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#vim: fileencoding=utf-8
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"""
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The proxy server acts as a backend for the wttr.in service.
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It caches the answers and handles various data sources transforming their
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answers into format supported by the wttr.in service.
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If WTTRIN_TEST is specified, it works in a special test mode:
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it does not fetch and does not store the data in the cache,
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but is using the fake data from "test/proxy-data".
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"""
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from __future__ import print_function
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from gevent.pywsgi import WSGIServer
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from gevent.monkey import patch_all
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patch_all()
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# pylint: disable=wrong-import-position,wrong-import-order
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import sys
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import os
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import time
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import json
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import hashlib
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import requests
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import cyrtranslit
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from flask import Flask, request
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APP = Flask(__name__)
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MYDIR = os.path.abspath(
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os.path.dirname(os.path.dirname('__file__')))
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sys.path.append("%s/lib/" % MYDIR)
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from globals import PROXY_CACHEDIR, PROXY_HOST, PROXY_PORT
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from translations import PROXY_LANGS
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# pylint: enable=wrong-import-position
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def is_testmode():
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"""Server is running in the wttr.in test mode"""
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return "WTTRIN_TEST" in os.environ
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def load_translations():
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"""
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load all translations
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"""
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translations = {}
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for f_name in PROXY_LANGS:
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f_name = 'share/translations/%s.txt' % f_name
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translation = {}
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lang = f_name.split('/')[-1].split('.', 1)[0]
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with open(f_name, "r") as f_file:
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for line in f_file:
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if ':' not in line:
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continue
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if line.count(':') == 3:
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_, trans, orig, _ = line.strip().split(':', 4)
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else:
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_, trans, orig = line.strip().split(':', 3)
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trans = trans.strip()
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orig = orig.strip()
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translation[orig] = trans
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translations[lang] = translation
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return translations
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TRANSLATIONS = load_translations()
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def _find_srv_for_query(path, query): # pylint: disable=unused-argument
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return 'http://api.worldweatheronline.com'
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def _cache_file(path, query):
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"""Return cache file name for specified `path` and `query`
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and for the current time.
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Do smooth load on the server, expiration time
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is slightly varied basing on the path+query sha1 hash digest.
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"""
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digest = hashlib.sha1(("%s %s" % (path, query)).encode("utf-8")).hexdigest()
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digest_number = ord(digest[0].upper())
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expiry_interval = 60*(digest_number+40)
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timestamp = "%010d" % (int(time.time())//expiry_interval*expiry_interval)
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filename = os.path.join(PROXY_CACHEDIR, timestamp, path, query)
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return filename
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def _load_content_and_headers(path, query):
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if is_testmode():
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cache_file = "test/proxy-data/data1"
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else:
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cache_file = _cache_file(path, query)
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try:
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return (open(cache_file, 'r').read(),
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json.loads(open(cache_file+".headers", 'r').read()))
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except IOError:
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return None, None
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def _touch_empty_file(path, query):
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cache_file = _cache_file(path, query)
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cache_dir = os.path.dirname(cache_file)
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if not os.path.exists(cache_dir):
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os.makedirs(cache_dir)
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open(cache_file, 'w').write("")
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def _save_content_and_headers(path, query, content, headers):
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cache_file = _cache_file(path, query)
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cache_dir = os.path.dirname(cache_file)
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if not os.path.exists(cache_dir):
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os.makedirs(cache_dir)
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open(cache_file + ".headers", 'w').write(json.dumps(headers))
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open(cache_file, 'wb').write(content)
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def translate(text, lang):
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"""
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Translate `text` into `lang`
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"""
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translated = TRANSLATIONS.get(lang, {}).get(text, text)
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if text == translated:
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print("%s: %s" % (lang, text))
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return translated
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def cyr(to_translate):
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"""
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Transliterate `to_translate` from latin into cyrillic
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"""
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return cyrtranslit.to_cyrillic(to_translate)
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def _patch_greek(original):
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return original.replace(u"Ηλιόλουστη/ο", u"Ηλιόλουστη")
