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e63c592 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | from typing import Any
from fastapi import FastAPI, Request
from fastapi.responses import JSONResponse
from slowapi import Limiter
from slowapi.errors import RateLimitExceeded
from slowapi.middleware import SlowAPIMiddleware
from slowapi.util import get_remote_address
from app.core.config import get_settings
from app.core.logging import get_logger
logger = get_logger(__name__)
# Global limiter instance used for decorators.
limiter = Limiter(key_func=get_remote_address)
def setup_rate_limiter(app: FastAPI) -> None:
"""Configure SlowAPI rate limiting middleware and handlers.
Limits are enabled/disabled via Settings.RATE_LIMIT_ENABLED.
"""
settings = get_settings()
if not getattr(settings, "RATE_LIMIT_ENABLED", True):
logger.info("Rate limiting is disabled via settings.")
return
logger.info("Rate limiting enabled with SlowAPI.")
app.state.limiter = limiter # type: ignore[attr-defined]
@app.exception_handler(RateLimitExceeded)
async def rate_limit_exceeded_handler( # type: ignore[no-redef]
request: Request,
exc: RateLimitExceeded,
) -> JSONResponse:
retry_after: str | None = None
try:
retry_after = exc.headers.get("Retry-After") # type: ignore[assignment]
except Exception: # noqa: BLE001
retry_after = None
logger.warning(
"Rate limit exceeded path=%s client=%s limit=%s",
request.url.path,
get_remote_address(request),
exc.detail,
)
content: dict[str, Any] = {
"detail": "Rate limit exceeded. Please slow down your requests.",
}
if retry_after is not None:
content["retry_after"] = retry_after
return JSONResponse(status_code=429, content=content)
# Attach SlowAPI middleware
app.add_middleware(SlowAPIMiddleware) |