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Reticulum/RNS/Resource.py

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# MIT License
#
# Copyright (c) 2016-2023 Mark Qvist / unsigned.io and contributors.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import RNS
import os
import bz2
import math
import time
import tempfile
import threading
from threading import Lock
from .vendor import umsgpack as umsgpack
from time import sleep
class Resource:
"""
The Resource class allows transferring arbitrary amounts
of data over a link. It will automatically handle sequencing,
compression, coordination and checksumming.
:param data: The data to be transferred. Can be *bytes* or an open *file handle*. See the :ref:`Filetransfer Example<example-filetransfer>` for details.
:param link: The :ref:`RNS.Link<api-link>` instance on which to transfer the data.
:param advertise: Optional. Whether to automatically advertise the resource. Can be *True* or *False*.
:param auto_compress: Optional. Whether to auto-compress the resource. Can be *True* or *False*.
:param callback: An optional *callable* with the signature *callback(resource)*. Will be called when the resource transfer concludes.
:param progress_callback: An optional *callable* with the signature *callback(resource)*. Will be called whenever the resource transfer progress is updated.
"""
# The initial window size at beginning of transfer
WINDOW = 4
# Absolute minimum window size during transfer
WINDOW_MIN = 2
# The maximum window size for transfers on slow links
WINDOW_MAX_SLOW = 10
# The maximum window size for transfers on very slow links
WINDOW_MAX_VERY_SLOW = 4
# The maximum window size for transfers on fast links
WINDOW_MAX_FAST = 75
# For calculating maps and guard segments, this
# must be set to the global maximum window.
WINDOW_MAX = WINDOW_MAX_FAST
# If the fast rate is sustained for this many request
# rounds, the fast link window size will be allowed.
FAST_RATE_THRESHOLD = WINDOW_MAX_SLOW - WINDOW - 2
# If the very slow rate is sustained for this many request
# rounds, window will be capped to the very slow limit.
VERY_SLOW_RATE_THRESHOLD = 2
# If the RTT rate is higher than this value,
# the max window size for fast links will be used.
# The default is 50 Kbps (the value is stored in
# bytes per second, hence the "/ 8").
RATE_FAST = (50*1000) / 8
# If the RTT rate is lower than this value,
# the window size will be capped at .
# The default is 50 Kbps (the value is stored in
# bytes per second, hence the "/ 8").
RATE_VERY_SLOW = (2*1000) / 8
# The minimum allowed flexibility of the window size.
# The difference between window_max and window_min
# will never be smaller than this value.
WINDOW_FLEXIBILITY = 4
# Number of bytes in a map hash
MAPHASH_LEN = 4
SDU = RNS.Packet.MDU
RANDOM_HASH_SIZE = 4
# This is an indication of what the
# maximum size a resource should be, if
# it is to be handled within reasonable
# time constraint, even on small systems.
#
# A small system in this regard is
# defined as a Raspberry Pi, which should
# be able to compress, encrypt and hash-map
# the resource in about 10 seconds.
#
# This constant will be used when determining
# how to sequence the sending of large resources.
#
# Capped at 16777215 (0xFFFFFF) per segment to
# fit in 3 bytes in resource advertisements.
MAX_EFFICIENT_SIZE = 16 * 1024 * 1024 - 1
RESPONSE_MAX_GRACE_TIME = 10
# The maximum size to auto-compress with
# bz2 before sending.
AUTO_COMPRESS_MAX_SIZE = MAX_EFFICIENT_SIZE
PART_TIMEOUT_FACTOR = 4
PART_TIMEOUT_FACTOR_AFTER_RTT = 2
PROOF_TIMEOUT_FACTOR = 3
MAX_RETRIES = 16
MAX_ADV_RETRIES = 4
SENDER_GRACE_TIME = 10.0
PROCESSING_GRACE = 1.0
RETRY_GRACE_TIME = 0.25
PER_RETRY_DELAY = 0.5
WATCHDOG_MAX_SLEEP = 1
HASHMAP_IS_NOT_EXHAUSTED = 0x00
HASHMAP_IS_EXHAUSTED = 0xFF
# Status constants
NONE = 0x00
QUEUED = 0x01
ADVERTISED = 0x02
TRANSFERRING = 0x03
AWAITING_PROOF = 0x04
ASSEMBLING = 0x05
COMPLETE = 0x06
FAILED = 0x07
CORRUPT = 0x08
@staticmethod
def accept(advertisement_packet, callback=None, progress_callback = None, request_id = None):
try:
adv = ResourceAdvertisement.unpack(advertisement_packet.plaintext)
resource = Resource(None, advertisement_packet.link, request_id = request_id)
resource.status = Resource.TRANSFERRING
resource.flags = adv.f
resource.size = adv.t
resource.total_size = adv.d
resource.uncompressed_size = adv.d
resource.hash = adv.h
resource.original_hash = adv.o
resource.random_hash = adv.r
resource.hashmap_raw = adv.m
resource.encrypted = True if resource.flags & 0x01 else False
resource.compressed = True if resource.flags >> 1 & 0x01 else False
resource.initiator = False
resource.callback = callback
resource.__progress_callback = progress_callback
resource.total_parts = int(math.ceil(resource.size/float(Resource.SDU)))
resource.received_count = 0
resource.outstanding_parts = 0
resource.parts = [None] * resource.total_parts
resource.window = Resource.WINDOW
resource.window_max = Resource.WINDOW_MAX_SLOW
resource.window_min = Resource.WINDOW_MIN
resource.window_flexibility = Resource.WINDOW_FLEXIBILITY
