Fix loop.getaddrinfo() and tests (#495)

* ai_canonname always follows the flag AI_CANONNAME in static resolving (#494)
* AddressFamily and SocketKind can be enums
* Also fixed failing test

tests/test_dns.py

@@ -5,12 +5,32 @@
 from uvloop import _testbase as tb
 
 
+def patched_getaddrinfo(*args, **kwargs):
+    # corrected socket.getaddrinfo() behavior: ai_canonname always follows the
+    # flag AI_CANONNAME, even if `host` is an IP
+    rv = []
+    result = socket.getaddrinfo(*args, **kwargs)
+    for af, sk, proto, canon_name, addr in result:
+        if kwargs.get('flags', 0) & socket.AI_CANONNAME:
+            if not canon_name:
+                canon_name = args[0]
+                if not isinstance(canon_name, str):
+                    canon_name = canon_name.decode('ascii')
+        elif canon_name:
+            canon_name = ''
+        rv.append((af, sk, proto, canon_name, addr))
+    return rv
+
+
 class BaseTestDNS:
 
-    def _test_getaddrinfo(self, *args, **kwargs):
+    def _test_getaddrinfo(self, *args, _patch=False, **kwargs):
         err = None
         try:
-            a1 = socket.getaddrinfo(*args, **kwargs)
+            if _patch:
+                a1 = patched_getaddrinfo(*args, **kwargs)
+            else:
+                a1 = socket.getaddrinfo(*args, **kwargs)
         except socket.gaierror as ex:
             err = ex
 
@@ -100,20 +120,36 @@ def test_getaddrinfo_11(self):
         self._test_getaddrinfo(b'example.com', '80', type=socket.SOCK_STREAM)
 
     def test_getaddrinfo_12(self):
+        # musl always returns ai_canonname but we don't
+        patch = self.implementation != 'asyncio'
+
         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,
+                               _patch=patch)
 
     def test_getaddrinfo_13(self):
+        # musl always returns ai_canonname but we don't
+        patch = self.implementation != 'asyncio'
+
         self._test_getaddrinfo(b'127.0.0.1', b'80')
-        self._test_getaddrinfo(b'127.0.0.1', b'80', type=socket.SOCK_STREAM)
+        self._test_getaddrinfo(b'127.0.0.1', b'80', type=socket.SOCK_STREAM,
+                               _patch=patch)
 
     def test_getaddrinfo_14(self):
+        # musl always returns ai_canonname but we don't
+        patch = self.implementation != 'asyncio'
+
         self._test_getaddrinfo(b'127.0.0.1', b'http')
-        self._test_getaddrinfo(b'127.0.0.1', b'http', type=socket.SOCK_STREAM)
+        self._test_getaddrinfo(b'127.0.0.1', b'http', type=socket.SOCK_STREAM,
+                               _patch=patch)
 
     def test_getaddrinfo_15(self):
+        # musl always returns ai_canonname but we don't
+        patch = self.implementation != 'asyncio'
+
         self._test_getaddrinfo('127.0.0.1', 'http')
-        self._test_getaddrinfo('127.0.0.1', 'http', type=socket.SOCK_STREAM)
+        self._test_getaddrinfo('127.0.0.1', 'http', type=socket.SOCK_STREAM,
+                               _patch=patch)
 
     def test_getaddrinfo_16(self):
         self._test_getaddrinfo('localhost', 'http')
@@ -128,12 +164,26 @@ def test_getaddrinfo_18(self):
         self._test_getaddrinfo('localhost', b'http', type=socket.SOCK_STREAM)
 
     def test_getaddrinfo_19(self):
+        # musl always returns ai_canonname while macOS never return for IPs,
+        # but we strictly follow the docs to use the AI_CANONNAME flag
+        patch = self.implementation != 'asyncio'
+
         self._test_getaddrinfo('::1', 80)
-        self._test_getaddrinfo('::1', 80, type=socket.SOCK_STREAM)
+        self._test_getaddrinfo('::1', 80, type=socket.SOCK_STREAM,
+                               _patch=patch)
+        self._test_getaddrinfo('::1', 80, type=socket.SOCK_STREAM,
+                               flags=socket.AI_CANONNAME, _patch=patch)
 
     def test_getaddrinfo_20(self):
+        # musl always returns ai_canonname while macOS never return for IPs,
+        # but we strictly follow the docs to use the AI_CANONNAME flag
+        patch = self.implementation != 'asyncio'
+
         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,
+                               _patch=patch)
+        self._test_getaddrinfo('127.0.0.1', 80, type=socket.SOCK_STREAM,
+                               flags=socket.AI_CANONNAME, _patch=patch)
 
     ######
 

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

@@ -245,7 +245,21 @@ cdef __static_getaddrinfo_pyaddr(object host, object port,
     except Exception:
         return
 
-    return af, type, proto, '', pyaddr
+    if flags & socket_AI_CANONNAME:
+        if isinstance(host, str):
+            canon_name = host
+        else:
+            canon_name = host.decode('ascii')
+    else:
+        canon_name = ''
+
+    return (
+        _intenum_converter(af, socket_AddressFamily),
+        _intenum_converter(type, socket_SocketKind),
+        proto,
+        canon_name,
+        pyaddr,
+    )
 
 
 @cython.freelist(DEFAULT_FREELIST_SIZE)
@@ -276,8 +290,8 @@ 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 +384,13 @@ 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

@@ -1527,9 +1527,7 @@ cdef class Loop:
         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
+            return [addr]
 
         return await self._getaddrinfo(
             host, port, family, type, proto, flags, 1)