From ee8c1acffae1c378c0e8db8d8270c4b59a998c45 Mon Sep 17 00:00:00 2001
From: Brian Warner <warner@lothar.com>
Date: Fri, 5 Jul 2019 15:47:49 -0700
Subject: [PATCH] dilate/test_full: test reconnection

---
 src/wormhole/test/dilate/test_full.py | 105 +++++++++++++++++++++++++-
 1 file changed, 104 insertions(+), 1 deletion(-)

diff --git a/src/wormhole/test/dilate/test_full.py b/src/wormhole/test/dilate/test_full.py
index 16d990a..50fd3a2 100644
--- a/src/wormhole/test/dilate/test_full.py
+++ b/src/wormhole/test/dilate/test_full.py
@@ -5,7 +5,7 @@ from twisted.internet.defer import Deferred, inlineCallbacks, gatherResults
 from twisted.internet.protocol import Protocol, Factory
 from twisted.trial import unittest
 
-from ..common import ServerBase
+from ..common import ServerBase, poll_until
 from ...eventual import EventualQueue
 from ..._dilation._noise import NoiseConnection
 
@@ -75,3 +75,106 @@ class Full(ServerBase, unittest.TestCase):
         yield w2.close()
 
     test_full.timeout = 30
+
+
+class ReconP(Protocol):
+    def eventually(self, which, data):
+        d = self.factory.deferreds[which]
+        self.factory.eq.fire_eventually(data).addCallback(d.callback)
+    def connectionMade(self):
+        self.eventually("connectionMade", self)
+        #self.transport.write(b"hello\n")
+    def dataReceived(self, data):
+        self.eventually("dataReceived", data)
+    def connectionLost(self, why):
+        self.eventually("connectionLost", (self, why))
+
+class ReconF(Factory):
+    protocol = ReconP
+    def __init__(self, eq):
+        Factory.__init__(self)
+        self.eq = eq
+        self.deferreds = {}
+        for name in ["connectionMade", "dataReceived", "connectionLost"]:
+            self.deferreds[name] = Deferred()
+    def resetDeferred(self, name):
+        d = Deferred()
+        self.deferreds[name] = d
+        return d
+
+class Reconnect(ServerBase, unittest.TestCase):
+    @inlineCallbacks
+    def setUp(self):
+        if not NoiseConnection:
+            raise unittest.SkipTest("noiseprotocol unavailable")
+        # test_welcome wants to see [current_cli_version]
+        yield self._setup_relay(None)
+
+    @inlineCallbacks
+    def test_reconnect(self):
+        eq = EventualQueue(reactor)
+        w1 = wormhole.create(APPID, self.relayurl, reactor, _enable_dilate=True)
+        w2 = wormhole.create(APPID, self.relayurl, reactor, _enable_dilate=True)
+        w1.allocate_code()
+        code = yield w1.get_code()
+        w2.set_code(code)
+        yield doBoth(w1.get_verifier(), w2.get_verifier())
+
+        eps1_d = w1.dilate()
+        eps2_d = w2.dilate()
+        (eps1, eps2) = yield doBoth(eps1_d, eps2_d)
+        (control_ep1, connect_ep1, listen_ep1) = eps1
+        (control_ep2, connect_ep2, listen_ep2) = eps2
+
+        f1 = ReconF(eq); f2 = ReconF(eq)
+        d1 = control_ep1.connect(f1); d2 = control_ep2.connect(f2)
+        yield d1
+        yield d2
+
+        protocols = {}
+        def p_connected(p, index):
+            protocols[index] = p
+            msg = "hello from %s\n" % index
+            p.transport.write(msg.encode("ascii"))
+        f1.deferreds["connectionMade"].addCallback(p_connected, 1)
+        f2.deferreds["connectionMade"].addCallback(p_connected, 2)
+
+        data1 = yield f1.deferreds["dataReceived"]
+        data2 = yield f2.deferreds["dataReceived"]
+        self.assertEqual(data1, b"hello from 2\n")
+        self.assertEqual(data2, b"hello from 1\n")
+        # the ACKs are now in flight and may not arrive before we kill the
+        # connection
+
+        f1.resetDeferred("connectionMade")
+        f2.resetDeferred("connectionMade")
+        d1 = f1.resetDeferred("dataReceived")
+        d2 = f2.resetDeferred("dataReceived")
+
+        # now we reach inside and drop the connection
+        sc = protocols[1].transport
+        orig_connection = sc._manager._connection
+        orig_connection.disconnect()
+
+        # stall until the connection has been replaced
+        yield poll_until(lambda: sc._manager._connection
+                         and (orig_connection != sc._manager._connection))
+
+        # now write some more data, which should travel over the new
+        # connection
+        protocols[1].transport.write(b"more\n")
+        data2 = yield d2
+        self.assertEqual(data2, b"more\n")
+
+        replacement_connection = sc._manager._connection
+        self.assertNotEqual(orig_connection, replacement_connection)
+
+        # the application-visible Protocol should not observe the
+        # interruption
+        self.assertNoResult(f1.deferreds["connectionMade"])
+        self.assertNoResult(f2.deferreds["connectionMade"])
+        self.assertNoResult(f1.deferreds["connectionLost"])
+        self.assertNoResult(f2.deferreds["connectionLost"])
+
+        yield w1.close()
+        yield w2.close()