feat(models): represents a role in the cluster

konsensus/models/role.py

@@ -0,0 +1,18 @@
+from typing import Callable
+from node import Node
+
+
+class Role:
+    """Represents roles corresponding to the cluster"""
+    def __init__(self, node: Node) -> None:
+        self.node = node
+        self.node.register(self)
+        self.running = True
+        self.logger = node.logger.getChild(type(self).__name__)
+
+    def set_timer(self, seconds: int, callback: Callable):
+        return self.node.network.set_timer(self.node.address, seconds, lambda: self.running and callback())
+
+    def stop(self):
+        self.running = False
+        self.node.unregister(self)