Improve host resolver coverage (#583)

aioesphomeapi/host_resolver.py

@@ -7,12 +7,12 @@ from dataclasses import dataclass
 from ipaddress import IPv4Address, IPv6Address
 from typing import Union, cast
 
-import zeroconf
+from zeroconf import IPVersion, Zeroconf
-import zeroconf.asyncio
+from zeroconf.asyncio import AsyncServiceInfo, AsyncZeroconf
 
 from .core import APIConnectionError, ResolveAPIError
 
-ZeroconfInstanceType = Union[zeroconf.Zeroconf, zeroconf.asyncio.AsyncZeroconf, None]
+ZeroconfInstanceType = Union[Zeroconf, AsyncZeroconf, None]
 
 
 @dataclass(frozen=True)
@@ -47,39 +47,38 @@ async def _async_zeroconf_get_service_info(
     service_type: str,
     service_name: str,
     timeout: float,
-) -> "zeroconf.asyncio.AsyncServiceInfo" | None:
+) -> AsyncServiceInfo | None:
     # Use or create zeroconf instance, ensure it's an AsyncZeroconf
+    async_zc_instance: AsyncZeroconf | None = None
     if zeroconf_instance is None:
         try:
-            zc = zeroconf.asyncio.AsyncZeroconf()
+            async_zc_instance = AsyncZeroconf()
         except Exception:
             raise ResolveAPIError(
                 "Cannot start mDNS sockets, is this a docker container without "
                 "host network mode?"
             )
-        do_close = True
+        zc = async_zc_instance.zeroconf
-    elif isinstance(zeroconf_instance, zeroconf.asyncio.AsyncZeroconf):
+    elif isinstance(zeroconf_instance, AsyncZeroconf):
+        zc = zeroconf_instance.zeroconf
+    elif isinstance(zeroconf_instance, Zeroconf):
         zc = zeroconf_instance
-        do_close = False
-    elif isinstance(zeroconf_instance, zeroconf.Zeroconf):
-        zc = zeroconf.asyncio.AsyncZeroconf(zc=zeroconf_instance)
-        do_close = False
     else:
         raise ValueError(
             f"Invalid type passed for zeroconf_instance: {type(zeroconf_instance)}"
         )
 
     try:
-        info = await zc.async_get_service_info(
+        info = AsyncServiceInfo(service_type, service_name)
-            service_type, service_name, int(timeout * 1000)
+        if await info.async_request(zc, int(timeout * 1000)):
-        )
+            return info
     except Exception as exc:
         raise ResolveAPIError(
             f"Error resolving mDNS {service_name} via mDNS: {exc}"
         ) from exc
     finally:
-        if do_close:
+        if async_zc_instance:
-            await zc.async_close()
+            await async_zc_instance.async_close()
     return info
 
 
@@ -101,7 +100,7 @@ async def _async_resolve_host_zeroconf(
         return []
 
     addrs: list[AddrInfo] = []
-    for ip_address in info.ip_addresses_by_version(zeroconf.IPVersion.All):
+    for ip_address in info.ip_addresses_by_version(IPVersion.All):
         is_ipv6 = ip_address.version == 6
         sockaddr: Sockaddr
         if is_ipv6:

tests/test_host_resolver.py

@@ -1,17 +1,21 @@
 import socket
 from ipaddress import ip_address
-
+import asyncio
 import pytest
 from mock import AsyncMock, MagicMock, patch
-
+from zeroconf import DNSCache
+from zeroconf.asyncio import AsyncZeroconf, AsyncServiceInfo
 import aioesphomeapi.host_resolver as hr
 from aioesphomeapi.core import APIConnectionError
 
 
 @pytest.fixture
 def async_zeroconf():
-    with patch("zeroconf.asyncio.AsyncZeroconf") as klass:
+    with patch("aioesphomeapi.host_resolver.AsyncZeroconf") as klass:
-        yield klass.return_value
+        async_zeroconf = klass.return_value
+        async_zeroconf.async_close = AsyncMock()
+        async_zeroconf.zeroconf.cache = DNSCache()
+        yield async_zeroconf
 
 
 @pytest.fixture
@@ -38,31 +42,49 @@ def addr_infos():
 
 
 @pytest.mark.asyncio
-async def test_resolve_host_zeroconf(async_zeroconf, addr_infos):
+async def test_resolve_host_zeroconf(async_zeroconf: AsyncZeroconf, addr_infos):
-    info = MagicMock()
+    info = MagicMock(auto_spec=AsyncServiceInfo)
     info.ip_addresses_by_version.return_value = [
         ip_address(b"\n\x00\x00*"),
         ip_address(b" \x01\r\xb8\x85\xa3\x00\x00\x00\x00\x8a.\x03ps4"),
     ]
-    async_zeroconf.async_get_service_info = AsyncMock(return_value=info)
+    info.async_request = AsyncMock(return_value=True)
-    async_zeroconf.async_close = AsyncMock()
+    with patch("aioesphomeapi.host_resolver.AsyncServiceInfo", return_value=info):
+        ret = await hr._async_resolve_host_zeroconf("asdf", 6052)
 
-    ret = await hr._async_resolve_host_zeroconf("asdf", 6052)
+    info.async_request.assert_called_once()
-
-    async_zeroconf.async_get_service_info.assert_called_once_with(
-        "_esphomelib._tcp.local.", "asdf._esphomelib._tcp.local.", 3000
-    )
     async_zeroconf.async_close.assert_called_once_with()
-
     assert ret == addr_infos
 
 
 @pytest.mark.asyncio
-async def test_resolve_host_zeroconf_empty(async_zeroconf):
+async def test_resolve_host_passed_zeroconf_does_not_close(addr_infos):
-    async_zeroconf.async_get_service_info = AsyncMock(return_value=None)
+    async_zeroconf = AsyncZeroconf(zc=MagicMock())
     async_zeroconf.async_close = AsyncMock()
+    async_zeroconf.zeroconf.cache = DNSCache()
+    info = MagicMock(auto_spec=AsyncServiceInfo)
+    info.ip_addresses_by_version.return_value = [
+        ip_address(b"\n\x00\x00*"),
+        ip_address(b" \x01\r\xb8\x85\xa3\x00\x00\x00\x00\x8a.\x03ps4"),
+    ]
+    info.async_request = AsyncMock(return_value=True)
+    with patch("aioesphomeapi.host_resolver.AsyncServiceInfo", return_value=info):
+        ret = await hr._async_resolve_host_zeroconf(
+            "asdf", 6052, zeroconf_instance=async_zeroconf
+        )
 
-    ret = await hr._async_resolve_host_zeroconf("asdf.local", 6052)
+    info.async_request.assert_called_once()
+    async_zeroconf.async_close.assert_not_called()
+    assert ret == addr_infos
+
+
+@pytest.mark.asyncio
+async def test_resolve_host_zeroconf_empty(async_zeroconf: AsyncZeroconf):
+    with patch(
+        "aioesphomeapi.host_resolver.AsyncServiceInfo.async_request"
+    ) as mock_async_request:
+        ret = await hr._async_resolve_host_zeroconf("asdf.local", 6052)
+    assert mock_async_request.call_count == 1
     assert ret == []