Class: Bitcoin::Network::Node

Inherits:
Object
  • Object
show all
Defined in:
lib/bitcoin/network/node.rb

Constant Summary collapse

DEFAULT_CONFIG = 
{
  :network => :bitcoin,
  :listen => ["0.0.0.0", Bitcoin.network[:default_port]],
  :connect => [],
  :command => ["127.0.0.1", 9999],
  :storage => "utxo::sqlite://~/.bitcoin-ruby/<network>/blocks.db",
  :mode => :full,
  :dns => true,
  :epoll_limit => 10000,
  :epoll_user => nil,
  :addr_file => "~/.bitcoin-ruby/<network>/peers.json",
  :log => {
    :network => :info,
    :storage => :info,
  },
  :max => {
    :connections_out => 8,
    :connections_in => 32,
    :connections => 8,
    :addr => 256,
    :queue => 501,
    :inv => 501,
    :inv_cache => 0,
    :unconfirmed => 100,
  },
  :intervals => {
    :queue => 1,
    :inv_queue => 1,
    :addrs => 5,
    :connect => 5,
    :relay => 0,
  },
  :import => nil,
  :skip_validation => false,
  :check_blocks => 1000,
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config = {}) ⇒ Node

Returns a new instance of Node.



88
89
90
91
92
93
94
95
96
97
98
99
100
 
# File 'lib/bitcoin/network/node.rb', line 88

def initialize config = {}
  @config = DEFAULT_CONFIG.deep_merge(config)
  @log = Bitcoin::Logger.create(:network, @config[:log][:network])
  @connections, @command_connections = [], []
  @queue, @queue_thread, @inv_queue, @inv_queue_thread = [], nil, [], nil
  set_store
  load_addrs
  @timers = {}
  @inv_cache = []
  @notifiers = {}
  @relay_propagation, @last_block_time, @external_ips = {}, Time.now, []
  @unconfirmed, @relay_tx = {}, {}
end

Instance Attribute Details

#addrs ⇒ Object (readonly)

peer addrs (Array of Bitcoin::Protocol::Addr)



36
37
38
 
# File 'lib/bitcoin/network/node.rb', line 36

def addrs
  @addrs
end

#command_connections ⇒ Object (readonly)

command connections (Array of CommandHandler)



21
22
23
 
# File 'lib/bitcoin/network/node.rb', line 21

def command_connections
  @command_connections
end

#config ⇒ Object (readonly)

configuration hash



12
13
14
 
# File 'lib/bitcoin/network/node.rb', line 12

def config
  @config
end

#connections ⇒ Object (readonly)

connections to other peers (Array of ConnectionHandler)



18
19
20
 
# File 'lib/bitcoin/network/node.rb', line 18

def connections
  @connections
end

#external_ips ⇒ Object

our external ip addresses we got told by peers



42
43
44
 
# File 'lib/bitcoin/network/node.rb', line 42

def external_ips
  @external_ips
end

#inv_cache ⇒ Object (readonly)

inventory cache (blocks/tx recently downloaded)



30
31
32
 
# File 'lib/bitcoin/network/node.rb', line 30

def inv_cache
  @inv_cache
end

#inv_queue ⇒ Object (readonly)

inventory queue (blocks/tx waiting to be downloaded)



27
28
29
 
# File 'lib/bitcoin/network/node.rb', line 27

def inv_queue
  @inv_queue
end

#last_block_time ⇒ Object (readonly)

time when the last main chain block was added



45
46
47
 
# File 'lib/bitcoin/network/node.rb', line 45

def last_block_time
  @last_block_time
end

#log ⇒ Object (readonly)

logger



15
16
17
 
# File 'lib/bitcoin/network/node.rb', line 15

def log
  @log
end

#notifiers ⇒ Object (readonly)

clients to be notified for new block/tx events



39
40
41
 
# File 'lib/bitcoin/network/node.rb', line 39

def notifiers
  @notifiers
end

#queue ⇒ Object (readonly)

storage queue (blocks/tx waiting to be stored)



24
25
26
 
# File 'lib/bitcoin/network/node.rb', line 24

def queue
  @queue
end

#relay_propagation ⇒ Object

Returns the value of attribute relay_propagation.



