Commit Graph

742 Commits

Author SHA1 Message Date
Thomas Eizinger
52b9a78de2
Alice to validate Bob's PSBT for correctness
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.
2021-03-30 13:02:56 +11:00
Thomas Eizinger
8576894c10
Split bitcoin::Wallet functions into various impl blocks
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.
2021-03-30 13:02:55 +11:00
Thomas Eizinger
b9d8cbeaa2
Rename testutils to harness
This allows us to bring in a dependency named `testutils`.
2021-03-30 12:59:34 +11:00
Thomas Eizinger
11b45cd8c0
Move messages into protocol module
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.
2021-03-30 12:59:34 +11:00
Thomas Eizinger
e130448200
Make as many fields of Alice's states private as possible
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.
2021-03-30 12:59:34 +11:00
Thomas Eizinger
7f5715e147
Remove unnecessary serde implementations 2021-03-30 12:59:33 +11:00
Thomas Eizinger
c539465925
Make it possible to create random public keys
This is useful for tests.
2021-03-30 12:59:30 +11:00
rishflab
86f312e143 Safely abort swap if TxLock is not confirmed in a reasonable time
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.
2021-03-30 11:13:09 +11:00
Thomas Eizinger
01739eddb1
Introduce a more flexible transaction subscription system
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>
2021-03-30 10:29:19 +11:00
bors[bot]
6fb495b6ab
Merge #383 #385 #386
383: Improve resilience of balance assertions r=thomaseizinger a=thomaseizinger

The final commit is the relevant patch!

It sits on top of several refactoring commits that happened while I was debugging why things didn't work as expected. Turned out to be reasonably useful so I just left them in :)

385: Bump anyhow from 1.0.39 to 1.0.40 r=thomaseizinger a=dependabot[bot]

Bumps [anyhow](https://github.com/dtolnay/anyhow) from 1.0.39 to 1.0.40.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/dtolnay/anyhow/releases">anyhow's releases</a>.</em></p>
<blockquote>
<h2>1.0.40</h2>
<ul>
<li>Reduce memory footprint of errors on Rust versions 1.51+ (<a href="https://github-redirect.dependabot.com/dtolnay/anyhow/issues/145">#145</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="704622f25d"><code>704622f</code></a> Release 1.0.40</li>
<li><a href="64ac0c00a9"><code>64ac0c0</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/dtolnay/anyhow/issues/145">#145</a> from dtolnay/addrof</li>
<li><a href="ef082670ea"><code>ef08267</code></a> Eliminate functionally duplicate vtable methods on rustc 1.51+</li>
<li><a href="1295b1fef9"><code>1295b1f</code></a> Add additional builds on 1.50 and 1.51 validating addr_of codepath</li>
<li><a href="be89adf403"><code>be89adf</code></a> Detect whether ptr::addr_of is supported by current compiler</li>
<li><a href="ac64560c42"><code>ac64560</code></a> Switch object_ref return from real ref to Ref ptr</li>
<li><a href="2987c9b59e"><code>2987c9b</code></a> Ignore redundant_else pedantic clippy lint</li>
<li><a href="827bb9d4c6"><code>827bb9d</code></a> Catch some warnings in addr_of-related codepaths</li>
<li><a href="ce0041866d"><code>ce00418</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/dtolnay/anyhow/issues/144">#144</a> from dtolnay/ptr</li>
<li><a href="3c32aa7dcd"><code>3c32aa7</code></a> Relax Sized bound on Own, Ref, Mut ptrs</li>
<li>Additional commits viewable in <a href="https://github.com/dtolnay/anyhow/compare/1.0.39...1.0.40">compare view</a></li>
</ul>
</details>
<br />


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386: Bump hyper from 0.14.4 to 0.14.5 r=thomaseizinger a=dependabot[bot]

