src/apps/debug: simplify debuglink, add more decision/state fields

- move data exported over debuglink into apps.debug
- move debug signals into apps.debug
- make pin/mnemonic dialogs testable
- streamline code style of apps.management.reset_device
- check __debug__ when debug app starts

src/apps/common/confirm.py

@@ -1,13 +1,7 @@
-from trezor import loop, ui, wire
+from trezor import ui, wire
 from trezor.messages import ButtonRequestType, FailureType, wire_types
 from trezor.messages.ButtonRequest import ButtonRequest
 from trezor.ui.confirm import CONFIRMED, ConfirmDialog, HoldToConfirmDialog
-from apps.common import cache
-
-# used to confirm/cancel the dialogs from outside of this module (i.e.
-# through debug link)
-if __debug__:
-    signal = cache.memory.setdefault('confirm_signal', loop.signal())
 
 
 @ui.layout
@@ -18,11 +12,7 @@ async def confirm(ctx, content, code=None, *args, **kwargs):
 
     dialog = ConfirmDialog(content, *args, **kwargs)
 
-    if __debug__:
-        waiter = ctx.wait(signal, dialog)
-    else:
-        waiter = ctx.wait(dialog)
-    return await waiter == CONFIRMED
+    return await ctx.wait(dialog) == CONFIRMED
 
 
 @ui.layout
@@ -33,11 +23,7 @@ async def hold_to_confirm(ctx, content, code=None, *args, **kwargs):
 
     dialog = HoldToConfirmDialog(content, 'Hold to confirm', *args, **kwargs)
 
-    if __debug__:
-        waiter = ctx.wait(signal, dialog)
-    else:
-        waiter = ctx.wait(dialog)
-    return await waiter == CONFIRMED
+    return await ctx.wait(dialog) == CONFIRMED
 
 
 async def require_confirm(*args, **kwargs):

src/apps/common/request_pin.py

@@ -1,8 +1,11 @@
-from trezor import res, ui
+from trezor import loop, res, ui
 from trezor.messages import PinMatrixRequestType
 from trezor.ui.confirm import CONFIRMED, ConfirmDialog
 from trezor.ui.pin import PinMatrix
 
+if __debug__:
+    from apps.debug import input_signal
+
 
 class PinCancelled(Exception):
     pass
@@ -42,13 +45,18 @@ async def request_pin(code=None, cancellable: bool=True) -> str:
     matrix.onchange()
 
     while True:
-        result = await dialog
+        if __debug__:
+            result = await loop.wait(dialog, input_signal)
+            if isinstance(result, str):
+                return result
+        else:
+            result = await dialog
         if result == CONFIRMED:
             return matrix.pin
-        elif result != CONFIRMED and matrix.pin:
+        elif matrix.pin:  # reset
             matrix.change('')
             continue
-        else:
+        else:  # cancel
             raise PinCancelled()
 
 

src/apps/debug/__init__.py

@@ -1,69 +1,42 @@
-import micropython
-import gc
-from uctypes import bytes_at, bytearray_at
-
-from trezor import loop
-from trezor.wire import register, protobuf_workflow
-from trezor.messages.wire_types import \
-    DebugLinkDecision, DebugLinkGetState, DebugLinkStop, \
-    DebugLinkMemoryRead, DebugLinkMemoryWrite, DebugLinkFlashErase
-from trezor.messages.DebugLinkMemory import DebugLinkMemory
+from trezor import loop, utils
+from trezor.messages import wire_types
 from trezor.messages.DebugLinkState import DebugLinkState
-from trezor.ui.confirm import CONFIRMED, CANCELLED
-
-from apps.common.confirm import signal
+from trezor.ui import confirm, swipe
+from trezor.wire import register, protobuf_workflow
 from apps.common import storage
-from apps.management import reset_device
+
+if not __debug__:
+    utils.halt("debug mode inactive")
+
+reset_internal_entropy = None
+reset_current_words = None
+reset_word_index = None
+
+confirm_signal = loop.signal()
+swipe_signal = loop.signal()
+input_signal = loop.signal()
 
