qml: implement bip39 account detection

electrum/gui/qml/components/BIP39RecoveryDialog.qml

@@ -0,0 +1,142 @@
+import QtQuick 2.6
+import QtQuick.Layouts 1.0
+import QtQuick.Controls 2.3
+import QtQuick.Controls.Material 2.0
+
+import org.electrum 1.0
+
+import "controls"
+
+ElDialog {
+    id: dialog
+    title: qsTr("Detect BIP39 accounts")
+
+    property string seed
+    property string seedExtraWords
+    property string walletType
+
+    property string derivationPath
+    property string scriptType
+
+    z: 1 // raise z so it also covers wizard dialog
+
+    anchors.centerIn: parent
+
+    padding: 0
+
+    width: parent.width * 4/5
+    height: parent.height * 4/5
+
+    ColumnLayout {
+        id: rootLayout
+        width: parent.width
+        height: parent.height
+
+        InfoTextArea {
+            Layout.fillWidth: true
+            Layout.margins: constants.paddingMedium
+
+            text: bip39RecoveryListModel.state == Bip39RecoveryListModel.Scanning
+                ? qsTr('Scanning for accounts...')
+                : bip39RecoveryListModel.state == Bip39RecoveryListModel.Success
+                    ? listview.count > 0
+                        ? qsTr('Choose an account to restore.')
+                        : qsTr('No existing accounts found.')
+                    : bip39RecoveryListModel.state == Bip39RecoveryListModel.Failed
+                        ? qsTr('Recovery failed')
+                        : qsTr('Recovery cancelled')
+            iconStyle: bip39RecoveryListModel.state == Bip39RecoveryListModel.Scanning
+                ? InfoTextArea.IconStyle.Spinner
+                : bip39RecoveryListModel.state == Bip39RecoveryListModel.Success
+                    ? InfoTextArea.IconStyle.Info
+                    : InfoTextArea.IconStyle.Error
+        }
+
+        Frame {
+            id: accountsFrame
+            Layout.fillWidth: true
+            Layout.fillHeight: true
+            Layout.topMargin: constants.paddingLarge
+            Layout.bottomMargin: constants.paddingLarge
+            Layout.leftMargin: constants.paddingMedium
+            Layout.rightMargin: constants.paddingMedium
+
+            verticalPadding: 0
+            horizontalPadding: 0
+            background: PaneInsetBackground {}
+
+            ColumnLayout {
+                spacing: 0
+                anchors.fill: parent
+
+                ListView {
+                    id: listview
+                    Layout.preferredWidth: parent.width
+                    Layout.fillHeight: true
+                    clip: true
+                    model: bip39RecoveryListModel
+
+                    delegate: ItemDelegate {
+                        width: ListView.view.width
+                        height: itemLayout.height
+
+                        onClicked: {
+                            dialog.derivationPath = model.derivation_path
+                            dialog.scriptType = model.script_type
+                            dialog.doAccept()
+                        }
+
+                        GridLayout {
+                            id: itemLayout
+                            columns: 2
+                            rowSpacing: 0
+
+                            anchors {
+                                left: parent.left
+                                right: parent.right
+                                leftMargin: constants.paddingMedium
+                                rightMargin: constants.paddingMedium
+                            }
+
+                            Label {
+                                Layout.columnSpan: 2
+                                text: model.description
+                            }
+                            Label {
+                                text: qsTr('script type')
+                                color: Material.accentColor
+                            }
+                            Label {
+                                Layout.fillWidth: true
+                                text: model.script_type
+                            }
+                            Label {
+                                text: qsTr('derivation path')
+                                color: Material.accentColor
+                            }
+                            Label {
+                                Layout.fillWidth: true
+                                text: model.derivation_path
+                            }
+                            Item {
+                                Layout.columnSpan: 2
+                                Layout.preferredHeight: constants.paddingLarge
+                                Layout.preferredWidth: 1
+                            }
+                        }
+                    }
+
+                    ScrollIndicator.vertical: ScrollIndicator { }
+                }
+            }
+        }
+    }
+
+    Bip39RecoveryListModel {
+        id: bip39RecoveryListModel
+    }
+
+    Component.onCompleted: {
+        bip39RecoveryListModel.startScan(walletType, seed, seedExtraWords)
+    }
+}

