Generate random graph dot file for lnet

index.js

const fs = require('fs')

const args = process.argv.reduce((o, a) => {
    if(~a.indexOf('=')) {
        const kv = a.split('=')
        o[kv[0]] = kv[1]
    }
    return o
}, {})

let nodes = []
for(let i=0; i<args.count; i++) {
    nodes.push(Math.random().toString(36).substring(2, 15) + Math.random().toString(36).substring(2, 15))
} 

let graph = ''
let cons = {}
for (let i=0; i < nodes.length; i++) {
    const node = nodes[i]
    const peers = Math.floor(Math.random() * (args.maxchannels || 3)) + 1
    cons[node] = []
    for(let p = 0; p < peers; p++) {
        const d = Math.floor(Math.random() * args.count)
        if(d === i) { p--; continue } // con't connect to self, try again
        const src = nodes[d]
        if(~cons[node].indexOf(src)) { p--; continue } // only one connection
        if(cons[src] && ~cons[src].indexOf(node)) { p--; continue } // the other way
        cons[node].push(src)
        const cap = Math.floor(Math.random() * (10000000 - 500000 + 1) + 500000)
        graph += `  "${src}" -- "${node}" [capacity="${cap}"];\n`
    }
}

fs.writeFileSync(args.out, Buffer.from(`graph g {\n${graph}}`))

For creating a random configuration of lightning nodes for use with lnet

usage

node index.js count=xx maxchannels=xx out=random.dot
lnet start random.dot