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Linearized announce propagation delays for supporting up to 128 hops

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Mark Qvist 2022-04-17 18:27:35 +02:00
parent fef5ed6bad
commit 7923322d92
1 changed files with 8 additions and 5 deletions
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13
RNS/Transport.py
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@ -52,12 +52,13 @@ class Transport:
""" """
Maximum amount of hops that Reticulum will transport a packet. Maximum amount of hops that Reticulum will transport a packet.
""" """
PATHFINDER_C = 1.8 # Decay constant PATHFINDER_C = 1.094334 # Exponential delay coefficient
PATHFINDER_D = 10 # Fixed per-hop delay
PATHFINDER_R = 1 # Retransmit retries PATHFINDER_R = 1 # Retransmit retries
PATHFINDER_T = 10 # Retry grace period PATHFINDER_T = 10 # Retry grace period
PATHFINDER_RW = 10 # Random window for announce rebroadcast PATHFINDER_RW = 5 # Random window for announce rebroadcast
PATHFINDER_E = 60*60*24*7 # Path expiration in seconds PATHFINDER_E = 60*60*24*7 # Path expiration of one week
AP_PATH_TIME = 60*60*24 # Expiration for Access Point paths AP_PATH_TIME = 60*60*24 # Path expiration of one day for Access Point paths
# TODO: Calculate an optimal number for this in # TODO: Calculate an optimal number for this in
# various situations # various situations
@ -299,6 +300,7 @@ class Transport:
break break
else: else:
if time.time() > announce_entry[1]: if time.time() > announce_entry[1]:
# announce_entry[1] = time.time() + math.pow(Transport.PATHFINDER_C, announce_entry[4]) + Transport.PATHFINDER_T + Transport.PATHFINDER_RW
announce_entry[1] = time.time() + math.pow(Transport.PATHFINDER_C, announce_entry[4]) + Transport.PATHFINDER_T + Transport.PATHFINDER_RW announce_entry[1] = time.time() + math.pow(Transport.PATHFINDER_C, announce_entry[4]) + Transport.PATHFINDER_T + Transport.PATHFINDER_RW
announce_entry[2] += 1 announce_entry[2] += 1
packet = announce_entry[5] packet = announce_entry[5]
@ -329,6 +331,7 @@ class Transport:
RNS.log("Rebroadcasting announce as path response for "+RNS.prettyhexrep(announce_destination.hash)+" with hop count "+str(new_packet.hops), RNS.LOG_DEBUG) RNS.log("Rebroadcasting announce as path response for "+RNS.prettyhexrep(announce_destination.hash)+" with hop count "+str(new_packet.hops), RNS.LOG_DEBUG)
else: else:
RNS.log("Rebroadcasting announce for "+RNS.prettyhexrep(announce_destination.hash)+" with hop count "+str(new_packet.hops), RNS.LOG_DEBUG) RNS.log("Rebroadcasting announce for "+RNS.prettyhexrep(announce_destination.hash)+" with hop count "+str(new_packet.hops), RNS.LOG_DEBUG)
outgoing.append(new_packet) outgoing.append(new_packet)
# This handles an edge case where a peer sends a past # This handles an edge case where a peer sends a past
@ -920,7 +923,7 @@ class Transport:
local_rebroadcasts = 0 local_rebroadcasts = 0
block_rebroadcasts = False block_rebroadcasts = False
attached_interface = None attached_interface = None
retransmit_timeout = now + math.pow(Transport.PATHFINDER_C, packet.hops) + (RNS.rand() * Transport.PATHFINDER_RW) retransmit_timeout = now + math.pow(Transport.PATHFINDER_C, packet.hops) + (PATHFINDER_D*packet.hops) + (RNS.rand() * Transport.PATHFINDER_RW)
if packet.receiving_interface.mode == RNS.Interfaces.Interface.Interface.MODE_ACCESS_POINT: if packet.receiving_interface.mode == RNS.Interfaces.Interface.Interface.MODE_ACCESS_POINT:
expires = now + Transport.AP_PATH_TIME expires = now + Transport.AP_PATH_TIME