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module Agents
class TwitterStreamAgent < Agent
include TwitterConcern
include LongRunnable
cannot_receive_events!
description <<-MD
The Twitter Stream Agent follows the Twitter stream in real time, watching for certain keywords, or filters, that you provide.
#{twitter_dependencies_missing if dependencies_missing?}
To follow the Twitter stream, provide an array of `filters`. Multiple words in a filter must all show up in a tweet, but are independent of order.
If you provide an array instead of a filter, the first entry will be considered primary and any additional values will be treated as aliases.
To be able to use this Agent you need to authenticate with Twitter in the [Services](/services) section first.
Set `expected_update_period_in_days` to the maximum amount of time that you'd expect to pass between Events being created by this Agent.
`generate` should be either `events` or `counts`. If set to `counts`, it will output event summaries whenever the Agent is scheduled.
MD
event_description <<-MD
When in `counts` mode, TwitterStreamAgent events look like:
{
"filter": "hello world",
"count": 25,
"time": 3456785456
}
When in `events` mode, TwitterStreamAgent events look like:
{
"filter": "selectorgadget",
... every Tweet field, including ...
"text": "something",
"user": {
"name": "Mr. Someone",
"screen_name": "Someone",
"location": "Vancouver BC Canada",
"description": "...",
"followers_count": 486,
"friends_count": 1983,
"created_at": "Mon Aug 29 23:38:14 +0000 2011",
"time_zone": "Pacific Time (US & Canada)",
"statuses_count": 3807,
"lang": "en"
},
"retweet_count": 0,
"entities": ...
"lang": "en"
}
MD
default_schedule "11pm"
def validate_options
unless options['filters'].present? &&
options['expected_update_period_in_days'].present? &&
options['generate'].present?
errors.add(:base, "expected_update_period_in_days, generate, and filters are required fields")
end
end
def working?
event_created_within?(interpolated['expected_update_period_in_days']) && !recent_error_logs?
end
def default_options
{
'filters' => %w[keyword1 keyword2],
'expected_update_period_in_days' => "2",
'generate' => "events"
}
end
def process_tweet(filter, status)
filter = lookup_filter(filter)
if filter
if interpolated['generate'] == "counts"
# Avoid memory pollution by reloading the Agent.
agent = Agent.find(id)
agent.memory['filter_counts'] ||= {}
agent.memory['filter_counts'][filter] ||= 0
agent.memory['filter_counts'][filter] += 1
remove_unused_keys!(agent, 'filter_counts')
agent.save!
else
create_event :payload => status.merge('filter' => filter)
end
end
end
def check
if interpolated['generate'] == "counts" && memory['filter_counts'] && memory['filter_counts'].length > 0
memory['filter_counts'].each do |filter, count|
create_event :payload => { 'filter' => filter, 'count' => count, 'time' => Time.now.to_i }
end
end
memory['filter_counts'] = {}
end
protected
def lookup_filter(filter)
interpolated['filters'].each do |known_filter|
if known_filter == filter
return filter
elsif known_filter.is_a?(Array)
if known_filter.include?(filter)
return known_filter.first
end
end
end
end
def remove_unused_keys!(agent, base)
if agent.memory[base]
(agent.memory[base].keys - agent.interpolated['filters'].map {|f| f.is_a?(Array) ? f.first.to_s : f.to_s }).each do |removed_key|
agent.memory[base].delete(removed_key)
end
end
end
def self.setup_worker
Agents::TwitterStreamAgent.active.group_by { |agent| agent.twitter_oauth_token }.map do |oauth_token, agents|
if Agents::TwitterStreamAgent.dependencies_missing?
STDERR.puts Agents::TwitterStreamAgent.twitter_dependencies_missing
STDERR.flush
return false
end
filter_to_agent_map = agents.map { |agent| agent.options[:filters] }.flatten.uniq.compact.map(&:strip).inject({}) { |m, f| m[f] = []; m }
agents.each do |agent|
agent.options[:filters].flatten.uniq.compact.map(&:strip).each do |filter|
filter_to_agent_map[filter] << agent
end
end
config_hash = filter_to_agent_map.map { |k, v| [k, v.map(&:id)] }
config_hash.push(oauth_token)
Worker.new(id: agents.first.worker_id(config_hash),
config: {filter_to_agent_map: filter_to_agent_map},
agent: agents.first)
end
end
class Worker < LongRunnable::Worker
RELOAD_TIMEOUT = 60.minutes
DUPLICATE_DETECTION_LENGTH = 1000
SEPARATOR = /[^\w_\-]+/
def setup
require 'twitter/json_stream'
@filter_to_agent_map = @config[:filter_to_agent_map]
end
def run
@recent_tweets = []
EventMachine.run do
EventMachine.add_periodic_timer(RELOAD_TIMEOUT) do
restart!
end
stream!(@filter_to_agent_map.keys, @agent) do |status|
handle_status(status)
end
end
Thread.stop
end
def stop
EventMachine.stop_event_loop if EventMachine.reactor_running?
terminate_thread!
end
private
def stream!(filters, agent, &block)
filters = filters.map(&:downcase).uniq
stream = Twitter::JSONStream.connect(
:path => "/1/statuses/#{(filters && filters.length > 0) ? 'filter' : 'sample'}.json#{"?track=#{filters.map {|f| CGI::escape(f) }.join(",")}" if filters && filters.length > 0}",
:ssl => true,
:oauth => {
:consumer_key => agent.twitter_consumer_key,
:consumer_secret => agent.twitter_consumer_secret,
:access_key => agent.twitter_oauth_token,
:access_secret => agent.twitter_oauth_token_secret
}
)
stream.each_item do |status|
block.call(status)
end
stream.on_error do |message|
STDERR.puts " --> Twitter error: #{message} at #{Time.now} <--"
STDERR.puts " --> Sleeping for 15 seconds"
sleep 15
restart!
end
stream.on_no_data do |message|
STDERR.puts " --> Got no data for awhile; trying to reconnect at #{Time.now} <--"
restart!
end
stream.on_max_reconnects do |timeout, retries|
STDERR.puts " --> Oops, tried too many times! at #{Time.now} <--"
sleep 60
restart!
end
end
def handle_status(status)
status = JSON.parse(status) if status.is_a?(String)
return unless status
return if status.has_key?('delete')
return unless status['text']
status['text'] = status['text'].gsub(/</, "<").gsub(/>/, ">").gsub(/[\t\n\r]/, ' ')
if status["retweeted_status"].present? && status["retweeted_status"].is_a?(Hash)
return
elsif @recent_tweets.include?(status["id_str"])
puts "(#{Time.now}) Skipping duplicate tweet: #{status["text"]}"
return
end
@recent_tweets << status["id_str"]
@recent_tweets.shift if @recent_tweets.length > DUPLICATE_DETECTION_LENGTH
@filter_to_agent_map.keys.each do |filter|
next unless (filter.downcase.split(SEPARATOR) - status["text"].downcase.split(SEPARATOR)).reject(&:empty?) == [] # Hacky McHackerson
@filter_to_agent_map[filter].each do |agent|
puts "(#{Time.now}) #{agent.name} received: #{status["text"]}"
AgentRunner.with_connection do
agent.process_tweet(filter, status)
end
end
end
end
end
end
end
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