143 lines
4.6 KiB
Python
143 lines
4.6 KiB
Python
from __future__ import annotations
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import asyncio
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import base64
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from typing import Any, Protocol
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import httpx
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from .settings import Settings
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class SparqlEngine(Protocol):
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name: str
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async def startup(self) -> None: ...
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async def shutdown(self) -> None: ...
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async def query_json(self, query: str) -> dict[str, Any]: ...
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class AnzoGraphEngine:
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name = "anzograph"
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def __init__(self, *, settings: Settings):
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self.endpoint = settings.effective_sparql_endpoint()
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self.timeout_s = settings.sparql_timeout_s
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self.ready_retries = settings.sparql_ready_retries
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self.ready_delay_s = settings.sparql_ready_delay_s
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self.ready_timeout_s = settings.sparql_ready_timeout_s
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self.user = settings.sparql_user
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self.password = settings.sparql_pass
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self.data_file = settings.sparql_data_file
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self.graph_iri = settings.sparql_graph_iri
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self.load_on_start = settings.sparql_load_on_start
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self.clear_on_start = settings.sparql_clear_on_start
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self._client: httpx.AsyncClient | None = None
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self._auth_header = self._build_auth_header(self.user, self.password)
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@staticmethod
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def _build_auth_header(user: str | None, password: str | None) -> str | None:
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if not user or not password:
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return None
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token = base64.b64encode(f"{user}:{password}".encode("utf-8")).decode("ascii")
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return f"Basic {token}"
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async def startup(self) -> None:
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self._client = httpx.AsyncClient(timeout=self.timeout_s)
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await self._wait_ready()
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if self.clear_on_start:
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await self._update("CLEAR ALL")
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await self._wait_ready()
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if self.load_on_start:
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if not self.data_file:
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raise RuntimeError("SPARQL_LOAD_ON_START=true but SPARQL_DATA_FILE is not set")
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if self.graph_iri:
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await self._update(f"LOAD <{self.data_file}> INTO GRAPH <{self.graph_iri}>")
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else:
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await self._update(f"LOAD <{self.data_file}>")
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# AnzoGraph may still be indexing after LOAD.
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await self._wait_ready()
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async def shutdown(self) -> None:
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if self._client is not None:
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await self._client.aclose()
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self._client = None
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async def query_json(self, query: str) -> dict[str, Any]:
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if self._client is None:
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raise RuntimeError("AnzoGraphEngine not started")
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headers = {
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"Content-Type": "application/x-www-form-urlencoded",
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"Accept": "application/sparql-results+json",
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}
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if self._auth_header:
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headers["Authorization"] = self._auth_header
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# AnzoGraph expects x-www-form-urlencoded with `query=...`.
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resp = await self._client.post(
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self.endpoint,
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headers=headers,
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data={"query": query},
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)
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resp.raise_for_status()
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return resp.json()
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async def _update(self, update: str) -> None:
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if self._client is None:
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raise RuntimeError("AnzoGraphEngine not started")
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headers = {
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"Content-Type": "application/sparql-update",
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"Accept": "application/json",
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}
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if self._auth_header:
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headers["Authorization"] = self._auth_header
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resp = await self._client.post(self.endpoint, headers=headers, content=update)
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resp.raise_for_status()
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async def _wait_ready(self) -> None:
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if self._client is None:
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raise RuntimeError("AnzoGraphEngine not started")
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# Match the repo's Julia readiness gate: real SPARQL POST + valid JSON parse.
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headers = {
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"Content-Type": "application/x-www-form-urlencoded",
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"Accept": "application/sparql-results+json",
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}
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if self._auth_header:
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headers["Authorization"] = self._auth_header
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last_err: Exception | None = None
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for _ in range(self.ready_retries):
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try:
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resp = await self._client.post(
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self.endpoint,
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headers=headers,
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data={"query": "ASK WHERE { ?s ?p ?o }"},
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timeout=self.ready_timeout_s,
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)
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resp.raise_for_status()
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# Ensure it's JSON, not HTML/text during boot.
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resp.json()
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return
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except Exception as e:
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last_err = e
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await asyncio.sleep(self.ready_delay_s)
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raise RuntimeError(f"AnzoGraph not ready at {self.endpoint}") from last_err
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def create_sparql_engine(settings: Settings) -> SparqlEngine:
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return AnzoGraphEngine(settings=settings)
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