222 lines
7.0 KiB
Python
222 lines
7.0 KiB
Python
#!/usr/bin/env python3
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"""
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Backfill scraper Portal Inmobiliario Chile (MercadoLibre)
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Checkpoint: /opt/scrapers/portal_inmobiliario_cl/backfill_state.json
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{"page": N, "total_new": M}
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Para reiniciar desde cero: borrar el archivo de checkpoint.
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"""
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import os, re, time, logging, json
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import requests
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import psycopg2
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from psycopg2.extras import execute_values
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from datetime import datetime
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logging.basicConfig(
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level=logging.INFO,
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format='%(asctime)s %(levelname)s %(message)s',
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datefmt='%Y-%m-%d %H:%M:%S',
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)
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log = logging.getLogger('portal_inmobiliario_backfill')
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PROXY = 'socks5h://127.0.0.1:1090'
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PROXIES = {'http': PROXY, 'https': PROXY}
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DB_HOST = '100.75.240.87'
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DB_NAME = 'portal_inmobiliario_cl'
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DB_USER = 'pgadmin'
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DB_PASS = 'J5BVlq65JvedWxZVrcY96OQX'
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UA = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 Chrome/124 Safari/537.36'
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BASE = 'https://www.portalinmobiliario.com'
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PAGE1_URL = BASE + '/venta/casas'
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PAGE_URL = BASE + '/venta/casas_Desde_{}_NoIndex_True'
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STEP = 48
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DELAY = 1.2
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MAX_PAGES = int(os.environ.get('BF_MAX_PAGES', '400'))
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MAX_STREAK = int(os.environ.get('BF_STREAK', '8'))
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STATE_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'backfill_state.json')
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def load_state():
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if os.path.exists(STATE_FILE):
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with open(STATE_FILE) as f:
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st = json.load(f)
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log.info('Checkpoint: pagina=%d total_new=%d', st['page'], st.get('total_new', 0))
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return st
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return {'page': 1, 'total_new': 0}
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def save_state(page, total_new):
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with open(STATE_FILE, 'w') as f:
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json.dump({'page': page, 'total_new': total_new, 'ts': datetime.utcnow().isoformat()}, f)
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def get_session():
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s = requests.Session()
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s.proxies.update(PROXIES)
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s.headers.update({'User-Agent': UA, 'Accept': 'text/html,application/xhtml+xml,*/*;q=0.8',
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'Accept-Language': 'es-CL,es;q=0.9'})
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return s
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def get_conn():
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return psycopg2.connect(host=DB_HOST, port=5432, dbname=DB_NAME,
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user=DB_USER, password=DB_PASS, connect_timeout=10)
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def create_table(conn):
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cur = conn.cursor()
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cur.execute("""
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CREATE TABLE IF NOT EXISTS listings (
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listing_id TEXT PRIMARY KEY,
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titulo TEXT,
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precio BIGINT,
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moneda TEXT DEFAULT 'CLP',
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tipo TEXT DEFAULT 'venta',
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ubicacion TEXT,
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url TEXT,
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ambientes INT,
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superficie_m2 DECIMAL,
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scraped_at TIMESTAMP DEFAULT NOW()
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)
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""")
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conn.commit()
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cur.close()
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def upsert(conn, rows):
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if not rows:
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return 0
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deduped = list({r['listing_id']: r for r in rows}.values())
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cur = conn.cursor()
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execute_values(cur,
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"""INSERT INTO listings (listing_id, titulo, precio, moneda, tipo, ubicacion, url, scraped_at)
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VALUES %s
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ON CONFLICT (listing_id) DO UPDATE SET
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titulo=EXCLUDED.titulo, precio=EXCLUDED.precio, scraped_at=EXCLUDED.scraped_at""",
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[(r['listing_id'], r['titulo'], r['precio'], r.get('moneda', 'CLP'),
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'venta', r.get('ubicacion', 'Chile'), r['url'], datetime.utcnow()) for r in deduped]
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)
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n = cur.rowcount
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conn.commit()
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cur.close()
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return n
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def extract_listings(html):
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results = []
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mlc_ids = list(dict.fromkeys(re.findall(r'"id"\s*:\s*"(MLC\d+)"', html)))
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for mlc_id in mlc_ids:
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pos = html.find(f'"id":"{mlc_id}"')
