1#!/usr/bin/ruby
2# frozen_string_literal: true
3
4# Usage: bin/process_pending-btc_transactions '{
5# oxr_app_id = "",
6# required_confirmations = 3,
7# notify_using = {
8# jid = "",
9# password = "",
10# target = \(jid: Text) -> "+12266669977@cheogram.com",
11# body = \(jid: Text) -> \(body: Text) -> "/msg ${jid} ${body}",
12# },
13# electrum = env:ELECTRUM_CONFIG,
14# plans = ./plans.dhall,
15# activation_amount = 10000
16# }'
17
18require "bigdecimal"
19require "dhall"
20require "money/bank/open_exchange_rates_bank"
21require "net/http"
22require "nokogiri"
23require "pg"
24require "redis"
25
26require_relative "../lib/blather_notify"
27require_relative "../lib/electrum"
28require_relative "../lib/transaction"
29
30CONFIG =
31 Dhall::Coder
32 .new(safe: Dhall::Coder::JSON_LIKE + [Symbol, Proc])
33 .load(ARGV[0], transform_keys: :to_sym)
34
35REDIS = Redis.new
36ELECTRUM = Electrum.new(**CONFIG[:electrum])
37
38DB = PG.connect(dbname: "jmp")
39DB.type_map_for_results = PG::BasicTypeMapForResults.new(DB)
40DB.type_map_for_queries = PG::BasicTypeMapForQueries.new(DB)
41
42BlatherNotify.start(
43 CONFIG[:notify_using][:jid],
44 CONFIG[:notify_using][:password]
45)
46
47unless (cad_to_usd = REDIS.get("cad_to_usd")&.to_f)
48 oxr = Money::Bank::OpenExchangeRatesBank.new(Money::RatesStore::Memory.new)
49 oxr.app_id = CONFIG.fetch(:oxr_app_id)
50 oxr.update_rates
51 cad_to_usd = oxr.get_rate("CAD", "USD")
52 REDIS.set("cad_to_usd", cad_to_usd, ex: 60 * 60)
53end
54
55canadianbitcoins = Nokogiri::HTML.parse(
56 Net::HTTP.get(URI("https://www.canadianbitcoins.com"))
57)
58
59bitcoin_row = canadianbitcoins.at("#ticker > table > tbody > tr")
60raise "Bitcoin row has moved" unless bitcoin_row.at("td").text == "Bitcoin"
61
62btc_sell_price = {}
63btc_sell_price[:CAD] = BigDecimal(
64 bitcoin_row.at("td:nth-of-type(3)").text.match(/^\$(\d+\.\d+)/)[1]
65)
66btc_sell_price[:USD] = btc_sell_price[:CAD] * cad_to_usd
67
68class Plan
69 def self.for_customer(customer)
70 row = DB.exec_params(<<-SQL, [customer.id]).first
71 SELECT customer_plans.plan_name, UPPER(date_range) - LOWER(date_range) < '2 seconds' AS pd
72 FROM customer_plans LEFT JOIN plan_log
73 ON customer_plans.customer_id = plan_log.customer_id
74 AND plan_log.date_range -|- tsrange(expires_at, expires_at, '[]')
75 WHERE customer_plans.customer_id=$1 LIMIT 1
76 SQL
77 return nil unless row
78
79 from_name(customer, row["plan_name"], klass: row["pd"] ? Pending : Plan)
80 end
81
82 def self.from_name(customer, plan_name, klass: Plan)
83 return unless plan_name
84
85 plan = CONFIG[:plans].find { |p| p[:name] == plan_name }
86 klass.new(customer, plan) if plan
87 end
88
89 def initialize(customer, plan)
90 @customer = customer
91 @plan = plan
92 end
93
94 def name
95 @plan[:name]
96 end
97
98 def currency
99 @plan[:currency]
100 end
101
102 def price
103 BigDecimal(@plan[:monthly_price].to_i) * 0.0001
104 end
105
106 def notify_any_pending_plan!; end
107
108 class Pending < Plan
109 def initialize(customer, plan)
110 super
111 @go_until = Date.today >> 1
112 end
113
114 def activation_amount
115 camnt = BigDecimal(CONFIG[:activation_amount].to_i) * 0.0001
116 [camnt, price].max
117 end
118
119 def notify_any_pending_plan!
