decomposer: generate deliverable files for Define the service contract and project architecture for the FastAPI endpoint monitoring service.; Implement the typed monitor CRUD API and concurrency-safe in-memory state according to the service design.; Implement secure on-demand endpoint checks with status updates, latency measurement, robust error handling, and redacted structured logs.; Add operational API endpoints and environment-driven runtime configuration to the monitoring service.; Create automated tests for the monitoring service.; Package the service with Docker and developer documentation.; Validate the complete project.
This commit is contained in:
179
app/main.py
179
app/main.py
@@ -1,105 +1,96 @@
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from contextlib import asynccontextmanager
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from typing import AsyncIterator, cast
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from uuid import UUID
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import httpx
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from fastapi import Depends, FastAPI, HTTPException, Request, Response, status
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from fastapi import FastAPI, HTTPException, Response, status
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from app.checker import EndpointChecker, UnsafeTarget
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from app.config import Settings, get_settings
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from app.logging import configure_logging
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from app.models import (CheckResult, CheckStatus, HealthResponse, Monitor,
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MonitorCreate, MonitorUpdate)
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from app.store import MonitorStore, Snapshot
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from .checker import EndpointChecker
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from .config import get_settings
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from .logging_config import configure_logging
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from .models import Monitor, MonitorCreate, MonitorUpdate, ProbeResponse, StatusResponse
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from .store import MonitorStore
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settings = get_settings()
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configure_logging(settings.log_level)
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def error(status_code: int, code: str, message: str) -> HTTPException:
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return HTTPException(status_code=status_code,
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detail={"code": code, "message": message})
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@asynccontextmanager
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async def lifespan(app: FastAPI):
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app.state.store = MonitorStore()
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app.state.ready = True
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async with httpx.AsyncClient() as client:
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app.state.checker = EndpointChecker(client, settings.request_timeout_seconds, settings.max_redirects, settings.max_response_bytes)
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yield
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app.state.ready = False
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def create_app(settings: Settings | None = None) -> FastAPI:
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config = settings or get_settings()
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configure_logging(config.log_level)
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@asynccontextmanager
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async def lifespan(application: FastAPI) -> AsyncIterator[None]:
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application.state.store = MonitorStore()
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async with httpx.AsyncClient() as client:
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application.state.checker = EndpointChecker(client, config)
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yield
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application = FastAPI(title=config.app_name, version="1.0.0", lifespan=lifespan)
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def store(request: Request) -> MonitorStore:
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return cast(MonitorStore, request.app.state.store)
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async def existing(monitor_id: UUID, repository: MonitorStore = Depends(store)) -> Snapshot:
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snapshot = await repository.snapshot(monitor_id)
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if snapshot is None:
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raise error(404, "monitor_not_found", "Monitor not found")
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return snapshot
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@application.post("/v1/monitors", response_model=Monitor,
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status_code=status.HTTP_201_CREATED)
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async def create_monitor(data: MonitorCreate,
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repository: MonitorStore = Depends(store)) -> Monitor:
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return await repository.create(data)
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@application.get("/v1/monitors", response_model=list[Monitor])
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async def list_monitors(repository: MonitorStore = Depends(store)) -> list[Monitor]:
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return await repository.list()
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@application.get("/v1/monitors/{monitor_id}", response_model=Monitor)
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async def get_monitor(snapshot: Snapshot = Depends(existing)) -> Monitor:
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return snapshot.monitor
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@application.patch("/v1/monitors/{monitor_id}", response_model=Monitor)
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async def update_monitor(monitor_id: UUID, data: MonitorUpdate,
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repository: MonitorStore = Depends(store)) -> Monitor:
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item = await repository.update(monitor_id, data)
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if item is None:
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raise error(404, "monitor_not_found", "Monitor not found")
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return item
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@application.delete("/v1/monitors/{monitor_id}", status_code=204)
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async def delete_monitor(monitor_id: UUID,
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repository: MonitorStore = Depends(store)) -> Response:
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if not await repository.delete(monitor_id):
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raise error(404, "monitor_not_found", "Monitor not found")
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return Response(status_code=204)
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@application.post("/v1/monitors/{monitor_id}/checks", response_model=CheckResult)
