650 lines
No EOL
21 KiB
Python
650 lines
No EOL
21 KiB
Python
"""
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Interfaces which are implemented by various classes within LBRYnet.
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"""
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from zope.interface import Interface
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class IPeerFinder(Interface):
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"""
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Used to find peers by sha384 hashes which they claim to be associated with.
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"""
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def find_peers_for_blob(self, blob_hash):
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"""
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Look for peers claiming to be associated with a sha384 hashsum.
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@param blob_hash: The sha384 hashsum to use to look up peers.
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@type blob_hash: string, hex encoded
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@return: a Deferred object which fires with a list of Peer objects
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@rtype: Deferred which fires with [Peer]
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"""
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class IRequestSender(Interface):
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"""
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Used to connect to a peer, send requests to it, and return the responses to those requests.
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"""
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def add_request(self, request):
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"""
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Add a request to the next message that will be sent to the peer
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@param request: a request to be sent to the peer in the next message
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@type request: ClientRequest
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@return: Deferred object which will callback with the response to this request, a dict
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@rtype: Deferred which fires with dict
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"""
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def add_blob_request(self, blob_request):
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"""
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Add a request for a blob to the next message that will be sent to the peer.
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This will cause the protocol to call blob_request.write(data) for all incoming
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data, after the response message has been parsed out, until blob_request.finished_deferred fires.
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@param blob_request: the request for the blob
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@type blob_request: ClientBlobRequest
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@return: Deferred object which will callback with the response to this request
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@rtype: Deferred which fires with dict
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"""
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class IRequestCreator(Interface):
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"""
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Send requests, via an IRequestSender, to peers.
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"""
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def send_next_request(self, peer, protocol):
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"""
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Create a Request object for the peer and then give the protocol that request.
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@param peer: the Peer object which the request will be sent to.
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@type peer: Peer
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@param protocol: the protocol to pass the request to.
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@type protocol: object which implements IRequestSender
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@return: Deferred object which will callback with True or False depending on whether a Request was sent
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@rtype: Deferred which fires with boolean
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"""
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def get_new_peers(self):
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"""
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Get some new peers which the request creator wants to send requests to.
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@return: Deferred object which will callback with [Peer]
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@rtype: Deferred which fires with [Peer]
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"""
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class IMetadataHandler(Interface):
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"""
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Get metadata for the IDownloadManager.
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"""
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def get_initial_blobs(self):
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"""
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Return metadata about blobs that are known to be associated with the stream at the time that the
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stream is set up.
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@return: Deferred object which will call back with a list of BlobInfo objects
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@rtype: Deferred which fires with [BlobInfo]
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"""
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def final_blob_num(self):
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"""
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If the last blob in the stream is known, return its blob_num. Otherwise, return None.
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@return: integer representing the final blob num in the stream, or None
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@rtype: integer or None
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"""
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class IDownloadManager(Interface):
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"""
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Manage the downloading of an associated group of blobs, referred to as a stream.
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These objects keep track of metadata about the stream, are responsible for starting and stopping
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other components, and handle communication between other components.
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"""
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def start_downloading(self):
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"""
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Load the initial metadata about the stream and then start the other components.
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@return: Deferred which fires when the other components have been started.
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@rtype: Deferred which fires with boolean
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"""
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def resume_downloading(self):
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"""
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Start the other components after they have been stopped.
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@return: Deferred which fires when the other components have been started.
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@rtype: Deferred which fires with boolean
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"""
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def pause_downloading(self):
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"""
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Stop the other components.
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@return: Deferred which fires when the other components have been stopped.
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@rtype: Deferred which fires with boolean
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"""
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def add_blobs_to_download(self, blobs):
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"""
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Add blobs to the list of blobs that should be downloaded
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@param blobs: list of BlobInfos that are associated with the stream being downloaded
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@type blobs: [BlobInfo]
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@return: DeferredList which fires with the result of adding each previously unknown BlobInfo
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to the list of known BlobInfos.
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@rtype: DeferredList which fires with [(boolean, Failure/None)]
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"""
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def stream_position(self):
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"""
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Returns the blob_num of the next blob needed in the stream.
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If the stream already has all of the blobs it needs, then this will return the blob_num
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of the last blob in the stream plus 1.
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@return: the blob_num of the next blob needed, or the last blob_num + 1.
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@rtype: integer
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"""
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def needed_blobs(self):
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"""
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Returns a list of BlobInfos representing all of the blobs that the stream still needs to download.
