`_root`: drop unused `typing` import

Allows forcing the opened actor to either obtain the passed registry
addrs or raise a runtime error.

setup.py

@@ -26,7 +26,7 @@ with open('docs/README.rst', encoding='utf-8') as f:
 setup(
     name="tractor",
     version='0.1.0a6dev0',  # alpha zone
-    description='structured concurrrent `trio`-"actors"',
+    description='structured concurrent `trio`-"actors"',
     long_description=readme,
     license='AGPLv3',
     author='Tyler Goodlet',
@@ -39,6 +39,7 @@ setup(
         'tractor.experimental',  # wacky ideas
         'tractor.trionics',  # trio extensions
         'tractor.msg',  # lowlevel data types
+        'tractor.devx',  # "dev-experience"
     ],
     install_requires=[
 
@@ -52,6 +53,7 @@ setup(
         # 'exceptiongroup',  # in stdlib as of 3.11!
 
         # tooling
+        'stackscope',
         'tricycle',
         'trio_typing',
         'colorlog',
@@ -63,16 +65,15 @@ setup(
         # debug mode REPL
         'pdbp',
 
+        # TODO: distributed transport using
+        # linux kernel networking
+        # 'pyroute2',
+
         # pip ref docs on these specs:
         # https://pip.pypa.io/en/stable/reference/requirement-specifiers/#examples
         # and pep:
         # https://peps.python.org/pep-0440/#version-specifiers
 
-        # windows deps workaround for ``pdbpp``
-        # https://github.com/pdbpp/pdbpp/issues/498
-        # https://github.com/pdbpp/fancycompleter/issues/37
-        'pyreadline3 ; platform_system == "Windows"',
-
     ],
     tests_require=['pytest'],
     python_requires=">=3.10",

tractor/_root.py

@@ -139,13 +139,19 @@ async def open_root_actor(
     )
     assert registry_addrs
 
-    loglevel = (loglevel or log._default_loglevel).upper()
+    loglevel = (
+        loglevel
+        or log._default_loglevel
+    ).upper()
 
-    if debug_mode and _spawn._spawn_method == 'trio':
+    if (
+        debug_mode
+        and _spawn._spawn_method == 'trio'
+    ):
         _state._runtime_vars['_debug_mode'] = True
 
-        # expose internal debug module to every actor allowing
+        # expose internal debug module to every actor allowing for
-        # for use of ``await tractor.breakpoint()``
+        # use of ``await tractor.pause()``
         enable_modules.append('tractor.devx._debug')
 
         # if debug mode get's enabled *at least* use that level of
@@ -164,7 +170,20 @@ async def open_root_actor(
             "Debug mode is only supported for the `trio` backend!"
         )
 
-    log.get_console_log(loglevel)
+    assert loglevel
+    _log = log.get_console_log(loglevel)
+    assert _log
+
+    # TODO: factor this into `.devx._stackscope`!!
+    if debug_mode:
+        try:
+            logger.info('Enabling `stackscope` traces on SIGUSR1')
+            from .devx import enable_stack_on_sig
+            enable_stack_on_sig()
+        except ImportError:
+            logger.warning(
+                '`stackscope` not installed for use in debug mode!'
+            )
 
     # closed into below ping task-func
     ponged_addrs: list[tuple[str, int]] = []