fix(network): scope connectivity cooldown by destination

tests/services/test_connectivity_guard.py

@@ -38,6 +38,26 @@ async def test_connectivity_guard_enters_cooldown_after_threshold():
     assert guard.cooldown_remaining_seconds() > 0
 
 
+async def test_connectivity_guard_scopes_cooldown_to_destination():
+    guard = await ConnectivityGuard.get_instance()
+
+    destination_a = "civitai.com"
+    destination_b = "api.github.com"
+
+    guard.register_network_failure(
+        OSError(errno.ENETUNREACH, "unreachable"),
+        destination_a,
+    )
+    guard.register_network_failure(asyncio.TimeoutError("timeout"), destination_a)
+    guard.register_network_failure(ConnectionRefusedError("refused"), destination_a)
+
+    assert guard.should_block_request(destination_a) is True
+    assert guard.should_block_request(destination_b) is False
+
+    guard.register_success(destination_a)
+    assert guard.should_block_request(destination_a) is False
+
+
 async def test_connectivity_guard_recovers_after_success():
     guard = await ConnectivityGuard.get_instance()
     guard.online = False
@@ -72,3 +92,26 @@ async def test_downloader_short_circuits_all_request_helpers_during_cooldown():
     ok, payload = await downloader.get_response_headers("https://example.invalid")
     assert ok is False
     assert payload == OFFLINE_COOLDOWN_ERROR
+
+
+async def test_downloader_only_short_circuits_requests_for_same_destination():
+    guard = await ConnectivityGuard.get_instance()
+    guard.register_network_failure(
+        OSError(errno.ENETUNREACH, "unreachable"),
+        "example.invalid",
+    )
+    guard.register_network_failure(asyncio.TimeoutError("timeout"), "example.invalid")
+    guard.register_network_failure(
+        ConnectionRefusedError("refused"),
+        "example.invalid",
+    )
+
+    downloader = Downloader()
+    ok, payload = await downloader.make_request("GET", "https://example.invalid")
+    assert ok is False
+    assert payload == OFFLINE_COOLDOWN_ERROR
+
+    assert (
+        guard.should_block_request(downloader._guard_destination("https://example.com"))
+        is False
+    )