⚡️ Speed up method DigitalBitboxPlugin.get_client by 16%

[codeflash-ai]

📄 16% (0.16x) speedup for DigitalBitboxPlugin.get_client in electrum/plugins/digitalbitbox/digitalbitbox.py

⏱️ Runtime : 469 microseconds → 404 microseconds (best of 58 runs)

📝 Explanation and details

The optimization caches the device manager reference during initialization instead of calling the device_manager() method on every get_client() invocation.

Key Changes:

• Added self._device_manager = self.parent.device_manager in HW_PluginBase.__init__()
• Changed devmgr = self.device_manager() to devmgr = self._device_manager in get_client()

Why This Speeds Up Performance:
The original code called self.device_manager() method every time get_client() was invoked. Method calls in Python have overhead due to:

1. Method resolution through the MRO (Method Resolution Order)
2. Function call setup and teardown
3. Potential property getter execution

By caching self.parent.device_manager as a direct attribute during initialization, the hot path in get_client() becomes a simple attribute lookup instead of a method call, which is significantly faster in Python.

Performance Impact:
The line profiler shows the device_manager() call took 24.8% of execution time in the original version, reduced to just 10% for the equivalent line in the optimized version. This represents the primary bottleneck that was eliminated.

Test Results Analysis:
All test cases show consistent 5-16% speedups, with the largest improvements (12-16%) occurring in scenarios with multiple calls to get_client(), validating that this optimization is most beneficial when the method is called repeatedly - exactly the use case this caching strategy targets.

The optimization maintains identical behavior while eliminating unnecessary method call overhead on every invocation of a frequently-used hardware wallet function.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 313 Passed
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	🔘 None Found
📊 Tests Coverage	100.0%

🌀 Generated Regression Tests and Runtime

import pytest
from electrum.plugins.digitalbitbox.digitalbitbox import DigitalBitboxPlugin

# --- Minimal stubs for dependencies ---

class HardwareClientBase:
    def __init__(self, keystore, plugin):
        self.keystore = keystore
        self.plugin = plugin
        self.checked = False

    def check_device_dialog(self):
        # Simulate a dialog check
        self.checked = True

class Device:
    pass

class DeviceMgr:
    def __init__(self):
        self.last_args = None
        self.client_return = None
        self.raise_exception = False

    def client_for_keystore(self, plugin, handler, keystore, force_pair, devices=None, allow_user_interaction=True):
        self.last_args = (plugin, handler, keystore, force_pair, devices, allow_user_interaction)
        if self.raise_exception:
            raise RuntimeError("Device manager error")
        return self.client_return

    def register_devices(self, device_ids, plugin=None):
        self.registered = (device_ids, plugin)

class Handler:
    pass

class Hardware_KeyStore:
    def __init__(self, handler=None):
        self.handler = handler

class DigitalBitbox_KeyStore(Hardware_KeyStore):
    pass

class SimpleConfig(dict):
    def get(self, key, default=None):
        return super().get(key, default)
from electrum.plugins.digitalbitbox.digitalbitbox import DigitalBitboxPlugin

# --- Parent stub for plugin ---

class ParentStub:
    def __init__(self, device_manager):
        self.device_manager = device_manager

# --- Fixtures ---

@pytest.fixture
def device_mgr():
    return DeviceMgr()

@pytest.fixture
def parent(device_mgr):
    return ParentStub(device_mgr)

@pytest.fixture
def config():
    # Simulate config with a digitalbitbox section
    return SimpleConfig({'digitalbitbox': {'foo': 'bar'}})

@pytest.fixture
def plugin(parent, config):
    # Use a unique name for each plugin instance
    return DigitalBitboxPlugin(parent, config, name="digitalbitbox")

@pytest.fixture
def keystore():
    # Handler is required for the plugin
    return DigitalBitbox_KeyStore(handler=Handler())

@pytest.fixture
def client(plugin, keystore, device_mgr):
    # Setup device_mgr to return a HardwareClientBase for the keystore
    client = HardwareClientBase(keystore, plugin)
    device_mgr.client_return = client
    return client