48
49
50
 
# File 'lib/bitcoin/network/node.rb', line 48

def relay_propagation
  @relay_propagation
end

#relay_tx ⇒ Object

Returns the value of attribute relay_tx.



47
48
49
 
# File 'lib/bitcoin/network/node.rb', line 47

def relay_tx
  @relay_tx
end

#store ⇒ Object (readonly)

Bitcoin::Storage backend



33
34
35
 
# File 'lib/bitcoin/network/node.rb', line 33

def store
  @store
end

Instance Method Details

#accept_connections? ⇒ Boolean

should the node accept new incoming connections?

Returns:

  • (Boolean) 


473
474
475
 
# File 'lib/bitcoin/network/node.rb', line 473

def accept_connections?
  connections.select(&:incoming?).size >= config[:max][:connections_in]
end

#connect_dns ⇒ Object

query addrs from dns seed and connect



268
269
270
271
272
273
274
275
276
277
278
279
 
# File 'lib/bitcoin/network/node.rb', line 268

def connect_dns
  unless Bitcoin.network[:dns_seeds].any?
    log.warn { "No DNS seed nodes available" }
    return connect_known_peers
  end
  connect_dns_resolver(Bitcoin.network[:dns_seeds].sample) do |addrs|
    log.debug { "DNS returned addrs: #{addrs.inspect}" }
    addrs.sample(@config[:max][:connections_out] / 2).uniq.each do |addr|
      connect_peer(addr, Bitcoin.network[:default_port])
    end
  end
end

#connect_dns_nslookup(seed) {|addrs| ... } ⇒ Object

get peers from dns via nslookup

Yields:



307
308
309
310
311
312
 
# File 'lib/bitcoin/network/node.rb', line 307

def connect_dns_nslookup(seed)
  log.info { "Querying addresses from DNS seed: #{seed}" }
  addrs = `nslookup #{seed}`.scan(/Address\: (.+)$/).flatten
  #  exit  if @config[:dns] && hosts.size == 0
  yield(addrs)
end

#connect_dns_resolver(seed) ⇒ Object

get peer addrs from given dns seed using em/dns_resolver. fallback to using ‘nslookup` if it is not installed or fails.



290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
 
# File 'lib/bitcoin/network/node.rb', line 290

def connect_dns_resolver(seed)
  if Bitcoin.require_dependency "em/dns_resolver", gem: "em-dns", exit: false
    log.info { "Querying addresses from DNS seed: #{seed}" }

    dns = EM::DnsResolver.resolve(seed)
    dns.callback {|addrs| yield(addrs) }
    dns.errback do |*a|
      log.error { "Cannot resolve DNS seed #{seed}: #{a.inspect}" }
      connect_dns_nslookup(Bitcoin.network[:dns_seeds].sample) {|a| yield(a) }
    end
  else
    log.info { "Falling back to nslookup resolver." }
    connect_dns_nslookup(seed) {|a| yield(a) }
  end
end

#connect_known_peers ⇒ Object 



281
282
283
284
285
286
 
# File 'lib/bitcoin/network/node.rb', line 281

def connect_known_peers
  log.debug { "Attempting to connecting to known nodes" }
  Bitcoin.network[:known_nodes].shuffle[0..3].each do |node|
    connect_peer node, Bitcoin.network[:default_port]
  end
end

#connect_peer(host, port) ⇒ Object

connect to peer at given host / port



258
259
260
261
262
263
264
265
 
# File 'lib/bitcoin/network/node.rb', line 258

def connect_peer host, port
  return  if @connections.map{|c| c.host }.include?(host)
  log.debug { "Attempting to connect to #{host}:#{port}" }
  EM.connect(host, port.to_i, ConnectionHandler, self, host, port.to_i, :out)
rescue
  log.debug { "Error connecting to #{host}:#{port}" }
  log.debug { $!.inspect }
end

#epoll_init ⇒ Object

initiate epoll with given file descriptor and set effective user



186
187
188
189
190
191
192
193
194
 
# File 'lib/bitcoin/network/node.rb', line 186

def epoll_init
  log.info { "EPOLL: Available file descriptors: " +
    EM.set_descriptor_table_size(@config[:epoll_limit]).to_s }
  if @config[:epoll_user]
    EM.set_effective_user(@config[:epoll_user])
    log.info { "EPOLL: Effective user set to: #{@config[:epoll_user]}" }
  end
  EM.epoll = true
end

#external_ip ⇒ Object

get the external ip that was suggested in version messages from other peers most often.



