add gather_debug_info and update readme

README.md

@@ -39,43 +39,65 @@ aioupnp [-h] [--debug_logging] [--interface=<interface>] [--gateway_address=<gat
         [--lan_address=<lan_address>] [--timeout=<timeout>]
         [(--<case sensitive m-search header>=<value>)...]
         command [--<arg name>=<arg>]...
-
-If m-search headers are provided as keyword arguments all of the headers to be used must be provided,
-in the order they are to be used. For example:
-
-aioupnp --HOST=239.255.255.250:1900 --MAN=\"ssdp:discover\" --MX=1 --ST=upnp:rootdevice m_search
 ```
 
-### Commands
-    m_search | add_port_mapping | get_port_mapping_by_index | get_redirects | get_specific_port_mapping | delete_port_mapping | get_next_mapping
 
+#### Commands
+* `help`
+* `get_external_ip`
+* `m_search`
+* `add_port_mapping`
+* `get_port_mapping_by_index`
+* `get_redirects`
+* `get_specific_port_mapping`
+* `delete_port_mapping`
+* `get_next_mapping`
+* `gather_debug_info`
 
-### Examples
+#### To get the documentation for a command
+
+    aioupnp help get_external_ip
+
+#### To get the external ip address
 
-#### To get the external ip address from the UPnP gateway
-    
     aioupnp get_external_ip
-    
-#### To set up a TCP port redirect
-    
-    aioupnp add_port_mapping --external_port=1234 --internal_port=1234 --lan_address=<lan_addr> --description=test --protocol=TCP
-    
+
 #### To list the active port mappings on the gateway
 
     aioupnp get_redirects
 
-#### To debug the gateway discovery
+#### To set up a TCP port mapping
+    
+    aioupnp add_port_mapping --external_port=1234 --internal_port=1234 --lan_address=<lan_addr> --description=test --protocol=TCP
+
+#### To delete a TCP port mapping
+
+    aioupnp delete_port_mapping --external_port=1234 --protocol=TCP
+
+#### M-Search headers
+UPnP uses multicast protocol - SSDP - to locate the gateway. Gateway discovery is automatic by default, but you may provide specific headers for the search to use to override automatic discovery.
+
+If m-search headers are provided as keyword arguments then all of the headers to be used must be provided, in the order they are to be used. For example:
+
+    aioupnp --HOST=239.255.255.250:1900 --MAN=\"ssdp:discover\" --MX=1 --ST=upnp:rootdevice m_search
+
+#### Using non-default network interfaces
+By default, the network device will be automatically discovered. The interface may instead be specified with the `--interface`, provided before the command to be run. The gateway used on the interface network may be specified with the `--gateway_address` argument.
+
+    aioupnp --interface=wlp4s0 --gateway_address=192.168.1.6 m_search
+
+## Troubleshooting
+
+#### Debug logging
+To enable verbose debug logging, add the `--debug_logging` argument before the command
 
     aioupnp --debug_logging m_search
 
-#### To debug a gateway on a non default network interface
+#### It really doesn't work
+If aioupnp doesn't work with a device, a debugging report can be collected with `aioupnp gather_debug_info`.
 
-    aioupnp --interface=vmnet1 --debug_logging m_search
+This will attempt to discover the UPnP gateway, and then perform a functionality check where it will request the external address and existing port mappings before attempting to make and remove a port mapping. The final result is the zipped packet dump of these attempts, which allows writing tests replaying it.
 
-#### To debug a gateway on a non default network interface that isn't the router
-
-    aioupnp --interface=vmnet1 --gateway_address=192.168.1.106 --debug_logging m_search
-    
 ## License
 
 This project is MIT licensed. For the full license, see [LICENSE](LICENSE).

