You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
119 lines
3.7 KiB
119 lines
3.7 KiB
LIGHTNING-GETROUTE(7)
|
|
=====================
|
|
:doctype: manpage
|
|
|
|
NAME
|
|
----
|
|
lightning-getroute - Command for routing a payment (low-level).
|
|
|
|
|
|
SYNOPSIS
|
|
--------
|
|
*getroute* 'id' 'msatoshi' 'riskfactor' ['cltv'] ['fromid'] ['fuzzpercent']
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
The *getroute* RPC command attempts to find the best route for the payment
|
|
of 'msatoshi' to lightning node 'id', such that the payment will arrive
|
|
at 'id' with 'cltv'-blocks to spare (default 9).
|
|
|
|
There are two considerations for how good a route is: how low the
|
|
fees are, and how long your payment will get stuck if a node goes down
|
|
during the process. The 'riskfactor' floating-point field controls
|
|
this tradeoff; it is the annual cost of your funds being stuck (as a
|
|
percentage), multiplied by the percentage chance of each node failing.
|
|
|
|
For example, if you thought there was a 1% chance that a node would
|
|
fail, and it would cost you 20% per annum if that happened,
|
|
'riskfactor' would be 20.
|
|
|
|
If you didn't care about risk, 'riskfactor' would be zero.
|
|
|
|
'fromid' is the node to start the route from: default is this node.
|
|
|
|
The 'fuzzpercent' is a positive floating-point number, representing a percentage of the actual fee.
|
|
The 'fuzzpercent' is used to distort computed fees along each channel,
|
|
to provide some randomization to the route generated.
|
|
0.0 means the exact fee of that channel is used,
|
|
while 100.0 means the fee used might be from 0 to twice the actual fee.
|
|
The default is 5.0, or up to 5% fee distortion.
|
|
|
|
|
|
RISKFACTOR EFFECT ON ROUTING
|
|
----------------------------
|
|
The risk factor is treated as if it were an additional fee on the route,
|
|
for the purposes of comparing routes.
|
|
|
|
The formula used is the following approximation:
|
|
----
|
|
hop-risk = num-hops x per-hop-risk
|
|
timeout-cost = blocks-timeout x per-block-cost
|
|
risk-fee = amount x hop-risk x timeout-cost
|
|
----
|
|
|
|
We are given a 'riskfactor'; expressed as two multiplied percentages
|
|
is the same as fractions multiplied by 10000. There are 52596 blocks
|
|
per year, thus 'per-block-cost' x 'per-hop-risk' is riskfactor'
|
|
divided by 5,259,600,000.
|
|
|
|
The final result is:
|
|
----
|
|
risk-fee = amount x num-hops x blocks-timeout x riskfactor / 5259600000
|
|
----
|
|
|
|
Here are the risk fees as a percentage of the amount sent, using
|
|
various parameters. For comparison with actual fees, we assume nodes
|
|
charge 0.05%:
|
|
|
|
[options="header"]
|
|
|=======================
|
|
|Riskfactor |Nodes | Delay per node |Risk Fee % |Route fee %
|
|
|0.001 |5 | 6 |0 |0.25
|
|
|1 |5 | 6 |0 |0.25
|
|
|1000 |5 | 6 |0.0029 |0.25
|
|
|
|
|0.001 |10 | 72 |0 |0.5
|
|
|1 |10 | 72 |0.0001 |0.5
|
|
|1000 |10 | 72 |0.1369 |0.5
|
|
|
|
|0.001 |20 | 1008 |0 |1.0
|
|
|1 |20 | 1008 |0.0077 |1.0
|
|
|1000 |20 | 1008 |7.6660 |1.0
|
|
|=======================
|
|
|
|
RECOMMENDED RISKFACTOR VALUES
|
|
-----------------------------
|
|
0.001 is a value for tie-breaking in favor of shorter routes, but not really
|
|
costing in any risk.
|
|
|
|
1 is a conservative value for a stable lightning network with very few
|
|
failures.
|
|
|
|
1000 is an aggressive value for trying to minimize timeouts at all
|
|
costs.
|
|
|
|
RETURN VALUE
|
|
------------
|
|
|
|
On success, a "route" array is returned. Each array element contains
|
|
{id} (the node being routed through), {msatoshi} (the millisatoshis
|
|
sent), and {delay} (the number of blocks to timeout at this node).
|
|
|
|
The final {id} will be the destination {id} given in the input. The
|
|
difference between the first {msatoshi} minus the {msatoshi} given in
|
|
the input is the fee. The first {delay} is the very worst case
|
|
timeout for the payment failure, in blocks.
|
|
|
|
//FIXME:Enumerate errors
|
|
|
|
AUTHOR
|
|
------
|
|
Rusty Russell <rusty@rustcorp.com.au> is mainly responsible.
|
|
|
|
SEE ALSO
|
|
--------
|
|
lightning-pay(7), lightning-sendpay(7).
|
|
|
|
RESOURCES
|
|
---------
|
|
Main web site: https://github.com/ElementsProject/lightning
|
|
|