Bumps [hyper](https://github.com/hyperium/hyper) from 0.14.4 to 0.14.5.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/hyperium/hyper/releases">hyper's releases</a>.</em></p>
<blockquote>
<h2>v0.14.5</h2>
<h2>Bug Fixes</h2>
<ul>
<li><strong>client:</strong> omit default port from automatic Host headers (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2441">#2441</a>) (<a href="0b11eee9bd">0b11eee9</a>)</li>
<li><strong>headers:</strong> Support multiple Content-Length values on same line (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2471">#2471</a>) (<a href="48fdaf1606">48fdaf16</a>, closes <a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2470">#2470</a>)</li>
<li><strong>server:</strong> skip automatic Content-Length headers when not allowed (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2216">#2216</a>) (<a href="8cbf9527df">8cbf9527</a>, closes <a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2215">#2215</a>)</li>
</ul>
<h2>Features</h2>
<ul>
<li><strong>client:</strong> allow HTTP/0.9 responses behind a flag (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2473">#2473</a>) (<a href="68d4e4a3db">68d4e4a3</a>, closes <a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2468">#2468</a>)</li>
<li><strong>server:</strong> add <code>AddrIncoming::from_listener</code> constructor (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2439">#2439</a>) (<a href="4c946af49c">4c946af4</a>)</li>
</ul>
</blockquote>
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<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/hyperium/hyper/blob/master/CHANGELOG.md">hyper's changelog</a>.</em></p>
<blockquote>
<h3>v0.14.5 (2021-03-26)</h3>
<h4>Bug Fixes</h4>
<ul>
<li><strong>client:</strong> omit default port from automatic Host headers (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2441">#2441</a>) (<a href="0b11eee9bd">0b11eee9</a>)</li>
<li><strong>headers:</strong> Support multiple Content-Length values on same line (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2471">#2471</a>) (<a href="48fdaf1606">48fdaf16</a>, closes <a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2470">#2470</a>)</li>
<li><strong>server:</strong> skip automatic Content-Length headers when not allowed (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2216">#2216</a>) (<a href="8cbf9527df">8cbf9527</a>, closes <a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2215">#2215</a>)</li>
</ul>
<h4>Features</h4>
<ul>
<li><strong>client:</strong> allow HTTP/0.9 responses behind a flag (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2473">#2473</a>) (<a href="68d4e4a3db">68d4e4a3</a>, closes <a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2468">#2468</a>)</li>
<li><strong>server:</strong> add <code>AddrIncoming::from_listener</code> constructor (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2439">#2439</a>) (<a href="4c946af49c">4c946af4</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="98e7e0bd15"><code>98e7e0b</code></a> v0.14.5</li>
<li><a href="895e4cf3fb"><code>895e4cf</code></a> refactor(ffi): return null ptr instead of aborting in C API (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2478">#2478</a>)</li>
<li><a href="68d4e4a3db"><code>68d4e4a</code></a> feat(client): allow HTTP/0.9 responses behind a flag (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2473">#2473</a>)</li>
<li><a href="51ed71b0a6"><code>51ed71b</code></a> docs(client): use Method::POST to match the example in <a href="https://hyper.rs/guide">https://hyper.rs/guide</a>...</li>
<li><a href="41f99578a5"><code>41f9957</code></a> refactor(dependencies): update to socket2 v0.4.0 (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2472">#2472</a>)</li>
<li><a href="48fdaf1606"><code>48fdaf1</code></a> fix(headers): Support multiple Content-Length values on same line (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2471">#2471</a>)</li>
<li><a href="eb0e718696"><code>eb0e718</code></a> docs(body): add links to to_bytes and aggregate (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2464">#2464</a>)</li>
<li><a href="297a068454"><code>297a068</code></a> docs(examples): upgrade tokio version (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2456">#2456</a>)</li>
<li><a href="34085afef6"><code>34085af</code></a> docs(examples): use hyper v0.14 and full feature (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2451">#2451</a>)</li>
<li><a href="8cbf9527df"><code>8cbf952</code></a> fix(server): skip automatic Content-Length headers when not allowed (<a href="https://github-redirect.dependabot.com/hyperium/hyper/issues/2216">#2216</a>)</li>
<li>Additional commits viewable in <a href="https://github.com/hyperium/hyper/compare/v0.14.4...v0.14.5">compare view</a></li>
</ul>
</details>
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Co-authored-by: Thomas Eizinger <thomas@eizinger.io>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
2021-03-29 22:31:43 +00:00
bors[bot]
a18c071559
Merge #384
384: Include author information in the `--help` text r=thomaseizinger a=thomaseizinger



