Support Bitcoin Core descriptor wallets (quick and dirty way)

Co-authored-by: laanwj <126646+laanwj@users.noreply.github.com>

Author: kristapsk

docs/USAGE.md

@@ -121,19 +121,11 @@ Make sure to follow the following step.
 With `bitcoind` running, do:
 
 ```
-bitcoin-cli -named createwallet wallet_name=jm_wallet descriptors=false
+bitcoin-cli -named createwallet wallet_name=jm_wallet disable_private_keys=true
 ```
 
-If this command fails with error `Unknown named parameter descriptors`, it means you run Bitcoin Core version older than v0.21. In that case do the following instead (but it's recommended to upgrade Bitcoin Core to more recent version):
-```
-bitcoin-cli createwallet "jm_wallet"
-```
-
-If this command fails with error `BDB wallet creation is deprecated and will be removed in a future release. In this release it can be re-enabled temporarily with the -deprecatedrpc=create_bdb setting.`, it means you run Bitcoin Core version v26 or newer. In that case you must add `deprecatedrpc=create_bdb` setting to your `bitcoin.conf`, restart Bitcoin Core and try again.
-
 The "jm_wallet" name is just an example. You can set any name. Alternative to this `bitcoin-cli` command: you can set a line with `wallet=..` in your
-`bitcoin.conf` before starting Core (see the Bitcoin Core documentation for details). At the moment, only legacy wallets (`descriptors=false`)
-work with Joinmarket. This means that Bitcoin Core needs to have been built with legacy wallet (Berkeley DB) support.
+`bitcoin.conf` before starting Core (see the Bitcoin Core documentation for details).
 
 After you create the wallet in the Bitcoin Core, you should set it in the `joinmarket.cfg`:
 

src/jmclient/blockchaininterface.py

@@ -356,14 +356,11 @@ def __init__(self, jsonRpc: JsonRpc, network: str, wallet_name: str) -> None:
                 log.info("Loading Bitcoin RPC wallet " + wallet_name + "...")
                 self._rpc("loadwallet", [wallet_name])
                 log.info("Done.")
-            # We only support legacy wallets currently
+            # We need to know is this legacy or descriptors wallet because there
+            # will be different RPC calls needed for address import.
             wallet_info = self._getwalletinfo()
-            if "descriptors" in wallet_info and wallet_info["descriptors"]:
-                raise Exception(
-                    "JoinMarket currently does not support Bitcoin Core "
-                    "descriptor wallets, use legacy wallet (rpc_wallet_file "
-                    "setting in joinmarket.cfg) instead. See docs/USAGE.md "
-                    "for details.")
+            self.descriptors = ("descriptors" in wallet_info and
+                wallet_info["descriptors"])
 
     def is_address_imported(self, addr: str) -> bool:
         return len(self._rpc('getaddressinfo', [addr])['labels']) > 0
@@ -429,7 +426,8 @@ def _rpc(self, method: str, args: Union[dict, list] = []) -> Any:
         if method not in ['importaddress', 'walletpassphrase', 'getaccount',
                           'gettransaction', 'getrawtransaction', 'gettxout',
                           'importmulti', 'listtransactions', 'getblockcount',
-                          'scantxoutset', 'getblock', 'getblockhash']:
+                          'scantxoutset', 'getblock', 'getblockhash',
+                          'importdescriptors']:
             log.debug('rpc: ' + method + " " + str(args))
         try:
             res = self.jsonRpc.call(method, args)
@@ -457,15 +455,23 @@ def is_address_labeled(self, utxo: dict, walletname: str) -> bool:
     def import_addresses(self, addr_list: Iterable[str], wallet_name: str,
                          restart_cb: Callable[[str], None] = None) -> None:
         requests = []
-        for addr in addr_list:
-            requests.append({
-                "scriptPubKey": {"address": addr},
-                "timestamp": 0,
-                "label": wallet_name,
-                "watchonly": True
-            })
-
-        result = self._rpc('importmulti', [requests, {"rescan": False}])
+        if self.descriptors:
+            for addr in addr_list:
+                requests.append({
+                    "desc": btc.get_address_descriptor(addr),
+                    "timestamp": "now",
+                    "label": wallet_name
+                })
+            result = self._rpc('importdescriptors', [requests])
+        else:
+            for addr in addr_list:
+                requests.append({
+                    "scriptPubKey": {"address": addr},
+                    "timestamp": 0,
+                    "label": wallet_name,
+                    "watchonly": True
+                })
+            result = self._rpc('importmulti', [requests, {"rescan": False}])
 
         num_failed = 0
         for row in result: