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Implemented announce propagation

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This commit is contained in:
Mark Qvist 2019-11-10 10:45:52 +01:00
parent 6cdbab7e31
commit 64c30488c2
1 changed files with 46 additions and 24 deletions
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70
RNS/Transport.py
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@ -19,17 +19,18 @@ class Transport:
REACHABILITY_DIRECT = 0x01
REACHABILITY_TRANSPORT = 0x02
PATHFINDER_M = 18 # Max hops
PATHFINDER_C = 2.0 # Decay constant
PATHFINDER_R = 2 # Retransmit retries
PATHFINDER_T = 10 # Retry grace period
PATHFINDER_M = 18 # Max hops
PATHFINDER_C = 2.0 # Decay constant
PATHFINDER_R = 2 # Retransmit retries
PATHFINDER_T = 10 # Retry grace period
PATHFINDER_E = 60*15 # Path expiration in seconds
interfaces = [] # All active interfaces
destinations = [] # All active destinations
pending_links = [] # Links that are being established
active_links = [] # Links that are active
packet_hashlist = [] # A list of packet hashes for duplicate detection
receipts = [] # Receipts of all outgoing packets for proof processing
interfaces = [] # All active interfaces
destinations = [] # All active destinations
pending_links = [] # Links that are being established
active_links = [] # Links that are active
packet_hashlist = [] # A list of packet hashes for duplicate detection
receipts = [] # Receipts of all outgoing packets for proof processing
announce_table = {}
destination_table = {}
@ -107,7 +108,7 @@ class Transport:
# RNS.log("Announce entry retries: "+str(announce_entry[2]), RNS.LOG_INFO)
# RNS.log("Max retries: "+str(Transport.PATHFINDER_R), RNS.LOG_INFO)
if announce_entry[2] > Transport.PATHFINDER_R:
# RNS.log("Removing due to exceeded retries", RNS.LOG_INFO)
RNS.log("Dropping announce for "+RNS.prettyhexrep(destination_hash)+", retries exceeded", RNS.LOG_DEBUG)
Transport.announce_table.pop(destination_hash)
break
else:
@ -123,7 +124,7 @@ class Transport:
announce_destination.hexhash = announce_destination.hash.encode("hex_codec")
new_packet = RNS.Packet(announce_destination, announce_data, RNS.Packet.ANNOUNCE, header_type = RNS.Packet.HEADER_2, transport_type = Transport.TRANSPORT, transport_id = Transport.identity.hash)
new_packet.hops = announce_entry[4]
RNS.log("Rebroadcasting announce for "+RNS.prettyhexrep(announce_destination.hash)+" with hop count "+str(new_packet.hops), RNS.LOG_INFO)
RNS.log("Rebroadcasting announce for "+RNS.prettyhexrep(announce_destination.hash)+" with hop count "+str(new_packet.hops), RNS.LOG_DEBUG)
outgoing.append(new_packet)
Transport.announces_last_checked = time.time()
@ -225,23 +226,44 @@ class Transport:
announce_entry = Transport.announce_table[packet.destination_hash]
if packet.hops == announce_entry[4]+1 and announce_entry[2] > 0:
now = time.time()
if now < announce_entry[2]:
# TODO: Remove
RNS.log("Another node retransmitted our transported announce for "+RNS.prettyhexrep(packet.destination_hash)+", removing it from pending table", RNS.LOG_DEBUG)
Transport.announce_table.pop(announce_entry)
if now < announce_entry[1]:
Transport.announce_table.pop(packet.destination_hash)
else:
received_from = packet.destination_hash
# If the announce has not reached the retransmission
# limit, insert it into our pending table
# Check if this announce should be inserted into
# announce and destination tables
should_add = False
packet.hops += 1
if (packet.hops < Transport.PATHFINDER_M+1):
now = time.time()
retransmit_timeout = now + math.pow(Transport.PATHFINDER_C, packet.hops)
retries = 0
Transport.announce_table[packet.destination_hash] = [now, retransmit_timeout, retries, received_from, packet.hops, packet]
Transport.destination_table[packet.destination_hash] = [now, received_from, packet.hops]
if (not any(packet.destination_hash == d.hash for d in Transport.destinations) and packet.hops < Transport.PATHFINDER_M+1):
if packet.destination_hash in Transport.destination_table:
if packet.hops <= Transport.destination_table[packet.destination_hash][2]:
# If we already have a path to the announced
# destination, but the hop count is equal or
# less, we'll update our tables.
should_add = True
else:
# If an announce arrives with a larger hop
# count than we already have in the table,
# ignore it, unless the path is expired
if (time.time() < Transport.destination_table[packet.destination_hash][3]):
RNS.log("Replacing destination table entry for "+str(RNS.prettyhexrep(packet.destination_hash))+" with new announce due to expired path", RNS.LOG_DEBUG)
should_add = True
else:
should_add = False
else:
# If this destination is unknown in our table
# we should add it
should_add = True
if should_add:
now = time.time()
retries = 0
expires = now + Transport.PATHFINDER_E
retransmit_timeout = now + math.pow(Transport.PATHFINDER_C, packet.hops)
Transport.announce_table[packet.destination_hash] = [now, retransmit_timeout, retries, received_from, packet.hops, packet]
Transport.destination_table[packet.destination_hash] = [now, received_from, packet.hops, expires]
elif packet.packet_type == RNS.Packet.LINKREQUEST:
for destination in Transport.destinations: