527 lines
6.9 KiB
Groff
527 lines
6.9 KiB
Groff
'\" t
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.\" Title: lightning-getroute
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.\" Author: [see the "AUTHOR" section]
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.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
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.\" Date: 02/16/2019
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.\" Manual: \ \&
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.\" Source: \ \&
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.\" Language: English
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.\"
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.TH "LIGHTNING\-GETROUTE" "7" "02/16/2019" "\ \&" "\ \&"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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lightning-getroute \- Command for routing a payment (low\-level)\&.
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.SH "SYNOPSIS"
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.sp
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\fBgetroute\fR \fIid\fR \fImsatoshi\fR \fIriskfactor\fR [\fIcltv\fR] [\fIfromid\fR] [\fIfuzzpercent\fR]
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.SH "DESCRIPTION"
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.sp
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The \fBgetroute\fR RPC command attempts to find the best route for the payment of \fImsatoshi\fR to lightning node \fIid\fR, such that the payment will arrive at \fIid\fR with \fIcltv\fR\-blocks to spare (default 9)\&.
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.sp
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There are two considerations for how good a route is: how low the fees are, and how long your payment will get stuck in a delayed output if a node goes down during the process\&. The \fIriskfactor\fR floating\-point field controls this tradeoff; it is the annual cost of your funds being stuck (as a percentage)\&.
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.sp
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For example, if you thought the convenience of keeping your funds liquid (not stuck) was worth 20% per annum interest, \fIriskfactor\fR would be 20\&.
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.sp
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If you didn\(cqt care about risk, \fIriskfactor\fR would be zero\&.
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.sp
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\fIfromid\fR is the node to start the route from: default is this node\&.
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.sp
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The \fIfuzzpercent\fR is a positive floating\-point number, representing a percentage of the actual fee\&. The \fIfuzzpercent\fR 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\&.
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.SH "RISKFACTOR EFFECT ON ROUTING"
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.sp
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The risk factor is treated as if it were an additional fee on the route, for the purposes of comparing routes\&.
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.sp
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The formula used is the following approximation:
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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risk\-fee = amount x blocks\-timeout x per\-block\-cost
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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We are given a \fIriskfactor\fR expressed as a percentage\&. There are 52596 blocks per year, thus \fIper\-block\-cost\fR is \fIriskfactor\fR divided by 5,259,600\&.
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.sp
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The final result is:
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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risk\-fee = amount x blocks\-timeout x riskfactor / 5259600
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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Here are the risk fees in millisatoshis, using various parameters\&. I assume a channel charges the default of 1000 millisatoshis plus 1 part\-per\-million\&. Common to_self_delay values on the network at 14 and 144 blocks\&.
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.TS
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allbox tab(:);
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ltB ltB ltB ltB ltB.
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T{
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Amount (msat)
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T}:T{
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Riskfactor
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T}:T{
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Delay
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T}:T{
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Risk Fee
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T}:T{
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Route fee
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T}
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.T&
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt
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lt lt lt lt lt.
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T{
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.sp
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10,000
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T}:T{
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.sp
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1
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T}:T{
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.sp
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14
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T}:T{
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.sp
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0
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T}:T{
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.sp
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1001
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T}
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T{
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.sp
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10,000
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T}:T{
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.sp
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10
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T}:T{
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.sp
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14
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T}:T{
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.sp
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0
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T}:T{
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.sp
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1001
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T}
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T{
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.sp
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10,000
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T}:T{
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.sp
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100
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T}:T{
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.sp
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14
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T}:T{
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.sp
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2
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T}:T{
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.sp
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1001
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T}
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T{
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.sp
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10,000
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T}:T{
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.sp
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1000
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T}:T{
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.sp
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14
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T}:T{
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.sp
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26
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T}:T{
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.sp
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1001
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T}
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T{
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.sp
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1,000,000
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T}:T{
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.sp
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1
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T}:T{
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.sp
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14
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T}:T{
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.sp
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2
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T}:T{
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.sp
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1001
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T}
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T{
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.sp
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1,000,000
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T}:T{
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.sp
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10
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T}:T{
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.sp
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14
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T}:T{
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.sp
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26
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T}:T{
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.sp
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1001
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T}
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T{
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.sp
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1,000,000
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T}:T{
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.sp
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100
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T}:T{
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.sp
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14
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T}:T{
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.sp
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266
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T}:T{
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.sp
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1001
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T}
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T{
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.sp
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1,000,000
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T}:T{
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.sp
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1000
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T}:T{
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.sp
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14
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T}:T{
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.sp
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2661
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T}:T{
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.sp
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1001
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T}
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T{
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.sp
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100,000,000
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T}:T{
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.sp
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1
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T}:T{
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.sp
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14
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T}:T{
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.sp
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266
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T}:T{
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.sp
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1100
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T}
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T{
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.sp
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100,000,000
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T}:T{
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.sp
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10
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T}:T{
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.sp
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14
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T}:T{
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2661
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T}:T{
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.sp
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1100
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T}
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T{
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100,000,000
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T}:T{
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100
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T}:T{
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14
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T}:T{
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26617
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T}:T{
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.sp
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1100
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T}
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T{
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100,000,000
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T}:T{
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1000
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T}:T{
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14
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T}:T{
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266179
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T}:T{
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.sp
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1100
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T}
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T{
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10,000
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T}:T{
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1
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T}:T{
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144
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T}:T{
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0
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T}:T{
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.sp
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1001
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T}
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T{
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.sp
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10,000
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T}:T{
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.sp
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10
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T}:T{
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.sp
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144
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T}:T{
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.sp
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2
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T}:T{
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.sp
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1001
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T}
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T{
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.sp
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10,000
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T}:T{
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100
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T}:T{
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144
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T}:T{
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27
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T}:T{
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.sp
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1001
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T}
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T{
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.sp
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10,000
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T}:T{
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1000
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T}:T{
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.sp
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144
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T}:T{
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.sp
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273
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T}:T{
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.sp
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1001
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T}
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T{
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.sp
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1,000,000
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T}:T{
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.sp
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1
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T}:T{
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.sp
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144
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T}:T{
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27
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T}:T{
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.sp
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1001
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T}
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T{
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.sp
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1,000,000
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T}:T{
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.sp
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10
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T}:T{
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.sp
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144
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T}:T{
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.sp
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273
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T}:T{
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.sp
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1001
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T}
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T{
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1,000,000
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T}:T{
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100
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T}:T{
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.sp
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144
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T}:T{
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2737
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T}:T{
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1001
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T}
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T{
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1,000,000
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1000
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144
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27378
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1001
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T}
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T{
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100,000,000
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1
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144
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2737
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T}:T{
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1100
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T}
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T{
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100,000,000
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10
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144
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T}:T{
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27378
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1100
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T}
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T{
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100,000,000
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T}:T{
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100
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T}:T{
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144
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T}:T{
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273785
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T}:T{
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1100
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T}
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T{
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100,000,000
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T}:T{
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1000
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T}:T{
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144
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T}:T{
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2737850
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T}:T{
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.sp
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1100
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T}
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.TE
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.sp 1
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.SH "RECOMMENDED RISKFACTOR VALUES"
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.sp
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The default \fIfuzz\fR factor is 5%, so as you can see from the table above, that tends to overwhelm the effect of \fIriskfactor\fR less than about 5\&.
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.sp
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1 is a conservative value for a stable lightning network with very few failures\&.
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.sp
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1000 is an aggressive value for trying to minimize timeouts at all costs\&.
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.sp
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The default for lightning\-pay(7) is 10, which starts to become a major factor for larger amounts, and is basically ignored for tiny ones\&.
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.SH "RETURN VALUE"
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.sp
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On success, a "route" array is returned\&. Each array element contains \fIid\fR (the node being routed through), \fImsatoshi\fR (the millisatoshis sent), and \fIdelay\fR (the number of blocks to timeout at this node)\&.
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.sp
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The final \fIid\fR will be the destination \fIid\fR given in the input\&. The difference between the first \fImsatoshi\fR minus the \fImsatoshi\fR given in the input is the fee\&. The first \fIdelay\fR is the very worst case timeout for the payment failure, in blocks\&.
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.SH "AUTHOR"
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.sp
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Rusty Russell <rusty@rustcorp\&.com\&.au> is mainly responsible\&.
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.SH "SEE ALSO"
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.sp
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lightning\-pay(7), lightning\-sendpay(7)\&.
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.SH "RESOURCES"
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.sp
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Main web site: https://github\&.com/ElementsProject/lightning
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