Class: Pochette::Backends::BitcoinCore

Inherits:
Base
  • Object
show all
Defined in:
lib/pochette/backends/bitcoin_core.rb

Overview

A bitcoin backend that uses bitcoin-core to retrieve information. See Pochette::Backends::Trendy to learn more about the backend interface and contract.

Instance Method Summary collapse

Methods inherited from Base

#pushtx, #verify_signatures

Constructor Details

#initialize(rpc_url) ⇒ BitcoinCore

Returns a new instance of BitcoinCore.



5
6
7
 
# File 'lib/pochette/backends/bitcoin_core.rb', line 5

def initialize(rpc_url)
  @rpc_url = rpc_url
end

Instance Method Details

#balances_for(addresses, confirmations) ⇒ Object 



37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
 
# File 'lib/pochette/backends/bitcoin_core.rb', line 37

def balances_for(addresses, confirmations)
  return {} if addresses.empty?
  result = addresses.reduce({}) do |accum, address|
    accum[address] = [0,0,0,0,0,0]
    accum
  end
  
  # Populate confirmed received
  client.listreceivedbyaddress(confirmations, false, true).each do |a|
    next unless result[a[:address]]
    result[a[:address]][0] = a[:amount]
    result[a[:address]][1] = a[:amount] # Will substract UTXO from it later.
  end

  # Populate unconfirmed received
  client.listreceivedbyaddress(0, false, true).each do |a|
    next unless result[a[:address]]
    result[a[:address]][3] = a[:amount]
    result[a[:address]][4] = a[:amount] # Will substract UTXO from it later.
  end
  
  # Fix sent amounts to not include amounts which werent actually sent.
  client.listunspent(0, 99999999, addresses).each do |utxo|
    if utxo[:confirmations] >= confirmations
      result[utxo[:address]][1] -= utxo[:amount]
    end
    result[utxo[:address]][4] -= utxo[:amount]
  end
  
  # Totals are just one substraction away
  result.each do |k, v| 
    v[2] = v[0] - v[1]
    v[5] = v[3] - v[4]
  end

  result
end

#block_height ⇒ Object 



103
104
105
 
# File 'lib/pochette/backends/bitcoin_core.rb', line 103

def block_height
  client.getinfo[:blocks]
end

#client ⇒ Object 



9
10
11
 
# File 'lib/pochette/backends/bitcoin_core.rb', line 9

def client
  BitcoinRpc::Client.new(@rpc_url)
end

#incoming_for(addresses, min_date) ⇒ Object 



13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
 
# File 'lib/pochette/backends/bitcoin_core.rb', line 13

def incoming_for(addresses, min_date)
  return [] if addresses.empty?

  addresses = addresses.to_set
  block_height = client.getblockcount
  from_block = block_height - ((Time.now - min_date) / 60 / 60 * 6).ceil
  block_hash = client.getblockhash(from_block)
  
  result = []
  client.listsinceblock(block_hash, 1, true)[:transactions].each do |t|
    next if t.has_key?(:trusted) && !t[:trusted]
    next unless t[:category] == 'receive'
    next unless addresses.include?(t[:address])
    senders = []
    client.getrawtransaction(t[:txid], 1)[:vin].each do |i|
      raw_sender = client.getrawtransaction(i[:txid], 1)
      senders += raw_sender[:vout][i[:vout]][:scriptPubKey][:addresses]
    end
    result << [(t[:amount] * 1_0000_0000).to_i, t[:address], t[:txid],
      t[:confirmations], t[:vout], senders.join(',')]
  end
  result
end

#list_transactions(txids) ⇒ Object 



82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
 
# File 'lib/pochette/backends/bitcoin_core.rb', line 82

def list_transactions(txids)
  return nil if txids.empty?
  txids.collect do |txid|
    tx = client.getrawtransaction(txid, 1)
    inputs = tx[:vin].collect do |i|
      { prev_hash: i[:txid],
        prev_index: i[:vout],
        sequence: i[:sequence],
        script_sig: i[:scriptSig][:hex] 
      }
    end

    outputs = tx[:vout].collect do |o|
      { amount: (o[:value] * 1_0000_0000).to_i, script_pubkey: o[:scriptPubKey][:hex] }
    end

    { hash: tx[:txid], version: tx[:version], lock_time: tx[:locktime],
      inputs: inputs, bin_outputs: outputs}
  end
end

#list_unspent(addresses) ⇒ Object 



75
76
77
78
79
80
 
# File 'lib/pochette/backends/bitcoin_core.rb', line 75

def list_unspent(addresses)
  return nil if addresses.empty?
  client.listunspent(1, 99999999, addresses).collect do |u| 
    [u[:address], u[:txid], u[:vout], (u[:amount] * 1_0000_0000).to_i, u[:scriptPubKey]]
  end
end

#propagate(hex) ⇒ Object 



107
108
109
 
# File 'lib/pochette/backends/bitcoin_core.rb', line 107

def propagate(hex)
  client.sendrawtransaction(hex)
end