make imports more local, remove trezor.workflows, minor tweaks

src/apps/homescreen/layout_homescreen.py

@@ -1,8 +1,10 @@
 from trezor import ui, loop, res
-from trezor.ui.swipe import Swipe
+from trezor.utils import unimport
 
 
 async def swipe_to_rotate():
+    from trezor.ui.swipe import Swipe
+
     while True:
         degrees = await Swipe(absolute=True)
         ui.display.orientation(degrees)
@@ -10,9 +12,12 @@ async def swipe_to_rotate():
 
 async def animate_logo():
     icon = res.load('apps/homescreen/res/trezor.toig')
-    async for fg in ui.pulse_animation(ui.WHITE, ui.GREY, speed=400000):
+
+    def render(fg):
         ui.display.icon(0, 0, icon, fg, ui.BLACK)
+    await ui.animate_pulse(render, ui.WHITE, ui.GREY, speed=400000)
 
 
+@unimport
 async def layout_homescreen():
     await loop.Wait([swipe_to_rotate(), animate_logo()])

src/apps/management/confirm.py

@@ -19,7 +19,7 @@ async def confirm(session_id, content=None, code=None, **kwargs):
 
 
 @unimport
-async def protect_with_confirm(*args, **kwargs):
+async def require_confirm(*args, **kwargs):
     from trezor.messages.FailureType import ActionCancelled
 
     confirmed = await confirm(*args, **kwargs)

src/apps/management/layout_load_device.py

@@ -4,8 +4,8 @@ from trezor.utils import unimport
 
 @unimport
 async def layout_load_device(session_id, message):
-    from trezor.workflows.confirm import protect_with_confirm
     from trezor.messages.Success import Success
+    from .confirm import require_confirm
 
     ui.clear()
     ui.display.text_center(
@@ -13,7 +13,7 @@ async def layout_load_device(session_id, message):
     ui.display.text_center(
         120, 100, 'Never do this, please.', ui.NORMAL, ui.WHITE, ui.BLACK)
 
-    await protect_with_confirm(session_id)
+    await require_confirm(session_id)
 
     # TODO
 

src/apps/management/layout_reset_device.py

@@ -1,31 +1,24 @@
 from trezor import wire, ui
-from trezor.workflows.request_pin import request_pin_repeatedly
-from trezor.messages.wire_types import EntropyAck
-from trezor.ui.button import Button, CONFIRM_BUTTON, CONFIRM_BUTTON_ACTIVE
-from trezor.ui.scroll import paginate, render_scrollbar, animate_swipe
-from trezor.crypto import hashlib, random, bip39
 from trezor.utils import unimport, chunks
 
-from .storage import get_storage, set_storage
-
 
 @unimport
 async def layout_reset_device(message, session_id):
     from trezor.messages.Success import Success
     from trezor.messages.Storage import Storage
     from trezor.messages.FailureType import UnexpectedMessage
+    from .storage import get_storage, set_storage
+    from .request_pin import request_pin_twice
 
     if get_storage(session_id):
-        raise wire.FailureError(
-            UnexpectedMessage, 'Device is already initialized')
+        raise wire.FailureError(UnexpectedMessage, 'Already initialized')
 
     mnemonic = await generate_mnemonic(
         message.strength, message.display_random, session_id)
-
     await show_mnemonic(mnemonic)
 
     if message.pin_protection:
-        pin = await request_pin_repeatedly(session_id)
+        pin = await request_pin_twice(session_id)
     else:
         pin = ''
 
@@ -40,8 +33,10 @@ async def layout_reset_device(message, session_id):
 
 @unimport
 async def generate_mnemonic(strength, display_random, session_id):
+    from trezor.crypto import hashlib, random, bip39
     from trezor.messages.EntropyRequest import EntropyRequest
     from trezor.messages.FailureType import Other
+    from trezor.messages.wire_types import EntropyAck
 
     if strength not in (128, 192, 256):
         raise wire.FailureError(
@@ -50,19 +45,23 @@ async def generate_mnemonic(strength, display_random, session_id):
     # if display_random:
     #     raise wire.FailureError(Other, 'Entropy display not implemented')
 
-    ack = await wire.reply_message(
-        session_id, EntropyRequest(), EntropyAck)
+    ack = await wire.reply_message(session_id, EntropyRequest(), EntropyAck)
+
+    if len(ack.entropy) != 32:
+        raise wire.FailureError(Other, 'Invalid entropy (has to be 32 bytes)')
 
-    strength_bytes = strength // 8
     ctx = hashlib.sha256()
-    ctx.update(random.bytes(strength_bytes))
-    ctx.update(ack.entropy[:strength_bytes])
+    ctx.update(random.bytes(32))
+    ctx.update(ack.entropy)
     entropy = ctx.digest()
 
-    return bip39.from_data(entropy)
+    return bip39.from_data(entropy[:strength // 8])
 
 
+@unimport
 async def show_mnemonic(mnemonic):
+    from trezor.ui.scroll import paginate
+
     first_page = const(0)
     words_per_page = const(4)
     words = list(enumerate(mnemonic.split()))
@@ -71,6 +70,9 @@ async def show_mnemonic(mnemonic):
 
 
 async def show_mnemonic_page(page, page_count, mnemonic):
+    from trezor.ui.button import Button, CONFIRM_BUTTON, CONFIRM_BUTTON_ACTIVE
+    from trezor.ui.scroll import render_scrollbar, animate_swipe
+
     ui.clear()
     ui.display.text(
         10, 30, 'Write down your seed', ui.BOLD, ui.LIGHT_GREEN, ui.BLACK)

src/apps/management/layout_wipe_device.py

@@ -1,14 +1,12 @@
-from trezor import wire
 from trezor import ui
 from trezor.utils import unimport
-from trezor.workflows.confirm import protect_with_confirm
-
-from .storage import clear_storage
 
