prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Does the framework support IPv6 networks?
  Is this framework suitable for IPv6 network environment? 
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `src/syft/grid/example_nodes/network.py`
  Content:
  ```
  1 """
  2 The purpose of this application is to allow us to dev and test PySyft
  3 functionality on an actual local network. This is NOT meant to be run in
  4 production (that's the *actual* grid's job).
  5 
  6 For example:
  7 $ python src/syft/grid/example_nodes/network.py
  8 
  9 """
  10 # stdlib
  11 import os
  12 
  13 # third party
  14 import flask
  15 from flask import Flask
  16 from flask import Response
  17 from nacl.encoding import HexEncoder
  18 
  19 # syft absolute
  20 from syft.core.common.message import SignedImmediateSyftMessageWithReply
  21 from syft.core.common.message import SignedImmediateSyftMessageWithoutReply
  22 from syft.core.common.serde.deserialize import _deserialize
  23 from syft.core.node.network.network import Network
  24 from syft.grid.services.signaling_service import PullSignalingService
  25 from syft.grid.services.signaling_service import PushSignalingService
  26 from syft.grid.services.signaling_service import RegisterDuetPeerService
  27 
  28 app = Flask(__name__)
  29 
  30 network = Network(name="om-net")
  31 
  32 network.immediate_services_without_reply.append(PushSignalingService)
  33 network.immediate_services_with_reply.append(PullSignalingService)
  34 network.immediate_services_with_reply.append(RegisterDuetPeerService)
  35 network._register_services()  # re-register all services including SignalingService
  36 
  37 
  38 @app.route("/metadata")
  39 def get_metadata() -> flask.Response:
  40     metadata = network.get_metadata_for_client()
  41     metadata_proto = metadata.serialize()
  42     r = Response(
  43         response=metadata_proto.SerializeToString(),
  44         status=200,
  45     )
  46     r.headers["Content-Type"] = "application/octet-stream"
  47     return r
  48 
  49 
  50 @app.route("/", methods=["POST"])
  51 def process_network_msgs() -> flask.Response:
  52     data = flask.request.get_data()
  53     obj_msg = _deserialize(blob=data, from_bytes=True)
  54     if isinstance(obj_msg, SignedImmediateSyftMessageWithReply):
  55         print(
  56             f"Signaling server SignedImmediateSyftMessageWithReply: {obj_msg.message} watch"
  57         )
  58         reply = network.recv_immediate_msg_with_reply(msg=obj_msg)
  59         r = Response(response=reply.serialize(to_bytes=True), status=200)
  60         r.headers["Content-Type"] = "application/octet-stream"
  61         return r
  62     elif isinstance(obj_msg, SignedImmediateSyftMessageWithoutReply):
  63         print(
  64             f"Signaling server SignedImmediateSyftMessageWithoutReply: {obj_msg.message} watch"
  65         )
  66         network.recv_immediate_msg_without_reply(msg=obj_msg)
  67         r = Response(status=200)
  68         return r
  69     else:
  70         print(
  71             f"Signaling server SignedImmediateSyftMessageWithoutReply: {obj_msg.message} watch"
  72         )
  73         network.recv_eventual_msg_without_reply(msg=obj_msg)
  74         r = Response(status=200)
  75         return r
  76 
  77 
  78 def run() -> None:
  79     global network
  80     print("====================================")
  81     print("========== NODE ROOT KEY ===========")
  82     print("====================================")
  83     # this signing_key is to aid in local development and is not used in the real
  84     # PyGrid implementation
  85     PORT = os.getenv("PORT", 5000)
  86     print(f"Starting Node on PORT: {PORT}")
  87     print(network.signing_key.encode(encoder=HexEncoder).decode("utf-8"), "\n")
  88     app.run(host="0.0.0.0", port=int(PORT))  # nosec
  89 
  90 
  91 run()
  92
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/src/syft/grid/example_nodes/network.py b/src/syft/grid/example_nodes/network.py
  --- a/src/syft/grid/example_nodes/network.py
  +++ b/src/syft/grid/example_nodes/network.py
  @@ -9,6 +9,7 @@
   """
   # stdlib
   import os
  +import sys
   
   # third party
   import flask
  @@ -77,15 +78,25 @@
   
   def run() -> None:
       global network
  -    print("====================================")
  -    print("========== NODE ROOT KEY ===========")
  -    print("====================================")
  +
  +    IP_MODE = os.getenv("IP_MODE", "IPV4")  # default to ipv4
  +    if len(sys.argv) > 1:
  +        IP_MODE = sys.argv[1]
  +
  +    IP_MODE = "IPV6" if IP_MODE == "IPV6" else "IPV4"