 
 async def dispatch_DebugLinkDecision(ctx, msg):
-    signal.send(CONFIRMED if msg.yes_no else CANCELLED)
+    if msg.yes_no is not None:
+        confirm_signal.send(confirm.CONFIRMED if msg.yes_no else confirm.CANCELLED)
+    if msg.up_down is not None:
+        swipe_signal.send(swipe.SWIPE_DOWN if msg.up_down else swipe.SWIPE_UP)
+    if msg.input is not None:
+        input_signal.send(msg.input)
 
 
 async def dispatch_DebugLinkGetState(ctx, msg):
     m = DebugLinkState()
     m.mnemonic = storage.get_mnemonic()
     m.passphrase_protection = storage.has_passphrase()
-    m.reset_entropy = reset_device.internal_entropy
-    m.reset_word = reset_device.current_word
+    m.reset_word_pos = reset_word_index
+    m.reset_entropy = reset_internal_entropy
+    if reset_current_words:
+        m.reset_word = ' '.join(reset_current_words)
     return m
 
 
-async def dispatch_DebugLinkStop(ctx, msg):
-    pass
-
-
-async def dispatch_DebugLinkMemoryRead(ctx, msg):
-    m = DebugLinkMemory()
-    m.memory = bytes_at(msg.address, msg.length)
-    return m
-
-
-async def dispatch_DebugLinkMemoryWrite(ctx, msg):
-    l = len(msg.memory)
-    data = bytearray_at(msg.address, l)
-    data[0:l] = msg.memory
-
-
-async def dispatch_DebugLinkFlashErase(ctx, msg):
-    # TODO: erase(msg.sector)
-    pass
-
-
-async def memory_stats(interval):
-    sleep = loop.sleep(interval * 1000 * 1000)
-    while True:
-        micropython.mem_info()
-        gc.collect()
-        await sleep
-
-
 def boot():
-    register(DebugLinkDecision, protobuf_workflow, dispatch_DebugLinkDecision)
-    register(DebugLinkGetState, protobuf_workflow, dispatch_DebugLinkGetState)
-    register(DebugLinkStop, protobuf_workflow, dispatch_DebugLinkStop)
-    register(DebugLinkMemoryRead, protobuf_workflow, dispatch_DebugLinkMemoryRead)
-    register(DebugLinkMemoryWrite, protobuf_workflow, dispatch_DebugLinkMemoryWrite)
-    register(DebugLinkFlashErase, protobuf_workflow, dispatch_DebugLinkFlashErase)
-
-    # loop.schedule(memory_stats(10))
+    register(wire_types.DebugLinkDecision, protobuf_workflow, dispatch_DebugLinkDecision)
+    register(wire_types.DebugLinkGetState, protobuf_workflow, dispatch_DebugLinkGetState)

src/apps/management/reset_device.py

@@ -18,14 +18,10 @@ from apps.common.confirm import require_confirm
 from apps.management.change_pin import request_pin_confirm
 
 if __debug__:
-    internal_entropy = None
-    current_word = None
+    from apps import debug
 
 
 async def reset_device(ctx, msg):
-    if __debug__:
-        global internal_entropy
-
     # validate parameters and device state
     if msg.strength not in (128, 192, 256):
         raise wire.FailureError(
@@ -36,31 +32,29 @@ async def reset_device(ctx, msg):
             FailureType.UnexpectedMessage,
             'Already initialized')
 
+    # request new PIN
     if msg.pin_protection:
-        # request new PIN
         newpin = await request_pin_confirm(ctx)
     else:
-        # new PIN is empty
         newpin = ''
 
     # generate and display internal entropy
-    internal_entropy = random.bytes(32)
+    internal_ent = random.bytes(32)
+    if __debug__:
+        debug.reset_internal_entropy = internal_ent
     if msg.display_random:
-        await show_entropy(ctx, internal_entropy)
+        await show_entropy(ctx, internal_ent)
 
     # request external entropy and compute mnemonic
-    ack = await ctx.call(EntropyRequest(), wire_types.EntropyAck)
-    mnemonic = generate_mnemonic(
-        msg.strength, internal_entropy, ack.entropy)
+    ent_ack = await ctx.call(EntropyRequest(), wire_types.EntropyAck)
+    mnemonic = generate_mnemonic(msg.strength, internal_ent, ent_ack.entropy)
 