resource.last_activity = time.time()
resource.storagepath = RNS.Reticulum.resourcepath+"/"+resource.original_hash.hex()
resource.segment_index = adv.i
resource.total_segments = adv.l
if adv.l > 1:
resource.split = True
else:
resource.split = False
resource.hashmap = [None] * resource.total_parts
resource.hashmap_height = 0
resource.waiting_for_hmu = False
resource.receiving_part = False
resource.consecutive_completed_height = -1
if not resource.link.has_incoming_resource(resource):
resource.link.register_incoming_resource(resource)
RNS.log(f"Accepting resource advertisement for {RNS.prettyhexrep(resource.hash)}. Transfer size is {RNS.prettysize(resource.size)} in {resource.total_parts} parts.", RNS.LOG_DEBUG)
if resource.link.callbacks.resource_started != None:
try:
resource.link.callbacks.resource_started(resource)
except Exception as e:
RNS.log("Error while executing resource started callback from "+str(resource)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
resource.hashmap_update(0, resource.hashmap_raw)
resource.watchdog_job()
return resource
else:
RNS.log("Ignoring resource advertisement for "+RNS.prettyhexrep(resource.hash)+", resource already transferring", RNS.LOG_DEBUG)
return None
except Exception as e:
RNS.log("Could not decode resource advertisement, dropping resource", RNS.LOG_DEBUG)
return None
# Create a resource for transmission to a remote destination
# The data passed can be either a bytes-array or a file opened
# in binary read mode.
def __init__(self, data, link, advertise=True, auto_compress=True, callback=None, progress_callback=None, timeout = None, segment_index = 1, original_hash = None, request_id = None, is_response = False):
data_size = None
resource_data = None
self.assembly_lock = False
self.preparing_next_segment = False
self.next_segment = None
if data != None:
if not hasattr(data, "read") and len(data) > Resource.MAX_EFFICIENT_SIZE:
original_data = data
data_size = len(original_data)
data = tempfile.TemporaryFile()
data.write(original_data)
del original_data
if hasattr(data, "read"):
if data_size == None:
data_size = os.stat(data.name).st_size
self.total_size = data_size
if data_size <= Resource.MAX_EFFICIENT_SIZE:
self.total_segments = 1
self.segment_index = 1
self.split = False
resource_data = data.read()
data.close()
else:
self.total_segments = ((data_size-1)//Resource.MAX_EFFICIENT_SIZE)+1
self.segment_index = segment_index
self.split = True
seek_index = segment_index-1
seek_position = seek_index*Resource.MAX_EFFICIENT_SIZE
data.seek(seek_position)
resource_data = data.read(Resource.MAX_EFFICIENT_SIZE)
self.input_file = data
elif isinstance(data, bytes):
data_size = len(data)
self.total_size = data_size
resource_data = data
self.total_segments = 1
self.segment_index = 1
self.split = False
elif data == None:
pass
else:
raise TypeError("Invalid data instance type passed to resource initialisation")
data = resource_data
self.status = Resource.NONE
self.link = link
self.max_retries = Resource.MAX_RETRIES
self.max_adv_retries = Resource.MAX_ADV_RETRIES
self.retries_left = self.max_retries
self.timeout_factor = self.link.traffic_timeout_factor
self.part_timeout_factor = Resource.PART_TIMEOUT_FACTOR
self.sender_grace_time = Resource.SENDER_GRACE_TIME
self.hmu_retry_ok = False
self.watchdog_lock = False
self.__watchdog_job_id = 0
self.__progress_callback = progress_callback
self.rtt = None
self.rtt_rxd_bytes = 0
self.req_sent = 0
self.req_resp_rtt_rate = 0
self.rtt_rxd_bytes_at_part_req = 0
self.fast_rate_rounds = 0
self.very_slow_rate_rounds = 0
self.request_id = request_id
self.is_response = is_response
self.req_hashlist = []
self.receiver_min_consecutive_height = 0
if timeout != None:
self.timeout = timeout
else:
self.timeout = self.link.rtt * self.link.traffic_timeout_factor
if data != None:
self.initiator = True
self.callback = callback
self.uncompressed_data = data
compression_began = time.time()
if (auto_compress and len(self.uncompressed_data) <= Resource.AUTO_COMPRESS_MAX_SIZE):
RNS.log("Compressing resource data...", RNS.LOG_DEBUG)
self.compressed_data = bz2.compress(self.uncompressed_data)
RNS.log("Compression completed in "+str(round(time.time()-compression_began, 3))+" seconds", RNS.LOG_DEBUG)
else:
self.compressed_data = self.uncompressed_data
self.uncompressed_size = len(self.uncompressed_data)
self.compressed_size = len(self.compressed_data)
if (self.compressed_size < self.uncompressed_size and auto_compress):
saved_bytes = len(self.uncompressed_data) - len(self.compressed_data)
RNS.log("Compression saved "+str(saved_bytes)+" bytes, sending compressed", RNS.LOG_DEBUG)
self.data = b""
self.data += RNS.Identity.get_random_hash()[:Resource.RANDOM_HASH_SIZE]
self.data += self.compressed_data
self.compressed = True
self.uncompressed_data = None
else:
self.data = b""
self.data += RNS.Identity.get_random_hash()[:Resource.RANDOM_HASH_SIZE]
self.data += self.uncompressed_data
self.uncompressed_data = self.data
self.compressed = False
self.compressed_data = None
if auto_compress:
RNS.log("Compression did not decrease size, sending uncompressed", RNS.LOG_DEBUG)
