[qa] TestNode: Add wait_until_stopped helper method

test/functional/test_framework/test_node.py

@@ -17,9 +17,12 @@ from .util import (
     assert_equal,
     get_rpc_proxy,
     rpc_url,
+    wait_until,
 )
 from .authproxy import JSONRPCException
 
+BITCOIND_PROC_WAIT_TIMEOUT = 60
+
 class TestNode():
     """A class for representing a bitcoind node under test.
 
@@ -125,14 +128,20 @@ class TestNode():
         if not self.running:
             return True
         return_code = self.process.poll()
-        if return_code is not None:
-            # process has stopped. Assert that it didn't return an error code.
-            assert_equal(return_code, 0)
-            self.running = False
-            self.process = None
-            self.log.debug("Node stopped")
-            return True
-        return False
+        if return_code is None:
+            return False
+
+        # process has stopped. Assert that it didn't return an error code.
+        assert_equal(return_code, 0)
+        self.running = False
+        self.process = None
+        self.rpc_connected = False
+        self.rpc = None
+        self.log.debug("Node stopped")
+        return True
+
+    def wait_until_stopped(self, timeout=BITCOIND_PROC_WAIT_TIMEOUT):
+        wait_until(self.is_node_stopped, timeout=timeout)
 
     def node_encrypt_wallet(self, passphrase):
         """"Encrypts the wallet.
@@ -140,10 +149,7 @@ class TestNode():
         This causes bitcoind to shutdown, so this method takes
         care of cleaning up resources."""
         self.encryptwallet(passphrase)
-        while not self.is_node_stopped():
-            time.sleep(0.1)
-        self.rpc = None
-        self.rpc_connected = False
+        self.wait_until_stopped()
 
 class TestNodeCLI():
     """Interface to bitcoin-cli for an individual node"""