# --- Basic Test Cases ---

def test_get_client_returns_client_and_checks_dialog(plugin, keystore, device_mgr):
    """Test that get_client returns the correct client and calls check_device_dialog."""
    expected_client = HardwareClientBase(keystore, plugin)
    device_mgr.client_return = expected_client
    codeflash_output = plugin.get_client(keystore); result = codeflash_output # 2.46μs -> 2.33μs (5.45% faster)

def test_get_client_returns_none_if_no_client(plugin, keystore, device_mgr):
    """Test that get_client returns None if device manager returns None."""
    device_mgr.client_return = None
    codeflash_output = plugin.get_client(keystore); result = codeflash_output # 1.91μs -> 1.66μs (14.5% faster)

def test_get_client_passes_devices_and_interaction(plugin, keystore, device_mgr):
    """Test that get_client passes devices and allow_user_interaction correctly."""
    device = Device()
    device_mgr.client_return = HardwareClientBase(keystore, plugin)
    plugin.get_client(keystore, devices=[device], allow_user_interaction=False) # 2.14μs -> 1.96μs (9.20% faster)
    args = device_mgr.last_args

def test_get_client_force_pair_false(plugin, keystore, device_mgr):
    """Test force_pair argument is passed through."""
    device_mgr.client_return = HardwareClientBase(keystore, plugin)
    plugin.get_client(keystore, force_pair=False) # 2.24μs -> 2.06μs (8.33% faster)
    args = device_mgr.last_args

# --- Edge Test Cases ---

def test_get_client_with_no_handler(plugin, device_mgr):
    """Test that get_client works when keystore.handler is None."""
    keystore = DigitalBitbox_KeyStore(handler=None)
    device_mgr.client_return = HardwareClientBase(keystore, plugin)
    codeflash_output = plugin.get_client(keystore); result = codeflash_output # 2.03μs -> 1.84μs (10.2% faster)

def test_get_client_with_empty_devices(plugin, keystore, device_mgr):
    """Test that get_client works with empty devices list."""
    device_mgr.client_return = HardwareClientBase(keystore, plugin)
    codeflash_output = plugin.get_client(keystore, devices=[]); result = codeflash_output # 2.14μs -> 1.98μs (8.13% faster)
    args = device_mgr.last_args

def test_get_client_with_large_devices(plugin, keystore, device_mgr):
    """Test get_client with a large devices list (edge of allowed scale)."""
    devices = [Device() for _ in range(999)]
    device_mgr.client_return = HardwareClientBase(keystore, plugin)
    codeflash_output = plugin.get_client(keystore, devices=devices); result = codeflash_output # 2.15μs -> 2.03μs (5.97% faster)
    args = device_mgr.last_args

def test_get_client_raises_device_manager_error(plugin, keystore, device_mgr):
    """Test that get_client propagates exceptions from device manager."""
    device_mgr.raise_exception = True
    with pytest.raises(RuntimeError, match="Device manager error"):
        plugin.get_client(keystore) # 2.35μs -> 2.07μs (13.3% faster)

def test_get_client_with_nonstandard_keystore(plugin, device_mgr):
    """Test get_client with a keystore not of DigitalBitbox_KeyStore type."""
    class OtherKeyStore(Hardware_KeyStore):
        pass
    keystore = OtherKeyStore(handler=Handler())
    device_mgr.client_return = HardwareClientBase(keystore, plugin=None)
    parent = ParentStub(device_mgr)
    plugin = DigitalBitboxPlugin(parent, SimpleConfig(), "digitalbitbox")
    codeflash_output = plugin.get_client(keystore); result = codeflash_output # 2.21μs -> 2.17μs (1.84% faster)

def test_plugin_initialization_registers_devices(device_mgr, config):
    """Test that plugin initialization registers devices if libraries_available is True."""
    parent = ParentStub(device_mgr)
    plugin = DigitalBitboxPlugin(parent, config, "digitalbitbox")

def test_plugin_initialization_no_register_if_library_unavailable(device_mgr, config):
    """Test that plugin initialization does not register devices if libraries_available is False."""
    parent = ParentStub(device_mgr)
    DigitalBitboxPlugin.libraries_available = False
    plugin = DigitalBitboxPlugin(parent, config, "digitalbitbox")
    DigitalBitboxPlugin.libraries_available = True  # Reset for other tests

def test_get_client_with_config_digitalbitbox_section(device_mgr):
    """Test plugin reads digitalbitbox section from config."""
    config = SimpleConfig({'digitalbitbox': {'foo': 'bar'}})
    parent = ParentStub(device_mgr)
    plugin = DigitalBitboxPlugin(parent, config, "digitalbitbox")

def test_get_client_with_config_no_digitalbitbox_section(device_mgr):
    """Test plugin sets digitalbitbox_config to {} if not in config."""
    config = SimpleConfig({})
    parent = ParentStub(device_mgr)
    plugin = DigitalBitboxPlugin(parent, config, "digitalbitbox")

