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event_consumer.py
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event_consumer.py
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#!/usr/bin/env python
# Code adapted from https://github.com/pushlog/RsvpAnalytics
# Kakfa Library
from kafka import KafkaConsumer
# Custom Code Imports
from database import Eventstream # Cassandra Model
from util import get_dict_val, load_json, datetime_from_epoch # util functions
# Managing schemas
from cqlengine.management import sync_table, create_keyspace
# Setup connection
from cqlengine import connection
# Kafka broker
kafka_brokers_list = ["localhost:9092"] # We can put multiple brokers here.
group_id = "meetup_event_stream" # group id of topics
# Kafka Consumer
consumer = KafkaConsumer("eventstream", group_id=group_id)
# Connect to the meetup keyspace on our cluster running at 127.0.0.1
connection.setup(['127.0.0.1'], "meetup")
# create keyspace
# keyspace name, keyspace replication strategy, replication factor
create_keyspace('meetup', 'SimpleStrategy', 1)
# Sync your model with your cql table
sync_table(Eventstream)
def write_to_cassandra(**kwargs):
"""
Write the data to cassandra.
"""
try:
Eventstream.create(
status=get_dict_val(kwargs, 'status'),
venue_name=get_dict_val(kwargs, 'venue_name'),
venue_lon=get_dict_val(kwargs, 'venue_lon'),
venue_lat=get_dict_val(kwargs, 'venue_lat'),
venue_id=get_dict_val(kwargs, 'venue_id'),
venue_zip=get_dict_val(kwargs, 'venue_zip'),
venue_city=get_dict_val(kwargs, 'venue_city'),
venue_state=get_dict_val(kwargs, 'venue_state'),
venue_country=get_dict_val(kwargs, 'venue_country'),
event_id=get_dict_val(kwargs, 'event_id'),
event_name=get_dict_val(kwargs, 'event_name'),
event_last_modified_time=get_dict_val(kwargs,
'event_last_modified_time'),
event_url=get_dict_val(kwargs, 'event_url'),
event_time=get_dict_val(kwargs, 'event_time'),
group_name=get_dict_val(kwargs, 'group_name'),
group_url=get_dict_val(kwargs, 'group_url'),
group_id=get_dict_val(kwargs, 'group_id'),
venue_addy1=get_dict_val(kwargs, 'venue_addy1'),
venue_addy2=get_dict_val(kwargs, 'venue_addy2'),
venue_addy3=get_dict_val(kwargs, 'venue_addy3'),
venue_phone=get_dict_val(kwargs, 'venue_phone'),
category_id=get_dict_val(kwargs, 'category_id'),
cat_name=get_dict_val(kwargs, 'cat_name'),
cat_shortname=get_dict_val(kwargs, 'cat_shortname'),
yes_rsvp_count=get_dict_val(kwargs, 'yes_rsvp_count'))
except Exception, e:
print e
def fetch_data():
"""
If data exists, load data using json.
Get values out of json dict.
Call write_to_cassandra to write the values to Cassandra.
"""
if consumer:
for message in consumer:
message = load_json(message.value) # Convert to json
status = get_dict_val(message, 'status')
event_id = get_dict_val(message, 'id')
event_name = get_dict_val(message, 'name')
event_url = get_dict_val(message, 'event_url')
yes_rsvp_count = get_dict_val(message, 'yes_rsvp_count')
# Venue hosting the event
venue = get_dict_val(message, 'venue')
if venue:
venue_name = get_dict_val(venue, 'name')
venue_lon = get_dict_val(venue, 'lon')
venue_lat = get_dict_val(venue, 'lat')
venue_id = get_dict_val(venue, 'id')
venue_zip = get_dict_val(venue, 'zip')
venue_city = get_dict_val(venue, 'city')
venue_state = get_dict_val(venue, 'state')
venue_country = get_dict_val(venue, 'country')
venue_addy1 = get_dict_val(venue, 'address_1')
venue_addy2 = get_dict_val(venue, 'address_2')
venue_addy3 = get_dict_val(venue, 'address_3')
venue_phone = get_dict_val(venue, 'phone')
else:
venue_name = None
venue_lon = None
venue_lat = None
venue_id = None
venue_zip = None
venue_city = None
venue_state = None
venue_country = None
venue_addy1 = None
venue_addy2 = None
venue_addy3 = None
venue_phone = None
# since epoch
mtime = get_dict_val(message, 'mtime')
if mtime:
event_last_modified_time = datetime_from_epoch(mtime)
else:
event_last_modified_time = None
e_time = get_dict_val(message, 'time')
if e_time:
event_time = datetime_from_epoch(e_time)
else:
event_time = None
# Group hosting the event
group = get_dict_val(message, 'group')
if group:
category = get_dict_val(group, 'category')
if category:
category_id = get_dict_val(category, 'id')
cat_name = get_dict_val(category, 'name')
cat_shortname = get_dict_val(category, 'shortname')
else:
category_id = None
cat_name = None
cat_shortname = None
group_id = get_dict_val(group, 'id')
group_name = get_dict_val(group, 'name')
group_url = get_dict_val(group, 'urlname')
else:
group_id = None
group_name = None
group_url = None
# Write data to Cassandra database
write_to_cassandra(status=status,
event_time=event_time,
event_name=event_name,
event_id=event_id,
event_url=event_url,
venue_name=venue_name,
venue_lon=venue_lon,
venue_lat=venue_lat,
venue_id=venue_id,
venue_zip=venue_zip,
venue_city=venue_city,
venue_state=venue_state,
venue_country=venue_country,
event_last_modified_time=event_last_modified_time,
group_id=group_id,
group_name=group_name,
group_url=group_url,
venue_addy1=venue_addy1,
venue_addy2=venue_addy2,
venue_addy3=venue_addy3,
venue_phone=venue_phone,
category_id=category_id,
cat_name=cat_name,
cat_shortname=cat_shortname,
yes_rsvp_count=yes_rsvp_count
)
if __name__ == '__main__':
fetch_data()