clearpilot: initial commit of full source

common/timeout.py

@@ -0,0 +1,27 @@
+import signal
+
+class TimeoutException(Exception):
+  pass
+
+class Timeout:
+  """
+  Timeout context manager.
+  For example this code will raise a TimeoutException:
+  with Timeout(seconds=5, error_msg="Sleep was too long"):
+    time.sleep(10)
+  """
+  def __init__(self, seconds, error_msg=None):
+    if error_msg is None:
+      error_msg = f'Timed out after {seconds} seconds'
+    self.seconds = seconds
+    self.error_msg = error_msg
+
+  def handle_timeout(self, signume, frame):
+    raise TimeoutException(self.error_msg)
+
+  def __enter__(self):
+    signal.signal(signal.SIGALRM, self.handle_timeout)
+    signal.alarm(self.seconds)
+
+  def __exit__(self, exc_type, exc_val, exc_tb):
+    signal.alarm(0)