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97 lines
4.8 KiB
Markdown
97 lines
4.8 KiB
Markdown
5 years ago
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# Swaplet
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## Uncharge swap (off -> on-chain)
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```
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swapcli uncharge 500
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v
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.-----------------------------.
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| Swap CLI |
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| ./cmd/swapcli |
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| .-------------------. | .--------------. .---------------.
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| | Swap Client (lib) | | | LND node | | Bitcoin node |
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| | ./ |<-------------| |-------------------| |
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| | | | | | on-chain | |
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| | |------------->| | htlc | |
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| | | | off-chain | | | |
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| '-------------------' | htlc '--------------' '---------------'
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'-----------------|-----------' | ^
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| v |
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| .--. .--.
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| _ -( )- _ _ -( )- _
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| .--,( ),--. .--,( ),--.
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initiate| _.-( )-._ _.-( )-._
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swap | ( LIGHTNING NETWORK ) ( BITCOIN NETWORK )
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| '-._( )_.-' '-._( )_.-'
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| '__,( ),__' '__,( ),__'
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| - ._(__)_. - - ._(__)_. -
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| | ^
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v v |
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.--------------------. off-chain .--------------. .---------------.
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| Swap Server | htlc | LND node | | Bitcoin node |
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| |<-------------| | | |
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| | | | on-chain | |
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| | | | htlc | |
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| |--------------| |----------------->| |
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'--------------------' '--------------' '---------------'
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```
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## Setup
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LND and the swaplet are using go modules. Make sure that the `GO111MODULE` env variable is set to `on`.
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In order to execute a swap, LND needs to be rebuilt with sub servers enabled.
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### LND
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* Checkout branch `master`
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- `make install tags="signrpc walletrpc chainrpc"` to build and install lnd with required sub-servers enabled.
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- Make sure there are no macaroons in the lnd dir `~/.lnd/data/chain/bitcoin/mainnet`. If there are, lnd has been started before and in that case, it could be that `admin.macaroon` doesn't contain signer permission. Delete `macaroons.db` and `*.macaroon`.
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DO NOT DELETE `wallet.db` !
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- Start lnd
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### Swaplet
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- `git clone git@gitlab.com:lightning-labs/swaplet.git`
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- `cd swaplet/cmd`
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- `go install ./...`
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## Execute a swap
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* Swaps are executed by a client daemon process. Run:
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`swapd`
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By default `swapd` attempts to connect to an lnd instance running on `localhost:10009` and reads the macaroon and tls certificate from `~/.lnd`. This can be altered using command line flags. See `swapd --help`.
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`swapd` only listens on localhost and uses an unencrypted and unauthenticated connection.
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* To initiate a swap, run:
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`swapcli uncharge <amt_msat>`
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When the swap is initiated successfully, `swapd` will see the process through.
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* To query and track the swap status, run `swapcli` without arguments.
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## Resume
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When `swapd` is terminated (or killed) for whatever reason, it will pickup pending swaps after a restart.
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Information about pending swaps is stored persistently in the swap database. Its location is `~/.swaplet/<network>/swapclient.db`.
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## Multiple simultaneous swaps
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It is possible to execute multiple swaps simultaneously.
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