114 lines
4.2 KiB
Python
114 lines
4.2 KiB
Python
"""Client per il the DWH esposto via Supabase/PostgREST.
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Incapsula i 10 rpc verificati contro produzione. Errori sempre in italiano e azionabili
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(stile `vectorstore/embeddings.py`). Lettura sola: l'API ammette solo SELECT/WITH.
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"""
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import requests
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from tht.config import RestConfig
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class RestError(Exception):
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"""Errore di accesso al DWH via REST, con messaggio leggibile per il reviewer."""
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class RestClient:
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def __init__(self, cfg: RestConfig):
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self.cfg = cfg
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self._base = cfg.base_url.rstrip("/")
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# -- trasporto -----------------------------------------------------------------
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def _post(self, fn: str, args: dict) -> requests.Response:
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url = f"{self._base}/rpc/{fn}"
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verify: bool | str = self.cfg.ssl_ca if self.cfg.ssl_ca else True
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try:
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return requests.post(
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url,
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json=args,
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headers={"X-API-Key": self.cfg.api_key},
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timeout=(self.cfg.connect_timeout, self.cfg.timeout),
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verify=verify,
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)
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except requests.RequestException as e:
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raise RestError(
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f"DWH REST non raggiungibile su {self.cfg.base_url} (rpc {fn}): {e}"
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) from e
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def _error_msg(self, fn: str, resp: requests.Response) -> str:
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try:
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body = resp.json()
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detail = body.get("message") or body.get("details") or resp.text
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except (requests.exceptions.JSONDecodeError, AttributeError, TypeError):
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detail = resp.text
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return f"DWH REST rpc {fn} → HTTP {resp.status_code}: {detail}"
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def _call(self, fn: str, args: dict):
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resp = self._post(fn, args)
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if not resp.ok:
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raise RestError(self._error_msg(fn, resp))
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if resp.status_code == 204 or not resp.text:
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return None
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return resp.json()
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# -- rpc -----------------------------------------------------------------------
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def ping(self) -> dict:
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return self._call("ping", {})
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def run_query(self, query_text: str) -> list[dict]:
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"""Esegue una SELECT/WITH e restituisce le righe (read-only lato server)."""
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return self._call("run_query", {"query_text": query_text}) or []
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def explain_query(self, query_text: str) -> list[str]:
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"""EXPLAIN di una SELECT/WITH: ritorna le righe testuali del piano."""
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rows = self._call("explain_query", {"query_text": query_text}) or []
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return [r["line"] for r in rows]
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def validate_select(self, query_text: str) -> bool:
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"""True se la query è una SELECT/WITH accettata, False se è una write."""
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resp = self._post("_validate_select", {"query_text": query_text})
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if resp.status_code == 204:
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return True
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if resp.status_code == 400:
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return False
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raise RestError(self._error_msg("_validate_select", resp))
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def list_tables(self, schema_name: str) -> list[dict]:
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return self._call("list_tables", {"schema_name": schema_name}) or []
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def table_columns(self, schema_name: str, table_name: str) -> list[dict]:
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return self._call(
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"table_columns", {"schema_name": schema_name, "table_name": table_name}
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) or []
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def table_comments(self, schema_name: str, table_name: str) -> list[dict]:
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return self._call(
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"table_comments", {"schema_name": schema_name, "table_name": table_name}
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) or []
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def table_foreign_keys(self, schema_name: str, table_name: str) -> list[dict]:
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return self._call(
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"table_foreign_keys", {"schema_name": schema_name, "table_name": table_name}
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) or []
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def top_values(
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self, schema_name: str, table_name: str, column_name: str, max_values: int
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) -> list[dict]:
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return self._call(
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"top_values",
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{
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"schema_name": schema_name,
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"table_name": table_name,
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"column_name": column_name,
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"max_values": max_values,
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},
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) or []
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def column_stats(self, schema_name: str, table_name: str, column_name: str) -> dict:
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return self._call(
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"column_stats",
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{"schema_name": schema_name, "table_name": table_name, "column_name": column_name},
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)
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