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def add_translations(content, lang):
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"""
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Add `lang` translation to `content` (JSON)
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returned by the data source
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"""
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if content == "{}":
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return {}
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languages_to_translate = TRANSLATIONS.keys()
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try:
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d = json.loads(content) # pylint: disable=invalid-name
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except (ValueError, TypeError) as exception:
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print("---")
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print(exception)
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print("---")
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return {}
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try:
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weather_condition = d['data']['current_condition'
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][0]['weatherDesc'][0]['value'].capitalize()
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d['data']['current_condition'][0]['weatherDesc'][0]['value'] = \
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weather_condition
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if lang in languages_to_translate:
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d['data']['current_condition'][0]['lang_%s' % lang] = \
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[{'value': translate(weather_condition, lang)}]
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elif lang == 'sr':
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d['data']['current_condition'][0]['lang_%s' % lang] = \
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[{'value': cyr(
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d['data']['current_condition'][0]['lang_%s' % lang][0]['value']\
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)}]
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elif lang == 'el':
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d['data']['current_condition'][0]['lang_%s' % lang] = \
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[{'value': _patch_greek(
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d['data']['current_condition'][0]['lang_%s' % lang][0]['value']\
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)}]
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elif lang == 'sr-lat':
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d['data']['current_condition'][0]['lang_%s' % lang] = \
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[{'value':d['data']['current_condition'][0]['lang_sr'][0]['value']\
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}]
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fixed_weather = []
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for w in d['data']['weather']: # pylint: disable=invalid-name
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fixed_hourly = []
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for h in w['hourly']: # pylint: disable=invalid-name
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weather_condition = h['weatherDesc'][0]['value']
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if lang in languages_to_translate:
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h['lang_%s' % lang] = \
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[{'value': translate(weather_condition, lang)}]
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elif lang == 'sr':
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h['lang_%s' % lang] = \
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[{'value': cyr(h['lang_%s' % lang][0]['value'])}]
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elif lang == 'el':
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h['lang_%s' % lang] = \
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[{'value': _patch_greek(h['lang_%s' % lang][0]['value'])}]
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elif lang == 'sr-lat':
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h['lang_%s' % lang] = \
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[{'value': h['lang_sr'][0]['value']}]
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fixed_hourly.append(h)
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w['hourly'] = fixed_hourly
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fixed_weather.append(w)
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d['data']['weather'] = fixed_weather
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content = json.dumps(d)
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except (IndexError, ValueError) as exception:
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print(exception)
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return content
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@APP.route("/<path:path>")
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def proxy(path):
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"""
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Main proxy function. Handles incoming HTTP queries.
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"""
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lang = request.args.get('lang', 'en')
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query_string = request.query_string.decode("utf-8")
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query_string = query_string.replace('sr-lat', 'sr')
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query_string = query_string.replace('lang=None', 'lang=en')
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query_string += "&extra=localObsTime"
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query_string += "&includelocation=yes"
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content, headers = _load_content_and_headers(path, query_string)
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if content is None:
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srv = _find_srv_for_query(path, query_string)
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url = '%s/%s?%s' % (srv, path, query_string)
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attempts = 10
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response = None
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while attempts:
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try:
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response = requests.get(url, timeout=2)
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except requests.ReadTimeout:
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attempts -= 1
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continue
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try:
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json.loads(response.content)
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break
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except ValueError:
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attempts -= 1
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_touch_empty_file(path, query_string)
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if response:
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headers = {}
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headers['Content-Type'] = response.headers['content-type']
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_save_content_and_headers(path, query_string, response.content, headers)
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content = response.content
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else:
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content = "{}"
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else:
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print("cache found")
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content = add_translations(content, lang)
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return content, 200, headers
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if __name__ == "__main__":
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#app.run(host='0.0.0.0', port=5001, debug=False)
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#app.debug = True
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bind_addr = "0.0.0.0"
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SERVER = WSGIServer((bind_addr, PROXY_PORT), APP)
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SERVER.serve_forever()
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