Add monero-recovery command to print address + view/spend keys

This allows manual recovery of problems like https://github.com/comit-network/xmr-btc-swap/issues/537
Since we could not figure out what causes this issue, and it is most likely an upstream problem this is the best we can do so far to allow the user to manually interact with `monero-wallet-cli` or `monero-wallet-rpc`.

CHANGELOG.md

@@ -7,6 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- `monero-recovery` command that can be used to print the monero address, private spend and view key so one can manually recover instances where the `monero-wallet-rpc` does not pick up the Monero funds locked up by the ASB.
+  Related issue: https://github.com/comit-network/xmr-btc-swap/issues/537
+  The command takes the swap-id as parameter.
+  The swap has to be in a `BtcRedeemed` state.
+  Use `--help` for more details.
+
 ## [0.10.0] - 2021-10-15
 
 ### Removed

swap/src/bin/swap.rs

@@ -12,7 +12,7 @@
 #![forbid(unsafe_code)]
 #![allow(non_snake_case)]
 
-use anyhow::{Context, Result};
+use anyhow::{bail, Context, Result};
 use comfy_table::Table;
 use qrcode::render::unicode;
 use qrcode::QrCode;
@@ -417,6 +417,43 @@ async fn main() -> Result<()> {
             let wallet_export = bitcoin_wallet.wallet_export("cli").await?;
             println!("{}", wallet_export.to_string())
         }
+        Command::MoneroRecovery { swap_id } => {
+            let db = open_db(data_dir.join("sqlite")).await?;
+
+            let swap_state: BobState = db.get_state(swap_id).await?.try_into()?;
+
+            match swap_state {
+                BobState::Started { .. }
+                | BobState::SwapSetupCompleted(_)
+                | BobState::BtcLocked(_)
+                | BobState::XmrLockProofReceived { .. }
+                | BobState::XmrLocked(_)
+                | BobState::EncSigSent(_)
+                | BobState::CancelTimelockExpired(_)
+                | BobState::BtcCancelled(_)
+                | BobState::BtcRefunded(_)
+                | BobState::BtcPunished { .. }
+                | BobState::SafelyAborted
+                | BobState::XmrRedeemed { .. } => {
+                    bail!("Cannot print monero recovery information in state {}, only possible for BtcRedeemed", swap_state)
+                }
+                BobState::BtcRedeemed(state5) => {
+                    let (spend_key, view_key) = state5.xmr_keys();
+
+                    let address = monero::Address::standard(
+                        env_config.monero_network,
+                        monero::PublicKey::from_private_key(&spend_key),
+                        monero::PublicKey::from(view_key.public()),
+                    );
+                    tracing::info!("Wallet address: {}", address.to_string());
+
+                    let view_key = serde_json::to_string(&view_key)?;
+                    println!("View key: {}", view_key);
+
+                    println!("Spend key: {}", spend_key);
+                }
+            }
+        }
     };
     Ok(())
 }

swap/src/cli/command.rs

@@ -249,6 +249,15 @@ where
                 },
             }
         }
+        RawCommand::MoneroRecovery { swap_id } => Arguments {
+            env_config: env_config_from(is_testnet),
+            debug,
+            json,
+            data_dir: data::data_dir_from(data, is_testnet)?,
+            cmd: Command::MoneroRecovery {
+                swap_id: swap_id.swap_id,
+            },
+        },
     };
 
     Ok(ParseResult::Arguments(arguments))
@@ -303,6 +312,9 @@ pub enum Command {
         bitcoin_electrum_rpc_url: Url,
         bitcoin_target_block: usize,
     },
+    MoneroRecovery {
+        swap_id: Uuid,
+    },
 }
 
 #[derive(structopt::StructOpt, Debug)]
@@ -439,6 +451,13 @@ enum RawCommand {
         #[structopt(flatten)]
         bitcoin: Bitcoin,
     },
+    /// Prints Monero information related to the swap in case the generated
+    /// wallet fails to detect the funds. This can only be used for swaps
+    /// that are in a `btc is redeemed` state.
+    MoneroRecovery {
+        #[structopt(flatten)]
+        swap_id: SwapId,
+    },
 }
 
 #[derive(structopt::StructOpt, Debug)]