def run_flask():
CrawlGlobal.context().logger.info("start flask with host: %s",
CRAWLER_HOSTNAME)
app.run(debug=DEBUG_MODE,
host=CRAWLER_HOSTNAME,
port=PORT,
use_reloader=False)
def run(self, text):
CrawlGlobal.context().logger.info("start running the model")
try:
pred = self.make_prediction(text)
return pred
except Exception as e:
CrawlGlobal.context().logger.info(
"exception thrown while running model %s", str(e))
def construct_model(self):
try:
CrawlGlobal.context().logger.info("deserailizing the model")
self.new_vectorizer = pickle.load(open("vectorizer.pickle", "rb"))
self.model = pickle.load(open(self.model_file, "rb"))
except Exception as e:
CrawlGlobal.context().logger.info("error in deserializing: %s",
str(e))
def test_store_in_redis(self):
CrawlGlobal.context().cache.rediscache = fakeredis.FakeStrictRedis()
links = ["x","y","z"]
storageuri ="abc"
self.scraper.store_in_redis(storageuri,links)
val = CrawlGlobal.context().cache.get(self.url)
self.assertEqual(val, {"storage_uri": "abc", "child_urls": ["x", "y", "z"]})
def crawl():
url = flask.request.json['url']
CrawlGlobal.context().logger.info('Crawling %s', url)
if CrawlGlobal.context().active_thread_count.get() >= MAX_ACTIVE_THREADS:
return flask.jsonify({'accepted': False})
CrawlGlobal.context().active_thread_count.increment()
crawljob = CrawlerJob(url)
executor.submit(crawljob.execute, CRAWLER_MANAGER_ENDPOINT)
return flask.jsonify({'accepted': True})
def start_scrape(self):
url = self.base_url
CrawlGlobal.context().logger.info('start scraping')
key = 'crawl_pages/{}'.format(str(uuid.uuid4()))
CrawlGlobal.context().logger.info('Generated key: %s', key)
file_ext = self.get_extension(url)
# scraper object is decided (FileScraper, WebScraper, BaseScraper)
if file_ext:
scraper = FileScraper(url, key, file_ext)
elif not CrawlGlobal.context().is_dynamic_scrape():
scraper = BaseScraper(url, key)
else:
scraper = WebScraper(url, key)
# scrape the page
data = scraper.do_scrape()
#CrawlGlobal.context().logger.info(self.data)
# store
if self.do_store(file_ext, data):
CrawlGlobal.context().logger.info(
"need to store the data for url: %s", self.base_url)
self.storage_uri = scraper.store_in_gcs(data)
else:
CrawlGlobal.context().logger.info(
"not storing the data for url: %s", self.base_url)
# get child urls
self.links = scraper.get_links(data)
# put in cache
scraper.store_in_redis(self.storage_uri, self.links)
def do_scrape(self):
CrawlGlobal.context().logger.info("Using Base Scraper")
CrawlGlobal.context().logger.info("Scraping URL: {}".format(
self.base_url))
try:
response = requests.get(self.base_url)
response.raise_for_status()
return response.content
except Exception as e:
return None
def setup():
try:
CrawlGlobal.context().logger.info("crawler end point: %s", ENDPOINT)
CrawlGlobal.context().logger.info("crawler manager end point: %s",
CRAWLER_MANAGER_ENDPOINT)
res = requests.post(os.path.join(CRAWLER_MANAGER_ENDPOINT,
'register_crawler'),
json={'endpoint': ENDPOINT})
CrawlGlobal.context().logger.info(
"Registreed successfully with crawler manager")
CrawlGlobal.context().set_useroptions(res.json())
except Exception as e:
CrawlGlobal.context().logger.info(
'Unable to register with crawler manager: %s', str(e))
def store_in_redis(self, storageuri, links):
try:
CrawlGlobal.context().logger.info(
'Caching storage_uri and child_urls')
CrawlGlobal.context().cache.put(self.base_url, {
'storage_uri': storageuri,
'child_urls': links
})
CrawlGlobal.context().logger.info('Caching was successful')
except Exception as e:
CrawlGlobal.context().logger.error(
'Unable to cache data for %s: %s', self.base_url, str(e))
def store_in_gcs(self, fpath):
CrawlGlobal.context().logger.info('Attempting to store in GCS')
if not fpath:
CrawlGlobal.context().logger.info('no file to store in GCS')
return
try:
storage_client = storage.Client()
bucket = storage_client.get_bucket(os.environ['GCS_BUCKET'])
blob = bucket.blob(self.file_name + self.file_ext)
CrawlGlobal.context().logger.info('Got the blob in GCS')
blob.upload_from_filename(fpath)
blob.make_public()
uri = blob.public_url
CrawlGlobal.context().logger.info('uri successfully generated!')
