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index.py
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index.py
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#!/usr/bin/env python
# Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
# Permission is hereby granted, free of charge, to any person obtaining a copy of this
# software and associated documentation files (the "Software"), to deal in the Software
# without restriction, including without limitation the rights to use, copy, modify,
# merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
# PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
##import required libraries
import json
from datetime import datetime, timedelta
import boto3
import os
import requests
import re
import math
from bs4 import BeautifulSoup
## Set up our DDB connection. Will use a default table that needs to be created outside of the function
DYNAMODB = boto3.resource('dynamodb')
if 'DDB_TABLE' in os.environ and os.environ['DDB_TABLE'] != '':
print("Found DDB_TABLE: "+str(os.environ['DDB_TABLE']))
MYTABLE = DYNAMODB.Table(os.environ['DDB_TABLE'])
else:
print("ERROR: Unable to find DynamoDB table in Environment Variables, defaulting to EventsTable-Demo")
MYTABLE = DYNAMODB.Table('EventsTable-Demo')
## Get the number of days of events to process
if 'CRAWLER_DAYS' in os.environ and os.environ['CRAWLER_DAYS'] != '':
print("Found CRAWLER_DAYS: "+str(os.environ['CRAWLER_DAYS']))
CRAWLER_DAYS = int(os.environ['CRAWLER_DAYS'])
else:
print("ERROR: Unable to find the number of days to crawl in Environment Variables, defaulting to 7")
CRAWLER_DAYS = 7
## constants
HEADERS = {'User-Agent': "Example crawler script that parses events from NYC Parks Events site, no malicious intent"}
TODAY=datetime.today().strftime('%Y-%m-%d')
TODAY_PLUS=(datetime.today()+timedelta(days=CRAWLER_DAYS)).strftime('%Y-%m-%d')
URL = 'https://www.nycgovparks.org/events'
PAGE_URL=URL+"/f"+TODAY+"/t"+TODAY_PLUS
ALL_EVENTS_IDENTIFIER = 'events_leftcol'
EACH_EVENT_IDENTIFIER = 'http://schema.org/Event'
## used to help figure out the number of pages to crawl
def roundup(x):
return int(math.ceil(x / 10.0)) * 10
## Crawls the intial search results page and determines based on the number of overall results the number
## of pages that it will need to parse
def getPages():
print("INFO: Trying to read: "+PAGE_URL)
page = requests.get(PAGE_URL, headers=HEADERS)
content = BeautifulSoup(page.content, 'html.parser')
alert_content = content.find('p', {'class': "alert"}).get_text()
total_events = re.search('out of ([0-9,]*) events', alert_content)
print("INFO: Found "+str(total_events.group(1).replace(',', ''))+" events listed")
total_pages = roundup(int(total_events.group(1).replace(',', ''))) / 10
return total_pages
## Get all of the events from a given page identified by the passed in page_counter
def getAllEvents(page_counter):
all_events_list = {}
## get the page
page = requests.get(PAGE_URL+'/p'+str(page_counter), headers=HEADERS)
content = BeautifulSoup(page.content, 'html.parser')
all_events = content.find('div', {'id': ALL_EVENTS_IDENTIFIER})
## grab event
all_events_list = all_events.find_all('div', {'itemtype': EACH_EVENT_IDENTIFIER})
##print (all_events_list[1].prettify())
return all_events_list
## parse out all of the event details from a given page's events
def parseEvents(all_events_list):
event_info={}
all_events_details=[]
event_categories=[]
for counter in range(len(all_events_list)):
event_info['month'] = all_events_list[counter].find('span', {'class': 'cal_month'}).get_text()
event_info['day'] = all_events_list[counter].find('span', {'class': 'cal_day'}).get_text()
event_info['location'] = all_events_list[counter].find('span', {'itemprop': 'name'}).get_text()
event_info['name'] = all_events_list[counter].find('h3', {'itemprop': 'name'}).get_text()
name_item = all_events_list[counter].find('h3', {'itemprop': 'name'}).findChildren()
event_info['startDate'] = all_events_list[counter].find('meta', {'itemprop': 'startDate'}).attrs['content']
event_info['endDate'] = all_events_list[counter].find('meta', {'itemprop': 'endDate'}).attrs['content']
event_info['id'] = name_item[0].attrs['href']
## The below represent attributes that might be missing from events and need to be defaulted to null otherwise
if all_events_list[counter].find('span', {'itemprop': 'addressLocality'}):
event_info['borough'] = all_events_list[counter].find('span', {'itemprop': 'addressLocality'}).get_text()
else:
event_info['borough'] = 'null'
if all_events_list[counter].find('meta', {'itemprop': 'streetAddress'}):
event_info['streetAddress'] = all_events_list[counter].find('meta', {'itemprop': 'streetAddress'}).attrs['content']
else:
event_info['streetAddress'] = 'null'
if all_events_list[counter].find('span', {'itemprop': 'description'}).get_text():
event_info['description'] = all_events_list[counter].find('span', {'itemprop': 'description'}).get_text()
else:
event_info['description'] = 'null'
if all_events_list[counter].find_all('span', {'class': None, 'itemprop' : None}):
span_events = all_events_list[counter].find_all('span', {'class': None, 'itemprop' : None})
for span_counter in range(len(span_events)):
event_categories.append(span_events[span_counter].get_text())
event_info['categories'] = event_categories
else:
event_info['categories'] = 'null'
#print json.dumps(event_info, indent=4, sort_keys=True)
all_events_details.append(event_info)
##the following weren't taking the new data in this loop, so forcefully clear it here. i'm not understanding
## something about python var scope ;)
event_info={}
span_events={}
event_categories=[]
return all_events_details
## Store in DynamoDB the results of our parsed event data
def ddbWriter(all_events_details):
with MYTABLE.batch_writer() as batch:
item_counter=0
while item_counter<len(all_events_details):
item=all_events_details[item_counter]
##For Debugging: print json.dumps(item, indent=4, sort_keys=True)
batch.put_item(
Item=item
)
item_counter +=1
## Lambda handler
def handler(event, context):
total_pages = getPages()
page_counter=1
while page_counter <= total_pages:
all_events_list = getAllEvents(page_counter)
all_events_details = parseEvents(all_events_list)
ddbWriter(all_events_details)
all_events_details = {}
all_events_list = {}
page_counter+=1
return("Success! Parsed Events")