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import hashlib
import json
import logging
from pathlib import Path
from ..core.schema import PlanRequest, PlanResponse
from ..core.config import Settings
from ..core.inference.client import HFClient
from ..core.redact import redact
logger = logging.getLogger(__name__)
_PROMPT_TEMPLATE: str | None = None
def _get_prompt_template() -> str:
global _PROMPT_TEMPLATE
if _PROMPT_TEMPLATE is None:
try:
path = Path(__file__).parent.parent / "core/prompts/plan.txt"
_PROMPT_TEMPLATE = path.read_text(encoding="utf-8")
except FileNotFoundError:
logger.error("FATAL: core/prompts/plan.txt not found.")
_PROMPT_TEMPLATE = "Generate a JSON plan with keys: plan_id, steps, risk, explanation."
return _PROMPT_TEMPLATE
def _create_final_prompt(req: PlanRequest) -> str:
template = _get_prompt_template()
context_str = f"Context:\n- app_id: {req.context.app_id}\n- symptoms: {', '.join(req.context.symptoms)}\n- lkg_version: {req.context.lkg or 'N/A'}\n- constraints: max_steps={req.constraints.max_steps}, risk={req.constraints.risk}"
safe_context = redact(context_str)
return f"{template}\n\n{safe_context}\n\nJSON Response:"
def _parse_llm_output(raw_output: str, context_str: str) -> dict:
try:
start = raw_output.find('{')
end = raw_output.rfind('}')
if start != -1 and end != -1 and end > start:
json_str = raw_output[start:end+1]
return json.loads(json_str)
raise ValueError("No valid JSON object found in output.")
except (json.JSONDecodeError, ValueError) as e:
logger.warning(f"LLM output parsing failed: {e}. Applying safe fallback plan.")
return {
"plan_id": hashlib.md5(context_str.encode()).hexdigest()[:12],
"steps": ["Pin to the last-known-good (LKG) version and re-run health probes."],
"risk": "low",
"explanation": "Fallback plan: A safe default was applied due to a model output parsing error."
}
async def generate_plan(req: PlanRequest, settings: Settings) -> PlanResponse:
final_prompt = _create_final_prompt(req)
client = HFClient(model=settings.model.name)
raw_response = await client.generate(
prompt=final_prompt,
max_new_tokens=settings.model.max_new_tokens,
temperature=settings.model.temperature,
)
parsed_data = _parse_llm_output(raw_response, final_prompt)
return PlanResponse.model_validate(parsed_data)
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