Adding support for IPV6 addresses

parsl/curvezmq.py

@@ -160,6 +160,9 @@ def socket(self, socket_type: int, *args, **kwargs) -> zmq.Socket:
             except zmq.ZMQError as e:
                 raise ValueError("Invalid CurveZMQ key format") from e
             sock.setsockopt(zmq.CURVE_SERVER, True)  # Must come before bind
+
+        # This flag enables IPV6 in addition to IPV4
+        sock.setsockopt(zmq.IPV6, True)
         return sock
 
     def term(self):
@@ -202,4 +205,5 @@ def socket(self, socket_type: int, *args, **kwargs) -> zmq.Socket:
                 sock.setsockopt(zmq.CURVE_SERVERKEY, server_public_key)
             except zmq.ZMQError as e:
                 raise ValueError("Invalid CurveZMQ key format") from e
+        sock.setsockopt(zmq.IPV6, True)
         return sock

parsl/executors/high_throughput/executor.py

@@ -86,12 +86,14 @@
 
     address : string
         An address to connect to the main Parsl process which is reachable from the network in which
-        workers will be running. This field expects an IPv4 address (xxx.xxx.xxx.xxx).
+        workers will be running. This field expects an IPv4 address (xxx.xxx.xxx.xxx) (when 
+        enable_ipv6 is not set)
         Most login nodes on clusters have several network interfaces available, only some of which
         can be reached from the compute nodes. This field can be used to limit the executor to listen
         only on a specific interface, and limiting connections to the internal network.
         By default, the executor will attempt to enumerate and connect through all possible addresses.
         Setting an address here overrides the default behavior.
+        If `enable_ipv6` is set, specify an IPv6 address in brackets, for eg: address=[::1]
         default=None
 
     worker_ports : (int, int)
@@ -224,6 +226,10 @@ class HighThroughputExecutor(BlockProviderExecutor, RepresentationMixin, UsageIn
         Parsl will create names as integers starting with 0.
 
         default: empty list
+        
+    enable_ipv6: bool
+        Set this flag to enable communication over IPV6 in addition to IPV4.
+        default: False 
     """
 
     @typeguard.typechecked
@@ -253,7 +259,8 @@ def __init__(self,
                  worker_logdir_root: Optional[str] = None,
                  manager_selector: ManagerSelector = RandomManagerSelector(),
                  block_error_handler: Union[bool, Callable[[BlockProviderExecutor, Dict[str, JobStatus]], None]] = True,
-                 encrypted: bool = False):
+                 encrypted: bool = False,
+                 enable_ipv6: bool = False):
 
         logger.debug("Initializing HighThroughputExecutor")
 
@@ -268,6 +275,13 @@ def __init__(self,
         self.address = address
         self.address_probe_timeout = address_probe_timeout
         self.manager_selector = manager_selector
+        self.enable_ipv6 = enable_ipv6
+        if self.enable_ipv6:
+            # This will force usage of IPV6 for internal communication
+            self._internal_address = "[::1]"
+        else:
+            self._internal_address = "127.0.0.1"
+
         if self.address:
             self.all_addresses = address
         else:
@@ -408,13 +422,13 @@ def start(self):
             )
 
         self.outgoing_q = zmq_pipes.TasksOutgoing(
-            "127.0.0.1", self.interchange_port_range, self.cert_dir
+            self._internal_address, self.interchange_port_range, self.cert_dir
         )
         self.incoming_q = zmq_pipes.ResultsIncoming(
-            "127.0.0.1", self.interchange_port_range, self.cert_dir
+            self._internal_address, self.interchange_port_range, self.cert_dir
         )
         self.command_client = zmq_pipes.CommandClient(
-            "127.0.0.1", self.interchange_port_range, self.cert_dir
+            self._internal_address, self.interchange_port_range, self.cert_dir
         )
 
         self._result_queue_thread = None
@@ -515,7 +529,7 @@ def _start_local_interchange_process(self) -> None:
         get the worker task and result ports that the interchange has bound to.
         """
 
-        interchange_config = {"client_address": "127.0.0.1",
+        interchange_config = {"client_address": self._internal_address,
                               "client_ports": (self.outgoing_q.port,
                                                self.incoming_q.port,
                                                self.command_client.port),

parsl/executors/high_throughput/probe.py

@@ -32,6 +32,7 @@ def probe_addresses(addresses, task_port, timeout=120):
     for addr in addresses:
         socket = context.socket(zmq.DEALER)
         socket.setsockopt(zmq.LINGER, 0)
+        socket.setsockopt(zmq.IPV6, True)
         url = "tcp://{}:{}".format(addr, task_port)
         logger.debug("Trying to connect back on {}".format(url))
         socket.connect(url)

parsl/tests/configs/htex_local.py

@@ -10,6 +10,7 @@ def fresh_config():
         executors=[
             HighThroughputExecutor(
                 label="htex_local",
+                enable_ipv6=True,
                 worker_debug=True,
                 cores_per_worker=1,
                 encrypted=True,