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Trying the swap locally

Requirements

Operating System

The code base is only tested regularly with Ubuntu 22.04 on X86-64, but we would like to support most 64-bit Linux distributions, macOS, and WSL on Windows both with X86-64 and ARM processors.

Installed Dependencies for Building/Testing

  • go 1.21+ (see build instructions to download Go.)
  • node/npm (to install ganache, see suggestions after list)
  • ganache (can be installed with npm install --location=global ganache)
  • jq, curl, bzip2, realpath

The suggested way to install node/npm is using nvm. If you install npm using a package manager like snap, ensure the install prefix (npm config get prefix) is a directory that you have write access to without sudo. You can change the directory with this command:

npm config set prefix ~/.npm-packages

See this document if you want a more sophisticated setup.

If you are testing, you'll want jq installed. curl and bzip2 are normally preinstalled, but if you are running in a docker container, you might have to install them.

sudo apt install curl bzip2 jq

Macos Notes

On macOS, you'll need to install realpath (from the coreutils package). If you are using Homebrew, you can use these commands to install all the needed tools:

brew install coreutils go jq nvm bash
nvm install node
npm install --location=global ganache

Set up development environment

Note: the scripts/install-monero-linux.sh script will download the monero binaries needed for you. You can invoke it directly, but the next script below will run it if there is no symbolic link named monero-bin to a monero installation in the project's root directory.

Use this command to launch ganache, an ethereum simulator, and monerod in regtest mode. "regtest" mode is stand-alone (non-networked) mode of monerod for testing purposes. Warning: the command below will kill running instances of ganache, monerod, monero-wallet-rpc or swapd.

./scripts/setup-env.sh

To avoid confusion, delete any data directories from old runs of swapd that used the flags --dev-xmrtaker or --dev-xmrmaker:

rm -rf "${TMPDIR:-/tmp}"/xmr[mt]aker-*

Build the Executables

You have several options. If you are looking to do production swaps, use one of the first two release options. All 3 options create swapd and swapcli binaries in the bin directory at the top of the project.

Build the most recent tagged release using Go

make build-release

Build the most recent tagged release using docker (Go not required)

make build-release-in-docker

Build the checked-out sources as-is

make build

Launch Alice and Bob's swapd Instances

To launch Alice's swapd instance, use this command:

./bin/swapd --dev-xmrtaker --deploy &> alice.log &

We are going to use Alice's instance as a bootnode for Bob's instance. To configure this, we need one of the multi-addresses that Alice is listening on. Alice will be listing both on a TCP port and a UDP/QUIC port, it doesn't matter which one you pick. Use this command to list Alice's listening libp2p multi-addresses:

./bin/swapcli addresses

Assign the value you picked to a variable. Your value will be different, this is just an example below:

BOOT_NODE=/ip4/127.0.0.1/udp/9933/quic-v1/p2p/12D3KooWHRi24PVZ6TBnQJHdVyewDRcKFZtYV3qmB4KQo8iMyqik

Now get the ethereum contract address that Alice deployed to. This can be pulled from the Alice's logs, or from a version RPC request.

CONTRACT_ADDR=$(./bin/swapcli version | grep '^swap creator address' | sed 's/.*: //')

Now start Bob's swapd instance:

./bin/swapd --dev-xmrmaker --bootnodes "${BOOT_NODE}" --contract-address "${CONTRACT_ADDR}" &> bob.log &

Using swapcli To Check Balances

swapcli is an executable to interact with a swapd instance via it's RPC port on the local host (127.0.0.1). The current security model of swapd assumes connections originating from the local host are authorized, so you should not run swapd for production swaps on multi-user hosts or hosts with malicious software running on them.

Note: when using the --dev-xmrtaker and --dev-xmrmaker flags, Alice's RPC server runs on http://localhost:5000 (the default port) and Bob's runs on http://localhost:5001. Since Bob's swapd RPC port is not the default, you will need to pass --swapd-port 5001 to swapcli when interacting with his daemon.

