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"""Generic JSON file-backed database for isolated runtime state."""
from __future__ import annotations
import json
from pathlib import Path
from typing import Any, Callable, Dict, List, Optional
from mcp_servers.utils import safe_copy
class Database:
PK_FIELDS = {
"organization": "org_id",
"user": "user_id",
"warehouse": "warehouse_id",
"dataset": "dataset_id",
"table": "table_id",
"column": "column_id",
"access_grant": "grant_id",
"query_job": "query_job_id",
"import_job": "import_job_id",
"export_job": "export_job_id",
"cost_usage_record": "usage_id",
"quota_policy": "quota_id",
}
FILE_STEMS = {
"organization": "organizations",
"user": "users",
"warehouse": "warehouses",
"dataset": "datasets",
"table": "tables",
"column": "columns",
"access_grant": "access_grants",
"query_job": "query_jobs",
"import_job": "import_jobs",
"export_job": "export_jobs",
"cost_usage_record": "cost_usage_records",
"quota_policy": "quota_policies",
}
SINGULAR_NAMES = {value: key for key, value in FILE_STEMS.items()}
def __init__(self, db_dir: str) -> None:
self.db_dir = Path(db_dir)
self._data: Dict[str, List[Dict[str, Any]]] = {}
def _file(self, entity_type: str) -> Path:
return self.db_dir / f"{self.FILE_STEMS.get(entity_type, entity_type + 's')}.json"
def _pk_field(self, entity_type: str) -> str:
return self.PK_FIELDS.get(entity_type, f"{entity_type}_id")
def _ensure_loaded(self, entity_type: str) -> None:
if entity_type in self._data:
return
path = self._file(entity_type)
if path.exists():
payload = json.loads(path.read_text(encoding="utf-8"))
self._data[entity_type] = payload if isinstance(payload, list) else []
else:
self._data[entity_type] = []
def _flush(self, entity_type: str) -> None:
self.db_dir.mkdir(parents=True, exist_ok=True)
path = self._file(entity_type)
tmp = path.with_suffix(path.suffix + ".tmp")
tmp.write_text(json.dumps(self._data.get(entity_type, []), indent=2, ensure_ascii=False), encoding="utf-8")
tmp.replace(path)
def _ref(self, entity_type: str, entity_id: str) -> Optional[Dict[str, Any]]:
self._ensure_loaded(entity_type)
pk = self._pk_field(entity_type)
for record in self._data[entity_type]:
if record.get(pk) == entity_id or record.get("id") == entity_id:
return record
return None
def get_all(self, entity_type: str) -> List[Dict[str, Any]]:
self._ensure_loaded(entity_type)
return safe_copy(self._data[entity_type])
def get_by_id(self, entity_type: str, entity_id: str) -> Optional[Dict[str, Any]]:
ref = self._ref(entity_type, entity_id)
return safe_copy(ref) if ref is not None else None
def get_one(self, entity_type: str, id_field: str, entity_id: str) -> Optional[Dict[str, Any]]:
found = self.get_by_id(entity_type, entity_id)
if found is not None:
return found
matches = self.query(entity_type, lambda row: row.get(id_field) == entity_id)
return matches[0] if matches else None
def query(self, entity_type: str, predicate: Callable[[Dict[str, Any]], bool]) -> List[Dict[str, Any]]:
self._ensure_loaded(entity_type)
return safe_copy([record for record in self._data[entity_type] if predicate(record)])
def insert(self, entity_type: str, record: Dict[str, Any]) -> Dict[str, Any]:
self._ensure_loaded(entity_type)
stored = safe_copy(record)
self._data[entity_type].append(stored)
self._flush(entity_type)
return safe_copy(stored)
def upsert(self, entity_type: str, arg1: Any, arg2: Any = None) -> Dict[str, Any]:
if isinstance(arg1, dict):
record = safe_copy(arg1)
entity_id = record.get(self._pk_field(entity_type))
else:
entity_id = str(arg1)
record = safe_copy(arg2 if isinstance(arg2, dict) else {})
ref = self._ref(entity_type, str(entity_id))
if ref is None:
return self.insert(entity_type, record)
ref.update(record)
self._flush(entity_type)
return safe_copy(ref)
def update(self, entity_type: str, entity_id: str, patch: Dict[str, Any]) -> Optional[Dict[str, Any]]:
ref = self._ref(entity_type, entity_id)
if ref is None:
return None
ref.update(safe_copy(patch))
self._flush(entity_type)
return safe_copy(ref)
def delete(self, entity_type: str, entity_id: str) -> bool:
self._ensure_loaded(entity_type)
pk = self._pk_field(entity_type)
before = len(self._data[entity_type])
self._data[entity_type] = [row for row in self._data[entity_type] if row.get(pk) != entity_id and row.get("id") != entity_id]
if len(self._data[entity_type]) != before:
self._flush(entity_type)
return True
return False
def delete_many(self, entity_type: str, predicate: Callable[[Dict[str, Any]], bool]) -> int:
self._ensure_loaded(entity_type)
before = len(self._data[entity_type])
self._data[entity_type] = [row for row in self._data[entity_type] if not predicate(row)]
removed = before - len(self._data[entity_type])
if removed:
self._flush(entity_type)
return removed
def save(self, entity_type: str, records: List[Dict[str, Any]]) -> None:
self._data[entity_type] = safe_copy(records)
self._flush(entity_type)
def snapshot(self) -> Dict[str, List[Dict[str, Any]]]:
if self.db_dir.exists():
for path in self.db_dir.glob("*.json"):
self._ensure_loaded(self.SINGULAR_NAMES.get(path.stem, path.stem))
return safe_copy(self._data)
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