# Resources handle encryption directly to
# make optimal use of packet MTU on an entire
# encrypted stream. The Resource instance will
# use it's underlying link directly to encrypt.
self.data = self.link.encrypt(self.data)
self.encrypted = True
self.size = len(self.data)
self.sent_parts = 0
hashmap_entries = int(math.ceil(self.size/float(Resource.SDU)))
self.total_parts = hashmap_entries
hashmap_ok = False
while not hashmap_ok:
hashmap_computation_began = time.time()
RNS.log("Starting resource hashmap computation with "+str(hashmap_entries)+" entries...", RNS.LOG_DEBUG)
self.random_hash = RNS.Identity.get_random_hash()[:Resource.RANDOM_HASH_SIZE]
self.hash = RNS.Identity.full_hash(data+self.random_hash)
self.truncated_hash = RNS.Identity.truncated_hash(data+self.random_hash)
self.expected_proof = RNS.Identity.full_hash(data+self.hash)
if original_hash == None:
self.original_hash = self.hash
else:
self.original_hash = original_hash
self.parts = []
self.hashmap = b""
collision_guard_list = []
for i in range(0,hashmap_entries):
data = self.data[i*Resource.SDU:(i+1)*Resource.SDU]
map_hash = self.get_map_hash(data)
if map_hash in collision_guard_list:
RNS.log("Found hash collision in resource map, remapping...", RNS.LOG_VERBOSE)
hashmap_ok = False
break
else:
hashmap_ok = True
collision_guard_list.append(map_hash)
if len(collision_guard_list) > ResourceAdvertisement.COLLISION_GUARD_SIZE:
collision_guard_list.pop(0)
part = RNS.Packet(link, data, context=RNS.Packet.RESOURCE)
part.pack()
part.map_hash = map_hash
self.hashmap += part.map_hash
self.parts.append(part)
RNS.log("Hashmap computation concluded in "+str(round(time.time()-hashmap_computation_began, 3))+" seconds", RNS.LOG_DEBUG)
if advertise:
self.advertise()
else:
self.receive_lock = Lock()
def hashmap_update_packet(self, plaintext):
if not self.status == Resource.FAILED:
self.last_activity = time.time()
self.retries_left = self.max_retries
update = umsgpack.unpackb(plaintext[RNS.Identity.HASHLENGTH//8:])
self.hashmap_update(update[0], update[1])
def hashmap_update(self, segment, hashmap):
if not self.status == Resource.FAILED:
self.status = Resource.TRANSFERRING
seg_len = ResourceAdvertisement.HASHMAP_MAX_LEN
hashes = len(hashmap)//Resource.MAPHASH_LEN
for i in range(0,hashes):
if self.hashmap[i+segment*seg_len] == None:
self.hashmap_height += 1
self.hashmap[i+segment*seg_len] = hashmap[i*Resource.MAPHASH_LEN:(i+1)*Resource.MAPHASH_LEN]
self.waiting_for_hmu = False
self.request_next()
def get_map_hash(self, data):
return RNS.Identity.full_hash(data+self.random_hash)[:Resource.MAPHASH_LEN]
def advertise(self):
"""
Advertise the resource. If the other end of the link accepts
the resource advertisement it will begin transferring.
