We use the "precondition" feature of the `tokio::select!` macro to
avoid polling certain futures. In particular, we skip polling all
futures that - when resolved - require us to send a message to Alice.
This allows us to delay the ACKing of the encrypted signature up until
the swap has actually requested it.
Similarly, it allows us to wait for the ACK of the transfer proof within
the swap before continuing.
bmrng is a library providing a request-response channel that allows
the receiving end of the channel to send a response back to the sender.
This allows us to more accurately implement the functions on the
`EventLoopHandle`. In particular, we now _wait_ for the ACK of specific
messages from the other party before resolving the future.
For example, when sending the encrypted signature, the async function
on the `EventLoopHandle` does not resolve until we received the ACK
from the other party.
We also delete the `Channels` abstraction in favor of directly creating
bmrng channels. This allows us to directly control the channel buffer
which we set to 1 because we don't need more than that on Bob's side.
There is no point in first checking for the expired timelocks and
then constructing a `select!` that also watches for the timelock to
expiry.
We can simply only have the select! invocation to achieve the same
effect. In case the timelock is already expired, this future will
resolve immediately.
Normally, the polling order of `select!` is pseudo-random. We
configure it to be _biased_ here to make sure the futures are polled
in order.
The execution setup is our only libp2p protocol that doesn't have
a timeout built-in. Hence, if anything fails on Alice's side, we
would wait here forever.
Wrapping the future in a timeout ensures that we fail eventually
if this protocol doesn't succeed.
We don't need to hide the fields of this Behaviour as the only reason
for why this struct exists is because libp2p forces us to compose our
NetworkBehaviours into a new struct.
This allows loading the seller-peer-id from the database upon resuming a swap.
Thus, the parameters `--seller-peer-id` is removed for the `resume` command.
Other than the peer-id the multi address of a seller can change and thus is
still a parameter. This parameter might become optional once we add DHT support.
Awaiting the confirmations in an earlier state can cause trouble with resuming
swaps with short cancel expiries (test scenarios).
Since it is the responsibility of the refund state to ensure that the XMR can
be sweeped, we now ensure that the lock transaction has 10 confirmations before
refunding the XMR using generate_from_keys.
Sending the transfer transaction in a distinct state helps ensuring
that we do not send the Monero lock transaction twice in a restart
scenario.
Waiting for the first transaction confirmation in a separate state
helps ensuring that we send the transfer proof in a restart scenario.
Once we resume unfinished swaps upon startup we have to ensure that
it is safe for Alice to act.
If Bob has locked BTC it is only make sense for Alice to lock up the
XMR as long as no timelock has expired. Hence we abort if the BTC is
locked, but any timelock expired already.
393: Re-word changelog entry for bad readiness check of monero-wallet-rpc r=thomaseizinger a=thomaseizinger
Fix the formatting to be one line per sentence and re-word to focus on what didn't work for the user.
Co-authored-by: Thomas Eizinger <thomas@eizinger.io>
392: Bump monero from 0.11.1 to 0.11.2 r=thomaseizinger a=dependabot[bot]
Bumps [monero](https://github.com/monero-rs/monero-rs) from 0.11.1 to 0.11.2.
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<h2>0.11.2</h2>
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389: Bump bdk-testutils from 0.3.0 to 0.4.0 r=thomaseizinger a=dependabot[bot]
Bumps [bdk-testutils](https://github.com/bitcoindevkit/bdk) from 0.3.0 to 0.4.0.
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<p>The v0.4.0 release brings updated dependencies, more sanity checks and an overhauled API to build transactions.</p>
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<h3>Misc</h3>
<h4>Changed</h4>
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<li>Updated <code>electrum-client</code> to version <code>0.7</code></li>
</ul>
<h3>Wallet</h3>
<h4>Changed</h4>
<ul>
<li><code>FeeRate</code> constructors <code>from_sat_per_vb</code> and <code>default_min_relay_fee</code> are now <code>const</code> functions</li>
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<li><a href="fa2610538f"><code>fa26105</code></a> [policy] Remove the <code>TooManyItemsSelected</code> error</li>
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390: Bump monero from 0.10.0 to 0.11.1 r=thomaseizinger a=dependabot[bot]
Bumps [monero](https://github.com/monero-rs/monero-rs) from 0.10.0 to 0.11.1.
