Use the build system “meson” (close #32)

Replace the build system “setuptools” with “meson”.

src/zeroconf.py

@@ -0,0 +1,66 @@
+#!/usr/bin/env python3
+
+
+import gi
+try:
+    gi.require_version('Avahi', '0.6')
+    from gi.repository import Avahi
+    use_avahi = True
+except:
+    use_avahi = False
+import logging
+
+from mcg import client
+
+
+
+
+class ZeroconfProvider(client.Base):
+    KEYRING_SYSTEM = 'mcg'
+    KEYRING_USERNAME = 'mpd'
+    SIGNAL_SERVICE_NEW = 'service-new'
+    TYPE = '_mpd._tcp'
+
+
+    def __init__(self):
+        client.Base.__init__(self)
+        self._service_resolvers = []
+        self._services = {}
+        self._logger = logging.getLogger(__name__)
+        # Client
+        if use_avahi:
+            self._start_client()
+
+
+    def on_new_service(self, browser, interface, protocol, name, type, domain, flags):
+        #if not (flags & Avahi.LookupResultFlags.GA_LOOKUP_RESULT_LOCAL):
+        service_resolver = Avahi.ServiceResolver(interface=interface, protocol=protocol, name=name, type=type, domain=domain, aprotocol=Avahi.Protocol.GA_PROTOCOL_UNSPEC, flags=0,)
+        service_resolver.connect('found', self.on_found)
+        service_resolver.connect('failure', self.on_failure)
+        service_resolver.attach(self._client)
+        self._service_resolvers.append(service_resolver)
+
+
+    def on_found(self, resolver, interface, protocol, name, type, domain, host, date, port, *args):
+        if (host, port) not in self._services.keys():
+            service = (name,host,port)
+            self._services[(host,port)] = service
+            self._callback(ZeroconfProvider.SIGNAL_SERVICE_NEW, service)
+
+
+    def on_failure(self, resolver, date):
+        if resolver in self._service_resolvers:
+            self._service_resolvers.remove(resolver)
+
+
+    def _start_client(self):
+        self._logger.info("Starting Avahi client")
+        self._client = Avahi.Client(flags=0,)
+        try:
+            self._client.start()
+            # Browser
+            self._service_browser = Avahi.ServiceBrowser(domain='local', flags=0, interface=-1, protocol=Avahi.Protocol.GA_PROTOCOL_UNSPEC, type=ZeroconfProvider.TYPE)
+            self._service_browser.connect('new_service', self.on_new_service)
+            self._service_browser.attach(self._client)
+        except Exception as e:
+            self._logger.info(e)