feat(scenarios): 支持场景配置加载与首页展示

apps/scenarios/services.py

@@ -0,0 +1,64 @@
+from pathlib import Path
+
+import yaml
+from django.conf import settings
+
+
+REQUIRED_FIELDS = [
+    ("id",),
+    ("name",),
+    ("description",),
+    ("agent", "role"),
+    ("agent", "goal"),
+    ("agent", "instructions"),
+    ("rag", "enabled"),
+    ("tools",),
+    ("output", "type"),
+    ("audit", "enabled"),
+]
+
+
+class ScenarioNotFound(KeyError):
+    pass
+
+
+class ScenarioValidationError(ValueError):
+    pass
+
+
+def _get_nested(config: dict, path: tuple[str, ...]):
+    value = config
+    for key in path:
+        if not isinstance(value, dict) or key not in value:
+            raise ScenarioValidationError("缺失必填字段: " + ".".join(path))
+        value = value[key]
+    return value
+
+
+def validate_scenario(config: dict) -> dict:
+    for field_path in REQUIRED_FIELDS:
+        _get_nested(config, field_path)
+    return config
+
+
+def _scenario_files() -> list[Path]:
+    config_dir = Path(settings.SCENARIO_CONFIG_DIR)
+    if not config_dir.exists():
+        return []
+    return sorted([*config_dir.glob("*.yaml"), *config_dir.glob("*.yml")])
+
+
+def list_scenarios() -> list[dict]:
+    scenarios = []
+    for path in _scenario_files():
+        with path.open("r", encoding="utf-8") as file:
+            config = yaml.safe_load(file) or {}
+        scenarios.append(validate_scenario(config))
+    return scenarios
+
+
+def get_scenario(scenario_id: str) -> dict:
+    for scenario in list_scenarios():
+        if scenario["id"] == scenario_id:
+            return scenario
+    raise ScenarioNotFound(f"场景不存在: {scenario_id}")