Co-authored-by: Thomas Eizinger <thomas@eizinger.io>
2021-03-29 22:20:48 +00:00
Thomas Eizinger
0a82ce989b
Improve resilience of balance assertions
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.
2021-03-29 12:15:52 +11:00
Thomas Eizinger
a4c70dfe94
Don't call as_ref() unless necessary 2021-03-29 12:15:52 +11:00
Thomas Eizinger
4ab7e83806
Make use of cargo tests scoped test output
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`.
2021-03-29 12:15:51 +11:00
Thomas Eizinger
908dae3442
Inline tracing initialization
This code snippet is so short, it might as well be inlined to give
the test more control over what it wants to log.
2021-03-29 12:15:51 +11:00
Thomas Eizinger
c01cccb288
Use tracing-log feature flag instead of manual initialization
This also formats `log` events more nicely. Instead of

```
Mar 29 09:46:16.775  INFO log: Found message after comparing 82 lines log.target="testcontainers::core::wait_for_message" log.module_path="testcontainers::core::wait_for_message" log.file="/home/thomas/.cargo/registry/src/github.com-1ecc6299db9ec823/testcontainers-0.12.0/src/core/wait_for_message.rs" log.line=35
```

We now have

```
Mar 29 09:57:15.860  INFO testcontainers::core::wait_for_message: Found message after comparing 81 lines
```
2021-03-29 12:15:50 +11:00
Thomas Eizinger
c5827f84ca
Refactor recursive function to loop
This should get rid of the ever-growing stack size issue.
2021-03-29 12:15:48 +11:00
Thomas Eizinger
fc175a3f53
De-couple state from Monero wallet 2021-03-29 12:15:12 +11:00
Thomas Eizinger
42b6368298
Use full-qualified path for tracing macros
Saves an import line and makes it clear that we are using tracing.
2021-03-29 12:14:19 +11:00
Thomas Eizinger
5616683d7d
Monero confirmations are a u64
Trying to deserialize the number as a u32 caused deserialization
errors.
2021-03-29 12:14:19 +11:00
Thomas Eizinger
1b63d5486d
Move tick to the beginning of the loop
This ensures that we always wait for the provided interval, even in
the case of a `continue` which happens if there is an error within
the RPC call.
2021-03-29 12:14:19 +11:00
Thomas Eizinger
393ed45b9e
Say who we are in the --help message
The message now says:

swap 0.3.0
The COMIT guys <hello@comit.network>
CLI for swapping BTC for XMR

USAGE:
    swap [FLAGS] [OPTIONS] <SUBCOMMAND>

...
2021-03-26 14:31:14 +11:00
Thomas Eizinger
39b27e37d8
Delete empty file 2021-03-26 14:31:04 +11:00
rishflab
a3e85526c6 Specify LANG env variable for monero wallet rpc for unix systems
By specifying the language we can look for a specific string to check if
 monero wallet rpc is ready
2021-03-25 19:52:43 +11:00
rishflab
bc902ea63a Use language agnostic heuristic to check if monero_wallet_rpc is ready
Our strategy of searching for a english string to determine if
monero_wallet_rpc is ready is not compatible with languages other than
english. Instead we assume the monero rpc is ready if it has stopped
writing to stdout. We make a json rpc request to confirm this. A better
solution would have been to configure the monero_wallet_rpc to always
output in english but there is not command line argument to configure
the language.

Closes #353.
2021-03-25 18:13:06 +11:00
bors[bot]
7397cb5990
Merge #359
359: Bump bdk from 0.4.0 to 0.5.0 r=thomaseizinger a=dependabot[bot]

Bumps [bdk](https://github.com/bitcoindevkit/bdk) from 0.4.0 to 0.5.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/bitcoindevkit/bdk/blob/master/CHANGELOG.md">bdk's changelog</a>.</em></p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="f7944e871b"><code>f7944e8</code></a> Bump version to 0.5.0</li>
<li><a href="2fea1761c1"><code>2fea176</code></a> Bump deps version</li>
<li><a href="fa27ae210f"><code>fa27ae2</code></a> Update version in lib.rs</li>
<li><a href="46fa41470e"><code>46fa414</code></a> Update CHANGELOG with the new release tag</li>
<li><a href="8ebe7f0ea5"><code>8ebe7f0</code></a> Merge commit 'refs/pull/308/head' of github.com:bitcoindevkit/bdk into releas...</li>
<li><a href="eb85390846"><code>eb85390</code></a> Merge commit 'refs/pull/309/head' of github.com:bitcoindevkit/bdk into releas...</li>
<li><a href="dc83db273a"><code>dc83db2</code></a> better derivation path building</li>
<li><a href="201bd6ee02"><code>201bd6e</code></a> better derivation path building</li>
<li><a href="396ffb42f9"><code>396ffb4</code></a> handle descriptor xkey origin</li>
<li><a href="9cf62ce874"><code>9cf62ce</code></a> [ci] Manually install libclang-common-10-dev to 'check-wasm' job</li>
<li>Additional commits viewable in <a href="https://github.com/bitcoindevkit/bdk/compare/v0.4.0...v0.5.0">compare view</a></li>
</ul>
</details>
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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Thomas Eizinger <thomas@eizinger.io>
2021-03-24 06:12:52 +00:00
bors[bot]
9c9b1e4f0c
Merge #370
370: No Bitcoin deposit for Alice r=da-kami a=da-kami