# --- Large Scale Test Cases ---

def test_get_client_large_number_of_calls(plugin, keystore, device_mgr):
    """Test get_client is robust and deterministic under many calls."""
    device_mgr.client_return = HardwareClientBase(keystore, plugin)
    for i in range(100):  # 100 calls, well under the scale limit
        codeflash_output = plugin.get_client(keystore); result = codeflash_output # 65.2μs -> 57.9μs (12.6% faster)

def test_get_client_with_many_different_keystores(plugin, device_mgr):
    """Test get_client with many different keystore instances."""
    for i in range(100):  # 100 different keystores
        ks = DigitalBitbox_KeyStore(handler=Handler())
        device_mgr.client_return = HardwareClientBase(ks, plugin)
        codeflash_output = plugin.get_client(ks); result = codeflash_output # 65.3μs -> 57.9μs (12.9% faster)

def test_get_client_with_many_different_devices(plugin, keystore, device_mgr):
    """Test get_client with many different device lists."""
    for i in range(50):  # 50 different device lists
        devices = [Device() for _ in range(i)]
        device_mgr.client_return = HardwareClientBase(keystore, plugin)
        codeflash_output = plugin.get_client(keystore, devices=devices); result = codeflash_output # 35.9μs -> 32.6μs (10.4% faster)
        args = device_mgr.last_args

def test_get_client_deterministic_behavior(plugin, keystore, device_mgr):
    """Test get_client returns same result for same inputs."""
    device_mgr.client_return = HardwareClientBase(keystore, plugin)
    codeflash_output = plugin.get_client(keystore); result1 = codeflash_output # 1.68μs -> 1.51μs (11.3% faster)
    codeflash_output = plugin.get_client(keystore); result2 = codeflash_output # 986ns -> 879ns (12.2% faster)

def test_get_client_performance_large_devices(plugin, keystore, device_mgr):
    """Test get_client performance with a large devices list."""
    devices = [Device() for _ in range(999)]
    device_mgr.client_return = HardwareClientBase(keystore, plugin)
    codeflash_output = plugin.get_client(keystore, devices=devices); result = codeflash_output # 2.05μs -> 1.87μs (10.0% faster)
# codeflash_output is used to check that the output of the original code is the same as that of the optimized code.

import pytest
from electrum.plugins.digitalbitbox.digitalbitbox import DigitalBitboxPlugin

# --- Minimal stubs to allow DigitalBitboxPlugin.get_client to be tested in isolation ---

class DummyHandler:
    """Stub for keystore.handler, can be extended for edge testing."""
    pass

class DummyClient:
    """Stub for the Hardware wallet client, tracks dialog checks."""
    def __init__(self):
        self.dialog_checked = False
    def check_device_dialog(self):
        self.dialog_checked = True

class DummyDevice:
    """Stub for a hardware device."""
    pass

class DummyDeviceMgr:
    """Stub for DeviceMgr, returns a DummyClient and tracks calls."""
    def __init__(self):
        self.calls = []
        self.return_client = DummyClient()
    def client_for_keystore(self, plugin, handler, keystore, force_pair, devices=None, allow_user_interaction=True):
        # Record the call for inspection
        self.calls.append({
            'plugin': plugin,
            'handler': handler,
            'keystore': keystore,
            'force_pair': force_pair,
            'devices': devices,
            'allow_user_interaction': allow_user_interaction
        })
        return self.return_client

class DummyParent:
    """Stub for parent, provides device_manager."""
    def __init__(self, devmgr):
        self.device_manager = devmgr

class DummyKeystore:
    """Stub for Hardware_KeyStore, provides handler."""
    def __init__(self, handler=None):
        self.handler = handler if handler is not None else DummyHandler()

class DummyConfig(dict):
    """Stub for config, acts like a dict."""
    def get(self, key, default=None):
        return super().get(key, default)

class DigitalBitbox_KeyStore(DummyKeystore):
    """Stub for DigitalBitbox_KeyStore."""
    pass
from electrum.plugins.digitalbitbox.digitalbitbox import DigitalBitboxPlugin

# --- Unit tests for DigitalBitboxPlugin.get_client ---

# 1. Basic Test Cases

To edit these changes git checkout codeflash/optimize-DigitalBitboxPlugin.get_client-mhxl5z5w and push.