mirror of
https://github.com/markqvist/LXMF.git
synced 2024-12-23 22:29:33 -05:00
Base protocol and message format implemented
This commit is contained in:
Mark Qvist
parent
e45d82d4af
commit
1060b8ac27
2
LICENSE
2
LICENSE
@ -1,6 +1,6 @@
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MIT License
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Copyright (c) 2020 Mark Qvist
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Copyright (c) 2020 Mark Qvist / unsigned.io
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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489
LXMF.py
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489
LXMF.py
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import math
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import time
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import threading
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import RNS
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import RNS.vendor.umsgpack as msgpack
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APP_NAME = "lxmf"
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class LXMessage:
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DRAFT = 0x00
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OUTBOUND = 0x01
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SENDING = 0x02
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SENT = 0x04
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DELIVERED = 0x08
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states = [DRAFT, OUTBOUND, SENDING, SENT, DELIVERED]
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UNKNOWN = 0x00
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PACKET = 0x01
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RESOURCE = 0x02
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representations = [UNKNOWN, PACKET, RESOURCE]
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OPPORTUNISTIC = 0x01
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DIRECT = 0x02
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PROPAGATED = 0x03
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valid_methods = [OPPORTUNISTIC, DIRECT, PROPAGATED]
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DESTINATION_LENGTH = RNS.Identity.TRUNCATED_HASHLENGTH//8
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SIGNATURE_LENGTH = RNS.Identity.SIGLENGTH//8
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# LXMF overhead is 163 bytes per message:
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# 10 bytes for destination hash
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# 10 bytes for source hash
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# 128 bytes for RSA signature
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# 8 bytes for timestamp
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# 7 bytes for msgpack structure
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LXMF_OVERHEAD = 2*DESTINATION_LENGTH + SIGNATURE_LENGTH + 8 + 7
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# With an MTU of 500, the maximum RSA-encrypted
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# amount of data we can send in a single packet
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# is given by the below calculation; 258 bytes.
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RSA_PACKET_MDU = RNS.Packet.RSA_MDU
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# The max content length we can fit in LXMF message
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# inside a single RNS packet is the RSA MDU, minus
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# the LXMF overhead. We can optimise a bit though, by
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# inferring the destination hash from the destination
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# field of the packet, therefore we also add the length
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# of a destination hash to the calculation. With default
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# RNS and LXMF parameters, the largest single-packet
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# LXMF message we can send is 105 bytes. If a message
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# is larger than that, a Reticulum link will be used.
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RSA_PACKET_MAX_CONTENT = RSA_PACKET_MDU - LXMF_OVERHEAD + DESTINATION_LENGTH
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# Links can carry a significantly larger MDU, due to
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# more efficient elliptic curve cryptography. The link
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# MDU with default Reticulum parameters is 415 bytes.
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LINK_PACKET_MDU = RNS.Link.MDU
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# Which means that we can deliver single-packet LXMF
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# messages with content of up to 252 bytes over a link.
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# If a message is larger than that, LXMF will sequence
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# and transfer it as a RNS resource over the link instead.
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LINK_PACKET_MAX_CONTENT = LINK_PACKET_MDU - LXMF_OVERHEAD
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# For plain packets without encryption, we can
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# fit up to 324 bytes of content.