453
454
455
456
457
 
# File 'lib/bitcoin/network/node.rb', line 453

def external_ip
  @external_ips.group_by(&:dup).values.max_by(&:size).first
rescue
  @config[:listen][0]
end

#getblocks(locator = store.get_locator) ⇒ Object

query blocks from random peer



335
336
337
338
339
340
341
342
343
344
345
 
# File 'lib/bitcoin/network/node.rb', line 335

def getblocks locator = store.get_locator
  peer = @connections.select(&:connected?).sample
  return  unless peer
  log.info { "querying blocks from #{peer.host}:#{peer.port}" }
  case @config[:mode]
  when /lite/
    peer.send_getheaders locator  unless @queue.size >= @config[:max][:queue]
  when /full|pruned/
    peer.send_getblocks locator  unless @inv_queue.size >= @config[:max][:inv]
  end
end

#load_addrs ⇒ Object 



127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
 
# File 'lib/bitcoin/network/node.rb', line 127

def load_addrs
  file = @config[:addr_file].sub("~", ENV["HOME"])
    .sub("<network>", Bitcoin.network_name.to_s)
  unless File.exist?(file)
    @addrs = []
    FileUtils.mkdir_p(File.dirname(file))
    return
  end
  @addrs = JSON.load(File.read(file)).map do |a|
    addr = Bitcoin::P::Addr.new
    addr.time, addr.service, addr.ip, addr.port =
      a['time'], a['service'], a['ip'], a['port']
    addr
  end
  log.info { "Initialized #{@addrs.size} addrs from #{file}." }
rescue
  @addrs = []
  log.warn { "Error loading addrs from #{file}." }
end

#push_notification(channel, message) ⇒ Object

push notification message to channel



460
461
462
 
# File 'lib/bitcoin/network/node.rb', line 460

def push_notification channel, message
  @notifiers[channel.to_sym].push(message)  if @notifiers[channel.to_sym]
end

#queue_inv(inv) ⇒ Object

queue inv, caching the most current ones



430
431
432
433
434
435
436
437
438
439
440
441
442
 
# File 'lib/bitcoin/network/node.rb', line 430

def queue_inv inv
  hash = inv[1].unpack("H*")[0]
  return  if @inv_queue.include?(inv) || @queue.select {|i| i[1].hash == hash }.any?

  return  if @store.send("has_#{inv[0]}", hash)

#      @inv_cache.shift(128)  if @inv_cache.size > @config[:max][:inv_cache]
#      return  if @inv_cache.include?([inv[0], inv[1]]) ||
#        @inv_queue.size >= @config[:max][:inv] ||
#        ([email protected]_sync? && inv[0] == :tx)
#      @inv_cache << [inv[0], inv[1]]
  @inv_queue << inv
end

#run ⇒ Object 



196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
 
# File 'lib/bitcoin/network/node.rb', line 196

def run
  @started = Time.now

  EM.add_shutdown_hook do
    store_addrs
    log.info { "Bye" }
  end

  # enable kqueue (BSD, OS X)
  if EM.kqueue?
    log.info { 'Using BSD kqueue' }
    EM.kqueue = true
  end

  # enable epoll (Linux)
  if EM.epoll?
    log.info { 'Using Linux epoll' }
    epoll_init
  end

  EM.run do

    start_timers

    host, port = *@config[:command]
    port ||= Bitcoin.network[:default_port]
    if host
      log.debug { "Trying to bind command socket to #{host}:#{port}" }
      EM.start_server(host, port, CommandHandler, self)
      log.info { "Command socket listening on #{host}:#{port}" }
    end

    host, port = *@config[:listen]
    port ||= Bitcoin.network[:default_port]
    if host
      log.debug { "Trying to bind server socket to #{host}:#{port}" }
      EM.start_server(host, port.to_i, ConnectionHandler, self, host, port.to_i, :in)
      log.info { "Server socket listening on #{host}:#{port}" }
    end