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<li>Add package metadata for <a href="https://docs.rs/monero">https://docs.rs/monero</a> to enable feature badges</li>
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<h2>0.11.0</h2>
<p><strong>Changelog</strong></p>
<ul>
<li>Add amount recovery for <code>OwnedTxOut</code> with <code>ViewPair</code> (<a href="https://github-redirect.dependabot.com/monero-rs/monero-rs/issues/7">#7</a>)</li>
<li>Use <code>thiserror</code> on all <code>Error</code> types in the library</li>
<li>Update <code>base58-monero</code> to <code>0.2.1</code> and upgrade all dependencies</li>
<li>Simplify <code>Encodable</code> and <code>Decodable</code> traits based on the work done in <a href="https://github.com/monero-rs/monero-rs/blob/HEAD/github.com/rust-bitcoin/rust-bitcoin"><code>rust-bitcoin/rust-bitcoin</code></a>, remove dependency <code>bytes</code></li>
<li>Add new feature <code>strict_encoding_support</code>, disable by default, which wraps some <code>Encodable</code> and <code>Decodable</code> types</li>
<li>Improve README and Rust documentation</li>
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In order for the re-construction of TxLock to be meaningful, we limit
`Message2` to the PSBT instead of the full struct. This is a breaking
change in the network layer.
The PSBT is valid if:
- It has at most two outputs (we allow a change output)
- One of the outputs pays the agreed upon amount to a shared output script
Resolves#260.
This allows us to construct instances of bitcoin::Wallet for test
purposes that use a different blockchain and database implementation.
We also parameterize the electrum-client to make it possible to
construct a bitcoin::Wallet for tests that doesn't have one. This
is necessary because the client validates the connection as it is
constructed and we don't want to provide an Electrum backend for
unit tests.
This allows us to remove all visibility modifiers from the message
fields because child modules (in this case {alice,bob}::state) can
always access private fields of structs.
It also moves the messages into a more natural place. Previously,
they were defined within the network layer even though they are
independent of the libp2p implementation.
To achieve this, we need to add some pure helpers to the state structs.
This has the added benefit that we can reduce the amount of code within
the swap function.
338: Timeout improvements r=rishflab a=rishflab
If TxLock does not confirm in a reasonable amount of time, Alice should
give up on the swap rather than waiting forever. Watching for TxLock in
the mempool is no longer required and causes unnecessary complexity.
What if Alice does not see the transaction in mempool but it is already
confirmed? She will abort the swap for no reason.
Co-authored-by: rishflab <rishflab@hotmail.com>
If TxLock does not confirm in a reasonable amount of time, Alice should
give up on the swap rather than waiting forever. Watching for TxLock in
the mempool is not required and it causes unnecessary complexity. What
if Alice does not see the transaction in mempool but it is already
confirmed? She will abort the swap for no reason.
361: Introduce a more flexible transaction subscription system r=rishflab a=thomaseizinger
TODO:
- [x] Make sure we unsubscribe once all receivers are gone. How do we handle repeated subscriptions?
Will squash the last 4 or 5 commits once approved
Co-authored-by: Thomas Eizinger <thomas@eizinger.io>
Instead of watching for status changes directly on bitcoin::Wallet,
we return a Subscription object back to the caller. This subscription
object can be re-used multiple times.
Among other things, this now allows callers of `broadcast` to decide
on what to wait for given the returned Subscription object.
The new API is also more concise which allows us to remove some of
the functions on the actor states in favor of simple inline calls.
Co-authored-by: rishflab <rishflab@hotmail.com>
Sometimes, a single sync is not enough because we are still waiting
for the block to be mined.
We introduce an abstraction that loops on fetching the latest balance
with a certain timeout for asserting the balance.
By using `test_writer`, cargo can automatically scope the output
of the test to the relevant thread and will also only output it
if the test fails or is run with `--nocapture`.
