/runserver.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import os
import sys
import shutil
import logging
import time
import re
import requests
import ssl
import json

from distutils.version import StrictVersion

from threading import Thread, Event
from queue import Queue
from cachetools import LFUCache
from flask_cors import CORS
from flask_cache_bust import init_cache_busting

from pogom import config
from pogom.app import Pogom
from pogom.utils import get_args, now

from pogom.search import search_overseer_thread
from pogom.models import (init_database, create_tables, drop_tables,
                          Pokemon, db_updater, clean_db_loop)
from pogom.webhook import wh_updater

from pogom.proxy import check_proxies, proxies_refresher

# Currently supported pgoapi.
pgoapi_version = "1.1.7"

# Moved here so logger is configured at load time.
logging.basicConfig(
    format='%(asctime)s [%(threadName)16s][%(module)14s][%(levelname)8s] ' +
    '%(message)s')
log = logging.getLogger()

# Make sure pogom/pgoapi is actually removed if it is an empty directory.
# This is a leftover directory from the time pgoapi was embedded in
# PokemonGo-Map.
# The empty directory will cause problems with `import pgoapi` so it needs to
# go.
# Now also removes the pogom/libencrypt and pokecrypt-pgoapi folders,
# don't cause issues but aren't needed.
oldpgoapiPath = os.path.join(os.path.dirname(__file__), "pogom/pgoapi")
oldlibPath = os.path.join(os.path.dirname(__file__), "pokecrypt-pgoapi")
oldoldlibPath = os.path.join(os.path.dirname(__file__), "pogom/libencrypt")
if os.path.isdir(oldpgoapiPath):
    log.warn("I found a really really old pgoapi thing, but its no longer " +
             "used. Going to remove it...", oldpgoapiPath)
    shutil.rmtree(oldpgoapiPath)
    log.warn("Done!")
if os.path.isdir(oldlibPath):
    log.warn("I found the pokecrypt-pgoapi folder/submodule, but its no " +
             "longer used. Going to remove it...", oldpgoapiPath)
    shutil.rmtree(oldlibPath)
    log.warn("Done!")
if os.path.isdir(oldoldlibPath):
    log.warn("I found the old libencrypt folder, from when we used to " +
             "bundle encrypt libs, but its no longer used. " +
             "Going to remove it...", oldpgoapiPath)
    shutil.rmtree(oldoldlibPath)
    log.warn("Done!")

# Assert pgoapi is installed.
try:
    import pgoapi
    from pgoapi import utilities as util
except ImportError:
    log.critical(
        "It seems `pgoapi` is not installed. Try running " +
        "pip install --upgrade -r requirements.txt.")
    sys.exit(1)

# Assert pgoapi >= pgoapi_version.
if (not hasattr(pgoapi, "__version__") or
        StrictVersion(pgoapi.__version__) < StrictVersion(pgoapi_version)):
    log.critical(
        "It seems `pgoapi` is not up-to-date. Try running " +
        "pip install --upgrade -r requirements.txt again.")
    sys.exit(1)


# Patch to make exceptions in threads cause an exception.
def install_thread_excepthook():
    """
    Workaround for sys.excepthook thread bug
    (https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1230540&group_id=5470).
    Call once from __main__ before creating any threads.
    If using psyco, call psycho.cannotcompile(threading.Thread.run)
    since this replaces a new-style class method.
    """
    import sys
    run_old = Thread.run

    def run(*args, **kwargs):
        try:
            run_old(*args, **kwargs)
        except (KeyboardInterrupt, SystemExit):
            raise
        except:
            sys.excepthook(*sys.exc_info())
    Thread.run = run


# Exception handler will log unhandled exceptions.
def handle_exception(exc_type, exc_value, exc_traceback):
    if issubclass(exc_type, KeyboardInterrupt):
        sys.__excepthook__(exc_type, exc_value, exc_traceback)
        return

    log.error("Uncaught exception", exc_info=(
        exc_type, exc_value, exc_traceback))


def main():
    # Patch threading to make exceptions catchable.
    install_thread_excepthook()

    # Make sure exceptions get logged.
    sys.excepthook = handle_exception

    args = get_args()

