423 lines
14 KiB
Python
423 lines
14 KiB
Python
"""Funda real-estate ingestion assets."""
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import json
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from pathlib import Path
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from dagster import (
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AssetExecutionContext,
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Config,
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MaterializeResult,
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MetadataValue,
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asset,
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)
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from sqlalchemy import text
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from data_platform.helpers import (
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format_area,
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format_euro,
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md_preview_table,
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render_sql,
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safe_int,
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)
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from data_platform.resources import FundaResource, PostgresResource
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_SQL_DIR = Path(__file__).parent / "sql"
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_SCHEMA = "raw_funda"
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class FundaSearchConfig(Config):
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"""Search parameters for Funda."""
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location: str = "woerden"
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offering_type: str = "buy"
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price_min: int | None = 300000
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price_max: int | None = 500000
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area_min: int | None = None
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area_max: int | None = None
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plot_min: int | None = None
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plot_max: int | None = None
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object_type: str | None = None
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energy_label: str | None = None
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radius_km: int | None = 50
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sort: str = "newest"
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max_pages: int = 10
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class FundaDetailsConfig(Config):
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"""Config for listing details fetch."""
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fetch_all: bool = False
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class FundaPriceHistoryConfig(Config):
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"""Config for price history fetch."""
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fetch_all: bool = False
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@asset(
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group_name="funda",
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kinds={"python", "postgres"},
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description="Search Funda listings and store results in Postgres.",
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)
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def funda_search_results(
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context: AssetExecutionContext,
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config: FundaSearchConfig,
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funda: FundaResource,
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postgres: PostgresResource,
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) -> MaterializeResult:
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client = funda.get_client()
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kwargs: dict = {
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"location": [loc.strip() for loc in config.location.split(",")],
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"offering_type": config.offering_type,
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"sort": config.sort,
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}
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if config.price_min is not None:
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kwargs["price_min"] = config.price_min
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if config.price_max is not None:
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kwargs["price_max"] = config.price_max
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if config.area_min is not None:
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kwargs["area_min"] = config.area_min
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if config.area_max is not None:
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kwargs["area_max"] = config.area_max
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if config.plot_min is not None:
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kwargs["plot_min"] = config.plot_min
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if config.plot_max is not None:
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kwargs["plot_max"] = config.plot_max
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if config.object_type:
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kwargs["object_type"] = [t.strip() for t in config.object_type.split(",")]
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if config.energy_label:
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kwargs["energy_label"] = [lbl.strip() for lbl in config.energy_label.split(",")]
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if config.radius_km is not None:
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kwargs["radius_km"] = config.radius_km
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all_listings = []
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for page in range(config.max_pages):
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context.log.info(f"Fetching search page {page + 1}/{config.max_pages} …")
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kwargs["page"] = page
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results = client.search_listing(**kwargs)
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if not results:
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context.log.info("No more results.")
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break
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all_listings.extend(results)
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context.log.info(f" got {len(results)} listings (total: {len(all_listings)})")
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if not all_listings:
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context.log.warning("Search returned zero results.")
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return MaterializeResult(metadata={"count": 0})
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engine = postgres.get_engine()
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with engine.begin() as conn:
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conn.execute(text(f"CREATE SCHEMA IF NOT EXISTS {_SCHEMA}"))
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conn.execute(
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text(render_sql(_SQL_DIR, "ddl/create_search_results.sql", schema=_SCHEMA))
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)
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rows = []
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for listing in all_listings:
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d = listing.to_dict()
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rows.append(
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{
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"global_id": d.get("global_id"),
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"title": d.get("title"),
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"city": d.get("city"),
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"postcode": d.get("postcode"),
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"province": d.get("province"),
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"neighbourhood": d.get("neighbourhood"),
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"price": safe_int(d.get("price")),
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"living_area": safe_int(d.get("living_area")),
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"plot_area": safe_int(d.get("plot_area")),
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"bedrooms": safe_int(d.get("bedrooms")),
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"rooms": safe_int(d.get("rooms")),
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"energy_label": d.get("energy_label"),
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"object_type": d.get("object_type"),
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"offering_type": d.get("offering_type"),
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"construction_type": d.get("construction_type"),
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"publish_date": d.get("publish_date"),
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"broker_id": str(d.get("broker_id", "")),
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"broker_name": d.get("broker_name"),
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"raw_json": json.dumps(d, default=str),
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}
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)
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postgres.execute_many(
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render_sql(_SQL_DIR, "dml/insert_search_results.sql", schema=_SCHEMA), rows
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)
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# Mark listings not seen in the last 7 days as inactive.
