Merge #265: Add create_psbt

6bfbda2 createpsbt (thesimplekid)

Pull request description:

ACKs for top commit:
  apoelstra:
    ACK 6bfbda2

Tree-SHA512: a4f83f5d79120011c96cc275c5fc81a26b90cb2c724eba92a86302683280c2a6bc922ab1a70d905c957cef150623c915c1f813415bd8145f3a0fe44596729b60

Author: apoelstra

client/src/client.rs

@@ -725,6 +725,27 @@ pub trait RpcApi: Sized {
         self.call("listreceivedbyaddress", handle_defaults(&mut args, &defaults))
     }
 
+    fn create_psbt(
+        &self,
+        inputs: &[json::CreateRawTransactionInput],
+        outputs: &HashMap<String, Amount>,
+        locktime: Option<i64>,
+        replaceable: Option<bool>,
+    ) -> Result<String> {
+        let outs_converted = serde_json::Map::from_iter(
+            outputs.iter().map(|(k, v)| (k.clone(), serde_json::Value::from(v.to_btc()))),
+        );
+        self.call(
+            "createpsbt",
+            &[
+                into_json(inputs)?,
+                into_json(outs_converted)?,
+                into_json(locktime)?,
+                into_json(replaceable)?,
+            ],
+        )
+    }
+
     fn create_raw_transaction_hex(
         &self,
         utxos: &[json::CreateRawTransactionInput],

integration_test/src/main.rs

@@ -175,6 +175,7 @@ fn main() {
     test_wallet_process_psbt(&cl);
     test_join_psbt(&cl);
     test_combine_psbt(&cl);
+    test_create_psbt(&cl);
     test_finalize_psbt(&cl);
     test_list_received_by_address(&cl);
     test_scantxoutset(&cl);
@@ -848,6 +849,25 @@ fn test_combine_psbt(cl: &Client) {
     assert!(!psbt.is_empty());
 }
 
+fn test_create_psbt(cl: &Client) {
+    let options = json::ListUnspentQueryOptions {
+        minimum_amount: Some(btc(2)),
+        ..Default::default()
+    };
+    let unspent = cl.list_unspent(Some(6), None, None, None, Some(options)).unwrap();
+    let unspent = unspent.into_iter().nth(0).unwrap();
+
+    let input = json::CreateRawTransactionInput {
+        txid: unspent.txid,
+        vout: unspent.vout,
+        sequence: None,
+    };
+    let mut output = HashMap::new();
+    output.insert(RANDOM_ADDRESS.to_string(), btc(1));
+
+    let _ = cl.create_psbt(&[input], &output, Some(500_000), Some(true)).unwrap();
+}
+
 fn test_finalize_psbt(cl: &Client) {
     let options = json::ListUnspentQueryOptions {
         minimum_amount: Some(btc(2)),