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from __future__ import annotations
import time
from typing import Optional, Dict, Any
from nl2sql.types import StageResult, StageTrace
from adapters.llm.base import LLMProvider
class Generator:
name = "generator"
def __init__(self, llm: LLMProvider) -> None:
self.llm = llm
def run(self, *, user_query: str, schema_preview: str, plan_text: str,
clarify_answers: Optional[Dict[str, Any]] = None) -> StageResult:
t0 = time.perf_counter()
try:
res = self.llm.generate_sql(
user_query=user_query,
schema_preview=schema_preview,
plan_text=plan_text,
clarify_answers=clarify_answers or {}
)
except Exception as e:
return StageResult(ok=False, error=[f"Generator failed: {e}"])
# Expect a 5-tuple
if not isinstance(res, tuple) or len(res) != 5:
return StageResult(ok=False, error=["Generator contract violation: expected 5-tuple (sql, rationale, t_in, t_out, cost)"])
sql, rationale, t_in, t_out, cost = res
# Type/shape checks
if not isinstance(sql, str) or not sql.strip():
return StageResult(ok=False, error=["Generator produced empty or non-string SQL"])
if not sql.lower().lstrip().startswith("select"):
return StageResult(ok=False, error=[f"Generated non-SELECT SQL: {sql}"])
rationale = rationale or "" # safe length
trace = StageTrace(
stage=self.name,
duration_ms=(time.perf_counter() - t0) * 1000.0,
token_in=t_in,
token_out=t_out,
cost_usd=cost,
notes={"rationale_len": len(rationale)},
)
return StageResult(ok=True, data={"sql": sql, "rationale": rationale}, trace=trace)
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