"""
thread = threading.Thread(target=self.__advertise_job, daemon=True)
thread.start()
if self.segment_index < self.total_segments:
prepare_thread = threading.Thread(target=self.__prepare_next_segment, daemon=True)
prepare_thread.start()
def __advertise_job(self):
self.advertisement_packet = RNS.Packet(self.link, ResourceAdvertisement(self).pack(), context=RNS.Packet.RESOURCE_ADV)
while not self.link.ready_for_new_resource():
self.status = Resource.QUEUED
sleep(0.25)
try:
self.advertisement_packet.send()
self.last_activity = time.time()
self.adv_sent = self.last_activity
self.rtt = None
self.status = Resource.ADVERTISED
self.retries_left = self.max_adv_retries
self.link.register_outgoing_resource(self)
RNS.log("Sent resource advertisement for "+RNS.prettyhexrep(self.hash), RNS.LOG_DEBUG)
except Exception as e:
RNS.log("Could not advertise resource, the contained exception was: "+str(e), RNS.LOG_ERROR)
self.cancel()
return
self.watchdog_job()
def watchdog_job(self):
thread = threading.Thread(target=self.__watchdog_job)
thread.daemon = True
thread.start()
def __watchdog_job(self):
self.__watchdog_job_id += 1
this_job_id = self.__watchdog_job_id
while self.status < Resource.ASSEMBLING and this_job_id == self.__watchdog_job_id:
while self.watchdog_lock:
sleep(0.025)
sleep_time = None
if self.status == Resource.ADVERTISED:
sleep_time = (self.adv_sent+self.timeout+Resource.PROCESSING_GRACE)-time.time()
if sleep_time < 0:
if self.retries_left <= 0:
RNS.log("Resource transfer timeout after sending advertisement", RNS.LOG_DEBUG)
self.cancel()
sleep_time = 0.001
else:
try:
RNS.log("No part requests received, retrying resource advertisement...", RNS.LOG_DEBUG)
self.retries_left -= 1
self.advertisement_packet = RNS.Packet(self.link, ResourceAdvertisement(self).pack(), context=RNS.Packet.RESOURCE_ADV)
self.advertisement_packet.send()
self.last_activity = time.time()
self.adv_sent = self.last_activity
sleep_time = 0.001
except Exception as e:
RNS.log("Could not resend advertisement packet, cancelling resource. The contained exception was: "+str(e), RNS.LOG_VERBOSE)
self.cancel()
elif self.status == Resource.TRANSFERRING:
if not self.initiator:
if self.rtt == None:
rtt = self.link.rtt
else:
rtt = self.rtt
window_remaining = self.outstanding_parts
retries_used = self.max_retries - self.retries_left
extra_wait = retries_used * Resource.PER_RETRY_DELAY
sleep_time = self.last_activity + (rtt*(self.part_timeout_factor+window_remaining)) + Resource.RETRY_GRACE_TIME + extra_wait - time.time()
if sleep_time < 0:
if self.retries_left > 0:
ms = "" if self.outstanding_parts == 1 else "s"
RNS.log("Timed out waiting for "+str(self.outstanding_parts)+" part"+ms+", requesting retry", RNS.LOG_DEBUG)
if self.window > self.window_min:
self.window -= 1
if self.window_max > self.window_min:
self.window_max -= 1
if (self.window_max - self.window) > (self.window_flexibility-1):
self.window_max -= 1
sleep_time = 0.001
self.retries_left -= 1
self.waiting_for_hmu = False
self.request_next()
else:
self.cancel()
sleep_time = 0.001
else:
max_extra_wait = sum([(r+1) * Resource.PER_RETRY_DELAY for r in range(self.MAX_RETRIES)])
max_wait = self.rtt * self.timeout_factor * self.max_retries + self.sender_grace_time + max_extra_wait
sleep_time = self.last_activity + max_wait - time.time()
if sleep_time < 0:
RNS.log("Resource timed out waiting for part requests", RNS.LOG_DEBUG)
self.cancel()
sleep_time = 0.001
elif self.status == Resource.AWAITING_PROOF:
# Decrease timeout factor since proof packets are
# significantly smaller than full req/resp roundtrip
self.timeout_factor = Resource.PROOF_TIMEOUT_FACTOR
sleep_time = self.last_part_sent + (self.rtt*self.timeout_factor+self.sender_grace_time) - time.time()
if sleep_time < 0:
if self.retries_left <= 0:
RNS.log("Resource timed out waiting for proof", RNS.LOG_DEBUG)
self.cancel()
sleep_time = 0.001
else:
RNS.log("All parts sent, but no resource proof received, querying network cache...", RNS.LOG_DEBUG)
self.retries_left -= 1
expected_data = self.hash + self.expected_proof
expected_proof_packet = RNS.Packet(self.link, expected_data, packet_type=RNS.Packet.PROOF, context=RNS.Packet.RESOURCE_PRF)
expected_proof_packet.pack()
RNS.Transport.cache_request(expected_proof_packet.packet_hash, self.link)
self.last_part_sent = time.time()
sleep_time = 0.001
if sleep_time == 0:
RNS.log("Warning! Link watchdog sleep time of 0!", RNS.LOG_WARNING)
if sleep_time == None or sleep_time < 0:
RNS.log("Timing error, cancelling resource transfer.", RNS.LOG_ERROR)
self.cancel()
if sleep_time != None:
sleep(min(sleep_time, Resource.WATCHDOG_MAX_SLEEP))
def assemble(self):
if not self.status == Resource.FAILED:
try:
self.status = Resource.ASSEMBLING
stream = b"".join(self.parts)
if self.encrypted:
