loop: rename Future to Signal

Future semantics were changed to allow multiple deliveries to avoid allocating more future objects than neccessary, and Signal describes this behaviour more accurately.

src/apps/common/confirm.py

@@ -3,7 +3,7 @@ from trezor.utils import unimport
 
 # used to confirm/cancel the dialogs from outside of this module (i.e.
 # through debug link)
-future = loop.Future()
+signal = loop.Signal()
 
 
 @unimport
@@ -20,7 +20,7 @@ async def confirm(session_id, content=None, code=None, *args, **kwargs):
     if code is None:
         code = Other
     await wire.reply_message(session_id, ButtonRequest(code=code), ButtonAck)
-    return await loop.Wait((future, dialog)) == CONFIRMED
+    return await loop.Wait((signal, dialog)) == CONFIRMED
 
 
 @unimport
@@ -40,7 +40,7 @@ async def hold_to_confirm(session_id, content=None, code=None, *args, **kwargs):
     if code is None:
         code = Other
     await wire.reply_message(session_id, ButtonRequest(code=code), ButtonAck)
-    return await loop.Wait((future, dialog)) == CONFIRMED
+    return await loop.Wait((signal, dialog)) == CONFIRMED
 
 
 @unimport

src/apps/debug/__init__.py

@@ -6,8 +6,8 @@ from trezor.messages.wire_types import \
 
 async def dispatch_DebugLinkDecision(msg, session_id):
     from trezor.ui.confirm import CONFIRMED, CANCELLED
-    from ..common.confirm import future
+    from ..common.confirm import signal
-    future.resolve(CONFIRMED if msg.yes_no else CANCELLED)
+    signal.send(CONFIRMED if msg.yes_no else CANCELLED)
 
 
 async def dispatch_DebugLinkGetState(msg, session_id):

src/trezor/loop.py

@@ -1,7 +1,6 @@
 import utime
 from micropython import const
 from uheapq import heappop, heappush, heapify
-from .utils import type_gen
 from . import msg, log, ui
 
 if __debug__:
@@ -136,7 +135,7 @@ class Select(Syscall):
 NO_VALUE = ()
 
 
-class Future(Syscall):
+class Signal(Syscall):
 
     def __init__(self):
         self.value = NO_VALUE
@@ -146,7 +145,7 @@ class Future(Syscall):
         self.task = task
         self._deliver()
 
-    def resolve(self, value):
+    def send(self, value):
         self.value = value
         self._deliver()
 

src/trezor/wire/__init__.py

@@ -77,16 +77,16 @@ def setup():
 
 async def read_message(session_id, *exp_types):
     log.info(__name__, 'session %d: read types %s', session_id, exp_types)
-    future = Future()
+    signal = Signal()
     if session_id == SESSION_V1:
         wire_decoder = decode_wire_v1_stream(
-            _dispatch_and_build_protobuf, session_id, exp_types, future)
+            _dispatch_and_build_protobuf, session_id, exp_types, signal)
     else:
         wire_decoder = decode_wire_stream(
-            _dispatch_and_build_protobuf, session_id, exp_types, future)
+            _dispatch_and_build_protobuf, session_id, exp_types, signal)
     wire_decoder.send(None)
     register_session(session_id, wire_decoder)
-    return await future
+    return await signal
 
 
 async def write_message(session_id, pbuf_message):
@@ -178,15 +178,15 @@ def _handle_unknown_session(session_id, report_data):
     pass  # TODO
 
 
-def _dispatch_and_build_protobuf(msg_type, data_len, session_id, exp_types, future):
+def _dispatch_and_build_protobuf(msg_type, data_len, session_id, exp_types, signal):
     if msg_type in exp_types:
         pbuf_type = get_protobuf_type(msg_type)
-        builder = build_protobuf_message(pbuf_type, future.resolve)
+        builder = build_protobuf_message(pbuf_type, signal.send)
         builder.send(None)
         return pbuf_type.load(target=builder)
     else:
         from trezor.messages.FailureType import UnexpectedMessage
-        future.resolve(FailureError(UnexpectedMessage, 'Unexpected message'))
+        signal.send(FailureError(UnexpectedMessage, 'Unexpected message'))
         return _handle_registered_type(msg_type, data_len, session_id)