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PLAIN_PACKET_MDU = RNS.Packet.PLAIN_MDU
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PLAIN_PACKET_MAX_CONTENT = PLAIN_PACKET_MDU - LXMF_OVERHEAD + DESTINATION_LENGTH
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def __init__(self, destination, source, content = "", title = "", fields = None, desired_method = None, destination_hash = None, source_hash = None):
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if isinstance(destination, RNS.Destination) or destination == None:
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self.__destination = destination
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if destination != None:
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self.destination_hash = destination.hash
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else:
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self.destination_hash = destination_hash
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else:
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raise ValueError("LXMessage initialised with invalid destination")
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if isinstance(source, RNS.Destination) or source == None:
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self.__source = source
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if source != None:
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self.source_hash = source.hash
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else:
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self.source_hash = source_hash
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else:
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raise ValueError("LXMessage initialised with invalid source")
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self.set_title_from_string(title)
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self.set_content_from_string(content)
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self.set_fields(fields)
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self.payload = None
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self.timestamp = None
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self.signature = None
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self.hash = None
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self.packed = None
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self.progress = None
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self.state = LXMessage.DRAFT
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self.method = LXMessage.UNKNOWN
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self.representation = LXMessage.UNKNOWN
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self.desired_method = desired_method
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self.delivery_attempts = 0
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self.transport_encryption = None
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self.packet_representation = None
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self.resource_representation = None
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self.__delivery_destination = None
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def set_title_from_string(self, title_string):
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self.title = title_string.encode("utf-8")
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def set_title_from_bytes(self, title_bytes):
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self.title = title_bytes
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def title_as_string(self):
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return self.title.decode("utf-8")
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def set_content_from_string(self, content_string):
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self.content = content_string.encode("utf-8")
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def set_content_from_bytes(self, content_bytes):
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self.content = content_bytes
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def content_as_string(self):
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return self.content.decode("utf-8")
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def set_fields(self, fields):
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if isinstance(fields, dict) or fields == None:
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self.fields = fields
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else:
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raise ValueError("LXMessage property \"fields\" can only be dict or None")
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def get_fields(self):
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return self.__fields
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def set_destination(self, destination):
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if self.destination == None:
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if isinstance(destination, RNS.Destination):
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self.__destination = destination
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else:
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raise ValueError("Invalid destination set on LXMessage")
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else:
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raise ValueError("Cannot reassign destination on LXMessage")
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def get_destination(self):
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return self.__destination
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def set_source(self, source):
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if self.source == None:
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if isinstance(source, RNS.Destination):
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self.__source = source
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else:
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raise ValueError("Invalid source set on LXMessage")
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else:
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raise ValueError("Cannot reassign source on LXMessage")
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def get_source(self):
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return self.__source
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def set_delivery_destination(self, delivery_destination):
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self.__delivery_destination = delivery_destination
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def pack(self):
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self.timestamp = time.time()
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self.payload = [self.timestamp, self.title, self.content, self.fields]
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hashed_part = b""
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hashed_part += self.__destination.hash
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hashed_part += self.__source.hash
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hashed_part += msgpack.packb(self.timestamp)
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hashed_part += msgpack.packb(self.payload)
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self.hash = RNS.Identity.fullHash(hashed_part)
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signed_part = b""
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signed_part += hashed_part
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signed_part += self.hash
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self.signature = self.__source.sign(signed_part)
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self.packed = b""
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self.packed += self.__destination.hash
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self.packed += self.__source.hash
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self.packed += self.signature
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packed_payload = msgpack.packb(self.payload)
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self.packed += packed_payload
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self.packed_size = len(self.packed)
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content_size = len(packed_payload)
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# If no desired delivery method has been defined,
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# one will be chosen according to these rules:
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if self.desired_method == None:
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self.desired_method == LXMessage.DIRECT
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# TODO: Expand rules to something more intelligent
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if self.desired_method == LXMessage.OPPORTUNISTIC:
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if self.__destination.type == RNS.Destination.SINGLE:
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single_packet_content_limit = LXMessage.RSA_PACKET_MAX_CONTENT
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elif self.__destination.type == RNS.Destination.PLAIN:
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single_packet_content_limit = LXMessage.PLAIN_PACKET_MAX_CONTENT
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if content_size > single_packet_content_limit:
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raise TypeError("LXMessage desired opportunistic delivery method, but content exceeds single-packet size.")
