mirror of
https://github.com/lightninglabs/loop
synced 2024-11-09 19:10:47 +00:00
552fdaeb28
To help with development of apps that use the Loop daemon (`loopd`) for liquidity management, it is often useful to test it in controlled environments such as on the Bitcoin `regtest` network. Lightning Labs provides a stripped down version of the Loop server that works only for `regtest` and is only published in compiled, binary form (currently as a Docker image). The `docker-compose.yml` shows an example setup and is accompanied by a quick start script that should make getting started very easy.
189 lines
6.6 KiB
Markdown
189 lines
6.6 KiB
Markdown
# Local regtest setup
|
|
|
|
To help with development of apps that use the Loop daemon (`loopd`) for
|
|
liquidity management, it is often useful to test it in controlled environments
|
|
such as on the Bitcoin `regtest` network.
|
|
|
|
Lightning Labs provides a stripped down version of the Loop server that works
|
|
only for `regtest` and is only published in compiled, binary form (currently as
|
|
a Docker image).
|
|
|
|
The `docker-compose.yml` shows an example setup and is accompanied by a quick
|
|
start script that should make getting started very easy.
|
|
|
|
## Requirements
|
|
|
|
To get this quick start demo environment operational, you need to have the
|
|
following tools installed on your system:
|
|
- Docker
|
|
- `docker-compose`
|
|
- `jq`
|
|
- `git`
|
|
|
|
## Starting the environment
|
|
|
|
Simply download the Loop repository and run the `start` command of the helper
|
|
script. This will boot up the `docker-compose` environment, mine some `regtest`
|
|
coins, connect and create channels between the two `lnd` nodes and hook up the
|
|
Loop client and servers to each other.
|
|
|
|
```shell
|
|
$ git clone https://github.com/lightninglabs/loop
|
|
$ cd loop/regtest
|
|
$ ./regtest.sh start
|
|
```
|
|
|
|
## Looping out
|
|
|
|
Looping out is the process of moving funds from your channel (off-chain) balance
|
|
into your on-chain wallet through what is called a submarine swap. We use the
|
|
`--fast` option here, otherwise the server would wait 30 minutes before
|
|
proceeding to allow for batched swaps.
|
|
|
|
```shell
|
|
$ ./regtest.sh loop out --amt 500000 --fast
|
|
Send off-chain: 500000 sat
|
|
Receive on-chain: 492688 sat
|
|
Estimated total fee: 7312 sat
|
|
|
|
Fast swap requested.
|
|
|
|
CONTINUE SWAP? (y/n): y
|
|
Swap initiated
|
|
ID: f96b2e40fd75a63eba61a6ee1e0b17788d77804c0454beb5fbbe4a42a8a06245
|
|
HTLC address: bcrt1qwgzsmag0579twr4d8hgfvarqxn27mdmdgfh7wc2hdlupsfqtxwyq5zltqn
|
|
|
|
Run `loop monitor` to monitor progress.
|
|
```
|
|
|
|
The swap has been initiated now. Let's observe how it works:
|
|
|
|
```shell
|
|
$ ./regtest.sh loop monitor
|
|
Note: offchain cost may report as 0 after loopd restart during swap
|
|
2021-03-19T17:01:39Z LOOP_OUT INITIATED 0.005 BTC - bcrt1qwgzsmag0579twr4d8hgfvarqxn27mdmdgfh7wc2hdlupsfqtxwyq5zltqn
|
|
```
|
|
|
|
Leave the command running, it will update with every new event. Open a second
|
|
terminal window in the same folder/location and mine one block:
|
|
|
|
```shell
|
|
$ ./regtest.sh mine 1
|
|
```
|
|
|
|
You should see your previous window with the `monitor` command update:
|
|
|
|
```shell
|
|
2021-03-19T17:01:39Z LOOP_OUT INITIATED 0.005 BTC - bcrt1qwgzsmag0579twr4d8hgfvarqxn27mdmdgfh7wc2hdlupsfqtxwyq5zltqn
|
|
2021-03-19T17:04:37Z LOOP_OUT PREIMAGE_REVEALED 0.005 BTC - bcrt1qwgzsmag0579twr4d8hgfvarqxn27mdmdgfh7wc2hdlupsfqtxwyq5zltqn
|
|
```
|
|
|
|
As soon as the `PREIMAGE_REVEALED` message appears, you know the HTLC was
|
|
published to the chain. Finish the process by mining yet another block (in the
|
|
second terminal window):
|
|
|
|
```shell
|
|
$ ./regtest.sh mine 1
|
|
```
|
|
|
|
Your `monitor` window should now show the completion of the swap:
|
|
|
|
```shell
|
|
2021-03-19T17:01:39Z LOOP_OUT INITIATED 0.005 BTC - bcrt1qwgzsmag0579twr4d8hgfvarqxn27mdmdgfh7wc2hdlupsfqtxwyq5zltqn
|
|
2021-03-19T17:04:37Z LOOP_OUT PREIMAGE_REVEALED 0.005 BTC - bcrt1qwgzsmag0579twr4d8hgfvarqxn27mdmdgfh7wc2hdlupsfqtxwyq5zltqn
|
|
2021-03-19T17:06:25Z LOOP_OUT SUCCESS 0.005 BTC - bcrt1qwgzsmag0579twr4d8hgfvarqxn27mdmdgfh7wc2hdlupsfqtxwyq5zltqn (cost: server 50, onchain 6687, offchain 0)
|
|
```
|
|
|
|
Congratulations, you just did a loop out!