    # Add file logging if enabled.
    if args.verbose and args.verbose != 'nofile':
        filelog = logging.FileHandler(args.verbose)
        filelog.setFormatter(logging.Formatter(
            '%(asctime)s [%(threadName)16s][%(module)14s][%(levelname)8s] ' +
            '%(message)s'))
        logging.getLogger('').addHandler(filelog)
    if args.very_verbose and args.very_verbose != 'nofile':
        filelog = logging.FileHandler(args.very_verbose)
        filelog.setFormatter(logging.Formatter(
            '%(asctime)s [%(threadName)16s][%(module)14s][%(levelname)8s] ' +
            '%(message)s'))
        logging.getLogger('').addHandler(filelog)

    if args.verbose or args.very_verbose:
        log.setLevel(logging.DEBUG)
    else:
        log.setLevel(logging.INFO)

    # Let's not forget to run Grunt / Only needed when running with webserver.
    if not args.no_server:
        if not os.path.exists(
                os.path.join(os.path.dirname(__file__), 'static/dist')):
            log.critical(
                'Missing front-end assets (static/dist) -- please run ' +
                '"npm install && npm run build" before starting the server.')
            sys.exit()

    # You need custom image files now.
    if not os.path.isfile(
            os.path.join(os.path.dirname(__file__),
                         'static/icons-sprite.png')):
        log.critical('Missing sprite files.')
        sys.exit()

    # These are very noisy, let's shush them up a bit.
    logging.getLogger('peewee').setLevel(logging.INFO)
    logging.getLogger('requests').setLevel(logging.WARNING)
    logging.getLogger('pgoapi.pgoapi').setLevel(logging.WARNING)
    logging.getLogger('pgoapi.rpc_api').setLevel(logging.INFO)
    logging.getLogger('werkzeug').setLevel(logging.ERROR)

    config['parse_pokemon'] = not args.no_pokemon
    config['parse_pokestops'] = not args.no_pokestops
    config['parse_gyms'] = not args.no_gyms

    # Turn these back up if debugging.
    if args.verbose or args.very_verbose:
        logging.getLogger('pgoapi').setLevel(logging.DEBUG)
    if args.very_verbose:
        logging.getLogger('peewee').setLevel(logging.DEBUG)
        logging.getLogger('requests').setLevel(logging.DEBUG)
        logging.getLogger('pgoapi.pgoapi').setLevel(logging.DEBUG)
        logging.getLogger('pgoapi.rpc_api').setLevel(logging.DEBUG)
        logging.getLogger('rpc_api').setLevel(logging.DEBUG)
        logging.getLogger('werkzeug').setLevel(logging.DEBUG)

    # Use lat/lng directly if matches such a pattern.
    prog = re.compile("^(\-?\d+\.\d+),?\s?(\-?\d+\.\d+)$")
    res = prog.match(args.location)
    if res:
        log.debug('Using coordinates from CLI directly')
        position = (float(res.group(1)), float(res.group(2)), 0)
    else:
        log.debug('Looking up coordinates in API')
        position = util.get_pos_by_name(args.location)

    if position is None or not any(position):
        log.error("Location not found: '{}'".format(args.location))
        sys.exit()
    # Use the latitude and longitude to get the local altitude from Google.
    try:
        url = ('https://maps.googleapis.com/maps/api/elevation/json?' +
               'locations={},{}').format(str(position[0]), str(position[1]))
        altitude = requests.get(url).json()[u'results'][0][u'elevation']
        log.debug('Local altitude is: %sm', altitude)
        position = (position[0], position[1], altitude)
    except (requests.exceptions.RequestException, IndexError, KeyError):
        log.error('Unable to retrieve altitude from Google APIs; setting to 0')

    log.info('Parsed location is: %.4f/%.4f/%.4f (lat/lng/alt)',
             position[0], position[1], position[2])

    if args.no_pokemon:
        log.info('Parsing of Pokemon disabled.')
    if args.no_pokestops:
        log.info('Parsing of Pokestops disabled.')
    if args.no_gyms:
        log.info('Parsing of Gyms disabled.')
    if args.encounter:
        log.info('Encountering pokemon enabled.')

    config['LOCALE'] = args.locale
    config['CHINA'] = args.china

    app = Pogom(__name__)
    db = init_database(app)
    if args.clear_db:
        log.info('Clearing database')
        if args.db_type == 'mysql':
            drop_tables(db)
        elif os.path.isfile(args.db):
            os.remove(args.db)
    create_tables(db)

    app.set_current_location(position)