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@return: the list of BlobInfos representing blobs that the stream still needs to download.
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@rtype: [BlobInfo]
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"""
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def final_blob_num(self):
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"""
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If the last blob in the stream is known, return its blob_num. If not, return None.
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@return: The blob_num of the last blob in the stream, or None if it is unknown.
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@rtype: integer or None
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"""
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def handle_blob(self, blob_num):
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"""
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This function is called when the next blob in the stream is ready to be handled, whatever that may mean.
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@param blob_num: The blob_num of the blob that is ready to be handled.
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@type blob_num: integer
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@return: A Deferred which fires when the blob has been 'handled'
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@rtype: Deferred which can fire with anything
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"""
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class IConnectionManager(Interface):
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"""
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Connects to peers so that IRequestCreators can send their requests.
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"""
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def get_next_request(self, peer, protocol):
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"""
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Ask all IRequestCreators belonging to this object to create a Request for peer and give it to protocol
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@param peer: the peer which the request will be sent to.
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@type peer: Peer
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@param protocol: the protocol which the request should be sent to by the IRequestCreator.
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@type protocol: IRequestSender
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@return: Deferred object which will callback with True or False depending on whether the IRequestSender
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should send the request or hang up
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@rtype: Deferred which fires with boolean
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"""
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def protocol_disconnected(self, peer, protocol):
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"""
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Inform the IConnectionManager that the protocol has been disconnected
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@param peer: The peer which the connection was to.
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@type peer: Peer
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@param protocol: The protocol which was disconnected.
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@type protocol: Protocol
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@return: None
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"""
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class IProgressManager(Interface):
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"""
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Responsible for keeping track of the progress of the download.
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Specifically, it is their responsibility to decide which blobs need to be downloaded and keep track of
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the progress of the download
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"""
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def stream_position(self):
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"""
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Returns the blob_num of the next blob needed in the stream.
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If the stream already has all of the blobs it needs, then this will return the blob_num
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of the last blob in the stream plus 1.
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@return: the blob_num of the next blob needed, or the last blob_num + 1.
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@rtype: integer
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"""
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def needed_blobs(self):
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"""
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Returns a list of BlobInfos representing all of the blobs that the stream still needs to download.
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@return: the list of BlobInfos representing blobs that the stream still needs to download.
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@rtype: [BlobInfo]
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"""
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def blob_downloaded(self, blob, blob_info):
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"""
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Mark that a blob has been downloaded and does not need to be downloaded again
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@param blob: the blob that has been downloaded.
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@type blob: Blob
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@param blob_info: the metadata of the blob that has been downloaded.
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@type blob_info: BlobInfo
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@return: None
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"""
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class IBlobHandler(Interface):
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"""
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Responsible for doing whatever should be done with blobs that have been downloaded.
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"""
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def blob_downloaded(self, blob, blob_info):
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"""
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Do whatever the downloader is supposed to do when a blob has been downloaded
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@param blob: The downloaded blob
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@type blob: Blob
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@param blob_info: The metadata of the downloaded blob
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@type blob_info: BlobInfo
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@return: A Deferred which fires when the blob has been handled.
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@rtype: Deferred which can fire with anything
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"""
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class IRateLimited(Interface):
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"""
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Have the ability to be throttled (temporarily stopped).
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"""
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def throttle_upload(self):
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"""
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Stop uploading data until unthrottle_upload is called.
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@return: None
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"""
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def throttle_download(self):
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"""
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Stop downloading data until unthrottle_upload is called.
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@return: None
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"""
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def unthrottle_upload(self):
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"""
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Resume uploading data at will until throttle_upload is called.
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@return: None
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"""
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def unthrottle_downlad(self):
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"""
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Resume downloading data at will until throttle_download is called.
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@return: None
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"""
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class IRateLimiter(Interface):
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"""
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Can keep track of download and upload rates and can throttle objects which implement the
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IRateLimited interface.
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"""
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def report_dl_bytes(self, num_bytes):
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"""
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Inform the IRateLimiter that num_bytes have been downloaded.
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@param num_bytes: the number of bytes that have been downloaded
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@type num_bytes: integer
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@return: None
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"""
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def report_ul_bytes(self, num_bytes):
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"""
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Inform the IRateLimiter that num_bytes have been uploaded.
