apps: reduce unimport usage

unimport should be used only on the workflow dispatchers.

src/apps/common/confirm.py

@@ -1,5 +1,4 @@
 from trezor import wire, ui, loop
-from trezor.utils import unimport
 
 # used to confirm/cancel the dialogs from outside of this module (i.e.
 # through debug link)
@@ -8,7 +7,6 @@ if __debug__:
 
 
 @ui.layout
-@unimport
 async def confirm(ctx, content, code=None, *args, **kwargs):
     from trezor.ui.confirm import ConfirmDialog, CONFIRMED
     from trezor.messages.ButtonRequest import ButtonRequest
@@ -31,7 +29,6 @@ async def confirm(ctx, content, code=None, *args, **kwargs):
 
 
 @ui.layout
-@unimport
 async def hold_to_confirm(ctx, content, code=None, *args, **kwargs):
     from trezor.ui.confirm import HoldToConfirmDialog, CONFIRMED
     from trezor.messages.ButtonRequest import ButtonRequest
@@ -53,7 +50,6 @@ async def hold_to_confirm(ctx, content, code=None, *args, **kwargs):
     return await waiter == CONFIRMED
 
 
-@unimport
 async def require_confirm(*args, **kwargs):
     from trezor.messages.FailureType import ActionCancelled
 

src/apps/common/request_words.py

@@ -1,5 +1,4 @@
 from trezor import wire, ui, loop
-from trezor.utils import unimport
 
 # used to confirm/cancel the dialogs from outside of this module (i.e.
 # through debug link)
@@ -8,7 +7,6 @@ if __debug__:
 
 
 @ui.layout
-@unimport
 async def request_words(ctx, content, code=None, *args, **kwargs):
     from trezor.ui.word_select import WordSelector
     from trezor.messages.ButtonRequest import ButtonRequest

src/apps/debug/__init__.py

@@ -1,17 +1,20 @@
 from trezor import log
 from trezor import loop
+from trezor.utils import unimport
 from trezor.wire import register, protobuf_workflow
 from trezor.messages.wire_types import \
     DebugLinkDecision, DebugLinkGetState, DebugLinkStop, \
     DebugLinkMemoryRead, DebugLinkMemoryWrite, DebugLinkFlashErase
 
 
+@unimport
 async def dispatch_DebugLinkDecision(ctx, msg):
     from trezor.ui.confirm import CONFIRMED, CANCELLED
     from apps.common.confirm import signal
     signal.send(CONFIRMED if msg.yes_no else CANCELLED)
 
 
+@unimport
 async def dispatch_DebugLinkGetState(ctx, msg):
     from trezor.messages.DebugLinkState import DebugLinkState
     from apps.common import storage
@@ -26,10 +29,12 @@ async def dispatch_DebugLinkGetState(ctx, msg):
     return m
 
 
+@unimport
 async def dispatch_DebugLinkStop(ctx, msg):
     pass
 
 
+@unimport
 async def dispatch_DebugLinkMemoryRead(ctx, msg):
     from trezor.messages.DebugLinkMemory import DebugLinkMemory
     from uctypes import bytes_at
@@ -38,6 +43,7 @@ async def dispatch_DebugLinkMemoryRead(ctx, msg):
     return m
 
 
+@unimport
 async def dispatch_DebugLinkMemoryWrite(ctx, msg):
     from uctypes import bytearray_at
     l = len(msg.memory)
@@ -45,6 +51,7 @@ async def dispatch_DebugLinkMemoryWrite(ctx, msg):
     data[0:l] = msg.memory
 
 
+@unimport
 async def dispatch_DebugLinkFlashErase(ctx, msg):
     # TODO: erase(msg.sector)
     pass

src/apps/ethereum/get_address.py

@@ -1,8 +1,6 @@
 from trezor import wire, ui
-from trezor.utils import unimport
 
 
-@unimport
 async def layout_ethereum_get_address(ctx, msg):
     from trezor.messages.EthereumAddress import EthereumAddress
     from trezor.crypto.curve import secp256k1

src/apps/ethereum/layout.py

@@ -1,13 +1,12 @@
 from apps.common.confirm import *
 from trezor import wire, ui
-from trezor.utils import unimport, chunks
+from trezor.utils import chunks
 from trezor.messages import ButtonRequestType
 from trezor.ui.text import Text
 from ubinascii import hexlify
 from . import networks
 