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else:
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self.method = LXMessage.OPPORTUNISTIC
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self.representation = LXMessage.PACKET
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self.__delivery_destination = self.__destination
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elif self.desired_method == LXMessage.DIRECT or self.desired_method == LXMessage.PROPAGATED:
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single_packet_content_limit = LXMessage.LINK_PACKET_MAX_CONTENT
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if content_size <= single_packet_content_limit:
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self.method = self.desired_method
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self.representation = LXMessage.PACKET
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else:
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self.method = self.desired_method
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self.representation = LXMessage.RESOURCE
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def send(self):
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if self.method == LXMessage.OPPORTUNISTIC:
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self.__as_packet().send().delivery_callback(self.__mark_delivered)
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self.state = LXMessage.SENT
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elif self.method == LXMessage.DIRECT:
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self.state = LXMessage.SENDING
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self.resource_representation = self.__as_resource()
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elif self.method == LXMessage.PROPAGATED:
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pass
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def __mark_delivered(self, receipt = None):
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RNS.log("Received delivery notification for "+str(self), RNS.LOG_DEBUG)
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self.state = LXMessage.DELIVERED
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def __resource_concluded(self, resource):
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if resource.status == RNS.Resource.COMPLETE:
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self.__mark_delivered()
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else:
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resource.link.teardown()
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self.state = LXMessage.OUTBOUND
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def __update_transfer_progress(self, resource):
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self.progress = resource.progress()
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def __as_packet(self):
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if not self.packed:
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self.pack()
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if not self.__delivery_destination:
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raise ValueError("Can't synthesize packet for LXMF message before delivery destination is known")
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if self.method == LXMessage.OPPORTUNISTIC:
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return RNS.Packet(self.__delivery_destination, self.packed[LXMessage.DESTINATION_LENGTH:])
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elif self.method == LXMessage.DIRECT or self.method == LXMessage.PROPAGATED:
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return RNS.Packet(self.__delivery_destination, self.packed)
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def __as_resource(self):
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if not self.packed:
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self.pack()
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if not self.__delivery_destination:
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raise ValueError("Can't synthesize resource for LXMF message before delivery destination is known")
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if not self.__delivery_destination.type == RNS.Destination.LINK:
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raise TypeError("Tried to synthesize resource for LXMF message on a delivery destination that was not a link")
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if not self.__delivery_destination.status == RNS.Link.ACTIVE:
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raise ConnectionError("Tried to synthesize resource for LXMF message on a link that was not active")
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self.progress = 0.0
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return RNS.Resource(self.packed, self.__delivery_destination, callback = self.__resource_concluded, progress_callback = self.__update_transfer_progress)
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@staticmethod
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def unpack_from_bytes(lxmf_bytes):
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destination_hash = lxmf_bytes[:LXMessage.DESTINATION_LENGTH]
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source_hash = lxmf_bytes[LXMessage.DESTINATION_LENGTH:2*LXMessage.DESTINATION_LENGTH]
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signature = lxmf_bytes[2*LXMessage.DESTINATION_LENGTH:2*LXMessage.DESTINATION_LENGTH+LXMessage.SIGNATURE_LENGTH]
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packed_payload = lxmf_bytes[2*LXMessage.DESTINATION_LENGTH+LXMessage.SIGNATURE_LENGTH:]
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unpacked_payload = msgpack.unpackb(packed_payload)
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destination = RNS.Identity.recall(destination_hash)
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source = RNS.Identity.recall(source_hash)
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timestamp = unpacked_payload[0]
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title_bytes = unpacked_payload[1]
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content_bytes = unpacked_payload[2]
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fields = unpacked_payload[3]
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message = LXMessage(
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destination = destination,
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source = source,
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content = "",
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title = "",
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fields = fields,
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destination_hash = destination_hash,
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source_hash = source_hash)