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engine = postgres.get_engine()
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with engine.begin() as conn:
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result = conn.execute(
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text(
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f"UPDATE {_SCHEMA}.search_results"
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f" SET is_active = FALSE"
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f" WHERE last_seen_at < now() - INTERVAL '7 days'"
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f" RETURNING global_id"
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)
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)
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newly_inactive = result.rowcount
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context.log.info(
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f"Inserted {len(rows)} search results into {_SCHEMA}.search_results"
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f" ({newly_inactive} listings marked inactive)"
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)
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return MaterializeResult(
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metadata={
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"count": len(rows),
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"newly_inactive": newly_inactive,
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"location": MetadataValue.text(config.location),
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"offering_type": MetadataValue.text(config.offering_type),
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"preview": MetadataValue.md(
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md_preview_table(
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rows[:10],
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columns=[
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("title", "Title"),
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("city", "City"),
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("price", "Price"),
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("living_area", "Area"),
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("bedrooms", "Bedrooms"),
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],
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formatters={"price": format_euro, "living_area": format_area},
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),
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),
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}
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)
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@asset(
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group_name="funda",
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kinds={"python", "postgres"},
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deps=[funda_search_results],
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description="Fetch full listing details for each search result and store in Postgres.",
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)
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def funda_listing_details(
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context: AssetExecutionContext,
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config: FundaDetailsConfig,
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funda: FundaResource,
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postgres: PostgresResource,
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) -> MaterializeResult:
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client = funda.get_client()
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engine = postgres.get_engine()
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with engine.begin() as conn:
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conn.execute(text(f"CREATE SCHEMA IF NOT EXISTS {_SCHEMA}"))
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conn.execute(
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text(render_sql(_SQL_DIR, "ddl/create_listing_details.sql", schema=_SCHEMA))
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)
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with engine.connect() as conn:
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if config.fetch_all:
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query = text(f"SELECT DISTINCT global_id FROM {_SCHEMA}.search_results")
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else:
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query = text(
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f"""
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SELECT DISTINCT s.global_id
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FROM {_SCHEMA}.search_results s
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LEFT JOIN {_SCHEMA}.listing_details d ON s.global_id = d.global_id
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WHERE s.is_active = TRUE
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AND (d.global_id IS NULL OR d.is_stale = TRUE)
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"""
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)
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result = conn.execute(query)
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ids = [row[0] for row in result if row[0]]
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if not ids:
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context.log.warning("No search results found – run funda_search_results first.")
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return MaterializeResult(metadata={"count": 0})
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context.log.info(f"Fetching details for {len(ids)} listings …")
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rows = []
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errors = 0
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for i, gid in enumerate(ids):
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try:
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listing = client.get_listing(int(gid))
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d = listing.to_dict()
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rows.append(
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{
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"global_id": d.get("global_id"),
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"tiny_id": str(d.get("tiny_id", "")),
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"title": d.get("title"),
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"city": d.get("city"),
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"postcode": d.get("postcode"),
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"province": d.get("province"),
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"neighbourhood": d.get("neighbourhood"),
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"municipality": d.get("municipality"),
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"price": safe_int(d.get("price")),
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"price_formatted": d.get("price_formatted"),
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"status": d.get("status"),
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"offering_type": d.get("offering_type"),
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"object_type": d.get("object_type"),
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"house_type": d.get("house_type"),
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"construction_type": d.get("construction_type"),
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"construction_year": d.get("construction_year"),
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"energy_label": d.get("energy_label"),
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"living_area": safe_int(d.get("living_area")),
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"plot_area": safe_int(d.get("plot_area")),
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"bedrooms": safe_int(d.get("bedrooms")),
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"rooms": safe_int(d.get("rooms")),
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"description": d.get("description"),
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"publication_date": d.get("publication_date"),
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"latitude": d.get("latitude"),
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"longitude": d.get("longitude"),
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"has_garden": d.get("has_garden"),
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"has_balcony": d.get("has_balcony"),
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"has_solar_panels": d.get("has_solar_panels"),
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"has_heat_pump": d.get("has_heat_pump"),
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"has_roof_terrace": d.get("has_roof_terrace"),
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"is_energy_efficient": d.get("is_energy_efficient"),
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"is_monument": d.get("is_monument"),
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"url": d.get("url"),
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"photo_count": safe_int(d.get("photo_count")),
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"views": safe_int(d.get("views")),
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"saves": safe_int(d.get("saves")),
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"raw_json": json.dumps(d, default=str),
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}
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)
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except Exception as e:
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errors += 1
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context.log.warning(f"Failed to fetch listing {gid}: {e}")
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continue
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if (i + 1) % 10 == 0:
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context.log.info(f" fetched {i + 1}/{len(ids)} …")
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if rows:
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postgres.execute_many(
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render_sql(_SQL_DIR, "dml/insert_listing_details.sql", schema=_SCHEMA), rows
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)
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# Mark details as stale where the parent search listing is no longer active.
