1#!/usr/bin/env ruby
2#
3# Copyright (C) 2020 Denver Gingerich <denver@ossguy.com>
4#
5# This file is part of sgx-bwmsgsv2.
6#
7# sgx-bwmsgsv2 is free software: you can redistribute it and/or modify it under
8# the terms of the GNU Affero General Public License as published by the Free
9# Software Foundation, either version 3 of the License, or (at your option) any
10# later version.
11#
12# sgx-bwmsgsv2 is distributed in the hope that it will be useful, but WITHOUT
13# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
14# FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
15# details.
16#
17# You should have received a copy of the GNU Affero General Public License along
18# with sgx-bwmsgsv2. If not, see <http://www.gnu.org/licenses/>.
19
20require 'redis'
21require 'hiredis'
22require 'net/http'
23require 'time'
24
25$stdout.sync = true
26
27puts "Redis queue to SGX HTTP request translator - for Bandwidth API V2 SGX\n"\
28 "==>> last commit of this version is " + `git rev-parse HEAD` + "\n"
29
30if ARGV.size != 3
31 # note that <redis_queue_suffix> should match h2r-bwmsgsv2's $queue_name
32 puts "Usage: r2s-bwmsgsv2.rb <redis_queue_suffix> <sgx_hostname> "\
33 "<sgx_https_port>"
34 exit 0
35end
36
37["INT", "TERM"].each do |sig|
38 trap(sig) do
39 puts "Translator has terminated due to SIG#{sig}."
40 exit 0
41 end
42end
43
44t = Time.now
45puts "LOG %d.%09d: starting...\n\n" % [t.to_i, t.nsec]
46
47redis = Redis.new(:driver => :hiredis)
48
49pending_len = redis.llen('pending_messages-' + ARGV[0])
50if pending_len != 0
51 puts 'Translator terminated due to non-empty pending queue of size ' +
52 pending_len.to_s
53 exit 1
54end
55
56while true
57 timestamps_plus_json_blob = redis.brpoplpush('incoming_messages-' +
58 ARGV[0], 'pending_messages-' + ARGV[0])
59
60 t = Time.now
61 ts = "%d.%09d" % [t.to_i, t.nsec]
62 tai_timestamp = `./tai`.strip
63 tai_yyyymmdd = Time.at(tai_timestamp.to_i).strftime('%Y%m%d')
64 puts "LOG %s, %s: handling message sent on %s ...\n" %
65 [ts, tai_timestamp, tai_yyyymmdd]
66
67 # WARNING: since not atomic with setex() below, translator is singleton
68 day_msg_count = redis.incr(
69 "archived_message-#{ARGV[0]}-#{tai_yyyymmdd}-total"
70 )
71 # TODO: confirm day_msg_count is integer > 0 (otherwise likely an error)
72 # unsure how to best error here: bail would cause infinite bounce; eml?
73
74 t = Time.now
75 puts "LOG %d.%09d: total msgs for %s-%s now at %s\n" %
76 [t.to_i, t.nsec, tai_yyyymmdd, ARGV[0], day_msg_count]
77
78 # TODO: print less stuff in here
79 puts "TODO - got some stuff: " + timestamps_plus_json_blob
80 puts "TODO - daymsgcount: '#{day_msg_count}'"
81
82 t2 = Time.now
83 ts2 = "%d.%09d" % [t2.to_i, t2.nsec]
84 tai_timestamp2 = `./tai`.strip
85
86 new_json_blob =
87 '"ts_040_tai-translator_pre_send":' + tai_timestamp2 +
88 ',"ts_040_unix-translator_pre_send":' + ts2 +
89 ',"ts_030_tai-translator_received":' + tai_timestamp +
90 ',"ts_030_unix-translator_received":' + ts +
91 ',' + timestamps_plus_json_blob
92
93 uri = URI("http://#{ARGV[1]}:#{ARGV[2]}/")
94 req = Net::HTTP::Post.new(uri, 'Content-Type' => 'application/json')
95 req.body = new_json_blob.split('G', 2)[1][2..-1] # only use MSG part
96 begin
97 res = Net::HTTP.start(uri.hostname, uri.port) do |http|
98 http.request(req)
99 end
100 # list of exceptions is from https://stackoverflow.com/a/5370726
101 rescue Timeout::Error, Errno::EINVAL, Errno::ECONNRESET, EOFError,
102 Net::HTTPBadResponse, Net::HTTPHeaderSyntaxError,
103 Net::ProtocolError => e
104
105 puts "TODO problem '#{e}' - now we should try again..."
106 # TODO: actually try again
107 else
108 puts "TODO - res: '#{res.code}' '#{res.message}': '#{res.body}'"
109 end
110
111 # TODO: add following functionality:
112 # if SGX gives back anything but response.code 200, retry 5 times-ish
113 # if SGX failed to respond after retries, email or other notify
114 # and back off with even longer retries (can't do anything else really)
115
116 exists = redis.exists(
117 "archived_message-#{ARGV[0]}-#{tai_yyyymmdd}-#{day_msg_count}"
118 )
119 if exists
120 puts 'Translator terminated since archive message at index ' +
121 day_msg_count.to_s + ' for day ' + tai_yyyymmdd.to_s +
122 " unexpectedly exists already, with retval '#{exists}'"
123 exit 2
124 end
125
126 # WARNING: since not atomic with incr() above, translator is singleton
127 rv1 = redis.setex(
128 "archived_message-#{ARGV[0]}-#{tai_yyyymmdd}-#{day_msg_count}",
129 259200, new_json_blob
130 )
131 if rv1 != 'OK'
132 puts 'Translator terminated since archive message at index ' +
133 day_msg_count.to_s + ' for day ' + tai_yyyymmdd.to_s +
134 " could not be saved, with return value '#{rv1}'"
135 exit 3
136 end
137
138 pending_len = redis.llen('pending_messages-' + ARGV[0])
139 if pending_len != 1
140 puts 'Translator terminated since pending queue (at index ' +
141 day_msg_count.to_s + ' for day ' + tai_yyyymmdd.to_s +
142 ') has unexpected non-1 length of ' + pending_len.to_s
143 exit 4
144 end
145
146 pending_item = redis.rpop('pending_messages-' + ARGV[0])
147 if timestamps_plus_json_blob != pending_item
148 puts 'Translator terminated since archived item (at index ' +
149 day_msg_count.to_s + ' for day ' + tai_yyyymmdd.to_s +
150 ") does not match pending item '#{pending_item}'"
151 exit 5
152 end
153end