &block) ⇒ Object

Attempts to register with the Bridge. The block will be called with true and the result array if registration succeeds, false and an Exception if not. If registration succeeds, the Bridge object’s current username will be set to the username returned by the bridge. If the Bridge is already registered it will not be re-registered, and the block will be called with true and the current username. Call #update after registration succeeds. #registered? will not return true until #update has succeeded.

Raises:



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# File 'lib/nlhue/bridge.rb', line 180

def register devicetype, &block
	raise NotVerifiedError.new unless @verified

	if @username && @registered
		yield true, @username
		return
	end

	msg = %Q{{"devicetype":#{devicetype.to_json}}}
	@request_queue.post '/api', msg, :registration, nil, 6 do |response|
		status, result = check_json response

		if status
			@username = result.first['success']['username']
		end

		yield status, result
	end
end

#registered? ⇒ Boolean

Returns whether the Bridge object believes it is registered with its associated Hue bridge. Set to true when #update or #register succeeds, false if a NotRegisteredError occurs.

Returns:

  • (Boolean) 


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# File 'lib/nlhue/bridge.rb', line 454

def registered?
	@registered
end

#remove_update_callback(cb) ⇒ Object

Removes the given callback (returned by add_update_callback) from the list of callbacks notified with subscription events.



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# File 'lib/nlhue/bridge.rb', line 260

def remove_update_callback cb
	@update_callbacks.delete cb
end

#scan_active? ⇒ Boolean

Returns true if a scan for lights is active (as of the last call to #update), false otherwise.

Returns:

  • (Boolean) 


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# File 'lib/nlhue/bridge.rb', line 427

def scan_active?
	@lightscan['lastscan'] == 'active'
end

#scan_lights(&block) ⇒ Object

Initiates a scan for new lights. If a block is given, yields true if the scan was started, an exception if there was an error.



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# File 'lib/nlhue/bridge.rb', line 374

def scan_lights &block
	post_api '/lights', nil do |response|
		begin
			status, result = check_json response
			@lightscan['lastscan'] = 'active' if status
			yield status if block_given?
		rescue => e
			yield e
		end
	end
end

#scan_status(request = false, &block) ⇒ Object

Calls the given block (if given) with true and the last known light scan status from the bridge. Requests the current scan status from the bridge if request is true. The block will be called with false and an exception if an error occurs during a request. Returns the last known scan status.

The scan status is a Hash with the following form: { ‘1’ => { ‘name’ => ‘New Light 1’ }, # If new lights were found ‘2’ => { ‘name’ => ‘New Light 2’ }, ‘lastscan’ => ‘active’/‘none’/ISO8601:2004 }



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# File 'lib/nlhue/bridge.rb', line 398

def scan_status request=false, &block
	if request
		get_api '/lights/new' do |response|
			begin
				status, result = check_json response

				if status
					# Update group 0 if new lights are found or when a scan completes
					if @lightscan['lastscan'] == 'active' && result['lastscan'] != 'active'
						puts "Updating group 0" # XXX
						@groups[0].update
					end
					@lightscan = result
				end

				yield status, result if block_given?
			rescue => e
				yield e
			end
		end
	else
		yield true, @lightscan if block_given?
	end

	@lightscan unless block_given?
end

#scenes ⇒ Object

Returns a Hash mapping scene IDs to Scene objects. Unlike lights and groups, scenes have String IDs.



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# File 'lib/nlhue/bridge.rb', line 484

def scenes
	@scenes.clone
end

#subscribe(interval = 1) ⇒ Object

Starts a timer that retrieves the current state of the bridge every interval seconds. Does nothing if this Bridge is already subscribed.



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# File 'lib/nlhue/bridge.rb', line 225

def subscribe interval=1
	return if @update_timer

	update_proc = proc {
		update do |status, result|
			@update_timer = EM::Timer.new(interval, update_proc) if @update_timer
		end
	}

	@update_timer = EM::Timer.new(interval, update_proc)
end

#subscribed? ⇒ Boolean

Returns true if this bridge is subscribed (i.e. periodically polling the Hue bridge for updates).

Returns:

  • (Boolean) 


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# File 'lib/nlhue/bridge.rb', line 447

def subscribed?
	!!@update_timer
end

#to_h(include_config = false) ⇒ Object

Returns a Hash with information about this bridge: { :addr => “[IP address]”, :name => “[name]”, :serial => “[serial number]”, :registered => true/false, :scan => [return value of #scan_status], :lights => [hash containing Light objects (see #lights)], :groups => [hash containing Group objects (see #groups)], :scenes => [hash containing Scene objects (see #scenes)], :config => [raw config from bridge] if include_config }

Do not modify the included lights and groups hashes.



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# File 'lib/nlhue/bridge.rb', line 696

def to_h include_config=false
	h = {
		:addr => @addr,
		:name => @name,
		:serial => @serial,
		:registered => @registered,
		:scan => @lightscan,
		:lights => @lights,
		:groups => @groups,
		:scenes => @scenes,
	}
	h[:config] = @config if include_config
	h
end

#to_json(*args) ⇒ Object

Return value of to_h converted to a JSON string. Options: :include_config => true – include raw config returned by the bridge



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# File 'lib/nlhue/bridge.rb', line 713

def to_json *args
	to_h(args[0].is_a?(Hash) && args[0][:include_config]).to_json(*args)
end

#to_s ⇒ Object

“Hue Bridge: [IP]: [Friendly Name] ([serial]) - N lights”



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# File 'lib/nlhue/bridge.rb', line 676

def to_s
	str = "Hue Bridge: #{@addr}: #{@name} (#{@serial}) - #{@lights.length} lights"
	str << " (#{registered? ? '' : 'un'}registered)"
	str
end

#unregister(username = nil, &block) ⇒ Object

Deletes the given username (or this Bridge object’s current username if username is nil) from the Bridge’s whitelist, sets this Bridge’s username to nil, and sets its registered state to false.