data = self.link.decrypt(stream)
else:
data = stream
# Strip off random hash
data = data[Resource.RANDOM_HASH_SIZE:]
if self.compressed:
self.data = bz2.decompress(data)
else:
self.data = data
calculated_hash = RNS.Identity.full_hash(self.data+self.random_hash)
if calculated_hash == self.hash:
self.file = open(self.storagepath, "ab")
self.file.write(self.data)
self.file.close()
self.status = Resource.COMPLETE
self.prove()
else:
self.status = Resource.CORRUPT
except Exception as e:
RNS.log("Error while assembling received resource.", RNS.LOG_ERROR)
RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
self.status = Resource.CORRUPT
self.link.resource_concluded(self)
if self.segment_index == self.total_segments:
if self.callback != None:
self.data = open(self.storagepath, "rb")
try:
self.callback(self)
except Exception as e:
RNS.log("Error while executing resource assembled callback from "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
try:
if hasattr(self.data, "close") and callable(self.data.close):
self.data.close()
os.unlink(self.storagepath)
except Exception as e:
RNS.log("Error while cleaning up resource files, the contained exception was:", RNS.LOG_ERROR)
RNS.log(str(e))
else:
RNS.log("Resource segment "+str(self.segment_index)+" of "+str(self.total_segments)+" received, waiting for next segment to be announced", RNS.LOG_DEBUG)
def prove(self):
if not self.status == Resource.FAILED:
try:
proof = RNS.Identity.full_hash(self.data+self.hash)
proof_data = self.hash+proof
proof_packet = RNS.Packet(self.link, proof_data, packet_type=RNS.Packet.PROOF, context=RNS.Packet.RESOURCE_PRF)
proof_packet.send()
RNS.Transport.cache(proof_packet, force_cache=True)
except Exception as e:
RNS.log("Could not send proof packet, cancelling resource", RNS.LOG_DEBUG)
RNS.log("The contained exception was: "+str(e), RNS.LOG_DEBUG)
self.cancel()
def __prepare_next_segment(self):
# Prepare the next segment for advertisement
RNS.log(f"Preparing segment {self.segment_index+1} of {self.total_segments} for resource {self}", RNS.LOG_DEBUG)
self.preparing_next_segment = True
self.next_segment = Resource(
self.input_file, self.link,
callback = self.callback,
segment_index = self.segment_index+1,
original_hash=self.original_hash,
progress_callback = self.__progress_callback,
request_id = self.request_id,
is_response = self.is_response,
advertise = False,
)
def validate_proof(self, proof_data):
if not self.status == Resource.FAILED:
if len(proof_data) == RNS.Identity.HASHLENGTH//8*2:
if proof_data[RNS.Identity.HASHLENGTH//8:] == self.expected_proof:
self.status = Resource.COMPLETE
self.link.resource_concluded(self)
if self.segment_index == self.total_segments:
# If all segments were processed, we'll
# signal that the resource sending concluded
if self.callback != None:
try:
self.callback(self)
except Exception as e:
RNS.log("Error while executing resource concluded callback from "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
finally:
try:
if hasattr(self, "input_file"):
if hasattr(self.input_file, "close") and callable(self.input_file.close):
self.input_file.close()
except Exception as e:
RNS.log("Error while closing resource input file: "+str(e), RNS.LOG_ERROR)
else:
# Otherwise we'll recursively create the
# next segment of the resource
if not self.preparing_next_segment:
RNS.log(f"Next segment preparation for resource {self} was not started yet, manually preparing now. This will cause transfer slowdown.", RNS.LOG_WARNING)
self.__prepare_next_segment()
while self.next_segment == None:
time.sleep(0.05)
self.next_segment.advertise()
else:
pass
else:
pass
def receive_part(self, packet):
with self.receive_lock:
self.receiving_part = True
self.last_activity = time.time()
self.retries_left = self.max_retries
if self.req_resp == None:
self.req_resp = self.last_activity
rtt = self.req_resp-self.req_sent
self.part_timeout_factor = Resource.PART_TIMEOUT_FACTOR_AFTER_RTT
if self.rtt == None:
self.rtt = self.link.rtt
self.watchdog_job()
elif rtt < self.rtt:
self.rtt = max(self.rtt - self.rtt*0.05, rtt)
elif rtt > self.rtt:
self.rtt = min(self.rtt + self.rtt*0.05, rtt)
if rtt > 0:
req_resp_cost = len(packet.raw)+self.req_sent_bytes
self.req_resp_rtt_rate = req_resp_cost / rtt
if self.req_resp_rtt_rate > Resource.RATE_FAST and self.fast_rate_rounds < Resource.FAST_RATE_THRESHOLD:
self.fast_rate_rounds += 1
if self.fast_rate_rounds == Resource.FAST_RATE_THRESHOLD:
self.window_max = Resource.WINDOW_MAX_FAST
if not self.status == Resource.FAILED:
self.status = Resource.TRANSFERRING
part_data = packet.data
part_hash = self.get_map_hash(part_data)
consecutive_index = self.consecutive_completed_height if self.consecutive_completed_height >= 0 else 0
i = consecutive_index
