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# coding: utf-8
"""
Main commands available for flatisfy.
"""
from __future__ import absolute_import, print_function, unicode_literals
import collections
import logging
import os
import flatisfy.filters
from flatisfy import database
from flatisfy import email
from flatisfy.models import flat as flat_model
from flatisfy.models import postal_code as postal_code_model
from flatisfy.models import public_transport as public_transport_model
from flatisfy import fetch
from flatisfy import tools
from flatisfy.filters import metadata
from flatisfy.web import app as web_app
import time
from ratelimit.exception import RateLimitException
LOGGER = logging.getLogger(__name__)
def filter_flats_list(config, constraint_name, flats_list, fetch_details=True, past_flats=None):
"""
Filter the available flats list. Then, filter it according to criteria.
:param config: A config dict.
:param constraint_name: The constraint name that the ``flats_list`` should
satisfy.
:param flats_list: The initial list of flat objects to filter.
:param fetch_details: Whether additional details should be fetched between
the two passes.
:param past_flats: The list of already fetched flats
:return: A dict mapping flat status and list of flat objects.
"""
# Add the flatisfy metadata entry and prepare the flat objects
flats_list = metadata.init(flats_list, constraint_name)
# Get the associated constraint from config
try:
constraint = config["constraints"][constraint_name]
except KeyError:
LOGGER.error(
"Missing constraint %s. Skipping filtering for these posts.",
constraint_name,
)
return {"new": [], "duplicate": [], "ignored": []}
first_pass_result = collections.defaultdict(list)
second_pass_result = collections.defaultdict(list)
third_pass_result = collections.defaultdict(list)
# Do a first pass with the available infos to try to remove as much
# unwanted postings as possible
if config["passes"] > 0:
first_pass_result = flatisfy.filters.first_pass(flats_list, constraint, config)
else:
first_pass_result["new"] = flats_list
# Load additional infos
if fetch_details:
past_ids = {x["id"]: x for x in past_flats} if past_flats else {}
for i, flat in enumerate(first_pass_result["new"]):
details = None
use_cache = past_ids.get(flat["id"])
if use_cache:
LOGGER.debug("Skipping details download for %s.", flat["id"])
details = use_cache
else:
if flat["id"].split("@")[1] in ["seloger", "leboncoin"]:
try:
details = fetch.fetch_details_rate_limited(config, flat["id"])
except RateLimitException:
time.sleep(60)
details = fetch.fetch_details_rate_limited(config, flat["id"])
else:
details = fetch.fetch_details(config, flat["id"])
first_pass_result["new"][i] = tools.merge_dicts(flat, details)
# Do a second pass to consolidate all the infos we found and make use of
# additional infos
if config["passes"] > 1:
second_pass_result = flatisfy.filters.second_pass(first_pass_result["new"], constraint, config)
else:
second_pass_result["new"] = first_pass_result["new"]
# Do a third pass to deduplicate better
if config["passes"] > 2:
third_pass_result = flatisfy.filters.third_pass(second_pass_result["new"], config)
else:
third_pass_result["new"] = second_pass_result["new"]
return {
"new": third_pass_result["new"],
"duplicate": (
first_pass_result["duplicate"] + second_pass_result["duplicate"] + third_pass_result["duplicate"]
),
"ignored": (first_pass_result["ignored"] + second_pass_result["ignored"] + third_pass_result["ignored"]),
}
def filter_fetched_flats(config, fetched_flats, fetch_details=True, past_flats={}):
"""
Filter the available flats list. Then, filter it according to criteria.
:param config: A config dict.
:param fetch_details: Whether additional details should be fetched between
the two passes.
:param fetched_flats: The initial dict mapping constraints to the list of
fetched flat objects to filter.
:return: A dict mapping constraints to a dict mapping flat status and list
of flat objects.
"""
for constraint_name, flats_list in fetched_flats.items():
fetched_flats[constraint_name] = filter_flats_list(
config,
constraint_name,
flats_list,
fetch_details,
past_flats.get(constraint_name, None),
)
return fetched_flats
def import_and_filter(config, load_from_db=False, new_only=False):
"""
Fetch the available flats list. Then, filter it according to criteria.