The message to deposit Bitcoin only applies to Bob, not Alice.
Alice does not require any initial Bitcoin.

Co-authored-by: Daniel Karzel <daniel@comit.network>
2021-03-24 05:03:19 +00:00
Thomas Eizinger
1057d115d1
Re-order bob::event_loop based on importance 2021-03-24 15:17:54 +11:00
Thomas Eizinger
638a169a04
Buffer transfer proof if we are not connected to Bob
The request-response behaviour that is used for sending the transfer
proof actually has a functionality for buffering a message if we
are currently not connected. However, the request-response behaviour
also emits a dial attempt and **drops** all buffered messages if this
dial attempt fails. For us, the dial attempt will very likely always
fail because Bob is very likely behind NAT and we have to wait for
him to reconnect to us.

To mitigate this, we build our own buffer within the EventLoop and
send transfer proofs as soon as we are connected again.

Resolves #348.
2021-03-24 15:17:54 +11:00
Thomas Eizinger
cde3f0f74a
Remove connection handling from swap execution
The swap should not be concerned with connection handling. This is
the responsibility of the overall application.

All but the execution-setup NetworkBehaviour are `request-response`
behaviours. These have built-in functionality to automatically emit
a dial attempt in case we are not connected at the time we want to
send a message. We remove all of the manual dialling code from the
swap in favor of this behaviour.

Additionally, we make sure to establish a connection as soon as the
EventLoop gets started. In case we ever loose the connection to Alice,
we try to re-establish it.
2021-03-24 15:17:54 +11:00
Daniel Karzel
1e2a3c2d32 No Bitcoin deposit for Alice
The message to deposit Bitcoin only applies to Bob, not Alice.
Alice does not require any initial Bitcoin.
2021-03-24 11:51:25 +11:00
Thomas Eizinger
804b34f6b0
Listen on all swarm events instead of just behaviour events 2021-03-24 11:39:41 +11:00
Thomas Eizinger
2200fce3f3
Pass Swarm into EventLoop
This reduces the amount of arguments we need to pass into the eventloop
at the expense of slightly more setup of the swarm.
2021-03-24 11:39:41 +11:00
Thomas Eizinger
2c9ab4f6eb
Improve code structure and error messages for running swaps
The quote message was repeated and we should set the overall
failure into a context to know what went wrong.
2021-03-24 11:39:41 +11:00
Thomas Eizinger
0c0a322a8f
Rename module to better represent what it contains
This module provides an implementation of the RequestResponseCodec
using a cbor serialization.
2021-03-24 11:39:40 +11:00
Thomas Eizinger
1de0b39b32
Unify encrypted-signature protocol to a single one 2021-03-24 11:39:40 +11:00
Thomas Eizinger
9979cc9f1f
Unify transfer-proof protocol to a single one
Previously, we had two implementations of this protocol. To reduce
code size, we make Alice and Bob use the same implementation.
2021-03-24 11:39:40 +11:00
Thomas Eizinger
9d0b9abde0
Introduce helper function for mapping RequestResponseEvent
Decomposing a RequestResponseEvent is quite verbose. We can introduce
a helper function that does the matching for us and delegates to
specific `From` implementations for the protocol specific bits.
2021-03-24 11:39:39 +11:00
Thomas Eizinger
73f30320a6
Seed should neither be Clone nor Copy
It is better to not copy around secret data within our process to
make heartbleed-like attacks harder.
2021-03-24 11:39:39 +11:00
Thomas Eizinger
96b2a76971
Take advantage of upgraded electrum-client dependency
The new version implements std::error::Error and fixes a bug that
allows us to use the default config again.
2021-03-23 14:57:27 +11:00
dependabot[bot]
7f6299075c
Bump bdk from 0.4.0 to 0.5.0
Bumps [bdk](https://github.com/bitcoindevkit/bdk) from 0.4.0 to 0.5.0.
- [Release notes](https://github.com/bitcoindevkit/bdk/releases)
- [Changelog](https://github.com/bitcoindevkit/bdk/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bitcoindevkit/bdk/compare/v0.4.0...v0.5.0)

Signed-off-by: dependabot[bot] <support@github.com>
2021-03-23 03:54:18 +00:00
bors[bot]
968502827a
Merge #339
339: Bump dependency versions r=thomaseizinger a=thomaseizinger

Otherwise it will take a long time for dependabot to update all of
these.