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if pos == -1:
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pos = html.find(f'"id": "{mlc_id}"')
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if pos == -1:
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continue
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start = max(0, pos - 500)
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end = min(len(html), pos + 1000)
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ctx = html[start:end]
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titulo = ''
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precio = None
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moneda = 'CLP'
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ubicacion = 'Chile'
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url = BASE + '/' + mlc_id
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m = re.search(r'"title"\s*:\s*"([^"]{5,200})"', ctx)
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if not m:
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m = re.search(r'"name"\s*:\s*"([^"]{5,200})"', ctx)
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if m:
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titulo = m.group(1)
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m = re.search(r'"amount"\s*:\s*(\d+)', ctx)
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if not m:
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m = re.search(r'"price"\s*:\s*(\d+)', ctx)
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if m:
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precio = int(m.group(1))
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m = re.search(r'"currency_id"\s*:\s*"([A-Z]{3})"', ctx)
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if m:
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moneda = m.group(1)
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m = re.search(r'"permalink"\s*:\s*"(https://www\.portalinmobiliario\.com/[^"]+)"', ctx)
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if m:
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url = m.group(1)
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m = re.search(r'"city_name"\s*:\s*"([^"]+)"', ctx)
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if m:
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ubicacion = m.group(1)
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results.append({'listing_id': mlc_id, 'titulo': titulo[:300] or 'Sin titulo',
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'precio': precio, 'moneda': moneda,
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'ubicacion': ubicacion[:200], 'url': url})
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return results
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def fetch_page(sess, page):
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url = PAGE1_URL if page == 1 else PAGE_URL.format((page - 1) * STEP)
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for attempt in range(3):
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try:
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resp = sess.get(url, timeout=30)
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if resp.status_code == 404:
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return None
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if resp.status_code in (403, 429):
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log.warning('HTTP %d en %s', resp.status_code, url)
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time.sleep(60)
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continue
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resp.raise_for_status()
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break
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except Exception as e:
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if attempt == 2:
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log.error('Error %s: %s', url, e)
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return []
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time.sleep([2, 5, 15][attempt])
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listings = extract_listings(resp.text)
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log.info('Pagina %d (offset=%d): %d listings', page, (page - 1) * STEP, len(listings))
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return listings
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def main():
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state = load_state()
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start_page = state['page']
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total_new = state.get('total_new', 0)
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log.info('=== Backfill Portal Inmobiliario CL — desde pagina %d ===', start_page)
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sess = get_session()
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conn = get_conn()
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create_table(conn)
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streak = 0
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last_page = start_page
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for page in range(start_page, MAX_PAGES + 1):
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last_page = page
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rows = fetch_page(sess, page)
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if rows is None:
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log.info('Pagina %d: 404 — fin de paginacion', page)
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save_state(page + 1, total_new)
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break
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if not rows:
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streak += 1
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save_state(page + 1, total_new)
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log.info('Pagina %d: sin listings (racha %d/%d)', page, streak, MAX_STREAK)
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if streak >= MAX_STREAK:
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log.info('Deteniendo: %d paginas consecutivas sin listings', streak)
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break
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time.sleep(DELAY)
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continue
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n = upsert(conn, rows)
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streak = 0 if n > 0 else streak + 1
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total_new += n
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save_state(page + 1, total_new)
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log.info('Pagina %d: %d nuevos (acumulado %d)', page, n, total_new)
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if streak >= MAX_STREAK:
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log.info('Deteniendo: %d paginas sin nuevos', streak)
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break
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time.sleep(DELAY)
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conn.close()
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log.info('=== Backfill finalizado: %d nuevos (ultima pagina: %d) ===', total_new, last_page)
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print(f'Finalizado: {total_new} nuevos')
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if __name__ == '__main__':
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main()
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