    @config[:connect].each do |host, port|
      port ||= Bitcoin.network[:default_port]
      connect_peer(host, port)
      log.info { "Connecting to #{host}:#{port}" }
    end

    work_connect if @addrs.any?
    connect_dns  if @config[:dns]

    Signal.trap("INT") do
      puts "Shutting down. You can force-quit by pressing Ctrl-C again, but it might corrupt your database!"
      Signal.trap("INT") do
        puts "Force Quit"
        exit 1
      end
      self.stop
    end

  end
end

#set_store ⇒ Object 



102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
 
# File 'lib/bitcoin/network/node.rb', line 102

def set_store
  backend, config = @config[:storage].split('::')
  @store = Bitcoin::Storage.send(backend, {
      db: config, mode: @config[:mode], cache_head: true,
      skip_validation: @config[:skip_validation],
      log_level: @config[:log][:storage]}, ->(locator) {
      peer = @connections.select(&:connected?).sample
      peer.send_getblocks(locator)
    })
  @store.log.level = @config[:log][:storage]
  @store.check_consistency(@config[:check_blocks])
  if @config[:import]
    @importing = true
    EM.defer do
      begin
        @store.import(@config[:import]); @importing = false
      rescue
        log.fatal { $!.message }
        puts *$@
        stop
      end
    end
  end
end

#start_timers ⇒ Object 



172
173
174
175
176
177
178
179
 
# File 'lib/bitcoin/network/node.rb', line 172

def start_timers
  return EM.add_timer(1) { start_timers }  if @importing
  [:queue, :inv_queue, :addrs, :connect, :relay].each do |name|
    interval = @config[:intervals][name].to_f
    next  if !interval || interval == 0.0
    @timers[name] = EM.add_periodic_timer(interval, method("work_#{name}"))
  end
end

#stop ⇒ Object 



162
163
164
165
166
 
# File 'lib/bitcoin/network/node.rb', line 162

def stop
  puts "Shutting down..."
  stop_timers
  EM.stop
end

#stop_timers ⇒ Object 



181
182
183
 
# File 'lib/bitcoin/network/node.rb', line 181

def stop_timers
  @timers.each {|n, t| EM.cancel_timer t }
end

#store_addrs ⇒ Object 



147
148
149
150
151
152
153
154
155
156
157
158
159
160
 
# File 'lib/bitcoin/network/node.rb', line 147

def store_addrs
  return  if !@addrs || !@addrs.any?
  file = @config[:addr_file].sub("~", ENV["HOME"])
    .sub("<network>", Bitcoin.network_name.to_s)
  FileUtils.mkdir_p(File.dirname(file))
  File.open(file, 'w') do |f|
    addrs = @addrs.map {|a|
      Hash[[:time, :service, :ip, :port].zip(a.entries)] rescue nil }.compact
    f.write(JSON.pretty_generate(addrs))
  end
  log.info { "Stored #{@addrs.size} addrs to #{file}." }
rescue
  log.warn { "Error storing addrs to #{file}." }
end

#subscribe(channel) ⇒ Object

subscribe to notification channel. available channels are: block, tx, output, connection. see CommandHandler for details.



467
468
469
470
 
# File 'lib/bitcoin/network/node.rb', line 467

def subscribe channel
  @notifiers[channel.to_sym] ||= EM::Channel.new
  @notifiers[channel.to_sym].subscribe {|*data| yield(*data) }
end

#uptime ⇒ Object 



168
169
170
 
# File 'lib/bitcoin/network/node.rb', line 168

def uptime
  (Time.now - @started).to_i
end

#work_addrs ⇒ Object

check if the addr store is full and request new addrs from a random peer if it isn’t