Co-authored-by: Thomas Eizinger <thomas@eizinger.io>
2021-03-23 00:09:49 +00:00
bors[bot]
097197783c
Merge #351
351: Show the actual BTC amount and fee to be swapped r=da-kami a=da-kami

We got user feedback, that it is confusing that the amount "found" in the wallet does not match the amount actually being swapped, thus with this PR we explicitly display the amount swapped and fees.

Co-authored-by: Daniel Karzel <daniel@comit.network>
2021-03-22 23:42:31 +00:00
bors[bot]
189a13c063
Merge #319
319: Alice sweeps refunded funds into default wallet r=da-kami a=da-kami

Alice's refund scenario starts with generating the temporary wallet
from keys to claim the XMR which results in Alice' unloading the wallet.
Alice then loads her original wallet to be able to handle more swaps.
Since Alice is in the role of the long running daemon handling concurrent
swaps, the operation to close, claim and re-open her default wallet must
be atomic.
This PR adds an additional step, that sweeps all the refunded XMR back into
the default wallet. In order to ensure that this is possible, Alice has to
ensure that the locked XMR got enough confirmations.
These changes allow us to assert Alice's balance after refunding.

Co-authored-by: Daniel Karzel <daniel@comit.network>
2021-03-22 05:12:49 +00:00
Daniel Karzel
62079fc342 Punish scenario falls back to refund or fails
If we enter a punish scenario we can be sure the punish timelock is expired.
Thus, we must be able to punish unless Bob published the refund transaction.
There is no benefit in racing punish against refund here, because we cannot recover from a punish tx failure anyway.

The logic was changed to:
Try to broadcast punish tx and await finality.
  If either punish broadcasting of finality fails, try to fetch the refund transaction.
    If it is available extract Bob's Monero key part and transition to refund.
    If refund tx is not available fail without a status update.

Note that we do not distinguish different errors upon failure of punish, because
we cannot recover anyway. If we fail to retrieve Bob's refund tx, we just exit without
a status update so punish can be retried by resuming the swap.
2021-03-22 16:10:01 +11:00
Thomas Eizinger
a228349d8b
Bump dependency versions
Otherwise it will take a long time for dependabot to update all of
these.
2021-03-22 14:48:39 +11:00
Daniel Karzel
668d34080d Show the actual BTC amount and fee to be swapped 2021-03-19 17:40:14 +11:00
Thomas Eizinger
f49f8977d3
Remove dead code 2021-03-18 18:09:30 +11:00
Daniel Karzel
396c4177a6 Alice sweeps refunded funds into default wallet
Since Alice's refund scenario starts with generating the temporary wallet
from keys to claim the XMR which results in Alice' unloading the wallet.
Alice then loads her original wallet to be able to handle more swaps.
Since Alice is in the role of the long running daemon handling concurrent
swaps, the operation to close, claim and re-open her default wallet must
be atomic.
This PR adds an additional step, that sweeps all the refunded XMR back into
the default wallet. In order to ensure that this is possible, Alice has to
ensure that the locked XMR got enough confirmations.
These changes allow us to assert Alice's balance after refunding.
2021-03-18 17:59:48 +11:00
Thomas Eizinger
16dfea035b
Simplify code within BobState::XmrLockProofReceived
To achieve this, we decompose `watch_for_locked_xmr` into two parts:

1. A non-self-consuming function to construct a `WatchRequest`
2. A state transition that can now consume `self` again because
it is only called once within the whole select! expression.

Ideally, we would move more logic onto this state transition (like
comparing the actual amounts and fail the transition if it is not
valid). Doing so would have an unfortunate side-effect: We would
always wait for the full confirmations before checking whether or
not we actually receive enough XMR.

This allows us to have state transitions that consume self.
2021-03-18 15:45:58 +11:00