    # Control the search status (running or not) across threads.
    pause_bit = Event()
    pause_bit.clear()
    if args.on_demand_timeout > 0:
        pause_bit.set()

    heartbeat = [now()]

    # Setup the location tracking queue and push the first location on.
    new_location_queue = Queue()
    new_location_queue.put(position)

    # DB Updates
    db_updates_queue = Queue()

    # Thread(s) to process database updates.
    for i in range(args.db_threads):
        log.debug('Starting db-updater worker thread %d', i)
        t = Thread(target=db_updater, name='db-updater-{}'.format(i),
                   args=(args, db_updates_queue, db))
        t.daemon = True
        t.start()

    # db cleaner; really only need one ever.
    if not args.disable_clean:
        t = Thread(target=clean_db_loop, name='db-cleaner', args=(args,))
        t.daemon = True
        t.start()

    # WH updates queue & WH gym/pokéstop unique key LFU cache.
    # The LFU cache will stop the server from resending the same data an
    # infinite number of times.
    # TODO: Rework webhooks entirely so a LFU cache isn't necessary.
    wh_updates_queue = Queue()
    wh_key_cache = LFUCache(maxsize=args.wh_lfu_size)

    # Thread to process webhook updates.
    for i in range(args.wh_threads):
        log.debug('Starting wh-updater worker thread %d', i)
        t = Thread(target=wh_updater, name='wh-updater-{}'.format(i),
                   args=(args, wh_updates_queue, wh_key_cache))
        t.daemon = True
        t.start()

    if not args.only_server:

        # Processing proxies if set (load from file, check and overwrite old
        # args.proxy with new working list)
        args.proxy = check_proxies(args)

        # Run periodical proxy refresh thread
        if (args.proxy_file is not None) and (args.proxy_refresh > 0):
            t = Thread(target=proxies_refresher,
                       name='proxy-refresh', args=(args,))
            t.daemon = True
            t.start()
        else:
            log.info('Periodical proxies refresh disabled.')

        # Gather the Pokemon!

        # Attempt to dump the spawn points (do this before starting threads of
        # endure the woe).
        if (args.spawnpoint_scanning and
                args.spawnpoint_scanning != 'nofile' and
                args.dump_spawnpoints):
            with open(args.spawnpoint_scanning, 'w+') as file:
                log.info('Saving spawn points to %s', args.spawnpoint_scanning)
                spawns = Pokemon.get_spawnpoints_in_hex(
                    position, args.step_limit)
                file.write(json.dumps(spawns))
                log.info('Finished exporting spawn points')

        argset = (args, new_location_queue, pause_bit,
                  heartbeat, db_updates_queue, wh_updates_queue)

        log.debug('Starting a %s search thread', args.scheduler)
        search_thread = Thread(target=search_overseer_thread,
                               name='search-overseer', args=argset)
        search_thread.daemon = True
        search_thread.start()

    if args.cors:
        CORS(app)

    # No more stale JS.
    init_cache_busting(app)

    app.set_search_control(pause_bit)
    app.set_heartbeat_control(heartbeat)
    app.set_location_queue(new_location_queue)

    config['ROOT_PATH'] = app.root_path
    config['GMAPS_KEY'] = args.gmaps_key

    if args.no_server:
        # This loop allows for ctrl-c interupts to work since flask won't be
        # holding the program open.
        while search_thread.is_alive():
            time.sleep(60)
    else:
        ssl_context = None
        if (args.ssl_certificate and args.ssl_privatekey and
                os.path.exists(args.ssl_certificate) and
                os.path.exists(args.ssl_privatekey)):
            ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLSv1_2)
            ssl_context.load_cert_chain(
                args.ssl_certificate, args.ssl_privatekey)
            log.info('Web server in SSL mode.')
        if args.verbose or args.very_verbose:
            app.run(threaded=True, use_reloader=False, debug=True,
                    host=args.host, port=args.port, ssl_context=ssl_context)
        else:
            app.run(threaded=True, use_reloader=False, debug=False,
                    host=args.host, port=args.port, ssl_context=ssl_context)


if __name__ == '__main__':
    main()