def __init__(self, router, r_id):
"""
Creates the camera communicator and ensures the image directory exists.
Args:
router: A reference to the router that this receiver is associated with.
r_id: The string that the router refers to this receiver with.
"""
super(CameraReceiver, self).__init__(router, r_id)
self._photo_dir = utils.get_image_dir()
self._camera_comm = CameraCommunicator()
if not os.path.isdir(self._photo_dir):
self.router.create_transaction(origin = self.r_id,
to_id = "filemanager",
command = "mkdir",
command_args = self._photo_dir)
class CameraReceiver(Receiver):
"""
The receiver that deals with transactions that call for sample images. Has
a camera communicator instance that acts as the interface to the camera.
Attributes:
_photo_dir: The name of the directory where images are stored.
_camera_comm: The camera_communicator instance that allows this receiver
to capture images.
"""
def __init__(self, router, r_id):
"""
Creates the camera communicator and ensures the image directory exists.
Args:
router: A reference to the router that this receiver is associated with.
r_id: The string that the router refers to this receiver with.
"""
super(CameraReceiver, self).__init__(router, r_id)
self._photo_dir = utils.get_image_dir()
self._camera_comm = CameraCommunicator()
if not os.path.isdir(self._photo_dir):
self.router.create_transaction(origin = self.r_id,
to_id = "filemanager",
command = "mkdir",
command_args = self._photo_dir)
def process_transaction(self, transaction):
"""
The method the router calls when a transaction is routed to this receiver.
Args:
transaction: The transaction that is being processed by the receiver.
Commands:
get_image: Takes an image and stores it locally, then changes the
destination to an appropiate receiver to return the image to the
user that requested it.
"""
if transaction.command == "get_image":
timestamp, filename = self._camera_comm.get_sample_image(
transaction.command_args[0])
if(transaction.origin == "gui"):
raise NotImplementedError("GUI not yet implemented")
else:
transaction.to_id = "flickr"
transaction.command = "store"
transaction.command_args = [filename,
transaction.command_args[0],
timestamp]
else:
transaction.log(info = "Unknown command passed to camera receiver: " +
"%s" % transaction.command)
def cleanup(self):
"""
Ensure local resources are freed.
"""
self._camera_comm.cleanup()
del self._camera_comm