349
350
351
352
353
354
355
356
357
 
# File 'lib/bitcoin/network/node.rb', line 349

def work_addrs
  log.debug { "addr worker running" }
  @addrs.delete_if{|addr| !addr.alive? }  if @addrs.size >= @config[:max][:addr]
  return  if !@connections.any? || @config[:max][:connections] <= @connections.size
  connections = @connections.select(&:connected?)
  return  unless connections.any?
  log.info { "requesting addrs" }
  connections.sample.send_getaddr
end

#work_connect ⇒ Object

check if there are enough connections and try to establish new ones if needed



316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
 
# File 'lib/bitcoin/network/node.rb', line 316

def work_connect
  log.debug { "Connect worker running" }
  desired = @config[:max][:connections_out] - @connections.select(&:outgoing?).size
  return  if desired <= 0
  desired = 32  if desired > 32 # connect to max 32 peers at once
  if addrs.any?
    addrs.sample(desired) do |addr|
      Time.now.tv_sec + 10800 - addr.time
    end.each do |addr|
      connect_peer(addr.ip, addr.port)
    end
  elsif @config[:dns]
    connect_dns
  end
rescue
  log.error { "Error during connect: #{$!.inspect}" }
end

#work_inv_queue ⇒ Object

check for new items in the inv queue and process them, unless the queue is already full



418
419
420
421
422
423
424
425
426
427
 
# File 'lib/bitcoin/network/node.rb', line 418

def work_inv_queue
  @log.debug { "inv queue worker running" }
  return  if @inv_queue.size == 0
  return  if @queue.size >= @config[:max][:queue]
  while inv = @inv_queue.shift
    next  if !@store.in_sync? && inv[0] == :tx && @notifiers.empty?
    next  if @queue.map{|i|i[1]}.map(&:hash).include?(inv[1])
    inv[2].send("send_getdata_#{inv[0]}", inv[1])
  end
end

#work_queue ⇒ Object

check for new items in the queue and process them



360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
 
# File 'lib/bitcoin/network/node.rb', line 360

def work_queue
  @log.debug { "queue worker running" }
  return getblocks  if @queue.size == 0

  # switch off utxo cache once there aren't tons of new blocks coming in
  if @store.in_sync?
    if @store.is_a?(Bitcoin::Storage::Backends::UtxoStore) && @store.config[:utxo_cache] > 0
      log.debug { "switching off utxo cache" }
      @store.config[:utxo_cache] = 0
    end
    @config[:intervals].each do |name, value|
      if value <= 1
        log.debug { "setting #{name} interval to 5 seconds" }
        @config[:intervals][name] = 5
      end
    end
  end

  while obj = @queue.shift
    begin
      if obj[0].to_sym == :block
        if res = @store.send("new_#{obj[0]}", obj[1])
          if res[1] == 0  && obj[1].hash == @store.get_head.hash
            @last_block_time = Time.now
            push_notification(:block, [obj[1], res[0]])
            obj[1].tx.each {|tx| @unconfirmed.delete(tx.hash) }
          end
          getblocks  if res[1] == 2 && @store.in_sync?
        end
      else
        drop = @unconfirmed.size - @config[:max][:unconfirmed] + 1
        drop.times { @unconfirmed.shift }  if drop > 0
        unless @unconfirmed[obj[1].hash]
          @unconfirmed[obj[1].hash] = obj[1]
          push_notification(:tx, [obj[1], 0])

          if @notifiers[:output]
            obj[1].out.each do |out|
              address = Bitcoin::Script.new(out.pk_script).get_address
              push_notification(:output, [obj[1].hash, address, out.value, 0])
            end
          end
        end
      end
    rescue Bitcoin::Validation::ValidationError
      @log.warn { "ValidationError storing #{obj[0]} #{obj[1].hash}: #{$!.message}" }
      # File.open("./validation_error_#{obj[0]}_#{obj[1].hash}.bin", "w") {|f|
      #   f.write(obj[1].to_payload) }
      # EM.stop
    rescue
      @log.warn { $!.inspect }
      puts *$@
    end
  end
end

#work_relay ⇒ Object 



444
445
446
447
448
449
 
# File 'lib/bitcoin/network/node.rb', line 444

def work_relay
  log.debug { "relay worker running" }
  @store.get_unconfirmed_tx.each do |tx|
    relay_tx(tx)
  end
end