return uri
except Exception as e:
CrawlGlobal.context().logger.error(
'Unable to store webpage for %s: %s', self.base_url, str(e))
return ''
def execute(self, endpoint):
CrawlGlobal.context().logger.info('Starting crawl thread for %s',
self.base_url)
try:
if not self.is_cached() or CrawlGlobal.context().has_model():
self.start_scrape()
else:
CrawlGlobal.context().logger.info('Url %s already cached',
self.base_url)
# callback manager
self.send_response_to_manager(endpoint)
except Exception as e:
CrawlGlobal.context().logger.info("exception: {}".format(str(e)))
CrawlGlobal.context().active_thread_count.decrement()
def do_scrape(self):
if not self.is_valid():
return super(WebScraper,self).do_scrape()
CrawlGlobal.context().logger.info("Using Web Scraper")
try:
CrawlGlobal.context().logger.info("Scraping URL: {}".format(self.base_url))
return CrawlGlobal.context().get_data(self.base_url)
except Exception as e:
CrawlGlobal.context().logger.info("error in scraping: {}".format(str(e)))
return None
def test_connections():
try:
CrawlGlobal.context().cache.ping()
CrawlGlobal.context().logger.info('connected to redis successfully')
except Exception as e:
CrawlGlobal.context().logger.info('could not initialize redis: %s',
str(e))
def do_store(self, ext, data):
docs_all = CrawlGlobal.context().scrape_all
docs_pdf = CrawlGlobal.context().scrape_pdf
docs_docx = CrawlGlobal.context().scrape_docx
if ext or not CrawlGlobal.context().has_model():
if ((docs_all == True) or (ext == '.pdf' and docs_pdf == True)
or (ext == '.docx' and docs_docx == True)
or (docs_pdf == False and docs_docx == False
and docs_all == False)):
return True
else:
CrawlGlobal.context().logger.info(
'Non model: No matching doc type')
return False
else:
if ((docs_all == True) or (docs_pdf == False and docs_docx == False
and docs_all == False)):
cur_pred = CrawlGlobal.context().modelrunner.run(data)
return cur_pred == -1 or CrawlGlobal.context().has_label(
cur_pred)
else:
CrawlGlobal.context().logger.info(
'Model: No matching doc type')
return False
def ping_crawler_manager():
try:
CrawlGlobal.context().logger.info(
'pinging CRAWLER_MANAGER_ENDPOINT - %s', CRAWLER_MANAGER_ENDPOINT)
response = requests.get(CRAWLER_MANAGER_ENDPOINT)
response.raise_for_status()
CrawlGlobal.context().logger.info('ping successful!')
except Exception as e:
CrawlGlobal.context().logger.error(
"Could not connect to crawler manager: %s", str(e))
def make_prediction(self, text):
try:
CrawlGlobal.context().logger.info("transforming and predicting")
vectors = self.new_vectorizer.transform([text])
prediction = self.model.predict(vectors)
CrawlGlobal.context().logger.info("model predicted: %d",
prediction[0])
return prediction[0]
except Exception as e:
CrawlGlobal.context().logger.info("error in predicting: %s",
str(e))
return -1
def kill():
if ENVIRONMENT == 'local':
CrawlGlobal.context().logger.info(
'Not killing crawler because running locally')
else:
CrawlGlobal.context().logger.info(
"Will kill flask server in 3 seconds")
kill_thread = threading.Thread(target=kill_main_thread)
kill_thread.start()
CrawlGlobal.context().logger.info('Kill called')
return "ok"
def send_response_to_manager(self, endpoint):
links_api = os.path.join(endpoint, 'links')
CrawlGlobal.context().logger.info('Endpoint on Crawler manager: %s',
links_api)
try:
CrawlGlobal.context().logger.info(
'Sending response back to crawler manager...')
response = requests.post(links_api,
json={
'main_url': self.base_url,
'storage_uri': self.storage_uri,
'child_urls': self.links
})
response.raise_for_status()
CrawlGlobal.context().logger.info('Response sent successfully!')