for map_hash in self.hashmap[consecutive_index:consecutive_index+self.window]:
if map_hash == part_hash:
if self.parts[i] == None:
# Insert data into parts list
self.parts[i] = part_data
self.rtt_rxd_bytes += len(part_data)
self.received_count += 1
self.outstanding_parts -= 1
# Update consecutive completed pointer
if i == self.consecutive_completed_height + 1:
self.consecutive_completed_height = i
cp = self.consecutive_completed_height + 1
while cp < len(self.parts) and self.parts[cp] != None:
self.consecutive_completed_height = cp
cp += 1
if self.__progress_callback != None:
try:
self.__progress_callback(self)
except Exception as e:
RNS.log("Error while executing progress callback from "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
i += 1
self.receiving_part = False
if self.received_count == self.total_parts and not self.assembly_lock:
self.assembly_lock = True
self.assemble()
elif self.outstanding_parts == 0:
# TODO: Figure out if there is a mathematically
# optimal way to adjust windows
if self.window < self.window_max:
self.window += 1
if (self.window - self.window_min) > (self.window_flexibility-1):
self.window_min += 1
if self.req_sent != 0:
rtt = time.time()-self.req_sent
req_transferred = self.rtt_rxd_bytes - self.rtt_rxd_bytes_at_part_req
if rtt != 0:
self.req_data_rtt_rate = req_transferred/rtt
self.rtt_rxd_bytes_at_part_req = self.rtt_rxd_bytes
if self.req_data_rtt_rate > Resource.RATE_FAST and self.fast_rate_rounds < Resource.FAST_RATE_THRESHOLD:
self.fast_rate_rounds += 1
if self.fast_rate_rounds == Resource.FAST_RATE_THRESHOLD:
self.window_max = Resource.WINDOW_MAX_FAST
if self.fast_rate_rounds == 0 and self.req_data_rtt_rate < Resource.RATE_VERY_SLOW and self.very_slow_rate_rounds < Resource.VERY_SLOW_RATE_THRESHOLD:
self.very_slow_rate_rounds += 1
if self.very_slow_rate_rounds == Resource.VERY_SLOW_RATE_THRESHOLD:
self.window_max = Resource.WINDOW_MAX_VERY_SLOW
self.request_next()
else:
self.receiving_part = False
# Called on incoming resource to send a request for more data
def request_next(self):
while self.receiving_part:
sleep(0.001)
if not self.status == Resource.FAILED:
if not self.waiting_for_hmu:
self.outstanding_parts = 0
hashmap_exhausted = Resource.HASHMAP_IS_NOT_EXHAUSTED
requested_hashes = b""
i = 0; pn = self.consecutive_completed_height+1
search_start = pn
search_size = self.window
for part in self.parts[search_start:search_start+search_size]:
if part == None:
part_hash = self.hashmap[pn]
if part_hash != None:
requested_hashes += part_hash
self.outstanding_parts += 1
i += 1
else:
hashmap_exhausted = Resource.HASHMAP_IS_EXHAUSTED
pn += 1
if i >= self.window or hashmap_exhausted == Resource.HASHMAP_IS_EXHAUSTED:
break
hmu_part = bytes([hashmap_exhausted])
if hashmap_exhausted == Resource.HASHMAP_IS_EXHAUSTED:
last_map_hash = self.hashmap[self.hashmap_height-1]
hmu_part += last_map_hash
self.waiting_for_hmu = True
request_data = hmu_part + self.hash + requested_hashes
request_packet = RNS.Packet(self.link, request_data, context = RNS.Packet.RESOURCE_REQ)
try:
request_packet.send()
self.last_activity = time.time()
self.req_sent = self.last_activity
self.req_sent_bytes = len(request_packet.raw)
self.req_resp = None
except Exception as e:
RNS.log("Could not send resource request packet, cancelling resource", RNS.LOG_DEBUG)
RNS.log("The contained exception was: "+str(e), RNS.LOG_DEBUG)
self.cancel()
# Called on outgoing resource to make it send more data
def request(self, request_data):
if not self.status == Resource.FAILED:
rtt = time.time() - self.adv_sent
if self.rtt == None:
self.rtt = rtt
if self.status != Resource.TRANSFERRING:
self.status = Resource.TRANSFERRING
self.watchdog_job()
self.retries_left = self.max_retries
wants_more_hashmap = True if request_data[0] == Resource.HASHMAP_IS_EXHAUSTED else False
pad = 1+Resource.MAPHASH_LEN if wants_more_hashmap else 1
requested_hashes = request_data[pad+RNS.Identity.HASHLENGTH//8:]
# Define the search scope
search_start = self.receiver_min_consecutive_height
search_end = self.receiver_min_consecutive_height+ResourceAdvertisement.COLLISION_GUARD_SIZE
map_hashes = []
for i in range(0,len(requested_hashes)//Resource.MAPHASH_LEN):
map_hash = requested_hashes[i*Resource.MAPHASH_LEN:(i+1)*Resource.MAPHASH_LEN]
map_hashes.append(map_hash)
search_scope = self.parts[search_start:search_end]
requested_parts = list(filter(lambda part: part.map_hash in map_hashes, search_scope))
for part in requested_parts:
try:
if not part.sent:
part.send()
self.sent_parts += 1
else:
part.resend()
self.last_activity = time.time()
self.last_part_sent = self.last_activity
except Exception as e:
RNS.log("Resource could not send parts, cancelling transfer!", RNS.LOG_DEBUG)
RNS.log("The contained exception was: "+str(e), RNS.LOG_DEBUG)
