Adds connectivity test for SCTP service

This patch adds a new test to check SCTP connectivity from pods.
The 'create_setup_for_service_test' and 'assert_backend_amount_from_pod'
functions were also extended to support SCTP services. The kuryr-sctp
application was also extended to support connection with IPv6 address family.

Partially-Implements: blueprint sctp-support
Change-Id: Ic63a2807238d3d879bb172d74b05bada2399f07f

kuryr_tempest_plugin/config.py

@@ -67,6 +67,8 @@ kuryr_k8s_opts = [
                     "Pods"),
     cfg.BoolOpt("test_udp_services", default=False,
                 help="Whether or not service UDP tests will be running"),
+    cfg.BoolOpt("test_sctp_services", default=False,
+                help="Whether or not service SCTP tests will be running"),
     cfg.BoolOpt("multi_worker_setup", default=False, help="Whether or not we "
                 "have a multi-worker setup"),
     cfg.BoolOpt("cloud_provider", default=False, help="Whether or not a "

kuryr_tempest_plugin/tests/scenario/base.py

@@ -633,8 +633,13 @@ class BaseKuryrScenarioTest(manager.NetworkScenarioTest):
 
         label = label or data_utils.rand_name('kuryr-app')
         for i in range(pod_num):
-            pod_name, pod = cls.create_pod(
-                labels={"app": label}, namespace=namespace)
+            if protocol == "SCTP":
+                pod_name, pod = cls.create_pod(
+                    labels={"app": label}, image='quay.io/kuryr/sctp-demo',
+                    namespace=namespace)
+            else:
+                pod_name, pod = cls.create_pod(
+                    labels={"app": label}, namespace=namespace)
             if cleanup:
                 cls.addClassResourceCleanup(cls.delete_pod, pod_name,
                                             namespace=namespace)
@@ -956,6 +961,20 @@ class BaseKuryrScenarioTest(manager.NetworkScenarioTest):
                 return
             return stdout
 
+        def req_sctp():
+            cmd = "python3 sctp_client.py {} {}".format(
+                server_ip, server_port)
+            pod_cmd = ["/bin/sh", "-c", cmd]
+            stdout, stderr = self.exec_command_in_pod(pod, pod_cmd,
+                                                      namespace=namespace_name,
+                                                      stderr=True)
+            if stderr:
+                LOG.error('Failed to reach service at {}:{} '
+                          'Err: {}'.format(server_ip, server_port, stderr))
+                time.sleep(10)
+                return
+            return stdout
+
         def pred(tester, responses):
             if protocol == 'TCP':
                 unique_resps = set(resp for resp in responses if resp)
@@ -972,6 +991,10 @@ class BaseKuryrScenarioTest(manager.NetworkScenarioTest):
             self.assertIsNotNone(server_port, "server_port must be "
                                               "provided for UDP protocol")
             req = req_udp
+        elif protocol == "SCTP":
+            self.assertIsNotNone(server_port, "server_port must be "
+                                              "provided for SCTP protocol")
+            req = req_sctp
         else:
             LOG.info("Unsupported protocol %s, returning", protocol)
             return
@@ -1322,7 +1345,13 @@ class BaseKuryrScenarioTest(manager.NetworkScenarioTest):
                                                namespace=namespace)
         pod_num = pod_num or self.pod_num
         if not pod_name:
-            pod_name, _ = self.create_pod(namespace=namespace, labels=labels)
+            if protocol == "SCTP":
+                pod_name, _ = self.create_pod(
+                    labels=labels, image='quay.io/kuryr/sctp-demo',
+                    namespace=namespace)
+            else:
+                pod_name, _ = self.create_pod(
+                    namespace=namespace, labels=labels)
             if cleanup:
                 self.addClassResourceCleanup(self.delete_pod, pod_name,
                                              namespace=namespace)

kuryr_tempest_plugin/tests/scenario/test_service.py

@@ -136,3 +136,22 @@ class TestServiceWithoutSelectorScenario(base.BaseKuryrScenarioTest):
         self.service_without_selector_base(namespace=ns_name)
 
         self.check_service_internal_connectivity(namespace=ns_name)
+
+
+class TestSCTPServiceScenario(base.BaseKuryrScenarioTest):
+
+    @classmethod
+    def skip_checks(cls):
+        super(TestSCTPServiceScenario, cls).skip_checks()
+        if not CONF.kuryr_kubernetes.service_tests_enabled:
+            raise cls.skipException("Service tests are not enabled")
+        if not CONF.kuryr_kubernetes.test_sctp_services:
+            raise cls.skipException("Service SCTP tests are not enabled")
+
+    @decorators.idempotent_id('bb8cc977-c867-4766-b623-137d8395cb60')
+    def test_service_sctp_ping(self):
+        self.create_setup_for_service_test(
+            protocol="SCTP", port=90, target_port=9090)
+
+        self.check_service_internal_connectivity(
+            service_port='90', protocol='SCTP')

test_container/kuryr_sctp_demo/sctp_client.py

@@ -15,17 +15,31 @@ import sys
 
 import sctp
 
-sk = sctp.sctpsocket_tcp(socket.AF_INET)
-
 
 def connect_plus_message(out_ip, out_port):
-    sk.connect((out_ip, out_port))
-    print("Sending Message")
-    sk.sctp_send(msg='HELLO, I AM ALIVE!!!')
-    msgFromServer = sk.recvfrom(1024)
-    print(msgFromServer[0].decode('utf-8'))
-    sk.shutdown(0)
-    sk.close()
+    for res in socket.getaddrinfo(out_ip, out_port, socket.AF_UNSPEC,
+                                  socket.SOCK_STREAM, 0, socket.AI_PASSIVE):
+        addr_fam, socktype, proto, canonname, sa = res
+        try:
+            sock = sctp.sctpsocket_tcp(addr_fam)
+        except OSError:
+            sock = None
+            continue
+        try:
+            sock.connect(sa)
+        except OSError:
+            sock.close()
+            sock = None
+            continue
+        break
+
+    if sock:
+        print("Sending Message")
+        sock.sctp_send(msg='HELLO, I AM ALIVE!!!')
+        msg_from_server = sock.recvfrom(1024)
+        print(msg_from_server[0].decode('utf-8'))
+        sock.shutdown(0)
+        sock.close()
 
 
 if __name__ == '__main__':

test_container/kuryr_sctp_demo/sctp_server.py

@@ -11,14 +11,16 @@
 # limitations under the License.
 
 import platform
-import sctp
 import socket
 
+import sctp
 
-host = '0.0.0.0'
+
+host = '::'
 port = 9090
 
-sock = sctp.sctpsocket_tcp(socket.AF_INET)
+sock = sctp.sctpsocket_tcp(socket.AF_INET6)
+sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 0)
 sock.bind((host, port))
 sock.listen(1)