Class: Pochette::Backends::BitcoinCore

Inherits:
Object
  • 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

Constructor Details

#initialize(rpc_url) ⇒ BitcoinCore

Returns a new instance of BitcoinCore.



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# 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 



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# File 'lib/pochette/backends/bitcoin_core.rb', line 36

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 



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# File 'lib/pochette/backends/bitcoin_core.rb', line 102

def block_height
  client.getinfo[:blocks]
end

#client ⇒ Object 



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

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

#incoming_for(addresses, min_date) ⇒ Object 



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# 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 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 



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# File 'lib/pochette/backends/bitcoin_core.rb', line 81

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 



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# File 'lib/pochette/backends/bitcoin_core.rb', line 74

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

#pushtx(hex) ⇒ Object 



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# File 'lib/pochette/backends/bitcoin_core.rb', line 106

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