Add generate block command

Author: benthecarman

client/src/client.rs

@@ -866,6 +866,13 @@ pub trait RpcApi: Sized {
         self.call("generate", &[block_num.into(), opt_into_json(maxtries)?])
     }
 
+    /// Mine a set of ordered transactions to a specified address
+    /// and return the block hash.
+    fn generate_block<R: RawTx>(&self, address: &Address, txs: &[R]) -> Result<json::GenerateBlockResult> {
+        let tx_strs: Vec<_> = txs.iter().map(|t| t.to_owned().raw_hex()).collect();
+        self.call("generateblock", &[address.to_string().into(), tx_strs.into()])
+    }
+
     /// Mark a block as invalid by `block_hash`
     fn invalidate_block(&self, block_hash: &bitcoin::BlockHash) -> Result<()> {
         self.call("invalidateblock", &[into_json(block_hash)?])

integration_test/src/main.rs

@@ -140,6 +140,7 @@ fn main() {
     test_generate(&cl);
     test_get_balance_generate_to_address(&cl);
     test_get_balances_generate_to_address(&cl);
+    test_generate_block(&cl);
     test_get_best_block_hash(&cl);
     test_get_block_count(&cl);
     test_get_block_hash(&cl);
@@ -277,6 +278,56 @@ fn test_get_balances_generate_to_address(cl: &Client) {
     }
 }
 
+fn test_generate_block(cl: &Client) {
+    let sk = PrivateKey {
+        network: Network::Regtest,
+        inner: secp256k1::SecretKey::new(&mut secp256k1::rand::thread_rng()),
+        compressed: true,
+    };
+    let addr = Address::p2wpkh(&sk.public_key(&SECP), Network::Regtest).unwrap();
+
+    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 tx = Transaction {
+        version: 1,
+        lock_time: PackedLockTime::ZERO,
+        input: vec![TxIn {
+            previous_output: OutPoint {
+                txid: unspent.txid,
+                vout: unspent.vout,
+            },
+            sequence: Sequence::MAX,
+            script_sig: Script::new(),
+            witness: Witness::new(),
+        }],
+        output: vec![TxOut {
+            value: (unspent.amount - *FEE).to_sat(),
+            script_pubkey: addr.script_pubkey(),
+        }],
+    };
+
+    let input = json::SignRawTransactionInput {
+        txid: unspent.txid,
+        vout: unspent.vout,
+        script_pub_key: unspent.script_pub_key,
+        redeem_script: None,
+        amount: Some(unspent.amount),
+    };
+    let res = cl.sign_raw_transaction_with_wallet(&tx, Some(&[input]), None).unwrap();
+    assert!(res.complete);
+
+    let result = cl
+        .generate_block(&cl.get_new_address(None, None).unwrap(), &[&res.transaction().unwrap()])
+        .unwrap();
+    let tip = cl.get_best_block_hash().unwrap();
+    assert_eq!(result.hash, tip);
+}
+
 fn test_get_best_block_hash(cl: &Client) {
     let _ = cl.get_best_block_hash().unwrap();
 }

json/src/lib.rs

@@ -988,6 +988,13 @@ pub struct GetAddressInfoResult {
     pub label: Option<String>,
 }
 
+/// Models the result of "generateblock"
+#[derive(Clone, Debug, Deserialize, Serialize)]
+pub struct GenerateBlockResult {
+    /// Hash of the block generated
+    pub hash: bitcoin::BlockHash,
+}
+
 /// Models the result of "getblockchaininfo"
 #[derive(Clone, Debug, Deserialize, Serialize)]
 pub struct GetBlockchainInfoResult {