120 if @customer.balance < activation_amount
121 @customer.notify(
122 "Your account could not be activated because your " \
123 "balance of $#{@customer.balance} is less that the " \
124 "required activation amount of $#{activation_amount}. " \
125 "Please buy more credit to have your account activated."
126 )
127 else
128 notify_approved
129 end
130 end
131
132 protected
133
134 def notify_approved
135 @customer.notify(
136 "Your JMP account has been approved. To complete " \
137 "your signup, click/tap this link: xmpp:cheogram.com " \
138 "and send register jmp.chat to the bot.",
139 "Your JMP account has been approved. To complete " \
140 "your signup, click/tap this link: " \
141 "xmpp:cheogram.com/CHEOGRAM%25jabber%3Aiq%3Aregister" \
142 "?command;node=jabber%3Aiq%3Aregister"
143 )
144 end
145 end
146end
147
148class Customer
149 def initialize(customer_id)
150 @customer_id = customer_id
151 end
152
153 def id
154 @customer_id
155 end
156
157 def notify(body, onboarding_body=nil)
158 jid = REDIS.get("jmp_customer_jid-#{@customer_id}")
159 raise "No JID for #{customer_id}" unless jid
160
161 if jid =~ /onboarding.cheogram.com/ && onboarding_body
162 body = onboarding_body
163 end
164
165 BlatherNotify.say(
166 CONFIG[:notify_using][:target].call(jid),
167 CONFIG[:notify_using][:body].call(jid, body)
168 )
169 end
170
171 def plan
172 Plan.for_customer(self)
173 end
174
175 def balance
176 result = DB.exec_params(<<-SQL, [@customer_id]).first&.[]("balance")
177 SELECT balance FROM balances WHERE customer_id=$1
178 SQL
179 result || BigDecimal(0)
180 end
181
182 def add_btc_credit(txid, btc_amount, fiat_amount)
183 tx = Transaction.new(@customer_id, txid, fiat_amount, "Bitcoin payment")
184 return unless tx.save
185
186 tx.bonus&.save
187 notify_btc_credit(txid, btc_amount, fiat_amount, tx.bonus_amount)
188 end
189
190 def notify_btc_credit(txid, btc_amount, fiat_amount, bonus)
191 tx_hash, = txid.split("/", 2)
192 notify([
193 "Your Bitcoin transaction of #{btc_amount.to_s('F')} BTC ",
194 "has been added as $#{'%.4f' % fiat_amount} (#{plan.currency}) ",
195 ("+ $#{'%.4f' % bonus} bonus " if bonus.positive?),
196 "to your account.\n(txhash: #{tx_hash})"
197 ].compact.join)
198 end
199end
200
201done = REDIS.hgetall("pending_btc_transactions").map { |(txid, customer_id)|
202 tx_hash, address = txid.split("/", 2)
203 transaction = ELECTRUM.gettransaction(tx_hash)
204 next unless transaction.confirmations >= CONFIG[:required_confirmations]
205
206 btc = transaction.amount_for(address)
207 if btc <= 0
208 # This is a send, not a receive, do not record it
209 REDIS.hdel("pending_btc_transactions", txid)
210 next
211 end
212 DB.transaction do
213 customer = Customer.new(customer_id)
214 if (plan = customer.plan)
215 amount = btc * btc_sell_price.fetch(plan.currency).round(4, :floor)
216 customer.add_btc_credit(txid, btc, amount)
217 plan.notify_any_pending_plan!
218 REDIS.hdel("pending_btc_transactions", txid)
219 txid
220 else
221 warn "No plan for #{customer_id} cannot save #{txid}"
222 end
223 end
224}
225
226puts done.compact.join("\n")