electrum/gui/qml/components/wizard/WCBIP39Refine.qml

@@ -1,9 +1,11 @@
 import QtQuick 2.6
 import QtQuick.Layouts 1.0
 import QtQuick.Controls 2.1
+import QtQuick.Controls.Material 2.0
 
 import org.electrum 1.0
 
+import ".."
 import "../controls"
 
 WizardComponent {
@@ -86,10 +88,33 @@ WizardComponent {
             Label {
                 text: qsTr('Script type and Derivation path')
             }
-            Button {
+            Pane {
-                text: qsTr('Detect Existing Accounts')
+                Layout.alignment: Qt.AlignHCenter
-                enabled: false
+                padding: 0
                 visible: !isMultisig
+
+                FlatButton {
+                    text: qsTr('Detect Existing Accounts')
+                    onClicked: {
+                        var dialog = bip39recoveryDialog.createObject(mainLayout, {
+                            walletType: wizard_data['wallet_type'],
+                            seed: wizard_data['seed'],
+                            seedExtraWords: wizard_data['seed_extra_words']
+                        })
+                        dialog.accepted.connect(function () {
+                            // select matching script type button and set derivation path
+                            for (var i = 0; i < scripttypegroup.buttons.length; i++) {
+                                var btn = scripttypegroup.buttons[i]
+                                if (btn.visible && btn.scripttype == dialog.scriptType) {
+                                    btn.checked = true
+                                    derivationpathtext.text = dialog.derivationPath
+                                    return
+                                }
+                            }
+                        })
+                        dialog.open()
+                    }
+                }
             }
 
             Label {
@@ -157,6 +182,11 @@ WizardComponent {
         id: bitcoin
     }
 
+    Component {
+        id: bip39recoveryDialog
+        BIP39RecoveryDialog { }
+    }
+
     Component.onCompleted: {
         isMultisig = wizard_data['wallet_type'] == 'multisig'
         if (isMultisig) {

electrum/gui/qml/qeapp.py

@@ -40,6 +40,7 @@ from .qechanneldetails import QEChannelDetails
 from .qeswaphelper import QESwapHelper
 from .qewizard import QENewWalletWizard, QEServerConnectWizard
 from .qemodelfilter import QEFilterProxyModel
+from .qebip39recovery import QEBip39RecoveryListModel
 
 if TYPE_CHECKING:
     from electrum.simple_config import SimpleConfig
@@ -339,6 +340,7 @@ class ElectrumQmlApplication(QGuiApplication):
         qmlRegisterType(QETxRbfFeeBumper, 'org.electrum', 1, 0, 'TxRbfFeeBumper')
         qmlRegisterType(QETxCpfpFeeBumper, 'org.electrum', 1, 0, 'TxCpfpFeeBumper')
         qmlRegisterType(QETxCanceller, 'org.electrum', 1, 0, 'TxCanceller')
+        qmlRegisterType(QEBip39RecoveryListModel, 'org.electrum', 1, 0, 'Bip39RecoveryListModel')
 
         qmlRegisterUncreatableType(QEAmount, 'org.electrum', 1, 0, 'Amount', 'Amount can only be used as property')
         qmlRegisterUncreatableType(QENewWalletWizard, 'org.electrum', 1, 0, 'QNewWalletWizard', 'QNewWalletWizard can only be used as property')