aioupnp/gateway.py

@@ -155,7 +155,7 @@ class Gateway:
 
     @classmethod
     async def _try_gateway_from_ssdp(cls, datagram: SSDPDatagram, lan_address: str,
-                                     gateway_address: str, 
+                                     gateway_address: str,
                                      loop: Optional[asyncio.AbstractEventLoop] = None) -> Optional['Gateway']:
         required_commands: typing.List[str] = [
             'AddPortMapping',

aioupnp/upnp.py

@@ -1,6 +1,5 @@
-# import os
-# import zlib
-# import base64
+import zlib
+import base64
 import logging
 import json
 import asyncio
@@ -8,19 +7,18 @@ from typing import Tuple, Dict, List, Union, Optional, Any
 from aioupnp.fault import UPnPError
 from aioupnp.gateway import Gateway
 from aioupnp.interfaces import get_gateway_and_lan_addresses
-from aioupnp.serialization.ssdp import SSDPDatagram
 from aioupnp.commands import GetGenericPortMappingEntryResponse, GetSpecificPortMappingEntryResponse
 
 
 log = logging.getLogger(__name__)
 
 
-# def _encode(x):
-#     if isinstance(x, bytes):
-#         return x.decode()
-#     elif isinstance(x, Exception):
-#         return str(x)
-#     return x
+def _encode(x):
+    if isinstance(x, bytes):
+        return x.decode()
+    elif isinstance(x, Exception):
+        return str(x)
+    return x
 
 
 class UPnP:
@@ -248,22 +246,45 @@ class UPnP:
         await self.add_port_mapping(port, protocol, _internal_port, self.lan_address, description)
         return port
 
-    # @cli
-    # async def debug_gateway(self) -> str:
-    #     return json.dumps({
-    #         "gateway": self.gateway.debug_gateway(),
-    #         "client_address": self.lan_address,
-    #     }, default=_encode, indent=2)
-    #
-    # @property
-    # def zipped_debugging_info(self) -> str:
-    #     return base64.b64encode(zlib.compress(
-    #         json.dumps({
-    #             "gateway": self.gateway.debug_gateway(),
-    #             "client_address": self.lan_address,
-    #         }, default=_encode, indent=2).encode()
-    #     )).decode()
-    #
+    async def gather_debug_info(self) -> str:
+        """
+        Gather debugging information for this gateway, used for generating test cases for devices with errors.
+
+        :return: (str) compressed debugging information
+        """
+
+        try:
+            await self.get_external_ip()
+        except UPnPError:
+            pass
+        try:
+            await self.get_redirects()
+        except UPnPError:
+            pass
+        try:
+            external_port = await self.get_next_mapping(1234, 'TCP', 'aioupnp testing')
+        except UPnPError:
+            external_port = None
+        try:
+            await self.get_redirects()
+        except UPnPError:
+            pass
+        if external_port:
+            try:
+                await self.delete_port_mapping(external_port, 'TCP')
+            except UPnPError:
+                pass
+            try:
+                await self.get_redirects()
+            except UPnPError:
+                pass
+        return base64.b64encode(zlib.compress(
+            json.dumps({
+                "gateway": self.gateway.debug_gateway(),
+                "client_address": self.lan_address,
+            }, default=_encode, indent=2).encode()
+        )).decode()
+
     # @cli
     # async def get_natrsip_status(self) -> Tuple[bool, bool]:
     #     """Returns (NewRSIPAvailable, NewNATEnabled)"""
@@ -362,7 +383,8 @@ cli_commands = [
     'get_redirects',
     'get_specific_port_mapping',
     'delete_port_mapping',
-    'get_next_mapping'
+    'get_next_mapping',
+    'gather_debug_info'
 ]
 
 
@@ -372,7 +394,6 @@ def run_cli(method: str, igd_args: Dict[str, Union[bool, str, int]], lan_address
             loop: Optional[asyncio.AbstractEventLoop] = None) -> None:
 
     kwargs = kwargs or {}
-    igd_args = igd_args
     timeout = int(timeout)
     loop = loop or asyncio.get_event_loop()
     fut: 'asyncio.Future' = loop.create_future()

tests/test_cli.py

@@ -48,7 +48,7 @@ in the order they are to be used. For example:
 
 Commands:
   m_search | get_external_ip | add_port_mapping | get_port_mapping_by_index | get_redirects |
-  get_specific_port_mapping | delete_port_mapping | get_next_mapping
+  get_specific_port_mapping | delete_port_mapping | get_next_mapping | gather_debug_info
 
 For help with a specific command:  aioupnp help <command>
 """