Switch from netifaces to ifaddr for get_local_ip (#128)

* Use ifaddr for get_local_ip

..instead of netifaces (now that zeroconf is doing the same).

* Update requirements

..ifaddr instead of netifaces.

* Rework get_local_ip

..factoring cc ip into the guesswork.

* Make get_local_ip ipv agnostic

catt/controllers.py

@@ -96,7 +96,9 @@ def setup_cast(device_name, video_url=None, prep=None, controller=None, ytdl_opt
     if video_url:
         model_name = DEVICES_WITH_TWO_MODEL_NAMES.get(cast.model_name, cast.model_name)
         cc_info = (cast.device.manufacturer, model_name)
-        stream = StreamInfo(video_url, model=cc_info, device_type=cast.cast_type, ytdl_options=ytdl_options)
+        stream = StreamInfo(
+            video_url, model=cc_info, host=cast.host, device_type=cast.cast_type, ytdl_options=ytdl_options
+        )
 
     if controller:
         if controller == "default":

catt/stream_info.py

@@ -1,8 +1,9 @@
+import ipaddress
 import random
 from pathlib import Path
 
 import click
-import netifaces
+import ifaddr
 import youtube_dl
 
 from .util import guess_mime
@@ -32,10 +33,10 @@ class StreamInfoError(Exception):
 
 
 class StreamInfo:
-    def __init__(self, video_url, model=None, device_type=None, ytdl_options=None):
+    def __init__(self, video_url, host=None, model=None, device_type=None, ytdl_options=None):
         if "://" not in video_url:
             self._local_file = video_url
-            self.local_ip = self._get_local_ip()
+            self.local_ip = self._get_local_ip(host)
             self.port = random.randrange(45000, 47000)
             self.is_local_file = True
         else:
@@ -148,9 +149,21 @@ def set_playlist_entry(self, number):
         else:
             raise StreamInfoError("called on non-playlist")
 
-    def _get_local_ip(self):
-        interface = netifaces.gateways()["default"][netifaces.AF_INET][1]
-        return netifaces.ifaddresses(interface)[netifaces.AF_INET][0]["addr"]
+    def _get_local_ip(self, host):
+        for adapter in ifaddr.get_adapters():
+            for adapter_ip in adapter.ips:
+                aip = adapter_ip.ip[0] if isinstance(adapter_ip.ip, tuple) else adapter_ip.ip
+                try:
+                    if not isinstance(ipaddress.ip_address(host), type(ipaddress.ip_address(aip))):
+                        raise ValueError
+                except ValueError:
+                    continue
+                ipt = [(ip, adapter_ip.network_prefix) for ip in (aip, host)]
+                catt_net, cc_net = [ipaddress.ip_network("%s/%s" % ip, strict=False) for ip in ipt]
+                if catt_net == cc_net:
+                    return aip
+                else:
+                    continue
 
     def _get_stream_preinfo(self, video_url):
         try:

setup.py

@@ -13,7 +13,7 @@
 with open("README.rst") as readme_file:
     readme = readme_file.read()
 
-requirements = ["youtube-dl>=2017.3.15", "PyChromecast>=2.3.0", "Click>=5.0", "netifaces>=0.10.7", "requests>=2.18.4"]
+requirements = ["youtube-dl>=2017.3.15", "PyChromecast>=2.3.0", "Click>=5.0", "ifaddr>=0.1.4", "requests>=2.18.4"]
 
 test_requirements = []  # type: ignore