feat(gateway): slot v2 loader (contract C1)

ingestor/io/slots.py

@@ -0,0 +1,25 @@
+"""Parse the slot v2 structure written by the Orchestrator to Redis (contract C1)."""
+
+SERVER_FIELDS = ('server_id', 'url', 'server_uri', 'use_security', 'subscription_period_ms')
+
+
+def _parse_tag(address: str, tag: dict) -> dict:
+    names = tag.get('names')
+    if not names:
+        raise ValueError(f'tag {address!r} has no names')
+    return {
+        'frequency': tag['frequency'],
+        'names': names,
+        'active_read': tag.get('active_read', {'enabled': False}),
+    }
+
+
+def _parse_server(server: dict) -> dict:
+    parsed = {field: server[field] for field in SERVER_FIELDS if field in server}
+    parsed['tags'] = {addr: _parse_tag(addr, tag) for addr, tag in server['tags'].items()}
+    return parsed
+
+
+def parse_slot(raw: dict) -> dict:
+    """Normalize a raw slot v2 dict into `{server_name: {..., tags: {addr: tag}}}`."""
+    return {name: _parse_server(server) for name, server in raw.items()}

tests/unit/io/test_slots.py

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+from ingestor.io.slots import parse_slot
+
+RAW = {'server1': {'server_id': '1', 'url': 'opc.tcp://h:4840', 'use_security': True,
+    'subscription_period_ms': 1000, 'tags': {'ns=2;i=2': {'frequency': '15000',
+    'active_read': {'enabled': True, 'cycle_multiple': 3},
+    'names': [{'collection': 'raw_x', 'tag_name': 'Counter', 'model_name': 'm1', 'model_id': '1'},
+              {'collection': 'raw_y', 'tag_name': 'Contador', 'model_name': 'm2', 'model_id': '2'}]}}}}
+
+
+def test_parse_slot_multi_name():
+    slot = parse_slot(RAW)
+    tag = slot['server1']['tags']['ns=2;i=2']
+    assert len(tag['names']) == 2
+    assert tag['active_read']['cycle_multiple'] == 3
+
+
+def test_parse_slot_defaults_active_read_disabled():
+    raw = {'s': {'server_id': '1', 'url': 'u', 'tags': {'ns=2;i=1': {
+        'frequency': '1000', 'names': [{'collection': 'c', 'tag_name': 't', 'model_name': 'm', 'model_id': '1'}]}}}}
+    tag = parse_slot(raw)['s']['tags']['ns=2;i=1']
+    assert tag['active_read'] == {'enabled': False}
+
+
+def test_parse_slot_rejects_tag_without_names():
+    raw = {'s': {'server_id': '1', 'url': 'u', 'tags': {'ns=2;i=1': {'frequency': '1000'}}}}
+    import pytest
+    with pytest.raises((KeyError, ValueError)):
+        parse_slot(raw)