self.cancel()
if wants_more_hashmap:
last_map_hash = request_data[1:Resource.MAPHASH_LEN+1]
part_index = self.receiver_min_consecutive_height
search_start = part_index
search_end = self.receiver_min_consecutive_height+ResourceAdvertisement.COLLISION_GUARD_SIZE
for part in self.parts[search_start:search_end]:
part_index += 1
if part.map_hash == last_map_hash:
break
self.receiver_min_consecutive_height = max(part_index-1-Resource.WINDOW_MAX, 0)
if part_index % ResourceAdvertisement.HASHMAP_MAX_LEN != 0:
RNS.log("Resource sequencing error, cancelling transfer!", RNS.LOG_ERROR)
self.cancel()
return
else:
segment = part_index // ResourceAdvertisement.HASHMAP_MAX_LEN
hashmap_start = segment*ResourceAdvertisement.HASHMAP_MAX_LEN
hashmap_end = min((segment+1)*ResourceAdvertisement.HASHMAP_MAX_LEN, len(self.parts))
hashmap = b""
for i in range(hashmap_start,hashmap_end):
hashmap += self.hashmap[i*Resource.MAPHASH_LEN:(i+1)*Resource.MAPHASH_LEN]
hmu = self.hash+umsgpack.packb([segment, hashmap])
hmu_packet = RNS.Packet(self.link, hmu, context = RNS.Packet.RESOURCE_HMU)
try:
hmu_packet.send()
self.last_activity = time.time()
except Exception as e:
RNS.log("Could not send resource HMU packet, cancelling resource", RNS.LOG_DEBUG)
RNS.log("The contained exception was: "+str(e), RNS.LOG_DEBUG)
self.cancel()
if self.sent_parts == len(self.parts):
self.status = Resource.AWAITING_PROOF
self.retries_left = 3
if self.__progress_callback != None:
try:
self.__progress_callback(self)
except Exception as e:
RNS.log("Error while executing progress callback from "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
def cancel(self):
"""
Cancels transferring the resource.
"""
if self.status < Resource.COMPLETE:
self.status = Resource.FAILED
if self.initiator:
if self.link.status == RNS.Link.ACTIVE:
try:
cancel_packet = RNS.Packet(self.link, self.hash, context=RNS.Packet.RESOURCE_ICL)
cancel_packet.send()
except Exception as e:
RNS.log("Could not send resource cancel packet, the contained exception was: "+str(e), RNS.LOG_ERROR)
self.link.cancel_outgoing_resource(self)
else:
self.link.cancel_incoming_resource(self)
if self.callback != None:
try:
self.link.resource_concluded(self)
self.callback(self)
except Exception as e:
RNS.log("Error while executing callbacks on resource cancel from "+str(self)+". The contained exception was: "+str(e), RNS.LOG_ERROR)
def set_callback(self, callback):
self.callback = callback
def progress_callback(self, callback):
self.__progress_callback = callback
def get_progress(self):
"""
:returns: The current progress of the resource transfer as a *float* between 0.0 and 1.0.
"""
if self.status == RNS.Resource.COMPLETE and self.segment_index == self.total_segments:
return 1.0
elif self.initiator:
if not self.split:
self.processed_parts = self.sent_parts
self.progress_total_parts = float(self.total_parts)
else:
is_last_segment = self.segment_index != self.total_segments
total_segments = self.total_segments
processed_segments = self.segment_index-1
current_segment_parts = self.total_parts
max_parts_per_segment = math.ceil(Resource.MAX_EFFICIENT_SIZE/Resource.SDU)
previously_processed_parts = processed_segments*max_parts_per_segment
if current_segment_parts < max_parts_per_segment:
current_segment_factor = max_parts_per_segment / current_segment_parts
else:
current_segment_factor = 1
self.processed_parts = previously_processed_parts + self.sent_parts*current_segment_factor
self.progress_total_parts = self.total_segments*max_parts_per_segment
else:
if not self.split:
self.processed_parts = self.received_count
self.progress_total_parts = float(self.total_parts)
else:
is_last_segment = self.segment_index != self.total_segments
total_segments = self.total_segments
processed_segments = self.segment_index-1
current_segment_parts = self.total_parts
max_parts_per_segment = math.ceil(Resource.MAX_EFFICIENT_SIZE/Resource.SDU)
previously_processed_parts = processed_segments*max_parts_per_segment
if current_segment_parts < max_parts_per_segment:
current_segment_factor = max_parts_per_segment / current_segment_parts
else:
current_segment_factor = 1
self.processed_parts = previously_processed_parts + self.received_count*current_segment_factor
self.progress_total_parts = self.total_segments*max_parts_per_segment
progress = min(1.0, self.processed_parts / self.progress_total_parts)
return progress
def get_segment_progress(self):
if self.status == RNS.Resource.COMPLETE and self.segment_index == self.total_segments:
return 1.0
elif self.initiator:
processed_parts = self.sent_parts
else:
processed_parts = self.received_count
progress = min(1.0, processed_parts / self.total_parts)
return progress
def get_transfer_size(self):
"""
:returns: The number of bytes needed to transfer the resource.
