feat(faucet): write foundation cash note to disk

sn_client/Cargo.toml

@@ -19,6 +19,14 @@ test-utils = ["sn_peers_acquisition", "lazy_static", "eyre"]
 websockets = ["sn_networking/websockets", "sn_protocol/websockets"]
 
 [dependencies]
+tokio = { version = "1.35.0", features = [
+    "io-util",
+    "macros",
+    "rt",
+    "sync",
+    "fs",
+    "time",
+] }
 bip39 = "2.0.0"
 curv = { version = "0.10.1", package = "sn_curv", default-features = false, features = [
     "num-bigint",
@@ -49,13 +57,6 @@ sn_transfers = { path = "../sn_transfers", version = "0.18.1" }
 tempfile = "3.6.0"
 thiserror = "1.0.23"
 tiny-keccak = "~2.0.2"
-tokio = { version = "1.35.0", features = [
-    "io-util",
-    "macros",
-    "rt",
-    "sync",
-    "time",
-] }
 tracing = { version = "~0.1.26" }
 xor_name = "5.0.0"
 sn_peers_acquisition = { path = "../sn_peers_acquisition", version = "0.2.12", optional = true }
@@ -89,3 +90,11 @@ console_error_panic_hook = "0.1.6"
 tracing-wasm = "0.2.1"
 wasmtimer = "0.2.0"
 web-sys = { version = "0.3.22", features = ["console"] }
+# no fs for tokio on wasm
+tokio = { version = "1.35.0", features = [
+    "io-util",
+    "macros",
+    "rt",
+    "sync",
+    "time",
+] }

sn_client/src/faucet.rs

@@ -8,6 +8,8 @@
 
 use crate::{wallet::send, Client, Error, Result};
 use sn_transfers::{load_genesis_wallet, HotWallet, NanoTokens, FOUNDATION_PK};
+#[cfg(not(target_arch = "wasm32"))]
+use tokio::fs;
 
 const INITIAL_FAUCET_BALANCE: NanoTokens = NanoTokens::from(900000000000000000);
 
@@ -92,6 +94,25 @@ pub async fn fund_faucet_from_genesis_wallet(
         println!(
             "Successfully verified the transfer from genesis to foundation on the second try."
         );
+
+        #[cfg(not(target_arch = "wasm32"))]
+        {
+            // write the foundation cashnote to disk
+            let root_dir = faucet_wallet.api().wallet_dir();
+
+            let foundation_cashnote_path = root_dir.join("foundation_cashnote.cash_note");
+
+            debug!("Writing cash note to: {foundation_cashnote_path:?}");
+            let hex = foundation_cashnote
+                .to_hex()
+                .map_err(|_| Error::GenesisDisbursement)?;
+
+            if let Err(error) = fs::write(foundation_cashnote_path, hex).await {
+                error!("Could not write the foundation cashnote to disk: {error}.");
+                return Err(Error::from(error));
+            }
+        }
+
         info!("Successfully verified the transfer from genesis to foundation on the second try.");
     }
 

sn_transfers/src/wallet/hot_wallet.rs

@@ -54,6 +54,10 @@ impl HotWallet {
         self.watchonly_wallet.api()
     }
 
+    pub fn root_dir(&self) -> &Path {
+        self.watchonly_wallet.api().wallet_dir()
+    }
+
     /// Stores the wallet to disk.
     /// This requires having exclusive access to the wallet to prevent concurrent processes from writing to it
     fn store(&self, exclusive_access: WalletExclusiveAccess) -> Result<()> {