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async def run_check(request: Request, snapshot: Snapshot = Depends(existing),
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repository: MonitorStore = Depends(store)) -> CheckResult:
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checker = cast(EndpointChecker, request.app.state.checker)
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try:
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check_status = await checker.check(str(snapshot.monitor.url))
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except UnsafeTarget as exc:
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blocked = CheckStatus(state="error", error=str(exc))
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await repository.apply_status(snapshot.monitor.id, snapshot.revision, blocked)
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raise error(400, "unsafe_target", str(exc)) from exc
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applied = await repository.apply_status(
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snapshot.monitor.id, snapshot.revision, check_status
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)
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return CheckResult(monitor_id=snapshot.monitor.id, status_applied=applied,
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**check_status.model_dump())
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@application.get("/v1/monitors/{monitor_id}/status", response_model=CheckStatus)
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async def current_status(snapshot: Snapshot = Depends(existing)) -> CheckStatus:
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return snapshot.monitor.status
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@application.get("/healthz", response_model=HealthResponse)
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async def health() -> HealthResponse:
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return HealthResponse(status="ok")
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@application.get("/readyz", response_model=HealthResponse)
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async def ready(request: Request) -> HealthResponse:
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if not hasattr(request.app.state, "store") or not hasattr(request.app.state, "checker"):
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raise error(503, "not_ready", "Service dependencies are not initialized")
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return HealthResponse(status="ready")
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return application
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app = FastAPI(title=settings.app_name, version="1.0.0", lifespan=lifespan)
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app = create_app()
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def missing() -> HTTPException:
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return HTTPException(status_code=404, detail="monitor not found")
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@app.post("/api/v1/monitors", response_model=Monitor, status_code=status.HTTP_201_CREATED)
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async def create_monitor(data: MonitorCreate) -> Monitor:
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return await app.state.store.create(data)
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@app.get("/api/v1/monitors", response_model=list[Monitor])
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async def list_monitors() -> list[Monitor]:
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return await app.state.store.list()
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@app.get("/api/v1/monitors/{monitor_id}", response_model=Monitor)
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async def get_monitor(monitor_id: UUID) -> Monitor:
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item = await app.state.store.get(monitor_id)
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if item is None:
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raise missing()
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return item
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@app.put("/api/v1/monitors/{monitor_id}", response_model=Monitor)
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async def update_monitor(monitor_id: UUID, data: MonitorUpdate) -> Monitor:
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item = await app.state.store.update(monitor_id, data)
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if item is None:
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raise missing()
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return item
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@app.delete("/api/v1/monitors/{monitor_id}", status_code=status.HTTP_204_NO_CONTENT)
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async def delete_monitor(monitor_id: UUID) -> Response:
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if not await app.state.store.delete(monitor_id):
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raise missing()
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return Response(status_code=status.HTTP_204_NO_CONTENT)
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@app.post("/api/v1/monitors/{monitor_id}/check", response_model=Monitor)
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async def check_monitor(monitor_id: UUID) -> Monitor:
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item = await app.state.store.get(monitor_id)
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if item is None:
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raise missing()
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result = await app.state.checker.check(str(monitor_id), str(item.url))
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updated = await app.state.store.record(monitor_id, result)
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if updated is None:
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raise missing()
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return updated
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@app.get("/api/v1/monitors/{monitor_id}/status", response_model=StatusResponse)
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async def monitor_status(monitor_id: UUID) -> StatusResponse:
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item = await app.state.store.get(monitor_id)
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if item is None:
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raise missing()
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return StatusResponse(id=item.id, status=item.status, checked_at=item.checked_at or item.created_at, latency_ms=item.latency_ms or 0, http_status=item.http_status, error=item.error)
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@app.get("/healthz", response_model=ProbeResponse)
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async def health() -> ProbeResponse:
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return ProbeResponse(status="ok")
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@app.get("/readyz", response_model=ProbeResponse)
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async def ready() -> ProbeResponse:
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if not getattr(app.state, "ready", False):
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raise HTTPException(status_code=503, detail="not ready")
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return ProbeResponse(status="ready")
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