Raises:



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# File 'lib/nlhue/bridge.rb', line 204

def unregister username = nil, &block
	raise NotVerifiedError.new unless @verified

	username ||= @username

	@request_queue.delete "/api/#{username}/config/whitelist/#{username}", :registration, 6 do |response|
		status, result = check_json response

		if @username == username && status
			@registered = false
			@username = nil
			Bridge.notify_bridge_callbacks self, false
		end

		yield status, result
	end
end

#unsubscribe ⇒ Object

Stops the timer started by subscribe(), if one is running.



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# File 'lib/nlhue/bridge.rb', line 238

def unsubscribe
	@update_timer.cancel if @update_timer
	@update_timer = nil
end

#update(&block) ⇒ Object

Updates the Bridge object with the lights, groups, and config of the Hue bridge. Also updates the current light scan status on the first update or if the Bridge thinks a scan is currently active. On success the given block will be called with true and whether the lights/groups were changed, false and an exception on error.



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# File 'lib/nlhue/bridge.rb', line 270

def update &block
	@request_queue.get "/api/#{api_key}", :info do |response|
		status, result = check_json response

		changed = false

		begin
			if status
				first_update = !@registered

				# TODO: Extract a helper method for adding new
				# members to and removing old members from a list

				@config = result
				@config['lights'].each do |id, info|
					id = id.to_i
					if @lights[id].is_a? Light
						@lights[id].handle_json info
					else
						@lights[id] = Light.new(self, id, info)
						changed = true
					end
				end
				@lights.select! do |id, light|
					incl = @config['lights'].include? id.to_s
					changed ||= !incl
					incl
				end

				set_name @config['config']['name'] unless @name
				@serial ||= @config['config']['mac'].gsub(':', '').downcase

				@registered = true

				unless @groups[0].is_a? Group
					@groups[0] = Group.new(self, 0)
					get_api '/groups/0', :info do |response|
						status, result = check_json response
						if status && @groups[0]
							@groups[0].handle_json result
						end
					end
				end

				@config['groups'].each do |id, info|
					if @groups[id.to_i].is_a? Group
						@groups[id.to_i].handle_json info
					else
						@groups[id.to_i] = Group.new(self, id.to_i, info)
						changed = true
					end
				end
				@groups.select! do |id, light|
					incl = @config['groups'].include?(id.to_s) || id == 0
					changed ||= !incl
					incl
				end

				@config['scenes'].each do |id, info|
					if @scenes[id].is_a? Scene
						@scenes[id].handle_json info
					else
						@scenes[id] = Scene.new(self, id, info)
						changed = true
					end
				end
				@scenes.select! do |id, scene|
					incl = @config['scenes'].include?(id.to_s)
					changed ||= !incl
					incl
				end

				wl = @config['config']['whitelist']
				if wl != @whitelist
					@whitelist = wl
					changed = true
				end

				if changed
					@scenes = Hash[@scenes.sort_by{|id, s| s.name}]
				end

				# TODO: schedules, rules, sensors, etc.

				scan_status true if first_update || @lightscan['lastscan'] == 'active'

				Bridge.notify_bridge_callbacks self, true if first_update || changed
			end
		rescue => e
			log_e e, "Bridge #{@serial} update raised an exception"
			status = false
			result = e
		end

		result = changed if status
		notify_update_callbacks status, result

		yield status, result
	end
end

#updated? ⇒ Boolean

Returns whether the Bridge object has had at least one successful update from #update.

Returns:

  • (Boolean) 


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# File 'lib/nlhue/bridge.rb', line 433

def updated?
	@config.is_a? Hash
end

#verified? ⇒ Boolean

Indicates whether verification succeeded. A Hue bridge has been verified to exist at the address given to the constructor or to #addr= if this returns true. Use #verify to perform verification if this returns false.

Returns:

  • (Boolean) 


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# File 'lib/nlhue/bridge.rb', line 441

def verified?
	@verified
end

#verify(&block) ⇒ Object

Calls the given block with true or false if verification by description.xml succeeds or fails. If verification has already been performed, the block will be called immediately with true.



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# File 'lib/nlhue/bridge.rb', line 128

def verify &block
	if @verified
		yield true
		return true
	end

	@request_queue.get '/description.xml', :info, 4 do |result|
		puts "Description result: #{result.inspect}" # XXX
		if result.is_a?(Hash) && result[:status] == 200
			@desc = REXML::Document.new result[:content]
			@desc.write($stdout, 4, true) # XXX
			@desc.elements.each('friendlyName') do |el|
				puts "Friendly name: #{@name}" # XXX
				set_name el.text
			end
			@desc.elements.each('serialNumber') do |el|
				puts "Serial number: #{@serial}" # XXX
				@serial = el.text.downcase
			end
			@desc.elements.each('modelName') do |el|
				puts "modelName: #{el.text}" # XXX
				if el.text.include? 'Philips hue'
					@verified = true
				end
			end

			# FIXME: Delete this line when converted to em-http-request; this
			# works around the empty :content returned by EM::HttpClient
			#
			# See commits:
			# 34110773fc45bfdd56c32972650f9d947d8fac78
			# 6d8d7a0566e3c51c3ab15eb2358dde3e518594d3
			@verified = true
		end

		begin
			yield @verified
		rescue => e
			log_e e, "Error notifying block after verification"
		end
	end
end