|
|
|
|
# Loop in
|
|
|
|
Looping in is very similar but does the opposite: swap your on-chain balance for
|
|
off-chain (channel) balance:
|
|
|
|
```shell
|
|
$ ./regtest.sh loop in --amt 500000
|
|
Send on-chain: 500000 sat
|
|
Receive off-chain: 492279 sat
|
|
Estimated total fee: 7721 sat
|
|
|
|
CONTINUE SWAP? (y/n): y
|
|
Swap initiated
|
|
ID: d95167e33e79df292e5ffeda29d34614a5a087c9378ffae003b9a25bb0f1c2e4
|
|
HTLC address (P2WSH): bcrt1q4p0pead4tfepm683fff8fl8g3kpx8spjztuquu2sctfzed9rufls2z0g2f
|
|
|
|
Run `loop monitor` to monitor progress.
|
|
|
|
|
|
$ ./regtest.sh loop monitor
|
|
Note: offchain cost may report as 0 after loopd restart during swap
|
|
2021-03-19T17:17:13Z LOOP_IN HTLC_PUBLISHED 0.005 BTC - P2WSH: bcrt1q4p0pead4tfepm683fff8fl8g3kpx8spjztuquu2sctfzed9rufls2z0g2f
|
|
```
|
|
|
|
In your second terminal window, go ahead and mine a block:
|
|
|
|
```shell
|
|
$ ./regtest.sh mine 1
|
|
```
|
|
|
|
You should see your previous window with the `monitor` command update:
|
|
|
|
```shell
|
|
2021-03-19T17:17:13Z LOOP_IN HTLC_PUBLISHED 0.005 BTC - P2WSH: bcrt1q4p0pead4tfepm683fff8fl8g3kpx8spjztuquu2sctfzed9rufls2z0g2f
|
|
2021-03-19T17:18:38Z LOOP_IN INVOICE_SETTLED 0.005 BTC - P2WSH: bcrt1q4p0pead4tfepm683fff8fl8g3kpx8spjztuquu2sctfzed9rufls2z0g2f (cost: server -499929, onchain 7650, offchain 0)
|
|
```
|
|
|
|
After mining yet another block, the process should complete:
|
|
|
|
```shell
|
|
$ ./regtest.sh mine 1
|
|
```
|
|
|
|
```shell
|
|
2021-03-19T17:17:13Z LOOP_IN HTLC_PUBLISHED 0.005 BTC - P2WSH: bcrt1q4p0pead4tfepm683fff8fl8g3kpx8spjztuquu2sctfzed9rufls2z0g2f
|
|
2021-03-19T17:18:38Z LOOP_IN INVOICE_SETTLED 0.005 BTC - P2WSH: bcrt1q4p0pead4tfepm683fff8fl8g3kpx8spjztuquu2sctfzed9rufls2z0g2f (cost: server -499929, onchain 7650, offchain 0)
|
|
2021-03-19T17:19:21Z LOOP_IN SUCCESS 0.005 BTC - P2WSH: bcrt1q4p0pead4tfepm683fff8fl8g3kpx8spjztuquu2sctfzed9rufls2z0g2f (cost: server 71, onchain 7650, offchain 0)
|
|
```
|
|
|
|
# Using the Loop server in an existing setup
|
|
|
|
This `docker-compose` is only meant as a demo and quick start help. You can of
|
|
course also integrate the Loop server Docker image into your existing `regtest`
|
|
environment.
|
|
|
|
Simply pull the image and run it by pointing it to an existing `lnd` node:
|
|
|
|
```shell
|
|
$ docker pull lightninglabs/loopserver:latest
|
|
$ docker run -d \
|
|
-p 11009:11009 \
|
|
-v /some/dir/to/lnd:/root/.lnd \
|
|
lightninglabs/loopserver:latest \
|
|
daemon \
|
|
--maxamt=5000000 \
|
|
--lnd.host=some-lnd-node:10009 \
|
|
--lnd.macaroondir=/root/.lnd/data/chain/bitcoin/regtest \
|
|
--lnd.tlspath=/root/.lnd/tls.cert \
|
|
```
|
|
|
|
An existing Loop client (`loopd`) can then be pointed to this server with:
|
|
|
|
```shell
|
|
$ loopd \
|
|
--network=regtest \
|
|
--debuglevel=debug \
|
|
--server.host=localhost:11009 \
|
|
--server.notls \
|
|
--lnd.host=some-other-lnd-node:10009 \
|
|
--lnd.macaroonpath=/root/.lnd/data/chain/bitcoin/regtest/admin.macaroon \
|
|
--lnd.tlspath=/root/.lnd/tls.cert
|
|
```
|
|
|
|
The `--server.notls` is important here as the `regtest` version of the Loop
|
|
server only supports insecure, non-TLS connections.
|
|
|
|
Also make sure you connect the Loop server and Loop client to a different `lnd`
|
|
node each since an `lnd` node cannot pay itself. Obviously there also need to be
|
|
some channels with enough liquidity between the server's and client's `lnd`
|
|
nodes (direct or indirect doesn't matter).
|