return response
except Exception as e:
CrawlGlobal.context().logger.error(
"Could not connect to crawler manager: %s", str(e))
return None
def is_cached(self):
CrawlGlobal.context().logger.info('connecting to redis')
if CrawlGlobal.context().cache.exists(self.base_url):
cache_val = CrawlGlobal.context().cache.get(self.base_url)
if cache_val != None and 'storage_uri' in cache_val and 'child_urls' in cache_val:
self.storage_uri = cache_val['storage_uri']
self.links = cache_val['child_urls']
if (self.storage_uri is None):
CrawlGlobal.context().logger.info(
'Error condition. storage_uri None for cached url: %s',
self.base_url)
self.storage_uri = ''
if (self.links is None):
CrawlGlobal.context().logger.info(
'Error condition. links None for cached url: %s',
self.base_url)
self.links = []
return True
else:
return False
return False
def do_scrape(self):
try:
CrawlGlobal.context().logger.info("Scraping URL: {}".format(
self.base_url))
r = requests.get(self.base_url, stream=True)
CrawlGlobal.context().logger.info("request status: %d",
r.status_code)
tmpfile = self.file_name
if (self.file_name.startswith('crawl_pages/')):
tmpfile = self.file_name[len('crawl_pages/'):]
fpath = '/tmp/' + tmpfile + self.file_ext
CrawlGlobal.context().logger.info("file path is: %s", fpath)
with open(fpath, 'wb') as fd:
for chunk in r.iter_content(self.chunk_size):
fd.write(chunk)
return fpath
except Exception as e:
CrawlGlobal.context().logger.info("error in writing file: %s",
str(e))
return None
def store_in_gcs(self, data):
if data is None:
return ''
CrawlGlobal.context().logger.info('Attempting to store in GCS')
try:
storage_client = storage.Client()
bucket = storage_client.get_bucket(os.environ['GCS_BUCKET'])
blob = bucket.blob(self.file_name)
blob.upload_from_string(data)
blob.make_public()
uri = blob.public_url
CrawlGlobal.context().logger.info('uri successfully generated!')
return uri
except Exception as e:
CrawlGlobal.context().logger.error(
'Unable to store webpage for %s: %s', url, str(e))
return ''
def get_links(self, data):
if data is None:
return []
CrawlGlobal.context().logger.info('Parsing links...')
try:
bs_obj = BeautifulSoup(data, 'html.parser')
links_obj = {}
for link in bs_obj.find_all('a'):
if 'href' in link.attrs:
links_obj[link.attrs['href']] = 1
links = list(links_obj.keys())
CrawlGlobal.context().logger.info('Found links in %s: %s',
self.base_url, str(links))
return links
except Exception as e:
CrawlGlobal.context().logger.error(
"Could not list links in url: %s", str(e))
return []
def is_valid(self):
return True if CrawlGlobal.context().get_driver() else False
def __init__(self, base_url, key):
CrawlGlobal.context().logger.info("instantiating web scraper")
BaseScraper.__init__(self, base_url, key)
def test_is_cached(self):
CrawlGlobal.context().cache.rediscache = fakeredis.FakeStrictRedis()
retval = self.crawljob.is_cached()
self.assertIs(retval, False)
def __init__(self, base_url, key, ext):
BaseScraper.__init__(self, base_url, key)
CrawlGlobal.context().logger.info("instantiating file scraper")
self.file_ext = ext
self.chunk_size = 2000
def get_extension(self, url):
CrawlGlobal.context().logger.info('url is: %s', self.base_url)
ext = list(
filter(lambda x: url.lower().endswith(x), ALLOWABLE_EXTENSIONS))[0]
CrawlGlobal.context().logger.info('extension is: %s', ext)
return ext
def status():
return flask.jsonify(
{'active_threads': CrawlGlobal.context().active_thread_count.get()})
def kill_main_thread():
time.sleep(3)
CrawlGlobal.context().logger.info("Kill confirmed")
os._exit(0)
json={'endpoint': ENDPOINT})
CrawlGlobal.context().logger.info(
"Registreed successfully with crawler manager")
CrawlGlobal.context().set_useroptions(res.json())
except Exception as e:
CrawlGlobal.context().logger.info(
'Unable to register with crawler manager: %s', str(e))
def ping_crawler_manager():
try:
CrawlGlobal.context().logger.info(
'pinging CRAWLER_MANAGER_ENDPOINT - %s', CRAWLER_MANAGER_ENDPOINT)
response = requests.get(CRAWLER_MANAGER_ENDPOINT)
response.raise_for_status()
CrawlGlobal.context().logger.info('ping successful!')
except Exception as e:
CrawlGlobal.context().logger.error(
"Could not connect to crawler manager: %s", str(e))
if __name__ == "__main__":
ping_crawler_manager()
test_connections()
CrawlGlobal.context().logger.info('ENVIRONMENT -- %s ', ENVIRONMENT)
CrawlGlobal.context().logger.info('starting flask app in separate thread')
flask_thread = threading.Thread(target=run_flask)
flask_thread.start()
if ENVIRONMENT != 'local':
setup()