       # this signing_key is to aid in local development and is not used in the real
       # PyGrid implementation
  +    HOST = "0.0.0.0" if IP_MODE == "IPV4" else "::"  # nosec
       PORT = os.getenv("PORT", 5000)
  -    print(f"Starting Node on PORT: {PORT}")
  +
  +    print("====================================")
  +    print("========== NODE ROOT KEY ===========")
  +    print("====================================")
       print(network.signing_key.encode(encoder=HexEncoder).decode("utf-8"), "\n")
  -    app.run(host="0.0.0.0", port=int(PORT))  # nosec
  +
  +    print(f"Using {IP_MODE} and listening on port {PORT}")
  +
  +    app.run(host=HOST, port=int(PORT))
   
   
   run()
  
verification_info: {"golden_diff": "diff --git a/src/syft/grid/example_nodes/network.py b/src/syft/grid/example_nodes/network.py\n--- a/src/syft/grid/example_nodes/network.py\n+++ b/src/syft/grid/example_nodes/network.py\n@@ -9,6 +9,7 @@\n \"\"\"\n # stdlib\n import os\n+import sys\n \n # third party\n import flask\n@@ -77,15 +78,25 @@\n \n def run() -> None:\n     global network\n-    print(\"====================================\")\n-    print(\"========== NODE ROOT KEY ===========\")\n-    print(\"====================================\")\n+\n+    IP_MODE = os.getenv(\"IP_MODE\", \"IPV4\")  # default to ipv4\n+    if len(sys.argv) > 1:\n+        IP_MODE = sys.argv[1]\n+\n+    IP_MODE = \"IPV6\" if IP_MODE == \"IPV6\" else \"IPV4\"\n     # this signing_key is to aid in local development and is not used in the real\n     # PyGrid implementation\n+    HOST = \"0.0.0.0\" if IP_MODE == \"IPV4\" else \"::\"  # nosec\n     PORT = os.getenv(\"PORT\", 5000)\n-    print(f\"Starting Node on PORT: {PORT}\")\n+\n+    print(\"====================================\")\n+    print(\"========== NODE ROOT KEY ===========\")\n+    print(\"====================================\")\n     print(network.signing_key.encode(encoder=HexEncoder).decode(\"utf-8\"), \"\\n\")\n-    app.run(host=\"0.0.0.0\", port=int(PORT))  # nosec\n+\n+    print(f\"Using {IP_MODE} and listening on port {PORT}\")\n+\n+    app.run(host=HOST, port=int(PORT))\n \n \n run()\n", "issue": "Does the framework support IPv6 networks?\nIs this framework suitable for IPv6 network environment? \n", "before_files": [{"content": "\"\"\"\nThe purpose of this application is to allow us to dev and test PySyft\nfunctionality on an actual local network. This is NOT meant to be run in\nproduction (that's the *actual* grid's job).\n\nFor example:\n$ python src/syft/grid/example_nodes/network.py\n\n\"\"\"\n# stdlib\nimport os\n\n# third party\nimport flask\nfrom flask import Flask\nfrom flask import Response\nfrom nacl.encoding import HexEncoder\n\n# syft absolute\nfrom syft.core.common.message import SignedImmediateSyftMessageWithReply\nfrom syft.core.common.message import SignedImmediateSyftMessageWithoutReply\nfrom syft.core.common.serde.deserialize import _deserialize\nfrom syft.core.node.network.network import Network\nfrom syft.grid.services.signaling_service import PullSignalingService\nfrom syft.grid.services.signaling_service import PushSignalingService\nfrom syft.grid.services.signaling_service import RegisterDuetPeerService\n\napp = Flask(__name__)\n\nnetwork = Network(name=\"om-net\")\n\nnetwork.immediate_services_without_reply.append(PushSignalingService)\nnetwork.immediate_services_with_reply.append(PullSignalingService)\nnetwork.immediate_services_with_reply.append(RegisterDuetPeerService)\nnetwork._register_services()  # re-register all services including SignalingService\n\n\n@app.route(\"/metadata\")\ndef get_metadata() -> flask.Response:\n    metadata = network.get_metadata_for_client()\n    metadata_proto = metadata.serialize()\n    r = Response(\n        response=metadata_proto.SerializeToString(),\n        status=200,\n    )\n    r.headers[\"Content-Type\"] = \"application/octet-stream\"\n    return r\n\n\n@app.route(\"/\", methods=[\"POST\"])\ndef process_network_msgs() -> flask.Response:\n    data = flask.request.get_data()\n    obj_msg = _deserialize(blob=data, from_bytes=True)\n    if isinstance(obj_msg, SignedImmediateSyftMessageWithReply):\n        print(\n            f\"Signaling server SignedImmediateSyftMessageWithReply: {obj_msg.message} watch\"\n        )\n        reply = network.recv_immediate_msg_with_reply(msg=obj_msg)\n        r = Response(response=reply.serialize(to_bytes=True), status=200)\n        r.headers[\"Content-Type\"] = \"application/octet-stream\"\n        return r\n    elif isinstance(obj_msg, SignedImmediateSyftMessageWithoutReply):\n        print(\n            f\"Signaling server SignedImmediateSyftMessageWithoutReply: {obj_msg.message} watch\"\n        )\n        network.recv_immediate_msg_without_reply(msg=obj_msg)\n        r = Response(status=200)\n        return r\n    else:\n        print(\n            f\"Signaling server SignedImmediateSyftMessageWithoutReply: {obj_msg.message} watch\"\n        )\n        network.recv_eventual_msg_without_reply(msg=obj_msg)\n        r = Response(status=200)\n        return r\n\n\ndef run() -> None:\n    global network\n    print(\"====================================\")\n    print(\"========== NODE ROOT KEY ===========\")\n    print(\"====================================\")\n    # this signing_key is to aid in local development and is not used in the real\n    # PyGrid implementation\n    PORT = os.getenv(\"PORT\", 5000)\n    print(f\"Starting Node on PORT: {PORT}\")\n    print(network.signing_key.encode(encoder=HexEncoder).decode(\"utf-8\"), \"\\n\")\n    app.run(host=\"0.0.0.0\", port=int(PORT))  # nosec\n\n\nrun()\n", "path": "src/syft/grid/example_nodes/network.py"}], "after_files": [{"content": "\"\"\"\nThe purpose of this application is to allow us to dev and test PySyft\nfunctionality on an actual local network. This is NOT meant to be run in\nproduction (that's the *actual* grid's job).\n\nFor example:\n$ python src/syft/grid/example_nodes/network.py\n\n\"\"\"\n# stdlib\nimport os\nimport sys\n\n# third party\nimport flask\nfrom flask import Flask\nfrom flask import Response\nfrom nacl.encoding import HexEncoder\n\n# syft absolute\nfrom syft.core.common.message import SignedImmediateSyftMessageWithReply\nfrom syft.core.common.message import SignedImmediateSyftMessageWithoutReply\nfrom syft.core.common.serde.deserialize import _deserialize\nfrom syft.core.node.network.network import Network\nfrom syft.grid.services.signaling_service import PullSignalingService\nfrom syft.grid.services.signaling_service import PushSignalingService\nfrom syft.grid.services.signaling_service import RegisterDuetPeerService\n\napp = Flask(__name__)\n\nnetwork = Network(name=\"om-net\")\n\nnetwork.immediate_services_without_reply.append(PushSignalingService)\nnetwork.immediate_services_with_reply.append(PullSignalingService)\nnetwork.immediate_services_with_reply.append(RegisterDuetPeerService)\nnetwork._register_services()  # re-register all services including SignalingService\n\n\n@app.route(\"/metadata\")\ndef get_metadata() -> flask.Response:\n    metadata = network.get_metadata_for_client()\n    metadata_proto = metadata.serialize()\n    r = Response(\n        response=metadata_proto.SerializeToString(),\n        status=200,\n    )\n    r.headers[\"Content-Type\"] = \"application/octet-stream\"\n    return r\n\n\n@app.route(\"/\", methods=[\"POST\"])\ndef process_network_msgs() -> flask.Response:\n    data = flask.request.get_data()\n    obj_msg = _deserialize(blob=data, from_bytes=True)\n    if isinstance(obj_msg, SignedImmediateSyftMessageWithReply):\n        print(\n            f\"Signaling server SignedImmediateSyftMessageWithReply: {obj_msg.message} watch\"\n        )\n        reply = network.recv_immediate_msg_with_reply(msg=obj_msg)\n        r = Response(response=reply.serialize(to_bytes=True), status=200)\n        r.headers[\"Content-Type\"] = \"application/octet-stream\"\n        return r\n    elif isinstance(obj_msg, SignedImmediateSyftMessageWithoutReply):\n        print(\n            f\"Signaling server SignedImmediateSyftMessageWithoutReply: {obj_msg.message} watch\"\n        )\n        network.recv_immediate_msg_without_reply(msg=obj_msg)\n        r = Response(status=200)\n        return r\n    else:\n        print(\n            f\"Signaling server SignedImmediateSyftMessageWithoutReply: {obj_msg.message} watch\"\n        )\n        network.recv_eventual_msg_without_reply(msg=obj_msg)\n        r = Response(status=200)\n        return r\n\n\ndef run() -> None:\n    global network\n\n    IP_MODE = os.getenv(\"IP_MODE\", \"IPV4\")  # default to ipv4\n    if len(sys.argv) > 1:\n        IP_MODE = sys.argv[1]\n\n    IP_MODE = \"IPV6\" if IP_MODE == \"IPV6\" else \"IPV4\"\n    # this signing_key is to aid in local development and is not used in the real\n    # PyGrid implementation\n    HOST = \"0.0.0.0\" if IP_MODE == \"IPV4\" else \"::\"  # nosec\n    PORT = os.getenv(\"PORT\", 5000)\n\n    print(\"====================================\")\n    print(\"========== NODE ROOT KEY ===========\")\n    print(\"====================================\")\n    print(network.signing_key.encode(encoder=HexEncoder).decode(\"utf-8\"), \"\\n\")\n\n    print(f\"Using {IP_MODE} and listening on port {PORT}\")\n\n    app.run(host=HOST, port=int(PORT))\n\n\nrun()\n", "path": "src/syft/grid/example_nodes/network.py"}]}