 
-@unimport
 async def confirm_tx(ctx, to, value, chain_id, token=None):  # todo wording
     str_to = '0x' + hexlify(to).decode()  # todo use ethereum address format
     content = Text('Confirm transaction', ui.ICON_RESET,
@@ -17,7 +16,6 @@ async def confirm_tx(ctx, to, value, chain_id, token=None):  # todo wording
     return await confirm(ctx, content, ButtonRequestType.SignTx)  # we use SignTx, not ConfirmOutput, for compatibility with T1
 
 
-@unimport
 async def confirm_fee(ctx, spending, gas_price, gas_limit, chain_id, token=None):  # todo wording
     content = Text('Confirm fee', ui.ICON_RESET,
                    'Sending: %s' % format_amount(spending, token, chain_id),
@@ -26,7 +24,6 @@ async def confirm_fee(ctx, spending, gas_price, gas_limit, chain_id, token=None)
     return await hold_to_confirm(ctx, content, ButtonRequestType.SignTx)
 
 
-@unimport
 async def confirm_data(ctx, data, data_total):  # todo wording
     str_data = hexlify(data[:8]).decode() + '..'
     content = Text('Confirm data:', ui.ICON_RESET,

src/apps/ethereum/sign_message.py

@@ -1,5 +1,3 @@
-from trezor.utils import unimport
-
 
 def message_digest(message):
     from apps.wallet.sign_tx.signing import write_varint
@@ -16,7 +14,6 @@ def message_digest(message):
     return h.get_digest(True)
 
 
-@unimport
 async def ethereum_sign_message(ctx, msg):
     from trezor.messages.EthereumMessageSignature import EthereumMessageSignature
     from trezor.crypto.curve import secp256k1

src/apps/ethereum/sign_tx.py

@@ -1,4 +1,3 @@
-from trezor.utils import unimport
 from trezor.messages.EthereumSignTx import EthereumSignTx
 from trezor.messages.EthereumTxRequest import EthereumTxRequest
 from trezor.messages import FailureType
@@ -10,7 +9,6 @@ from apps.ethereum import tokens, layout
 MAX_CHAIN_ID = 2147483630
 
 
-@unimport
 async def ethereum_sign_tx(ctx, msg):
     from trezor.crypto.hashlib import sha3_256
 

src/apps/ethereum/verify_message.py

@@ -1,7 +1,4 @@
-from trezor.utils import unimport
 
-
-@unimport
 async def ethereum_verify_message(ctx, msg):
     from .sign_message import message_digest
     from trezor.crypto.curve import secp256k1

src/apps/management/apply_settings.py

@@ -1,8 +1,6 @@
 from trezor import ui, wire
-from trezor.utils import unimport
 
 
-@unimport
 async def layout_apply_settings(ctx, msg):
     from trezor.messages.Success import Success
     from trezor.messages.FailureType import ProcessError

src/apps/management/change_pin.py

@@ -1,7 +1,6 @@
 from trezor import ui
 from trezor import config
 from trezor.pin import pin_to_int, show_pin_timeout
-from trezor.utils import unimport
 
 
 async def request_pin(ctx):
@@ -48,7 +47,6 @@ def confirm_change_pin(ctx, msg):
             'set new PIN?'))
 
 
-@unimport
 async def layout_change_pin(ctx, msg):
     from trezor.messages.Success import Success
     from trezor.messages.Failure import Failure

src/apps/management/load_device.py

@@ -1,9 +1,7 @@
 from trezor import wire, ui, config
 from trezor.pin import pin_to_int
-from trezor.utils import unimport
 
