signals workaround for windows (#695)

* Contributor: nicolasochem, Effort=1h
* Reviewer: jdsika, Effort=0.5h
---------

Signed-off-by: jdsika <carlo.van-driesten@vdl.digital>
Co-authored-by: jdsika <carlo.van-driesten@vdl.digital>

src/pay/payment_producer.py

@@ -1,5 +1,5 @@
-import _thread
 import os
+import platform
 import signal
 import threading
 from datetime import datetime, timedelta
@@ -154,19 +154,26 @@ def exit(self, exit_code):
                 self.life_cycle.is_running()
                 and threading.current_thread() is not threading.main_thread()
             ):
+                if platform.system() == "Windows":
+                    abnormal_signal = signal.SIGTERM
+                    normal_signal = signal.SIGTERM
+                else:
+                    # This will propagate the exit status to main process on linux.
+                    abnormal_signal = signal.SIGUSR2
+                    normal_signal = signal.SIGUSR1
                 if self.consumer_failure:
-                    os.kill(os.getpid(), signal.SIGUSR2)
+                    os.kill(os.getpid(), abnormal_signal)
                     logger.debug(
-                        "Payment failure, sending sigusr2 signal to main thread."
+                        "Payment failure, sending abnormal kill signal to main thread."
                     )
                 elif exit_code != ExitCode.SUCCESS:
-                    os.kill(os.getpid(), signal.SIGUSR2)
+                    os.kill(os.getpid(), abnormal_signal)
                     logger.debug(
-                        "Producer failure, sending sigusr2 signal to main thread."
+                        "Producer failure, sending abnormal kill signal to main thread."
                     )
                 else:
-                    os.kill(os.getpid(), signal.SIGUSR1)
-                    logger.debug("Sending sigusr1 signal.")
+                    os.kill(os.getpid(), normal_signal)
+                    logger.debug("Sending normal kill signal.")
                 exit_program(
                     exit_code,
                     "TRD Exit triggered by producer",

src/util/process_life_cycle.py

@@ -2,7 +2,11 @@
 import logging
 import queue
 import signal
-from _signal import SIGABRT, SIGILL, SIGSEGV, SIGTERM, SIGUSR1, SIGUSR2
+import platform
+from signal import SIGABRT, SIGILL, SIGSEGV, SIGTERM
+
+if platform.system() != "Windows":
+    from signal import SIGUSR1, SIGUSR2
 from enum import Enum, auto
 from time import sleep
 
@@ -301,9 +305,11 @@ def do_set_up_dirs(self, e):
         self.__baking_dirs = BakingDirs(self.args, self.__cfg.get_baking_address())
 
     def do_register_signals(self, e):
-        for sig in (SIGABRT, SIGILL, SIGSEGV, SIGTERM, SIGUSR2):
+        for sig in (SIGABRT, SIGILL, SIGSEGV, SIGTERM):
             signal.signal(sig, self.stop_handler)
-        signal.signal(SIGUSR1, self.producer_exit_handler)
+        if "SIGUSR1" in globals():
+            signal.signal(SIGUSR1, self.producer_exit_handler)
+            signal.signal(SIGUSR2, self.stop_handler)
 
     def do_init_service_fees(self, e):
         self.__srvc_fee_calc = ServiceFeeCalculator(