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message.set_title_from_bytes(title_bytes)
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message.set_content_from_bytes(content_bytes)
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message.timestamp = timestamp
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return message
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@staticmethod
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def unpack_from_file(lxmf_file_handle):
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pass
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class LXMRouter:
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MAX_DELIVERY_ATTEMPTS = 3
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PROCESSING_INTERVAL = 5
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DELIVERY_RETRY_WAIT = 15
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def __init__(self):
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self.pending_inbound = []
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self.pending_outbound = []
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self.failed_outbound = []
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self.direct_links = {}
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self.delivery_destinations = {}
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self.processing_outbound = False
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self.processing_inbound = False
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self.identity = RNS.Identity()
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self.lxmf_query_destination = RNS.Destination(None, RNS.Destination.IN, RNS.Destination.PLAIN, APP_NAME, "query")
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self.propagation_destination = RNS.Destination(self.identity, RNS.Destination.IN, RNS.Destination.SINGLE, APP_NAME, "propagation")
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self.__delivery_callback = None
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job_thread = threading.Thread(target=self.jobloop)
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job_thread.setDaemon(True)
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job_thread.start()
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def register_delivery_identity(self, identity, display_name = None):
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delivery_destination = RNS.Destination(identity, RNS.Destination.IN, RNS.Destination.SINGLE, "lxmf", "delivery")
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delivery_destination.packet_callback(self.delivery_packet)
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delivery_destination.link_established_callback(self.delivery_link_established)
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delivery_destination.display_name = display_name
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self.delivery_destinations[delivery_destination.hash] = delivery_destination
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return delivery_destination
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def register_delivery_callback(self, callback):
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self.__delivery_callback = callback
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def handle_outbound(self, lxmessage):
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RNS.log("LXM Router received outbound message: "+str(lxmessage))
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while self.processing_outbound:
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time.sleep(0.1)
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if not lxmessage.packed:
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lxmessage.pack()
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self.pending_outbound.append(lxmessage)
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self.process_outbound()
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def lxmf_delivery(self, lxmf_data, destination_type = None):
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try:
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message = LXMessage.unpack_from_bytes(lxmf_data)
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except Exception as e:
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RNS.log("Could not assemble LXMF message from received data", RNS.LOG_NOTICE)
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RNS.log("The contained exception was: "+str(e), RNS.LOG_DEBUG)
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if RNS.Reticulum.should_allow_unencrypted():
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message.transport_encryption = "Consider unencrypted (Disabling encryption was allowed in Reticulum configuration)"
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else:
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if destination_type == RNS.Destination.SINGLE:
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message.transport_encryption = "RSA-"+str(RNS.Identity.KEYSIZE)
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elif destination_type == RNS.Destination.GROUP:
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message.transport_encryption = "AES-128"
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elif destination_type == RNS.Destination.LINK:
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message.transport_encryption = "EC-SECP256R1"
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else:
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message.transport_encryption = None
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if self.__delivery_callback != None:
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self.__delivery_callback(message)
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return True
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def delivery_packet(self, data, packet):
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try:
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if packet.destination.type != RNS.Destination.LINK:
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lxmf_data = b""
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lxmf_data += packet.destination.hash
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lxmf_data += data
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else:
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lxmf_data = data
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if self.lxmf_delivery(lxmf_data, packet.destination.type):
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packet.prove()
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except Exception as e:
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RNS.log("Exception occurred while parsing incoming LXMF data.", RNS.LOG_ERROR)
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RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
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def delivery_link_established(self, link):
