zeroconf: port to Python 3

zeroconf: port to Python 3

Since we're using the source transformer on Python 3, calls into
Zeroconf and return values from it are generally bytes.

But various socket functions require str on Python 3.

This commit contains enough changes to coerce test-paths.t into
passing on Python 3. I suspect there are still a handful of bugs
on Python 3. But the tests do pass.

Differential Revision: https://phab.mercurial-scm.org/D5805

--- a/hgext/zeroconf/__init__.py	Fri Jun 28 16:40:36 2019 -0700
+++ b/hgext/zeroconf/__init__.py	Sat Feb 02 12:07:31 2019 -0800
@@ -34,6 +34,7 @@
     encoding,
     extensions,
     hg,
+    pycompat,
     ui as uimod,
 )
 from mercurial.hgweb import (
@@ -55,7 +56,7 @@
     # finds external-facing interface without sending any packets (Linux)
     try:
         s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
-        s.connect(('1.0.0.1', 0))
+        s.connect((r'1.0.0.1', 0))
         ip = s.getsockname()[0]
         return ip
     except socket.error:
@@ -64,17 +65,17 @@
     # Generic method, sometimes gives useless results
     try:
         dumbip = socket.gethostbyaddr(socket.gethostname())[2][0]
-        if ':' in dumbip:
-            dumbip = '127.0.0.1'
-        if not dumbip.startswith('127.'):
+        if r':' in dumbip:
+            dumbip = r'127.0.0.1'
+        if not dumbip.startswith(r'127.'):
             return dumbip
     except (socket.gaierror, socket.herror):
-        dumbip = '127.0.0.1'
+        dumbip = r'127.0.0.1'
 
     # works elsewhere, but actually sends a packet
     try:
         s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
-        s.connect(('1.0.0.1', 1))
+        s.connect((r'1.0.0.1', 1))
         ip = s.getsockname()[0]
         return ip
     except socket.error:
@@ -86,19 +87,19 @@
     global server, localip
     if not server:
         ip = getip()
-        if ip.startswith('127.'):
+        if ip.startswith(r'127.'):
             # if we have no internet connection, this can happen.
             return
         localip = socket.inet_aton(ip)
         server = Zeroconf.Zeroconf(ip)
 
-    hostname = socket.gethostname().split('.')[0]
-    host = hostname + ".local"
-    name = "%s-%s" % (hostname, name)
+    hostname = socket.gethostname().split(r'.')[0]
+    host = hostname + r".local"
+    name = r"%s-%s" % (hostname, name)
 
     # advertise to browsers
     svc = Zeroconf.ServiceInfo('_http._tcp.local.',
-                               name + '._http._tcp.local.',
+                               pycompat.bytestr(name + r'._http._tcp.local.'),
                                server = host,
                                port = port,
                                properties = {'description': desc,
@@ -108,7 +109,7 @@
 
     # advertise to Mercurial clients
     svc = Zeroconf.ServiceInfo('_hg._tcp.local.',
-                               name + '._hg._tcp.local.',
+                               pycompat.bytestr(name + r'._hg._tcp.local.'),
                                server = host,
                                port = port,
                                properties = {'description': desc,
@@ -158,7 +159,7 @@
 
 def getzcpaths():
     ip = getip()
-    if ip.startswith('127.'):
+    if ip.startswith(r'127.'):
         return
     server = Zeroconf.Zeroconf(ip)
     l = listener()
@@ -166,10 +167,10 @@
     time.sleep(1)
     server.close()
     for value in l.found.values():
-        name = value.name[:value.name.index('.')]
-        url = "http://%s:%s%s" % (socket.inet_ntoa(value.address), value.port,
-                                  value.properties.get("path", "/"))
-        yield "zc-" + name, url
+        name = value.name[:value.name.index(b'.')]
+        url = r"http://%s:%s%s" % (socket.inet_ntoa(value.address), value.port,
+                                   value.properties.get(r"path", r"/"))
+        yield b"zc-" + name, pycompat.bytestr(url)
 
 def config(orig, self, section, key, *args, **kwargs):
     if section == "paths" and key.startswith("zc-"):