Finally, store it in the database.
:param config: A config dict.
:param load_from_db: Whether to load flats from database or fetch them
using WebOOB.
:return: ``None``.
"""
# Fetch and filter flats list
past_flats = fetch.load_flats_from_db(config)
if load_from_db:
fetched_flats = past_flats
else:
fetched_flats = fetch.fetch_flats(config)
# Do not fetch additional details if we loaded data from the db.
flats_by_status = filter_fetched_flats(
config,
fetched_flats=fetched_flats,
fetch_details=(not load_from_db),
past_flats=past_flats if new_only else {},
)
# Create database connection
get_session = database.init_db(config["database"], config["search_index"])
new_flats = []
result = []
LOGGER.info("Merging fetched flats in database...")
# Flatten the flats_by_status dict
flatten_flats_by_status = collections.defaultdict(list)
for flats in flats_by_status.values():
for status, flats_list in flats.items():
flatten_flats_by_status[status].extend(flats_list)
with get_session() as session:
# Set is_expired to true for all existing flats.
# This will be set back to false if we find them during importing.
for flat in session.query(flat_model.Flat).all():
flat.is_expired = True
for status, flats_list in flatten_flats_by_status.items():
# Build SQLAlchemy Flat model objects for every available flat
flats_objects = {flat_dict["id"]: flat_model.Flat.from_dict(flat_dict) for flat_dict in flats_list}
if flats_objects:
# If there are some flats, try to merge them with the ones in
# db
existing_flats_queries = session.query(flat_model.Flat).filter(
flat_model.Flat.id.in_(flats_objects.keys())
)
for each in existing_flats_queries.all():
# For each flat to merge, take care not to overwrite the
# status if the user defined it
flat_object = flats_objects[each.id]
if each.status in flat_model.AUTOMATED_STATUSES:
flat_object.status = getattr(flat_model.FlatStatus, status)
else:
flat_object.status = each.status
# Every flat we fetched isn't expired
flat_object.is_expired = False
# For each flat already in the db, merge it (UPDATE)
# instead of adding it
session.merge(flats_objects.pop(each.id))
# For any other flat, it is not already in the database, so we can
# just set the status field without worrying
for flat in flats_objects.values():
flat.status = getattr(flat_model.FlatStatus, status)
if flat.status == flat_model.FlatStatus.new:
new_flats.append(flat)
result.append(flat.id)
session.add_all(flats_objects.values())
if config["send_email"]:
email.send_notification(config, new_flats)
LOGGER.info(f"Found {len(result)} new flats.")
# Touch a file to indicate last update timestamp
ts_file = os.path.join(config["data_directory"], "timestamp")
with open(ts_file, "w"):
os.utime(ts_file, None)
LOGGER.info("Done!")
return result
def purge_db(config):
"""
Purge the database.
:param config: A config dict.
:return: ``None``
"""
get_session = database.init_db(config["database"], config["search_index"])
with get_session() as session:
# Delete every flat in the db
LOGGER.info("Purge all flats from the database.")
for flat in session.query(flat_model.Flat).all():
# Use (slower) deletion by object, to ensure whoosh index is
# updated
session.delete(flat)
LOGGER.info("Purge all postal codes from the database.")
session.query(postal_code_model.PostalCode).delete()
LOGGER.info("Purge all public transportations from the database.")
session.query(public_transport_model.PublicTransport).delete()
def serve(config):
"""
Serve the web app.
:param config: A config dict.
:return: ``None``, long-running process.
"""
app = web_app.get_app(config)
server = config.get("webserver", None)
if not server:
# Default webserver is quiet, as Bottle is used with Canister for
# standard logging
server = web_app.QuietWSGIRefServer
print("Launching web viewer running on http://%s:%s" % (config["host"], config["port"]))
app.run(host=config["host"], port=config["port"], server=server)