fairlayer / fair

Fairlayer node in JS

Intro

Fairlayer is a two-layered blockchain capable of processing billion+ transaction per second. It implements the idea of Extended Lightning Network XLN.

Our goal is to keep it easy to be a full node on any laptop, no matter how many payments happen on the second layer. The node processes few publicly broadcasted onchain transactions (insurance rebalances, disputes etc). All the payments happen instantly offchain and can be enforced in onchain "court" when needed.

Installation

This repo contains generic code not attached to any network, by design. Use ./simulate to start local private network.

For existing public network, go to a validator website and find Install page (https://fairlayer.com/#install). This will use latest state and latest code automatically.

When you install on a server, pass -s/--silent to switch off opn that tries to open a browser with the wallet for you. The script will simply output the URL with auth_code you need to visit.

For full documentation go to wiki

fair's Issues

Pagination in explorer and public lists

Now all is thrown into a single page. Some basic pagination is needed for onchain explorer.

Generated .tar snapshots are still NOT deterministic?

With ./simulate running we see two different hashes on Install page for member 1 and 2. This must be equal hash, and the underlying data in .tar is identitcal. Something must be wrong with .tar() generation though last time I did my best to do it deterministic. Help would be great!

Implementing basic state machine with hashlocks

shepherd.js usage

👋 Hello! I see you are using shepherd.js in this project. We are so pleased to see that! We would love to showcase your usage in the Shepherd docs, and we would love to hear how things have been going for you using it. What has worked well, do you have any feature requests or improvements, etc. Please let us know!

Little UI things

• clipboard js to copy invoice automatically

• filters on payment history

Running a node on Ubuntu 16.04

What are the steps/commands to run a testnet node on a Linux platform? Below are the steps I have tried (with Node v9.11.1 via nvm) .

a. git clone https://github.com/fairlayer/fair && cd fair
b. ./install
c. node fair
Resulting command line :
Reading db data/onchain/db.sqlite
Reading and syncing offchain db: sqlite
Loading K data
[Error] Unable to read "./data/onchain/k.json", quitting
(node:9994) UnhandledPromiseRejectionWarning: Error: ENOENT: no such file or directory, open './data/onchain/k.json'
at Object.fs.openSync (fs.js:660:18)
at Object.fs.readFileSync (fs.js:565:33)
at loadKFile (/home/decryptoed/FairLayer/fair/src/fair.js:81:19)
at startFairlayer (/home/decryptoed/FairLayer/fair/src/fair.js:162:7)
at
(node:9994) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:9994) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

a. git clone https://github.com/fairlayer/fair && cd fair
b. ./deploy
Resulting command line :
yarn install v1.9.2
[1/4] Resolving packages...
[2/4] Fetching packages...
info [email protected]: The platform "linux" is incompatible with this module.
info "[email protected]" is an optional dependency and failed compatibility check. Excluding it from installation.
[3/4] Linking dependencies...
[4/4] Building fresh packages...
success Saved lockfile.
Done in 4.14s.

@ build /home/decryptoed/FairLayer/fair
parcel build wallet/index.html

⏳ Building bootstrap.min.css...
Node#moveTo was deprecated. Use Container#append.
✨ Built in 9.99s.

dist/main.795f3128.js 299.45 KB 28.89s
dist/chart.63163a79.js 145.45 KB 3.26s
dist/bootstrap.min.20abbb74.css 118.87 KB 520ms
dist/notyf.d8b8ab42.js 2.96 KB 1.60s
dist/notyf.efdd8d3b.css 2.11 KB 77ms
dist/reddit.c46e82d0.svg 2.05 KB 58ms
dist/main.5648710d.css 1020 B 63ms
dist/index.html 1013 B 400ms
dist/github.01dc78db.svg 898 B 58ms
dist/twitter.75ac189e.svg 830 B 58ms
dist/atelier-dune-dark.a1c3758f.css 587 B 85ms
dist/medium.3464a892.svg 552 B 58ms
dist/notyf.d8b8ab42.map 0 B 1.63s
dist/chart.63163a79.map 0 B 3.30s
dist/main.bd03407c.map 0 B 28.91s
./prod: line 33: pm2: command not found
Reading db data/onchain/db.sqlite
Reading and syncing offchain db: mysql
(node:10242) UnhandledPromiseRejectionWarning: SequelizeConnectionRefusedError: connect ECONNREFUSED 127.0.0.1:3306
at Utils.Promise.tap.then.catch.err (/home/decryptoed/FairLayer/fair/node_modules/sequelize/lib/dialects/mysql/connection-manager.js:139:19)
at tryCatcher (/home/decryptoed/FairLayer/fair/node_modules/bluebird/js/release/util.js:16:23)
at Promise._settlePromiseFromHandler (/home/decryptoed/FairLayer/fair/node_modules/bluebird/js/release/promise.js:512:31)
at Promise._settlePromise (/home/decryptoed/FairLayer/fair/node_modules/bluebird/js/release/promise.js:569:18)
at Promise._settlePromise0 (/home/decryptoed/FairLayer/fair/node_modules/bluebird/js/release/promise.js:614:10)
at Promise._settlePromises (/home/decryptoed/FairLayer/fair/node_modules/bluebird/js/release/promise.js:689:18)
at Async._drainQueue (/home/decryptoed/FairLayer/fair/node_modules/bluebird/js/release/async.js:133:16)
at Async._drainQueues (/home/decryptoed/FairLayer/fair/node_modules/bluebird/js/release/async.js:143:10)
at Immediate.Async.drainQueues [as _onImmediate] (/home/decryptoed/FairLayer/fair/node_modules/bluebird/js/release/async.js:17:14)
at runCallback (timers.js:763:18)
at tryOnImmediate (timers.js:734:5)
at processImmediate (timers.js:716:5)
at process.topLevelDomainCallback (domain.js:102:23)
(node:10242) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:10242) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
./prod: line 38: pm2: command not found

Proposer's behavior

Hi guys

You have a very promising project. I'm also working on something right now and try to get involved in reading other peoples code, especially new projects. Consensus is hard, so any opportunity of improving understanding is priceless.

I'm mainly a Java developer, so I apologize if I say some bullshit here)

I looked through the code and can admit it is an interesting idea - replacing PBFT view changes with just time rounds. It makes it more similar to DPOS actually, without sacrificing finality. If I understood it correctly of course.

Regarding the code, I've got a couple of minor question:

1. Is there a control of how many proposals can active validator do in it's round? And how many prevotes/precommits can other validators do in the same round for the same height? I was not able to find such a check, but it might be because of my poor JavaScript skills. I the case these check are absent, I would suggest to add them as otherwise it is possible to lock the majority of validators on different blocks.

2. In process_block.js, line 114 if (!result.success) l(result) , shouldn't it be if (!result.success) l(result); return; as it looks like we are accepting block with partially incorrect transactions.

Thank you, again, very interesting project. I should find more time and read how is the planned performance will be achieved and probably steal some ideas from you)