electrum/gui/qml/qebip39recovery.py

@@ -0,0 +1,129 @@
+import asyncio
+import concurrent
+
+from PyQt5.QtCore import pyqtProperty, pyqtSignal, pyqtSlot
+from PyQt5.QtCore import Qt, QAbstractListModel, QModelIndex, Q_ENUMS
+
+from electrum import Network, keystore
+from electrum.bip32 import BIP32Node
+from electrum.bip39_recovery import account_discovery
+from electrum.logging import get_logger
+
+from .util import TaskThread
+
+class QEBip39RecoveryListModel(QAbstractListModel):
+    _logger = get_logger(__name__)
+
+    class State:
+        Idle = -1
+        Scanning = 0
+        Success = 1
+        Failed = 2
+        Cancelled = 3
+
+    Q_ENUMS(State)
+
+    recoveryFailed = pyqtSignal()
+    stateChanged = pyqtSignal()
+    # userinfoChanged = pyqtSignal()
+
+    # define listmodel rolemap
+    _ROLE_NAMES=('description', 'derivation_path', 'script_type')
+    _ROLE_KEYS = range(Qt.UserRole, Qt.UserRole + len(_ROLE_NAMES))
+    _ROLE_MAP  = dict(zip(_ROLE_KEYS, [bytearray(x.encode()) for x in _ROLE_NAMES]))
+
+    def __init__(self, config, parent=None):
+        super().__init__(parent)
+        self._accounts = []
+        self._thread = None
+        self._root_seed = None
+        self._state = QEBip39RecoveryListModel.State.Idle
+        # self._busy = False
+        # self._userinfo = ''
+
+    def rowCount(self, index):
+        return len(self._accounts)
+
+    def roleNames(self):
+        return self._ROLE_MAP
+
+    def data(self, index, role):
+        account = self._accounts[index.row()]
+        role_index = role - Qt.UserRole
+        value = account[self._ROLE_NAMES[role_index]]
+        if isinstance(value, (bool, list, int, str)) or value is None:
+            return value
+        return str(value)
+
+    def clear(self):
+        self.beginResetModel()
+        self._accounts = []
+        self.endResetModel()
+
+    # @pyqtProperty(str, notify=userinfoChanged)
+    # def userinfo(self):
+    #     return self._userinfo
+
+    @pyqtProperty(int, notify=stateChanged)
+    def state(self):
+        return self._state
+
+    @state.setter
+    def state(self, state: State):
+        if state != self._state:
+            self._state = state
+            self.stateChanged.emit()
+
+    @pyqtSlot(str, str)
+    @pyqtSlot(str, str, str)
+    def startScan(self, wallet_type: str, seed: str, seed_extra_words: str = None):
+        if not seed or not wallet_type:
+            return
+
+        assert wallet_type == 'standard'
+
+        self._root_seed = keystore.bip39_to_seed(seed, seed_extra_words)
+
+        self.clear()
+
+        self._thread = TaskThread(self)
+        network = Network.get_instance()
+        coro = account_discovery(network, self.get_account_xpub)
+        self.state = QEBip39RecoveryListModel.State.Scanning
+        fut = asyncio.run_coroutine_threadsafe(coro, network.asyncio_loop)
+        self._thread.add(
+            fut.result,
+            on_success=self.on_recovery_success,
+            on_error=self.on_recovery_error,
+            cancel=fut.cancel,
+        )
+
+    def addAccount(self, account):
+        self._logger.debug(f'addAccount {account!r}')
+        self.beginInsertRows(QModelIndex(), len(self._accounts), len(self._accounts))
+        self._accounts.append(account)
+        self.endInsertRows()
+
+    def on_recovery_success(self, accounts):
+        self.state = QEBip39RecoveryListModel.State.Success
+
+        for account in accounts:
+            self.addAccount(account)
+
+        self._thread.stop()
+
+    def on_recovery_error(self, exc_info):
+        e = exc_info[1]
+        if isinstance(e, concurrent.futures.CancelledError):
+            self.state = QEBip39RecoveryListModel.State.Cancelled
+            return
+        self._logger.error(f"recovery error", exc_info=exc_info)
+        self.state = QEBip39RecoveryListModel.State.Failed
+        self._thread.stop()
+
+    def get_account_xpub(self, account_path):
+        root_node = BIP32Node.from_rootseed(self._root_seed, xtype='standard')
+        account_node = root_node.subkey_at_private_derivation(account_path)
+        account_xpub = account_node.to_xpub()
+        return account_xpub
+

electrum/gui/qml/util.py

@@ -1,10 +1,16 @@
+import sys
+import queue
+
 from functools import wraps
 from time import time
+from typing import Callable, Optional, NamedTuple
 