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@param num_bytes: the number of bytes that have been uploaded
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@type num_bytes: integer
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@return: None
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"""
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def register_protocol(self, protocol):
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"""
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Register an IRateLimited object with the IRateLimiter so that the IRateLimiter can throttle it
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@param protocol: An object implementing the interface IRateLimited
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@type protocol: Object implementing IRateLimited
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@return: None
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"""
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def unregister_protocol(self, protocol):
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"""
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Unregister an IRateLimited object so that it won't be throttled any more.
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@param protocol: An object implementing the interface IRateLimited, which was previously registered with this
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IRateLimiter via "register_protocol"
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@type protocol: Object implementing IRateLimited
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@return: None
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"""
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class IRequestHandler(Interface):
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"""
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Pass client queries on to IQueryHandlers
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"""
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def register_query_handler(self, query_handler, query_identifiers):
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"""
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Register a query handler, which will be passed any queries that
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match any of the identifiers in query_identifiers
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@param query_handler: the object which will handle queries matching the given query_identifiers
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@type query_handler: Object implementing IQueryHandler
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@param query_identifiers: A list of strings representing the query identifiers
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for queries that should be passed to this handler
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@type query_identifiers: [string]
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@return: None
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"""
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def register_blob_sender(self, blob_sender):
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"""
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Register a blob sender which will be called after the response has
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finished to see if it wants to send a blob
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@param blob_sender: the object which will upload the blob to the client.
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@type blob_sender: IBlobSender
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@return: None
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"""
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class IBlobSender(Interface):
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"""
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Upload blobs to clients.
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"""
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def send_blob_if_requested(self, consumer):
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"""
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If a blob has been requested, write it to 'write' func of the consumer and then
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callback the returned deferred when it has all been written
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@param consumer: the object implementing IConsumer which the file will be written to
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@type consumer: object which implements IConsumer
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@return: Deferred which will fire when the blob sender is done, which will be
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immediately if no blob should be sent.
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@rtype: Deferred which fires with anything
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"""
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class IQueryHandler(Interface):
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"""
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Respond to requests from clients.
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"""
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def register_with_request_handler(self, request_handler, peer):
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"""
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Register with the request handler to receive queries
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@param request_handler: the object implementing IRequestHandler to register with
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@type request_handler: object implementing IRequestHandler
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@param peer: the Peer which this query handler will be answering requests from
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@type peer: Peer
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@return: None
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"""
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def handle_queries(self, queries):
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"""
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Return responses to queries from the client.
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@param queries: a dict representing the query_identifiers:queries that should be handled
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@type queries: {string: dict}
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@return: a Deferred object which will callback with a dict of query responses
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@rtype: Deferred which fires with {string: dict}
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"""
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class IQueryHandlerFactory(Interface):
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"""
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Construct IQueryHandlers to handle queries from each new client that connects.
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"""
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def build_query_handler(self):
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"""
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Create an object that implements the IQueryHandler interface
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@return: object that implements IQueryHandler
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"""
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class IStreamDownloaderOptions(Interface):
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def get_downloader_options(self, sd_validator, payment_rate_manager):
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"""
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Return the list of options that can be used to modify IStreamDownloader behavior
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@param sd_validator: object containing stream metadata, which the options may depend on
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@type sd_validator: object which implements IStreamDescriptorValidator interface
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@param payment_rate_manager: The payment rate manager currently in effect for the downloader
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@type payment_rate_manager: PaymentRateManager
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@return: [DownloadOption]
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@rtype: [DownloadOption]
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"""
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class IStreamDownloaderFactory(Interface):
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"""
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Construct IStreamDownloaders and provide options that will be passed to those IStreamDownloaders.
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"""
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def can_download(self, sd_validator, payment_rate_manager):
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"""
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Decide whether the downloaders created by this factory can download the stream described by sd_validator
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@param sd_validator: object containing stream metadata
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@type sd_validator: object which implements IStreamDescriptorValidator interface
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@param payment_rate_manager: The payment rate manager currently in effect for the downloader
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@type payment_rate_manager: PaymentRateManager
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@return: True if the downloaders can download the stream, False otherwise
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@rtype: bool
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"""
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def make_downloader(self, sd_validator, options, payment_rate_manager):
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"""
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Create an object that implements the IStreamDownloader interface
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@param sd_validator: object containing stream metadata which will be given to the IStreamDownloader
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@type sd_validator: object which implements IStreamDescriptorValidator interface
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@param options: a list of values that will be used by the IStreamDownloaderFactory to
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construct the IStreamDownloader. the options are in the same order as they were given
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by get_downloader_options.
