Merge bitcoindevkit/bdk-ffi#104: Add PSBT deserialize and serialize functions, remove details

c039281ffcbaab8048ff87426a413c953a1e5ece Add PSBT deserialize and serialize functions, remove details (Steve Myers)
1f0b053872889f5dff340035a9e3cd3488688152 Fix bin/generate with no features (Steve Myers)

Pull request description:

  1. Fix bin/generate with no features
  2. Add `PartiallySignedBitcoinTransaction::deserialize` function as named constructor to decode from a string per [BIP 0174]
  3. Add `PartiallySignedBitcoinTransaction::serialize` function to encode to a string per [BIP 0174]
  4. Remove `PartiallySignedBitcoinTransaction.details` struct field

  [BIP 0174]:https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki#encoding

  Fixes #103

Top commit has no ACKs.

Tree-SHA512: 0ba34d96625d71434d41573089a150d09fcfb6439648a7eed6e36dcdddd2682c969525b7c6efda898b2f979a7ca6ce51dc2158acf65da7f1f4c554d98b60f4ff

src/bdk.udl

@@ -131,6 +131,9 @@ interface Wallet {
 interface PartiallySignedBitcoinTransaction {
   [Throws=BdkError]
   constructor([ByRef] Wallet wallet, string recipient, u64 amount, float? fee_rate);
+  [Name=deserialize,Throws=BdkError]
+  constructor(string psbt_base64);
+  string serialize();
 };
 
 dictionary ExtendedKeyInfo {

src/bin/generate.rs

@@ -1,14 +1,13 @@
-use std::env;
-use std::fs;
-use std::io::Write;
-use std::path::Path;
+pub const BDK_UDL: &str = "src/bdk.udl";
 
-const BDK_UDL: &str = "src/bdk.udl";
-
-fn fixup_python_lib_path<O: AsRef<Path>>(
+#[cfg(feature = "generate-python")]
+fn fixup_python_lib_path<O: AsRef<std::path::Path>>(
     out_dir: O,
     lib_name: &str,
 ) -> Result<(), Box<dyn std::error::Error>> {
+    use std::fs;
+    use std::io::Write;
+
     const LOAD_INDIRECT_DEF: &str = "def loadIndirect():";
 
     let bindings_file = out_dir.as_ref().join("bdk.py");
@@ -40,10 +39,19 @@ def _loadIndirectOld():"#,
     Ok(())
 }
 
+#[cfg(feature = "generate-python")]
 fn generate_python() -> Result<(), Box<dyn std::error::Error>> {
+    use std::env;
+
     let out_path = env::var("GENERATE_PYTHON_BINDINGS_OUT")
         .map_err(|_| String::from("`GENERATE_PYTHON_BINDINGS_OUT` env variable missing"))?;
-    uniffi_bindgen::generate_bindings(&format!("{}/{}", env!("CARGO_MANIFEST_DIR"), BDK_UDL), None, vec!["python"], Some(&out_path), false)?;
+    uniffi_bindgen::generate_bindings(
+        &format!("{}/{}", env!("CARGO_MANIFEST_DIR"), BDK_UDL),
+        None,
+        vec!["python"],
+        Some(&out_path),
+        false,
+    )?;
 
     if let Some(name) = env::var("GENERATE_PYTHON_BINDINGS_FIXUP_LIB_PATH").ok() {
         fixup_python_lib_path(&out_path, &name)?;
@@ -53,5 +61,7 @@ fn generate_python() -> Result<(), Box<dyn std::error::Error>> {
 }
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
-    generate_python()
+    #[cfg(feature = "generate-python")]
+    generate_python()?;
+    Ok(())
 }

src/lib.rs

@@ -155,7 +155,6 @@ impl Progress for BdkProgressHolder {
 
 struct PartiallySignedBitcoinTransaction {
     internal: Mutex<PartiallySignedTransaction>,
-    details: bdk::TransactionDetails,
 }
 
 impl PartiallySignedBitcoinTransaction {
@@ -168,7 +167,7 @@ impl PartiallySignedBitcoinTransaction {
         let wallet = wallet.get_wallet();
         match Address::from_str(&recipient) {
             Ok(address) => {
-                let (psbt, details) = {
+                let (psbt, _details) = {
                     let mut builder = wallet.build_tx();
                     builder.add_recipient(address.script_pubkey(), amount);
                     if let Some(sat_per_vb) = fee_rate {
@@ -178,7 +177,6 @@ impl PartiallySignedBitcoinTransaction {
                 };
                 Ok(PartiallySignedBitcoinTransaction {
                     internal: Mutex::new(psbt),
-                    details,
                 })
             }
             Err(..) => Err(BdkError::Generic(
@@ -186,6 +184,18 @@ impl PartiallySignedBitcoinTransaction {
             )),
         }
     }
+
+    pub fn deserialize(psbt_base64: String) -> Result<Self, Error> {
+        let psbt: PartiallySignedTransaction = PartiallySignedTransaction::from_str(&psbt_base64)?;
+        Ok(PartiallySignedBitcoinTransaction {
+            internal: Mutex::new(psbt),
+        })
+    }
+
+    pub fn serialize(&self) -> String {
+        let psbt = self.internal.lock().unwrap().clone();
+        psbt.to_string()
+    }
 }
 
 impl WalletHolder<AnyBlockchain> for Wallet {
@@ -254,13 +264,11 @@ impl Wallet {
             .sync(BdkProgressHolder { progress_update }, max_address_param)
     }
 
-    fn broadcast(
-        &self,
-        psbt: &PartiallySignedBitcoinTransaction,
-    ) -> Result<Transaction, Error> {
+    fn broadcast(&self, psbt: &PartiallySignedBitcoinTransaction) -> Result<Transaction, Error> {
         let tx = psbt.internal.lock().unwrap().clone().extract_tx();
         self.get_wallet().broadcast(&tx)?;
-        Ok(Transaction::from(&psbt.details))
+        let tx_details = self.get_wallet().get_tx(&tx.txid(), true)?;
+        Ok(Transaction::from(&tx_details.unwrap()))
     }
 }