 
-@unimport
 async def layout_load_device(ctx, msg):
     from trezor.crypto import bip39
     from trezor.messages.Success import Success

src/apps/management/reset_device.py

@@ -8,7 +8,6 @@ if __debug__:
     current_word = None
 
 
-@unimport
 async def reset_device(ctx, msg):
     from trezor.ui.text import Text
     from trezor.crypto import hashlib, random, bip39

src/apps/management/wipe_device.py

@@ -1,8 +1,6 @@
 from trezor import ui
-from trezor.utils import unimport
 
 
-@unimport
 async def layout_wipe_device(ctx, msg):
     from trezor.messages.Success import Success
     from trezor.ui.text import Text

src/apps/wallet/cipher_key_value.py

@@ -1,5 +1,4 @@
 from trezor import ui
-from trezor.utils import unimport
 
 
 def cipher_key_value(msg, seckey: bytes) -> bytes:
@@ -25,7 +24,6 @@ def cipher_key_value(msg, seckey: bytes) -> bytes:
     return aes.update(msg.value)
 
 
-@unimport
 async def layout_cipher_key_value(ctx, msg):
     from trezor.messages.CipheredKeyValue import CipheredKeyValue
     from ..common import seed

src/apps/wallet/get_address.py

@@ -1,8 +1,6 @@
 from trezor import wire, ui
-from trezor.utils import unimport
 
 
-@unimport
 async def layout_get_address(ctx, msg):
     from trezor.messages.Address import Address
     from trezor.messages.FailureType import ProcessError

src/apps/wallet/get_entropy.py

@@ -1,8 +1,6 @@
 from trezor import wire, ui
-from trezor.utils import unimport
 
 
-@unimport
 async def layout_get_entropy(ctx, msg):
     from trezor.messages.Entropy import Entropy
     from trezor.crypto import random

src/apps/wallet/get_public_key.py

@@ -1,7 +1,4 @@
-from trezor.utils import unimport
 
-
-@unimport
 async def layout_get_public_key(ctx, msg):
     from trezor.messages.HDNodeType import HDNodeType
     from trezor.messages.PublicKey import PublicKey

src/apps/wallet/sign_identity.py

@@ -1,5 +1,4 @@
 from trezor import ui
-from trezor.utils import unimport
 
 
 def serialize_identity(identity):
@@ -80,7 +79,6 @@ def sign_challenge(seckey: bytes,
     return signature
 
 
-@unimport
 async def layout_sign_identity(ctx, msg):
     from trezor.messages.SignedIdentity import SignedIdentity
     from ..common import coins

src/apps/wallet/sign_message.py

@@ -1,8 +1,6 @@
 from trezor import ui
-from trezor.utils import unimport
 
 
-@unimport
 async def layout_sign_message(ctx, msg):
     from trezor.messages.MessageSignature import MessageSignature
     from trezor.crypto.curve import secp256k1

src/apps/wallet/sign_tx/__init__.py

@@ -1,8 +1,6 @@
-from trezor.utils import unimport
 from trezor import wire
 
 
-@unimport
 async def sign_tx(ctx, msg):
     from trezor.messages.RequestType import TXFINISHED
     from trezor.messages.wire_types import TxAck

src/apps/wallet/verify_message.py

@@ -1,8 +1,6 @@
 from trezor import ui
-from trezor.utils import unimport
 
 
-@unimport
 async def layout_verify_message(ctx, msg):
     from trezor.messages.Success import Success
     from trezor.crypto.curve import secp256k1

src/trezor/utils.py

@@ -4,28 +4,7 @@ import gc
 from trezorutils import halt, memcpy
 
 
-def _gf():
+def unimport(genfunc):
-    yield
-
-
-type_gen = type(_gf())
-
-
-def _unimport_func(func):
-    def inner(*args, **kwargs):
-        mods = set(sys.modules)
-        try:
-            ret = func(*args, **kwargs)
-        finally:
-            for mod in sys.modules:
-                if mod not in mods:
-                    del sys.modules[mod]
-            gc.collect()
-        return ret
-    return inner
-
-
-def _unimport_gen(genfunc):
     async def inner(*args, **kwargs):
         mods = set(sys.modules)
         try:
@@ -39,13 +18,6 @@ def _unimport_gen(genfunc):
     return inner
 
 
-def unimport(func):
-    if isinstance(func, type_gen):
-        return _unimport_gen(func)
-    else:
-        return _unimport_func(func)
-
-
 def chunks(items, size):
     for i in range(0, len(items), size):
         yield items[i:i + size]