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@type options: [Object]
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@param payment_rate_manager: the PaymentRateManager which the IStreamDownloader should use.
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@type payment_rate_manager: PaymentRateManager
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@return: a Deferred which fires with the downloader object
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@rtype: Deferred which fires with IStreamDownloader
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"""
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def get_description(self):
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"""
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Return a string detailing what this downloader does with streams
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@return: short description of what the IStreamDownloader does.
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@rtype: string
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"""
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class IStreamDownloader(Interface):
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"""
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Use metadata and data from the network for some useful purpose.
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"""
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def start(self):
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"""
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start downloading the stream
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@return: a Deferred which fires when the stream is finished downloading, or errbacks when the stream is
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cancelled.
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@rtype: Deferred which fires with anything
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"""
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def insufficient_funds(self, err):
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"""
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this function informs the stream downloader that funds are too low to finish downloading.
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@return: None
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"""
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class IStreamDescriptorValidator(Interface):
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"""
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Pull metadata out of Stream Descriptor Files and perform some
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validation on the metadata.
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"""
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def validate(self):
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"""
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@return: whether the stream descriptor passes validation checks
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@rtype: boolean
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"""
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def info_to_show(self):
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"""
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@return: A list of tuples representing metadata that should be presented to the user before starting the
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download
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@rtype: [(string, string)]
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"""
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class IWallet(Interface):
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"""
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Send and receive payments.
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To send a payment, a payment reservation must be obtained first. This guarantees that a payment
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isn't promised if it can't be paid. When the service in question is rendered, the payment
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reservation must be given to the IWallet along with the final price. The reservation can also
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be canceled.
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"""
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def stop(self):
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"""
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Send out any unsent payments, close any connections, and stop checking for incoming payments.
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@return: None
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"""
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def start(self):
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"""
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Set up any connections and start checking for incoming payments
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@return: None
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"""
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def get_info_exchanger(self):
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"""
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Get the object that will be used to find the payment addresses of peers.
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@return: The object that will be used to find the payment addresses of peers.
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@rtype: An object implementing IRequestCreator
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"""
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def get_wallet_info_query_handler_factory(self):
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"""
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Get the object that will be used to give our payment address to peers.
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This must return an object implementing IQueryHandlerFactory. It will be used to
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create IQueryHandler objects that will be registered with an IRequestHandler.
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@return: The object that will be used to give our payment address to peers.
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@rtype: An object implementing IQueryHandlerFactory
|
|
"""
|
|
|
|
def reserve_points(self, peer, amount):
|
|
"""
|
|
Ensure a certain amount of points are available to be sent as payment, before the service is rendered
|
|
|
|
@param peer: The peer to which the payment will ultimately be sent
|
|
@type peer: Peer
|
|
|
|
@param amount: The amount of points to reserve
|
|
@type amount: float
|
|
|
|
@return: A ReservedPoints object which is given to send_points once the service has been rendered
|
|
@rtype: ReservedPoints
|
|
"""
|
|
|
|
def cancel_point_reservation(self, reserved_points):
|
|
"""
|
|
Return all of the points that were reserved previously for some ReservedPoints object
|
|
|
|
@param reserved_points: ReservedPoints previously returned by reserve_points
|
|
@type reserved_points: ReservedPoints
|
|
|
|
@return: None
|
|
"""
|
|
|
|
def send_points(self, reserved_points, amount):
|
|
"""
|
|
Schedule a payment to be sent to a peer
|
|
|
|
@param reserved_points: ReservedPoints object previously returned by reserve_points.
|
|
@type reserved_points: ReservedPoints
|
|
|
|
@param amount: amount of points to actually send, must be less than or equal to the
|
|
amount reserved in reserved_points
|
|
@type amount: float
|
|
|
|
@return: Deferred which fires when the payment has been scheduled
|
|
@rtype: Deferred which fires with anything
|
|
"""
|
|
|
|
def get_balance(self):
|
|
"""
|
|
Return the balance of this wallet
|
|
|
|
@return: Deferred which fires with the balance of the wallet
|
|
@rtype: Deferred which fires with float
|
|
"""
|
|
|
|
def add_expected_payment(self, peer, amount):
|
|
"""
|
|
Increase the number of points expected to be paid by a peer
|
|
|
|
@param peer: the peer which is expected to pay the points
|
|
@type peer: Peer
|
|
|
|
@param amount: the amount of points expected to be paid
|
|
@type amount: float
|
|
|
|
@return: None
|
|
""" |