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link.packet_callback(self.delivery_packet)
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link.set_resource_strategy(RNS.Link.ACCEPT_ALL)
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link.resource_started_callback(self.resource_transfer_began)
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link.resource_concluded_callback(self.resource_transfer_concluded)
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def delivery_link_closed(self, link):
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pass
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def resource_transfer_began(self, resource):
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RNS.log("Transfer began for resource "+str(resource), RNS.LOG_DEBUG)
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def resource_transfer_concluded(self, resource):
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RNS.log("Transfer concluded for resource "+str(resource), RNS.LOG_DEBUG)
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if resource.status == RNS.Resource.COMPLETE:
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self.lxmf_delivery(resource.data, resource.link.type)
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def jobloop(self):
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while (True):
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# TODO: Improve this to scheduling, so manual
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# triggers can delay next run
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self.jobs()
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time.sleep(LXMRouter.PROCESSING_INTERVAL)
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def jobs(self):
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self.process_outbound()
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def process_outbound(self, sender = None):
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if self.processing_outbound:
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return
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for lxmessage in self.pending_outbound:
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if lxmessage.state == LXMessage.DELIVERED:
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RNS.log("Delivery has occurred for "+str(lxmessage)+", removing from outbound queue", RNS.LOG_DEBUG)
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self.pending_outbound.remove(lxmessage)
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else:
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RNS.log("Starting outbound processing for "+str(lxmessage)+" to "+RNS.prettyhexrep(lxmessage.get_destination().hash), RNS.LOG_DEBUG)
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# Outbound handling for opportunistic messages
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if lxmessage.method == LXMessage.OPPORTUNISTIC:
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if lxmessage.delivery_attempts < LXMRouter.MAX_DELIVERY_ATTEMPTS:
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if not hasattr(lxmessage, "next_delivery_attempt") or time.time() > lxmessage.next_delivery_attempt:
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lxmessage.delivery_attempts += 1
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lxmessage.next_delivery_attempt = time.time() + LXMRouter.DELIVERY_RETRY_WAIT
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RNS.log("Opportunistic delivery attempt "+str(lxmessage.delivery_attempts)+" for "+str(lxmessage)+" to "+RNS.prettyhexrep(lxmessage.get_destination().hash), RNS.LOG_DEBUG)
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lxmessage.send()
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else:
|
||||
RNS.log("Max delivery attempts reached for "+str(lxmessage)+" to "+RNS.prettyhexrep(lxmessage.get_destination().hash), RNS.LOG_DEBUG)
|
||||
self.pending_outbound.remove(lxmessage)
|
||||
self.failed_outbound.append(lxmessage)
|
||||
|
||||
# Outbound handling for messages transferred
|
||||
# over a direct link to the final recipient
|
||||
elif lxmessage.method == LXMessage.DIRECT:
|
||||
if lxmessage.delivery_attempts < LXMRouter.MAX_DELIVERY_ATTEMPTS:
|
||||
delivery_destination_hash = lxmessage.get_destination().hash
|
||||
|
||||
if delivery_destination_hash in self.direct_links:
|
||||
# A link already exists, so we'll try to use it
|
||||
# to deliver the message
|
||||
direct_link = self.direct_links[delivery_destination_hash]
|
||||
if direct_link.status == RNS.Link.ACTIVE:
|
||||
if lxmessage.state != LXMessage.SENDING:
|
||||
RNS.log("Starting transfer of "+str(lxmessage)+" to "+RNS.prettyhexrep(lxmessage.get_destination().hash), RNS.LOG_DEBUG)
|
||||
lxmessage.set_delivery_destination(direct_link)
|
||||
lxmessage.send()
|
||||
else:
|
||||
RNS.log("The transfer of "+str(lxmessage)+" is in progress ("+str(round(lxmessage.progress*100, 1))+"%)", RNS.LOG_DEBUG)
|
||||
elif direct_link.status == RNS.Link.CLOSED:
|
||||
RNS.log("The link to "+RNS.prettyhexrep(lxmessage.get_destination().hash)+" was closed", RNS.LOG_DEBUG)
|
||||
lxmessage.set_delivery_destination(None)
|
||||
self.direct_links.pop(delivery_destination_hash)
|
||||
lxmessage.next_delivery_attempt = time.time() + LXMRouter.DELIVERY_RETRY_WAIT
|
||||
else:
|
||||
# Simply wait for the link to become
|
||||
# active or close
|
||||
RNS.log("The link to "+RNS.prettyhexrep(lxmessage.get_destination().hash)+" is pending, waiting for link to become active", RNS.LOG_DEBUG)
|
||||
else:
|
||||
# No link exists, so we'll try to establish one, but
|
||||
# only if we've never tried before, or the retry wait
|
||||
# period has elapsed.
|
||||
if not hasattr(lxmessage, "next_delivery_attempt") or time.time() > lxmessage.next_delivery_attempt:
|
||||
lxmessage.delivery_attempts += 1
|
||||
lxmessage.next_delivery_attempt = time.time() + LXMRouter.DELIVERY_RETRY_WAIT
|
||||
if lxmessage.delivery_attempts < LXMRouter.MAX_DELIVERY_ATTEMPTS:
|
||||
RNS.log("Establishing link to "+RNS.prettyhexrep(lxmessage.get_destination().hash)+" for delivery attempt "+str(lxmessage.delivery_attempts)+" to "+RNS.prettyhexrep(lxmessage.get_destination().hash), RNS.LOG_DEBUG)
|
||||
delivery_link = RNS.Link(lxmessage.get_destination())
|
||||
delivery_link.link_established_callback(self.process_outbound)
|
||||
self.direct_links[delivery_destination_hash] = delivery_link
|
||||
else:
|
||||
RNS.log("Max delivery attempts reached for "+str(lxmessage)+" to "+RNS.prettyhexrep(lxmessage.get_destination().hash), RNS.LOG_DEBUG)
|
||||
self.pending_outbound.remove(lxmessage)
|
||||
self.failed_outbound.append(lxmessage)
|
||||
|
||||
# Outbound handling for messages transported via
|
||||
# propagation to a LXMF router network.
|
||||
elif lxmessage.method == LXMessage.PROPAGATED:
|
||||
RNS.log("Attempting propagated delivery for "+str(lxmessage)+" to "+RNS.prettyhexrep(lxmessage.get_destination().hash), RNS.LOG_DEBUG)
|
||||
raise NotImplementedError("LXMF propagation is not implemented yet")
|
||||
Loading…
Reference in New Issue
Block a user