scripts: update quick_start.py to work with 4.0.x internals

fixes #6453

electrum/scripts/quick_start.py

@@ -1,12 +1,19 @@
+#!/usr/bin/env python3
+
 import os
+import asyncio
 
 from electrum.simple_config import SimpleConfig
 from electrum import constants
 from electrum.daemon import Daemon
 from electrum.storage import WalletStorage
 from electrum.wallet import Wallet, create_new_wallet
+from electrum.wallet_db import WalletDB
 from electrum.commands import Commands
+from electrum.util import create_and_start_event_loop, log_exceptions
+
 
+loop, stopping_fut, loop_thread = create_and_start_event_loop()
 
 config = SimpleConfig({"testnet": True})  # to use ~/.electrum/testnet as datadir
 constants.set_testnet()  # to set testnet magic bytes
@@ -21,18 +28,20 @@ if not os.path.exists(wallet_path):
     create_new_wallet(path=wallet_path, config=config)
 
 # open wallet
-storage = WalletStorage(wallet_path)
-wallet = Wallet(storage, config=config)
+wallet = daemon.load_wallet(wallet_path, password=None, manual_upgrades=False)
 wallet.start_network(network)
 
 # you can use ~CLI commands by accessing command_runner
 command_runner = Commands(config=config, daemon=daemon, network=network)
-command_runner.wallet = wallet
-print("balance", command_runner.getbalance())
-print("addr",    command_runner.getunusedaddress())
-print("gettx",   command_runner.gettransaction("bd3a700b2822e10a034d110c11a596ee7481732533eb6aca7f9ca02911c70a4f"))
+print("balance", network.run_from_another_thread(command_runner.getbalance(wallet=wallet)))
+print("addr",    network.run_from_another_thread(command_runner.getunusedaddress(wallet=wallet)))
+print("gettx",   network.run_from_another_thread(
+    command_runner.gettransaction("bd3a700b2822e10a034d110c11a596ee7481732533eb6aca7f9ca02911c70a4f")))
+
 
 # but you might as well interact with the underlying methods directly
 print("balance", wallet.get_balance())
 print("addr",    wallet.get_unused_address())
 print("gettx",   network.run_from_another_thread(network.get_transaction("bd3a700b2822e10a034d110c11a596ee7481732533eb6aca7f9ca02911c70a4f")))
+
+stopping_fut.set_result(1)  # to stop event loop