Consistent loop.getaddrinfo() API

* ai_canonname is different across libc impls (#494)
* AddressFamily and SocketKind can be enums
* Also fixed failing test

tests/test_dns.py

@@ -130,10 +130,14 @@ def test_getaddrinfo_18(self):
     def test_getaddrinfo_19(self):
         self._test_getaddrinfo('::1', 80)
         self._test_getaddrinfo('::1', 80, type=socket.SOCK_STREAM)
+        self._test_getaddrinfo('::1', 80, type=socket.SOCK_STREAM,
+                               flags=socket.AI_CANONNAME)
 
     def test_getaddrinfo_20(self):
         self._test_getaddrinfo('127.0.0.1', 80)
         self._test_getaddrinfo('127.0.0.1', 80, type=socket.SOCK_STREAM)
+        self._test_getaddrinfo('127.0.0.1', 80, type=socket.SOCK_STREAM,
+                               flags=socket.AI_CANONNAME)
 
     ######
 

tests/test_tcp.py

@@ -222,7 +222,7 @@ def test_create_server_4(self):
 
             with self.assertRaisesRegex(OSError,
                                         r"error while attempting.*\('127.*: "
-                                        r"address already in use"):
+                                        r"address( already)? in use"):
 
                 self.loop.run_until_complete(
                     self.loop.create_server(object, *addr))

uvloop/dns.pyx

@@ -224,6 +224,17 @@ cdef __static_getaddrinfo(object host, object port,
             return (family, type, proto)
 
 
+# This bitmask is used in __static_getaddrinfo_pyaddr() to manage
+# if ai_canonname should be set if AI_CANONNAME flag is set.
+# This bitmask is lazily set in loop.getaddrinfo() to make sure that
+# __static_getaddrinfo_pyaddr() behaves consistently as libc getaddrinfo().
+# 1 << 0 : If 1 << 1 is set
+# 1 << 1 : If ai_canonname should be set if AI_CANONNAME is set
+# 1 << 2 : If 1 << 3 is set
+# 1 << 3 : If ai_canonname should be set if AI_CANONNAME is not set
+cdef int __static_getaddrinfo_canonname_mode = 0
+
+
 cdef __static_getaddrinfo_pyaddr(object host, object port,
                                  int family, int type,
                                  int proto, int flags):
@@ -245,7 +256,20 @@ cdef __static_getaddrinfo_pyaddr(object host, object port,
     except Exception:
         return
 
-    return af, type, proto, '', pyaddr
+    if __static_getaddrinfo_canonname_mode & (
+        1 << 1 if flags & socket_AI_CANONNAME else 1 << 3
+    ):
+        if isinstance(host, (bytes, bytearray)):
+            host = host.decode('ascii')
+    else:
+        host = ''
+    return (
+        _intenum_converter(af, socket_AddressFamily),
+        _intenum_converter(type, socket_SocketKind),
+        proto,
+        host,
+        pyaddr,
+    )
 
 
 @cython.freelist(DEFAULT_FREELIST_SIZE)
@@ -276,8 +300,8 @@ cdef class AddrInfo:
         while ptr != NULL:
             if ptr.ai_addr.sa_family in (uv.AF_INET, uv.AF_INET6):
                 result.append((
-                    ptr.ai_family,
-                    ptr.ai_socktype,
+                    _intenum_converter(ptr.ai_family, socket_AddressFamily),
+                    _intenum_converter(ptr.ai_socktype, socket_SocketKind),
                     ptr.ai_protocol,
                     ('' if ptr.ai_canonname is NULL else
                         (<bytes>ptr.ai_canonname).decode()),
@@ -370,6 +394,13 @@ cdef class NameInfoRequest(UVRequest):
             self.callback(convert_error(err))
 
 
+cdef _intenum_converter(value, enum_klass):
+    try:
+        return enum_klass(value)
+    except ValueError:
+        return value
+
+
 cdef void __on_addrinfo_resolved(uv.uv_getaddrinfo_t *resolver,
                                  int status, system.addrinfo *res) with gil:
 

uvloop/includes/stdlib.pxi

@@ -72,6 +72,7 @@ cdef int has_SO_REUSEPORT = hasattr(socket, 'SO_REUSEPORT')
 cdef int SO_REUSEPORT = getattr(socket, 'SO_REUSEPORT', 0)
 cdef int SO_BROADCAST = getattr(socket, 'SO_BROADCAST')
 cdef int SOCK_NONBLOCK = getattr(socket, 'SOCK_NONBLOCK', -1)
+cdef int socket_AI_CANONNAME = getattr(socket, 'AI_CANONNAME')
 
 cdef socket_gaierror = socket.gaierror
 cdef socket_error = socket.error

uvloop/loop.pyx

@@ -1523,13 +1523,31 @@ cdef class Loop:
     @cython.iterable_coroutine
     async def getaddrinfo(self, object host, object port, *,
                           int family=0, int type=0, int proto=0, int flags=0):
+        global __static_getaddrinfo_canonname_mode
 
         addr = __static_getaddrinfo_pyaddr(host, port, family,
                                            type, proto, flags)
         if addr is not None:
-            fut = self._new_future()
-            fut.set_result([addr])
-            return await fut
+            if __static_getaddrinfo_canonname_mode & (
+                1 << 0 if flags & socket_AI_CANONNAME else 1 << 2
+            ):
+                return [addr]
+
+            rv = await self._getaddrinfo(
+                host, port, family, type, proto, flags, 1)
+
+            if flags & socket_AI_CANONNAME:
+                if rv[0][3]:
+                    __static_getaddrinfo_canonname_mode |= 1 << 0 | 1 << 1
+                else:
+                    __static_getaddrinfo_canonname_mode |= 1 << 0
+            else:
+                if rv[0][3]:
+                    __static_getaddrinfo_canonname_mode |= 1 << 2 | 1 << 3
+                else:
+                    __static_getaddrinfo_canonname_mode |= 1 << 2
+
+            return rv
 
         return await self._getaddrinfo(
             host, port, family, type, proto, flags, 1)