-from PyQt5.QtCore import pyqtSignal
+from PyQt5.QtCore import pyqtSignal, QThread
 
+from electrum.logging import Logger
 from electrum.util import EventListener, event_listener
 
+
 class QtEventListener(EventListener):
 
     qt_callback_signal = pyqtSignal(tuple)
@@ -21,6 +27,7 @@ class QtEventListener(EventListener):
         func = args[0]
         return func(self, *args[1:])
 
+
 # decorator for members of the QtEventListener class
 def qt_event_listener(func):
     func = event_listener(func)
@@ -29,6 +36,7 @@ def qt_event_listener(func):
         self.qt_callback_signal.emit( (func,) + args)
     return decorator
 
+
 # return delay in msec when expiry time string should be updated
 # returns 0 when expired or expires > 1 day away (no updates needed)
 def status_update_timer_interval(exp):
@@ -47,3 +55,75 @@ def status_update_timer_interval(exp):
         interval = 1000 * 60 * 60
 
     return interval
+
+# TODO: copied from desktop client, this could be moved to a set of common code.
+class TaskThread(QThread, Logger):
+    '''Thread that runs background tasks.  Callbacks are guaranteed
+    to happen in the context of its parent.'''
+
+    class Task(NamedTuple):
+        task: Callable
+        cb_success: Optional[Callable]
+        cb_done: Optional[Callable]
+        cb_error: Optional[Callable]
+        cancel: Optional[Callable] = None
+
+    doneSig = pyqtSignal(object, object, object)
+
+    def __init__(self, parent, on_error=None):
+        QThread.__init__(self, parent)
+        Logger.__init__(self)
+        self.on_error = on_error
+        self.tasks = queue.Queue()
+        self._cur_task = None  # type: Optional[TaskThread.Task]
+        self._stopping = False
+        self.doneSig.connect(self.on_done)
+        self.start()
+
+    def add(self, task, on_success=None, on_done=None, on_error=None, *, cancel=None):
+        if self._stopping:
+            self.logger.warning(f"stopping or already stopped but tried to add new task.")
+            return
+        on_error = on_error or self.on_error
+        task_ = TaskThread.Task(task, on_success, on_done, on_error, cancel=cancel)
+        self.tasks.put(task_)
+
+    def run(self):
+        while True:
+            if self._stopping:
+                break
+            task = self.tasks.get()  # type: TaskThread.Task
+            self._cur_task = task
+            if not task or self._stopping:
+                break
+            try:
+                result = task.task()
+                self.doneSig.emit(result, task.cb_done, task.cb_success)
+            except BaseException:
+                self.doneSig.emit(sys.exc_info(), task.cb_done, task.cb_error)
+
+    def on_done(self, result, cb_done, cb_result):
+        # This runs in the parent's thread.
+        if cb_done:
+            cb_done()
+        if cb_result:
+            cb_result(result)
+
+    def stop(self):
+        self._stopping = True
+        # try to cancel currently running task now.
+        # if the task does not implement "cancel", we will have to wait until it finishes.
+        task = self._cur_task
+        if task and task.cancel:
+            task.cancel()
+        # cancel the remaining tasks in the queue
+        while True:
+            try:
+                task = self.tasks.get_nowait()
+            except queue.Empty:
+                break
+            if task and task.cancel:
+                task.cancel()
+        self.tasks.put(None)  # in case the thread is still waiting on the queue
+        self.exit()
+        self.wait()