-    if msg.skip_backup:
-        # let user backup the mnemonic later
-        pass
-    else:
-        # warn user about mnemonic safety
+    if not msg.skip_backup:
+        # require confirmation of the mnemonic safety
         await show_warning(ctx)
+
+        # show mnemonic and require confirmation of a random word
         while True:
-            # show mnemonic and require confirmation of a random word
             await show_mnemonic(ctx, mnemonic)
             if await check_mnemonic(ctx, mnemonic):
                 break
@@ -77,11 +71,11 @@ async def reset_device(ctx, msg):
     storage.load_mnemonic(
         mnemonic=mnemonic, needs_backup=msg.skip_backup)
 
-    # show success message
+    # show success message.  if we skipped backup, it's possible that homescreen
+    # is still running, uninterrupted.  restart it to pick up new label.
     if not msg.skip_backup:
         await show_success(ctx)
     else:
-        # trigger reload of homescreen
         workflow.restartdefault()
 
     return Success(message='Initialized')
@@ -142,7 +136,7 @@ async def show_success(ctx):
         cancel=None)
 
 
-async def show_entropy(ctx, entropy: int):
+async def show_entropy(ctx, entropy: bytes):
     estr = hexlify(entropy).decode()
     lines = chunks(estr, 16)
     content = Text('Internal entropy', ui.ICON_RESET, ui.MONO, *lines)
@@ -165,6 +159,9 @@ async def show_mnemonic(ctx, mnemonic: str):
 
 @ui.layout
 async def show_mnemonic_page(page: int, page_count: int, pages: list):
+    if __debug__:
+        debug.reset_current_words = [word for _, word in pages[page]]
+
     lines = ['%2d. %s' % (wi + 1, word) for wi, word in pages[page]]
     content = Text('Recovery seed', ui.ICON_RESET, ui.MONO, *lines)
     content = Scrollpage(content, page, page_count)
@@ -194,6 +191,9 @@ async def check_mnemonic(ctx, mnemonic: str) -> bool:
 
 @ui.layout
 async def check_word(ctx, words: list, index: int):
+    if __debug__:
+        debug.reset_word_index = index
+
     keyboard = MnemonicKeyboard('Type the %s word:' % format_ordinal(index + 1))
     result = await ctx.wait(keyboard)
     return result == words[index]

src/trezor/messages/DebugLinkDecision.py

@@ -4,14 +4,20 @@ import protobuf as p
 
 class DebugLinkDecision(p.MessageType):
     FIELDS = {
-        1: ('yes_no', p.BoolType, 0),  # required
+        1: ('yes_no', p.BoolType, 0),
+        2: ('up_down', p.BoolType, 0),
+        3: ('input', p.UnicodeType, 0),
     }
     MESSAGE_WIRE_TYPE = 100
 
     def __init__(
         self,
         yes_no: bool = None,
+        up_down: bool = None,
+        input: str = None,
         **kwargs,
     ):
         self.yes_no = yes_no
+        self.up_down = up_down
+        self.input = input
         p.MessageType.__init__(self, **kwargs)

src/trezor/messages/DebugLinkState.py

@@ -15,6 +15,7 @@ class DebugLinkState(p.MessageType):
         8: ('reset_entropy', p.BytesType, 0),
         9: ('recovery_fake_word', p.UnicodeType, 0),
         10: ('recovery_word_pos', p.UVarintType, 0),
+        11: ('reset_word_pos', p.UVarintType, 0),
     }
     MESSAGE_WIRE_TYPE = 102
 
