A scala implementation of the Lightning Network.
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README.md

Eclair Logo

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Eclair (french for Lightning) is a scala implementation of the Lightning Network. It can run with or without a GUI, and a JSON-RPC API is also available.

This software follows the Lightning Network Specifications (BOLTs). Other implementations include lightning-c, lit, and lnd.


🚧 Both the BOLTs and Eclair itself are a work in progress. Expect things to break/change!

⚠️ Eclair currently only runs on regtest or testnet.

🚨 We had reports of Eclair being tested on various segwit-enabled blockchains. Keep in mind that Eclair is still alpha quality software, by using it with actual coins you are putting your funds at risk!


Lightning Network Specification Compliance

Please see the latest release note for detailed information on BOLT compliance.

Overview

Eclair Demo

Installation

⚠️ Those are valid for the most up-to-date, unreleased, version of eclair. Here are the instructions for Eclair 0.2-alpha8.

Configuring Bitcoin Core

Eclair needs a synchronized, segwit-ready, zeromq-enabled, wallet-enabled, non-pruning, tx-indexing Bitcoin Core node. This means that on Windows you will need Bitcoin Core 0.14+.

Run bitcoind with the following minimal bitcoin.conf:

testnet=1
server=1
rpcuser=foo
rpcpassword=bar
txindex=1
zmqpubrawblock=tcp://127.0.0.1:29000
zmqpubrawtx=tcp://127.0.0.1:29000

On testnet, you also need to make sure that all your UTXOs are p2sh-of-p2wpkh. To do this, use the debug console, create a new address with getnewaddress, import it as a witness address with addwitnessaddress, and send all your balance to this witness address. If you need to create and send funds manually, don't forget to create and specify a witness address for the change output (this option is avaliable on the GUI once you set the Enable coin control features wallet option).

Installing Eclair

The released binaries can be downloaded here.

Windows

Just use the windows installer, it should create a shortcut on your desktop.

Linux, macOS or manual install on Windows

You need to first install java, more precisely a JRE 1.8.

⚠️ If you are using the OpenJDK JRE, you will need to build OpenJFX yourself, or run the application in headless mode (see below).

Then download the latest fat jar and depending on whether or not you want a GUI run the following command:

  • with GUI:
java -jar eclair-node-gui-<version>-<commit_id>.jar
  • without GUI:
java -jar eclair-node-<version>-<commit_id>.jar

Configuring Eclair

Configuration file

Eclair reads its configuration file, and write its logs, to ~/.eclair by default.

To change your node's configuration, create a file named eclair.conf in ~/.eclair. Here's an example configuration file:

eclair.server.port=9735
eclair.node-alias=eclair
eclair.node-color=49daaa

Here are some of the most common options:

name description default value
eclair.server.port Lightning TCP port 9735
eclair.api.enabled Enable/disable the API false. By default the API is disabled. If you want to enable it, you must set a password.
eclair.api.port API HTTP port 8080
eclair.api.password API password (BASIC) "" (must be set if the API is enabled)
eclair.bitcoind.rpcuser Bitcoin Core RPC user foo
eclair.bitcoind.rpcpassword Bitcoin Core RPC password bar
eclair.bitcoind.zmq Bitcoin Core ZMQ address tcp://127.0.0.1:29000
eclair.gui.unit Unit in which amounts are displayed (possible values: msat, sat, mbtc, btc) btc

Quotes are not required unless the value contains special characters. Full syntax guide here.

→ see reference.conf for full reference. There are many more options!

Java Environment Variables

Some advanced parameters can be changed with java environment variables. Most users won't need this and can skip this section.

⚠️ Using separate datadir is mandatory if you want to run several instances of eclair on the same machine. You will also have to change ports in eclair.conf (see above).

name description default value
eclair.datadir Path to the data directory ~/.eclair
eclair.headless Run eclair without a GUI
eclair.printToConsole Log to stdout (in addition to eclair.log)

For example, to specify a different data directory you would run the following command:

java -Declair.datadir=/tmp/node1 -jar eclair-node-gui-<version>-<commit_id>.jar

JSON-RPC API

method params description
getinfo return basic node information (id, chain hash, current block height)
connect nodeId, host, port open a secure connection to a lightning node
connect uri open a secure connection to a lightning node
open nodeId, fundingSatoshis, pushMsat = 0, channelFlags = 0x01 open a channel with another lightning node, by default push = 0 and channel is announced
peers list existing local peers
channels list existing local channels
channels nodeId list existing local channels opened with a particular nodeId
channel channelId retrieve detailed information about a given channel
allnodes list all known nodes
allchannels list all known channels
allupdates list all channels updates
allupdates nodeId list all channels updates for this nodeId
receive description generate a payment request without a required amount (can be useful for donations)
receive amountMsat, description generate a payment request for a given amount
send amountMsat, paymentHash, nodeId send a payment to a lightning node
send paymentRequest send a payment to a lightning node using a BOLT11 payment request
send paymentRequest, amountMsat send a payment to a lightning node using a BOLT11 payment request and a custom amount
checkpayment paymentHash returns true if the payment has been received, false otherwise
checkpayment paymentRequest returns true if the payment has been received, false otherwise
close channelId close a channel
close channelId, scriptPubKey close a channel and send the funds to the given scriptPubKey
help display available methods

Docker

A Dockerfile image is built on each commit on docker hub for running a dockerized eclair-node.

You can use the JAVA_OPTS environment variable to set arguments to eclair-node.

docker run -ti --rm -e "JAVA_OPTS=-Xmx512m -Declair.api.binding-ip=0.0.0.0 -Declair.node-alias=node-pm -Declair.printToConsole" acinq\eclair

If you want to persist the data directory, you can make the volume to your host with the -v argument, as the following example:

docker run -ti --rm -v "/path_on_host:/data" -e "JAVA_OPTS=-Declair.printToConsole" acinq\eclair

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