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with engine.begin() as conn:
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conn.execute(
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text(
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f"""
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UPDATE {_SCHEMA}.listing_details d
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SET is_stale = TRUE
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FROM {_SCHEMA}.search_results s
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WHERE d.global_id = s.global_id
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AND s.is_active = FALSE
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AND d.is_stale = FALSE
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"""
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)
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)
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context.log.info(
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f"Inserted {len(rows)} listing details ({errors} errors) into {_SCHEMA}.listing_details"
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)
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return MaterializeResult(
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metadata={
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"count": len(rows),
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"errors": errors,
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"preview": MetadataValue.md(
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md_preview_table(
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rows[:10],
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columns=[
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("title", "Title"),
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("city", "City"),
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("price", "Price"),
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("status", "Status"),
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("energy_label", "Energy"),
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],
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formatters={"price": format_euro},
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),
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),
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}
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)
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@asset(
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group_name="funda",
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kinds={"python", "postgres"},
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deps=[funda_listing_details],
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description="Fetch price history for each detailed listing and store in Postgres.",
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)
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def funda_price_history(
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context: AssetExecutionContext,
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config: FundaPriceHistoryConfig,
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funda: FundaResource,
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postgres: PostgresResource,
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) -> MaterializeResult:
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client = funda.get_client()
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engine = postgres.get_engine()
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with engine.begin() as conn:
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conn.execute(text(f"CREATE SCHEMA IF NOT EXISTS {_SCHEMA}"))
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conn.execute(
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text(render_sql(_SQL_DIR, "ddl/create_price_history.sql", schema=_SCHEMA))
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)
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with engine.connect() as conn:
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if config.fetch_all:
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query = text(f"SELECT DISTINCT global_id FROM {_SCHEMA}.listing_details")
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else:
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query = text(
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f"""
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SELECT DISTINCT d.global_id
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FROM {_SCHEMA}.listing_details d
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JOIN {_SCHEMA}.search_results s ON d.global_id = s.global_id
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WHERE s.is_active = TRUE
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UNION
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SELECT DISTINCT d.global_id
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FROM {_SCHEMA}.listing_details d
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LEFT JOIN {_SCHEMA}.price_history p ON d.global_id = p.global_id
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WHERE p.global_id IS NULL
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"""
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)
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result = conn.execute(query)
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ids = [row[0] for row in result if row[0]]
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if not ids:
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context.log.warning(
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"No listing details found – run funda_listing_details first."
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)
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return MaterializeResult(metadata={"count": 0})
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context.log.info(f"Fetching price history for {len(ids)} listings …")
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rows = []
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errors = 0
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for i, gid in enumerate(ids):
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try:
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listing = client.get_listing(int(gid))
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history = client.get_price_history(listing)
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for entry in history:
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rows.append(
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{
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"global_id": gid,
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"price": safe_int(entry.get("price")),
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"human_price": entry.get("human_price"),
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"date": entry.get("date"),
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"timestamp": entry.get("timestamp"),
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"source": entry.get("source"),
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"status": entry.get("status"),
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}
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)
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except Exception as e:
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errors += 1
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context.log.warning(f"Failed to fetch price history for {gid}: {e}")
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continue
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if (i + 1) % 10 == 0:
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context.log.info(f" fetched {i + 1}/{len(ids)} …")
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if rows:
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postgres.execute_many(
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render_sql(_SQL_DIR, "dml/insert_price_history.sql", schema=_SCHEMA), rows
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)
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context.log.info(
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f"Inserted {len(rows)} price history records ({errors} errors) into {_SCHEMA}.price_history"
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)
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return MaterializeResult(
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metadata={
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"count": len(rows),
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"errors": errors,
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"listings_processed": len(ids) - errors,
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}
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)
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