wrongmove/crawler/1_dump_listings.py

import asyncio
import json
import pathlib
from typing import Any
from rec.query import detail_query, listing_query, QueryParameters
from rec.districts import get_districts
from repositories import ListingRepository
from tqdm.asyncio import tqdm
from data_access import Listing
from models import Listing as modelListing


async def dump_listings(
    parameters: QueryParameters,
    repository: ListingRepository,
    data_dir: pathlib.Path = pathlib.Path("data/rs/"),
) -> list[modelListing]:
    if parameters.district_names:
        districts = {
            district: locid
            for district, locid in get_districts().items()
            if district in parameters.district_names
        }
    else:
        districts = get_districts()
    print("Valid districts to scrape:", districts.keys())

    semaphore = asyncio.Semaphore(5)  # if too high, rightmove drops connections
    json_responses = await tqdm.gather(
        *[
            _fetch_listings_with_semaphore(semaphore, i, parameters, locid)
            for locid in districts.values()
            for i in [1, 2]
        ],
        desc="Fetching listings",
    )
    listings: list[Listing] = []
    for response_json in json_responses:
        if response_json["totalAvailableResults"] == 0:
            continue
        for property in response_json["properties"]:
            identifier = property["identifier"]

            listing = Listing(identifier, data_dir=data_dir, _listing_object=property)
            listings.append(listing)

    # if listing is already in db, do not fetch details again
    all_listing_ids = [l.id for l in await repository.get_listings()]
    missing_listing = [
        listing for listing in listings if listing.identifier not in all_listing_ids
    ]
    listing_details = await tqdm.gather(
        *[
            _fetch_detail_with_semaphore(semaphore, listing.identifier)
            for listing in missing_listing
        ],
        desc="Fetching details (only missing)",
    )
    for listing, detail in zip(missing_listing, listing_details):
        listing._details_object = detail

    await dump_listings_to_fs(missing_listing)
    model_listings = await repository.upsert_listings_legacy(
        missing_listing
    )  # upsert in db

    return model_listings


async def _fetch_listings_with_semaphore(
    semaphore: asyncio.Semaphore,
    page_id: int,
    parameters: QueryParameters,
    location_id: str,
) -> dict[str, Any]:
    async with semaphore:
        listing_query_result = await listing_query(
            page=page_id,
            channel=parameters.listing_type,
            min_bedrooms=parameters.min_bedrooms,
            max_bedrooms=parameters.max_bedrooms,
            radius=parameters.radius,
            min_price=parameters.min_price,
            max_price=parameters.max_price,
            location_id=location_id,
            page_size=parameters.page_size,
            max_days_since_added=parameters.max_days_since_added,
            furnish_types=parameters.furnish_types or [],
        )

    return listing_query_result


async def _fetch_detail_with_semaphore(
    semaphore: asyncio.Semaphore, listing_id: int
) -> dict[str, Any]:
    async with semaphore:
        d = await detail_query(listing_id)
    return d


async def dump_listings_to_fs(listings: list[Listing]) -> None:
    for listing in tqdm(listings, desc="Dumping listings to FS"):
        listing.dump_listing()
        # if not listing.path_detail_json().exists():
        with open(listing.path_detail_json(), "w") as f:
            json.dump(listing._details_object, f, indent=4)