turnstone/app/rest.py

"""Turnstone REST API — serves REST API and Vue SPA under the /turnstone prefix.

All routes (API + static files) are mounted at /turnstone so the app works
identically whether accessed directly (http://host:8534/turnstone/) or through
Caddy (menagerie.circuitforge.tech/turnstone) without prefix stripping.
"""
from __future__ import annotations

import dataclasses
import os
from pathlib import Path
from typing import Annotated

from fastapi import APIRouter, FastAPI, HTTPException, Query
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse, RedirectResponse
from fastapi.staticfiles import StaticFiles
from pydantic import BaseModel

from app.ingest.pipeline import ensure_schema
from app.services.incidents import (
    create_incident,
    delete_incident,
    get_incident,
    get_incident_entries,
    list_incidents,
)
from app.services.search import (
    search as _search,
    list_sources as _list_sources,
    recent_source_errors as _source_errors,
    format_results,
)

DB_PATH = Path(os.environ.get("TURNSTONE_DB", Path(__file__).parent.parent / "data" / "turnstone.db"))
DIST_DIR = Path(__file__).parent.parent / "web" / "dist"

app = FastAPI(title="Turnstone API", version="0.1.0", docs_url="/turnstone/docs", redoc_url=None)

app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_methods=["GET", "POST", "DELETE"],
    allow_headers=["*"],
)


@app.on_event("startup")
def _startup() -> None:
    ensure_schema(DB_PATH)


class IncidentCreate(BaseModel):
    label: str
    started_at: str | None = None
    ended_at: str | None = None
    notes: str = ""
    severity: str = "medium"

# Serve built Vue assets at the path Vite embeds in index.html.
if (DIST_DIR / "assets").exists():
    app.mount("/turnstone/assets", StaticFiles(directory=str(DIST_DIR / "assets")), name="assets")

# API router — all routes accessible at /turnstone/api/* and /turnstone/health.
router = APIRouter(prefix="/turnstone")


@router.get("/health")
def health() -> dict:
    return {"status": "ok", "db": str(DB_PATH)}


@router.get("/api/search")
def search_logs(
    q: Annotated[str, Query(description="Search query")] = "",
    source: Annotated[str | None, Query(description="Filter by log source ID (partial match)")] = None,
    severity: Annotated[str | None, Query(description="Filter by severity (DEBUG/INFO/WARN/ERROR/CRITICAL)")] = None,
    since: Annotated[str | None, Query(description="ISO timestamp lower bound")] = None,
    until: Annotated[str | None, Query(description="ISO timestamp upper bound")] = None,
    limit: Annotated[int, Query(ge=1, le=500)] = 50,
) -> dict:
    if not q:
        return {"count": 0, "results": []}
    results = _search(
        DB_PATH,
        query=q,
        source_filter=source,
        severity=severity,
        since=since,
        until=until,
        limit=limit,
    )
    return {"count": len(results), "results": [dataclasses.asdict(r) for r in results]}


@router.get("/api/diagnose")
def diagnose(
    q: Annotated[str, Query(description="Service name or problem description")] = "",
    source: Annotated[str | None, Query(description="Limit to a specific source ID (partial match)")] = None,
    since: Annotated[str | None, Query(description="ISO timestamp lower bound")] = None,
    until: Annotated[str | None, Query(description="ISO timestamp upper bound")] = None,
) -> dict:
    if not q:
        return {"count": 0, "results": [], "formatted": ""}

    # Auto-detect source hints: if a query token matches part of a known source_id,
    # use that token as the source_filter so all matching sources (e.g. all
    # rotated plex logs) are included — not just the first matched rotation.
    detected_source = source
    if not detected_source:
        known_sources = [s["source_id"] for s in _list_sources(DB_PATH)]
        q_lower = q.lower()
        for src in known_sources:
            parts = [p for seg in src.split(":") for p in seg.replace("-", " ").replace("_", " ").split()]
            for p in parts:
                if len(p) > 3 and p in q_lower:
                    detected_source = p  # use matched token, not full source_id
                    break
            if detected_source:
                break

    common: dict = dict(source_filter=detected_source, since=since, until=until, include_repeats=False)
    # Broad pass uses OR so any symptom keyword surfaces evidence
    broad = _search(DB_PATH, query=q, limit=15, or_mode=True, **common)
    critical = _search(DB_PATH, query=q, severity="CRITICAL", limit=5, **common)
    errors = _search(DB_PATH, query=q, severity="ERROR", limit=10, **common)

    # When a source was auto-detected, also pull its most recent errors via plain SQL —
    # FTS ranking can bury real errors from the named service if their text doesn't
    # match the symptom keywords. Plain-SQL scan returns actual recent errors regardless.
    source_errors: list = []
    if detected_source and not source and not errors:
        source_errors = _source_errors(
            DB_PATH, source_filter=detected_source, severity="ERROR",
            limit=10, since=since, until=until,
        )
        if not source_errors:
            source_errors = _source_errors(
                DB_PATH, source_filter=detected_source, severity="CRITICAL",
                limit=5, since=since, until=until,
            )

    seen: set[str] = set()
    combined = []
    for r in broad + critical + errors + source_errors:
        if r.entry_id not in seen:
            seen.add(r.entry_id)
            combined.append(r)

    combined.sort(key=lambda r: (r.timestamp_iso or "\xff", r.sequence))
    combined = combined[:20]
    return {
        "count": len(combined),
        "results": [dataclasses.asdict(r) for r in combined],
        "formatted": format_results(combined),
    }


@router.get("/api/sources")
def list_sources() -> dict:
    return {"sources": _list_sources(DB_PATH)}


@router.post("/api/incidents")
def create_incident_endpoint(body: IncidentCreate) -> dict:
    incident = create_incident(
        DB_PATH,
        label=body.label,
        started_at=body.started_at,
        ended_at=body.ended_at,
        notes=body.notes,
        severity=body.severity,
    )
    return dataclasses.asdict(incident)


@router.get("/api/incidents")
def list_incidents_endpoint() -> dict:
    return {"incidents": [dataclasses.asdict(i) for i in list_incidents(DB_PATH)]}


@router.get("/api/incidents/{incident_id}")
def get_incident_endpoint(incident_id: str) -> dict:
    incident = get_incident(DB_PATH, incident_id)
    if not incident:
        raise HTTPException(status_code=404, detail="Incident not found")
    entries = get_incident_entries(DB_PATH, incident)
    return {
        **dataclasses.asdict(incident),
        "entries": [dataclasses.asdict(e) for e in entries],
    }


@router.delete("/api/incidents/{incident_id}")
def delete_incident_endpoint(incident_id: str) -> dict:
    if not delete_incident(DB_PATH, incident_id):
        raise HTTPException(status_code=404, detail="Incident not found")
    return {"deleted": incident_id}


app.include_router(router)


# Root redirect → /turnstone/
@app.get("/")
def root_redirect() -> RedirectResponse:
    return RedirectResponse(url="/turnstone/")


# SPA catch-all — serves index.html for any /turnstone/* path that isn't a
# static asset or API route. Must be registered after include_router.
@app.get("/turnstone/{path:path}")
def spa_fallback(path: str) -> FileResponse:
    if DIST_DIR.exists():
        candidate = DIST_DIR / path
        if candidate.is_file():
            return FileResponse(str(candidate))
        return FileResponse(str(DIST_DIR / "index.html"))
    return FileResponse("/dev/null", status_code=503)