 
 @unimport
 async def layout_wipe_device(message, session_id):
     from trezor.messages.Success import Success
+    from .confirm import require_confirm
+    from .storage import clear_storage
 
     ui.clear()
     ui.display.text(10, 30, 'Wiping device', ui.BOLD, ui.LIGHT_GREEN, ui.BLACK)
@@ -18,7 +16,7 @@ async def layout_wipe_device(message, session_id):
     ui.display.text(10, 164, 'All data will be lost.',
                     ui.NORMAL, ui.WHITE, ui.BLACK)
 
-    await protect_with_confirm(session_id)
+    await require_confirm(session_id)
 
     clear_storage(session_id)
 

src/apps/management/request_pin.py

@@ -26,7 +26,7 @@ async def request_pin(session_id, *args, **kwargs):
 
 
 @unimport
-async def request_pin_repeatedly(session_id):
+async def request_pin_twice(session_id):
     from trezor.messages.FailureType import PinInvalid
 
     pin_first = await request_pin(session_id)

src/apps/wallet/layout_sign_message.py

@@ -3,8 +3,7 @@ from trezor.utils import unimport
 
 
 @unimport
-async def layout_sign_message(message):
-    from trezor.workflows.confirm import protect_with_confirm
+async def layout_sign_message(message, session_id):
     from trezor.messages.Success import Success
 
     ui.clear()
@@ -12,8 +11,6 @@ async def layout_sign_message(message):
                     ui.BOLD, ui.LIGHT_GREEN, ui.BLACK)
     ui.display.text(10, 60, message.message, ui.MONO, ui.WHITE, ui.BLACK)
 
-    await protect_with_confirm(confirm='Sign')
-
     # TODO
 
     return Success(message='Signed')

src/trezor/wire/__init__.py

@@ -16,6 +16,10 @@ _session_handlers = {}  # session id -> generator
 _workflow_genfuncs = {}  # wire type -> (generator function, args)
 _opened_sessions = set()  # session ids
 
+# TODO: get rid of this, use callbacks instead
+report_writer = write_report_stream()
+report_writer.send(None)
+
 
 def generate_session_id():
     while True:
@@ -54,30 +58,17 @@ def register_session(session_id, handler):
 
 
 def setup():
-    report_writer = write_report_stream()
-    report_writer.send(None)
-
-    open_session_handler = _handle_open_session(report_writer)
-    open_session_handler.send(None)
-
-    close_session_handler = _handle_close_session(report_writer)
-    close_session_handler.send(None)
-
-    fallback_session_handler = _handle_unknown_session()
-    fallback_session_handler.send(None)
-
     session_dispatcher = dispatch_reports_by_session(
         _session_handlers,
-        open_session_handler,
-        close_session_handler,
-        fallback_session_handler)
+        _handle_open_session,
+        _handle_close_session,
+        _handle_unknown_session)
     session_dispatcher.send(None)
-
     schedule_task(read_report_stream(session_dispatcher))
 
 
 async def read_message(session_id, *exp_types):
-    log.info(__name__, 'reading message, one of %s', exp_types)
+    log.info(__name__, 'reading message of types %s', exp_types)
     future = Future()
     wire_decoder = decode_wire_stream(
         _dispatch_and_build_protobuf, session_id, exp_types, future)
@@ -90,9 +81,7 @@ async def write_message(session_id, pbuf_message):
     log.info(__name__, 'writing message %s', pbuf_message)
     msg_data = await pbuf_message.dumps()
     msg_type = pbuf_message.message_type.wire_type
-    writer = write_report_stream()
-    writer.send(None)
-    encode_wire_message(msg_type, msg_data, session_id, writer)
+    encode_wire_message(msg_type, msg_data, session_id, report_writer)
 
 
 async def reply_message(session_id, pbuf_message, *exp_types):
@@ -151,26 +140,21 @@ def protobuf_handler(msg_type, data_len, session_id, callback, *args):
     return pbuf_type.load(builder)
 
 
-def _handle_open_session(write_target):
-    while True:
-        yield
-        session_id = open_session()
-        wire_decoder = decode_wire_stream(_handle_registered_type, session_id)
-        wire_decoder.send(None)
-        register_session(session_id, wire_decoder)
-        encode_session_open_message(session_id, write_target)
+def _handle_open_session():
+    session_id = open_session()
+    wire_decoder = decode_wire_stream(_handle_registered_type, session_id)
+    wire_decoder.send(None)
+    register_session(session_id, wire_decoder)
+    encode_session_open_message(session_id, report_writer)
 
 
-def _handle_close_session(write_target):
-    while True:
-        session_id = yield
-        close_session(session_id)
-        encode_session_close_message(session_id, write_target)
+def _handle_close_session(session_id):
+    close_session(session_id)
+    encode_session_close_message(session_id, report_writer)
 
 
-def _handle_unknown_session():
-    while True:
-        yield  # TODO
+def _handle_unknown_session(session_id, report_data):
+    pass  # TODO
 
 
 def _dispatch_and_build_protobuf(msg_type, data_len, session_id, exp_types, future):