@@ -30,6 +31,7 @@ class DebugLinkState(p.MessageType):
         reset_entropy: bytes = None,
         recovery_fake_word: str = None,
         recovery_word_pos: int = None,
+        reset_word_pos: int = None,
         **kwargs,
     ):
         self.layout = layout
@@ -42,4 +44,5 @@ class DebugLinkState(p.MessageType):
         self.reset_entropy = reset_entropy
         self.recovery_fake_word = recovery_fake_word
         self.recovery_word_pos = recovery_word_pos
+        self.reset_word_pos = reset_word_pos
         p.MessageType.__init__(self, **kwargs)

src/trezor/ui/confirm.py

@@ -4,6 +4,9 @@ from trezor.ui import Widget
 from trezor.ui.button import BTN_ACTIVE, BTN_CLICKED, BTN_STARTED, Button
 from trezor.ui.loader import Loader
 
+if __debug__:
+    from apps.debug import confirm_signal
+
 CONFIRMED = const(1)
 CANCELLED = const(2)
 DEFAULT_CONFIRM = res.load(ui.ICON_CONFIRM)
@@ -11,8 +14,12 @@ DEFAULT_CANCEL = res.load(ui.ICON_CANCEL)
 
 
 class ConfirmDialog(Widget):
-
-    def __init__(self, content, confirm=DEFAULT_CONFIRM, cancel=DEFAULT_CANCEL, confirm_style=ui.BTN_CONFIRM, cancel_style=ui.BTN_CANCEL):
+    def __init__(self,
+                 content,
+                 confirm=DEFAULT_CONFIRM,
+                 cancel=DEFAULT_CANCEL,
+                 confirm_style=ui.BTN_CONFIRM,
+                 cancel_style=ui.BTN_CANCEL):
         self.content = content
         if cancel is not None:
             self.confirm = Button(
@@ -37,7 +44,10 @@ class ConfirmDialog(Widget):
                 return CANCELLED
 
     async def __iter__(self):
-        return await loop.wait(super().__iter__(), self.content)
+        if __debug__:
+            return await loop.wait(super().__iter__(), self.content, confirm_signal)
+        else:
+            return await loop.wait(super().__iter__(), self.content)
 
 
 _STARTED = const(-1)
@@ -81,5 +91,8 @@ class HoldToConfirmDialog(Widget):
             else:
                 content_loop = self.content
             confirm_loop = super().__iter__()  # default loop (render on touch)
-            result = await loop.wait(content_loop, confirm_loop)
+            if __debug__:
+                result = await loop.wait(content_loop, confirm_loop, confirm_signal)
+            else:
+                result = await loop.wait(content_loop, confirm_loop)
         return result

src/trezor/ui/mnemonic.py

@@ -3,6 +3,9 @@ from trezor.crypto import bip39
 from trezor.ui import display
 from trezor.ui.button import BTN_CLICKED, ICON, Button
 
+if __debug__:
+    from apps.debug import input_signal
+
 MNEMONIC_KEYS = ('abc', 'def', 'ghi', 'jkl', 'mno', 'pqr', 'stu', 'vwx', 'yz')
 
 
@@ -145,6 +148,12 @@ class MnemonicKeyboard(ui.Widget):
                 btn.disable()
 
     async def __iter__(self):
+        if __debug__:
+            return await loop.wait(self.edit_loop(), input_signal)
+        else:
+            return await self.edit_loop()
+
+    async def edit_loop(self):
         timeout = loop.sleep(1000 * 1000 * 1)
         touch = loop.select(io.TOUCH)
         wait_timeout = loop.wait(touch, timeout)

src/trezor/ui/scroll.py

@@ -1,6 +1,9 @@
 from micropython import const
 from trezor import loop, ui, res
-from .swipe import Swipe, SWIPE_UP, SWIPE_DOWN, SWIPE_VERTICAL
+from trezor.ui.swipe import Swipe, SWIPE_UP, SWIPE_DOWN, SWIPE_VERTICAL
+
+if __debug__:
+    from apps.debug import swipe_signal
 
 
 async def change_page(page, page_count):
@@ -11,7 +14,11 @@ async def change_page(page, page_count):
             d = SWIPE_DOWN
         else:
             d = SWIPE_VERTICAL
-        s = await Swipe(directions=d)
+        swipe = Swipe(directions=d)
+        if __debug__:
+            s = await loop.wait(swipe, swipe_signal)
+        else:
+            s = await swipe
         if s == SWIPE_UP:
             return page + 1  # scroll down
         elif s == SWIPE_DOWN: