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require "json"
require_relative "oauth"
class ServiceError < StandardError; end
class Service
class << self
private :new
def setup
consumer_key = ENV["TWITTER_EVENT_STREAM_CONSUMER_KEY"]
consumer_secret = ENV["TWITTER_EVENT_STREAM_CONSUMER_SECRET"]
user_objs = []
ENV.each { |k, v|
next unless k.start_with?("TWITTER_EVENT_STREAM_USER_")
user_objs << JSON.parse(v, symbolize_names: true)
}
# We assume the webapp is already started at this point: the CRC requires
# GET /webhook to respond
app_url = ENV["TWITTER_EVENT_STREAM_BASE_URL"]
aa_env_name = ENV["TWITTER_EVENT_STREAM_ENV_NAME"]
setup_webhook(app_url, aa_env_name, consumer_key, consumer_secret,
user_objs)
@users = {}
user_objs.each { |obj|
@users[obj.fetch(:user_id)] = new(
user_id: obj.fetch(:user_id),
requests_per_window: obj.fetch(:requests_per_window),
rest_oauth: {
consumer_key: obj.fetch(:rest_consumer_key) {
consumer_key },
consumer_secret: obj.fetch(:rest_consumer_secret) {
consumer_secret },
token: obj.fetch(:rest_token) {
obj.fetch(:token) },
token_secret: obj.fetch(:rest_token_secret) {
obj.fetch(:token_secret) }
},
)
}
end
private def setup_webhook(app_url, env_name, consumer_key, consumer_secret,
user_objs)
oauth = proc { |n|
{
consumer_key: consumer_key,
consumer_secret: consumer_secret,
token: user_objs.dig(n, :token),
token_secret: user_objs.dig(n, :token_secret),
}
}
if user_objs.empty?
warn "setup_webhook: no users configured. cannot setup webhook"
return
end
warn "setup_webhook: get existing webhook URL(s)"
app_token = OAuthHelpers.bearer_request_token(oauth[0])
body = OAuthHelpers.bearer_get(app_token,
"/1.1/account_activity/all/webhooks.json")
obj = JSON.parse(body, symbolize_names: true)
env = obj.dig(:environments).find { |v| v[:environment_name] == env_name }
warn "setup_webhook: clear existing webhook URL(s)"
env[:webhooks].each do |webhook|
warn "setup_webhook: delete id=#{webhook[:id]}: #{webhook[:url]}"
path = "/1.1/account_activity/all/#{env_name}/webhooks/" \
"#{webhook[:id]}.json"
OAuthHelpers.user_delete(oauth[0], path)
end
warn "setup_webhook: register a webhook URL"
webhook_url = app_url + (app_url.end_with?("/") ? "" : "/") + "webhook"
path = "/1.1/account_activity/all/#{env_name}/webhooks.json?url=" +
CGI.escape(webhook_url)
webhook = OAuthHelpers.user_post(oauth[0], path)
warn "setup_webhook: => #{webhook}"
warn "setup_webhook: add subscriptions"
user_objs.each_with_index { |_, n|
warn "setup_webhook: add subscription for " \
"user_id=#{user_objs.dig(n, :user_id)}"
path = "/1.1/account_activity/all/#{env_name}/subscriptions.json"
OAuthHelpers.user_post(oauth[n], path)
}
rescue => e
warn "setup_webhook: uncaught exception: #{e.class} (#{e.message})"
warn e.backtrace
end
def oauth_echo(asp, vca)
if asp != "https://api.twitter.com/1.1/account/verify_credentials.json"
raise ServiceError, "invalid OAuth Echo parameters"
end
begin
body = OAuthHelpers.http_get(vca, asp)
content = JSON.parse(body, symbolize_names: true)
get(content[:id])
rescue OAuthHelpers::HTTPRequestError
raise ServiceError, "OAuth Echo failed"
end
end
def feed_webhook(json)
hash = JSON.parse(json)
if user_id = hash["for_user_id"]
service = get(Integer(user_id))
service.feed_webhook(hash)
else
warn "FIXME\n#{hash}"
end
end
private
def get(user_id)
defined?(@users) and @users[user_id] or
raise ServiceError, "unauthenticated user: #{user_id}"
end
end
attr_reader :user_id
def initialize(user_id:,
requests_per_window:,
rest_oauth:)
@user_id = user_id
@requests_per_window = Integer(requests_per_window)
@rest_oauth = rest_oauth
@listeners = {}
@backfill = []
start_polling
end
def subscribe(count, &block)
@listeners[block] = block
emit_backfill(count)
block
end
def unsubscribe(tag)
@listeners.delete(tag)
end
def feed_webhook(hash)
hash.each do |key, value|
next if key == "for_user_id"
emit(key, value)
end
end
def twitter_get(path, params)
JSON.parse(OAuthHelpers.user_get(@rest_oauth, path, params))
rescue OAuthHelpers::HTTPRequestError => e
# pp e.res.each_header.to_h
raise ServiceError, "API request failed: path=#{path} body=#{e.res.body}"
end
private
def emit(event, object)
# TODO: backfill
@backfill.shift if @backfill.size == 100
@backfill << [event, object]
@listeners.each { |_, block| block.call(event, object) }
end
def emit_system(message)
emit("twitter_event_stream_message", message)
end
def emit_backfill(count)
@backfill.last(count).each { |event, object| emit(event, object) }
end
def start_polling
@polling_thread = Thread.start {
request_interval = 15.0 * 60 / @requests_per_window
begin
last_max = nil
while true
t = Time.now
opts = { "count" => 200, "since_id" => last_max ? last_max - 1 : 1 }
ret = twitter_get("/1.1/statuses/home_timeline.json", opts)
unless ret.empty?
if last_max
if last_max != ret.last["id"]
emit_system("possible stalled tweets " \
"#{last_max}+1...#{ret.last["id"]}")
else
ret.pop
end
end
unless ret.empty?
emit("twitter_event_stream_home_timeline", ret)
last_max = ret.first["id"]
end
end
sleep -(Time.now - t) % request_interval
end
rescue => e
warn "polling_thread (#{user_id}) uncaught exception: " \
"#{e.class} (#{e.message})"
warn e.backtrace
warn "polling_thread (#{user_id}) restarting in #{request_interval}s"
sleep request_interval
retry
end
}
end
end
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