"""
return self.size
def get_data_size(self):
"""
:returns: The total data size of the resource.
"""
return self.total_size
def get_parts(self):
"""
:returns: The number of parts the resource will be transferred in.
"""
return self.total_parts
def get_segments(self):
"""
:returns: The number of segments the resource is divided into.
"""
return self.total_segments
def get_hash(self):
"""
:returns: The hash of the resource.
"""
return self.hash
def is_compressed(self):
"""
:returns: Whether the resource is compressed.
"""
return self.compressed
def __str__(self):
return "<"+RNS.hexrep(self.hash,delimit=False)+"/"+RNS.hexrep(self.link.link_id,delimit=False)+">"
class ResourceAdvertisement:
OVERHEAD = 134
HASHMAP_MAX_LEN = math.floor((RNS.Link.MDU-OVERHEAD)/Resource.MAPHASH_LEN)
COLLISION_GUARD_SIZE = 2*Resource.WINDOW_MAX+HASHMAP_MAX_LEN
assert HASHMAP_MAX_LEN > 0, "The configured MTU is too small to include any map hashes in resource advertisments"
@staticmethod
def is_request(advertisement_packet):
adv = ResourceAdvertisement.unpack(advertisement_packet.plaintext)
if adv.q != None and adv.u:
return True
else:
return False
@staticmethod
def is_response(advertisement_packet):
adv = ResourceAdvertisement.unpack(advertisement_packet.plaintext)
if adv.q != None and adv.p:
return True
else:
return False
@staticmethod
def read_request_id(advertisement_packet):
adv = ResourceAdvertisement.unpack(advertisement_packet.plaintext)
return adv.q
@staticmethod
def read_transfer_size(advertisement_packet):
adv = ResourceAdvertisement.unpack(advertisement_packet.plaintext)
return adv.t
@staticmethod
def read_size(advertisement_packet):
adv = ResourceAdvertisement.unpack(advertisement_packet.plaintext)
return adv.d
def __init__(self, resource=None, request_id=None, is_response=False):
self.link = None
if resource != None:
self.t = resource.size # Transfer size
self.d = resource.total_size # Total uncompressed data size
self.n = len(resource.parts) # Number of parts
self.h = resource.hash # Resource hash
self.r = resource.random_hash # Resource random hash
self.o = resource.original_hash # First-segment hash
self.m = resource.hashmap # Resource hashmap
self.c = resource.compressed # Compression flag
self.e = resource.encrypted # Encryption flag
self.s = resource.split # Split flag
self.i = resource.segment_index # Segment index
self.l = resource.total_segments # Total segments
self.q = resource.request_id # ID of associated request
self.u = False # Is request flag
self.p = False # Is response flag
if self.q != None:
if not resource.is_response:
self.u = True
self.p = False
else:
self.u = False
self.p = True
# Flags
self.f = 0x00 | self.p << 4 | self.u << 3 | self.s << 2 | self.c << 1 | self.e
def get_transfer_size(self):
return self.t
def get_data_size(self):
return self.d
def get_parts(self):
return self.n
def get_segments(self):
return self.l
def get_hash(self):
return self.h
def is_compressed(self):
return self.c
def get_link(self):
return self.link
def pack(self, segment=0):
hashmap_start = segment*ResourceAdvertisement.HASHMAP_MAX_LEN
hashmap_end = min((segment+1)*(ResourceAdvertisement.HASHMAP_MAX_LEN), self.n)
hashmap = b""
for i in range(hashmap_start,hashmap_end):
hashmap += self.m[i*Resource.MAPHASH_LEN:(i+1)*Resource.MAPHASH_LEN]
dictionary = {
"t": self.t, # Transfer size
"d": self.d, # Data size
"n": self.n, # Number of parts
"h": self.h, # Resource hash
"r": self.r, # Resource random hash
"o": self.o, # Original hash
"i": self.i, # Segment index
"l": self.l, # Total segments
"q": self.q, # Request ID
"f": self.f, # Resource flags
"m": hashmap
}
return umsgpack.packb(dictionary)
@staticmethod
def unpack(data):
dictionary = umsgpack.unpackb(data)
adv = ResourceAdvertisement()
adv.t = dictionary["t"]
adv.d = dictionary["d"]
adv.n = dictionary["n"]
adv.h = dictionary["h"]
adv.r = dictionary["r"]
adv.o = dictionary["o"]
adv.m = dictionary["m"]
adv.f = dictionary["f"]
adv.i = dictionary["i"]
adv.l = dictionary["l"]
adv.q = dictionary["q"]
adv.e = True if (adv.f & 0x01) == 0x01 else False
adv.c = True if ((adv.f >> 1) & 0x01) == 0x01 else False
adv.s = True if ((adv.f >> 2) & 0x01) == 0x01 else False
adv.u = True if ((adv.f >> 3) & 0x01) == 0x01 else False
adv.p = True if ((adv.f >> 4) & 0x01) == 0x01 else False
return adv
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