Alice and Bob are both using Ethereum wallet keys that are prefunded by Ganache. Background Monero mining was started for Bob, because his swapd instance used the --dev-xmrmaker flag.

You can check Alice's balance with this command:

./bin/swapcli balances

And Bob's balances with this command:

./bin/swapcli balances --swapd-port 5001

If Bob doesn't have enough balance, you can mine more blocks using:

source scripts/testlib.sh
mine-monero-for-swapd 5001

Make a Swap Offer

Next we need Bob to make an offer and advertise it, so that Alice can take it. You will get notified when the swap is taken. This command will block waiting for update messages, so you will need to dedicate a separate terminal for it:

./bin/swapcli make --min-amount 0.1 --max-amount 1 --exchange-rate 0.05 --swapd-port 5001

Example output:

Published:
	Offer ID:  0x09dd41c7b8620cdc3716463dc947a11edf3af45ff07c8b0ff89dd23592e732ca
	Peer ID:   12D3KooWK7989g6xmAaEsKFPuZTj2CVknRxQuk7dFL55CC1rpEWW
	Taker Min: 0.005 ETH
	Taker Max: 0.05 ETH
> Stage updated: KeysExchanged
> Stage updated: XMRLocked
> Stage updated: Success

Alternatively, you can make the offer without subscribing to swap updates:

./bin/swapcli make --min-amount 0.1 --max-amount 1 --exchange-rate 0.05 --swapd-port 5001 --detached

Discover Swap Offers

Now, Alice can discover peers who have advertised offers.

./bin/swapcli discover --provides XMR --search-time 3
Peer 0: 12D3KooWAE3zH374qcxyFCA8B5g1uMqhgeiHoXT5KKD6A54SGGsp

Query the returned peer to find the range of XMR they are willing to swap and at what exchange rate. Note: You need to update the peer ID below with the one from your output in the previous step.

./bin/swapcli query --peer-id 12D3KooWAE3zH374qcxyFCA8B5g1uMqhgeiHoXT5KKD6A54SGGsp
Offer ID: 0xcc57d3d1b9d8186118f1f1581a8dc4dca0e5aa6c39a5255bd0c2ebb824cfe2eb
Provides: XMR
Min Amount: 0.1
Max Amount: 1
Exchange Rate: 0.05
ETH Asset: ETH

Take a Swap Offers

Alice now has the information needed to start a swap with Bob. You'll need Bob's peer ID and his offer ID from the previous step to update the command below:

./bin/swapcli take \
  --peer-id 12D3KooWAE3zH374qcxyFCA8B5g1uMqhgeiHoXT5KKD6A54SGGsp \
  --offer-id 0xcc57d3d1b9d8186118f1f1581a8dc4dca0e5aa6c39a5255bd0c2ebb824cfe2eb \
  --provides-amount 0.05
Initiated swap with offer ID 0xcc57d3d1b9d8186118f1f1581a8dc4dca0e5aa6c39a5255bd0c2ebb824cfe2eb
> Stage updated: ExpectingKeys
> Stage updated: ETHLocked
> Stage updated: ContractReady
> Stage updated: Success

Alternatively, you can take the offer without subscribing to swap updates:

./bin/swapcli take \
  --peer-id 12D3KooWAE3zH374qcxyFCA8B5g1uMqhgeiHoXT5KKD6A54SGGsp \
  --offer-id 0xcc57d3d1b9d8186118f1f1581a8dc4dca0e5aa6c39a5255bd0c2ebb824cfe2eb \
  --provides-amount 0.05 --detached

If all goes well, you should see Alice and Bob successfully exchange messages and execute the swap protocol.

Other swapcli Commands

To query the information for an ongoing swap, you can run:

./bin/swapcli ongoing --offer-id <id>

To query information for a past swap using its ID, you can run:

./bin/swapcli past --offer-id <id>

For both of these commands, if no --offer-id is passed, all ongoing or past swaps will be returned.