Class: Sibit::Blockchain

Inherits:
Object
  • Object
show all
Defined in:
lib/sibit/blockchain.rb

Overview

Blockchain.info API.

Instance Method Summary collapse

Constructor Details

#initialize(log: Sibit::Log.new, http: Sibit::Http.new, dry: false) ⇒ Blockchain

Constructor.



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# File 'lib/sibit/blockchain.rb', line 43

def initialize(log: Sibit::Log.new, http: Sibit::Http.new, dry: false)
  @http = http
  @log = log
  @dry = dry
end

Instance Method Details

#balance(address) ⇒ Object

Gets the balance of the address, in satoshi.



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# File 'lib/sibit/blockchain.rb', line 76

def balance(address)
  json = Sibit::Json.new(http: @http, log: @log).get(
    URI("https://blockchain.info/rawaddr/#{address}?limit=0"),
    accept: [200, 500]
  )
  b = json['final_balance']
  @log.info("The balance of #{address} is #{b} satoshi (#{json['n_tx']} txns)")
  b
end

#block(hash) ⇒ Object

This method should fetch a Blockchain block and return as a hash.



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# File 'lib/sibit/blockchain.rb', line 126

def block(hash)
  json = Sibit::Json.new(http: @http, log: @log).get(
    URI("https://blockchain.info/rawblock/#{hash}")
  )
  {
    hash: json['hash'],
    orphan: !json['main_chain'],
    next: json['next_block'][0],
    previous: json['prev_block'],
    txns: json['tx'].map do |t|
      {
        hash: t['hash'],
        outputs: t['out'].map do |o|
          {
            address: o['addr'],
            value: o['value']
          }
        end
      }
    end
  }
end

#fees ⇒ Object

Get recommended fees.

Raises:



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# File 'lib/sibit/blockchain.rb', line 87

def fees
  raise Sibit::NotSupportedError, 'fees() is not provided by Blockchain API'
end

#height(hash) ⇒ Object

The height of the block.



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# File 'lib/sibit/blockchain.rb', line 66

def height(hash)
  json = Sibit::Json.new(http: @http, log: @log).get(
    URI("https://blockchain.info/rawblock/#{hash}")
  )
  h = json['height']
  @log.info("The height of #{hash} is #{h}")
  h
end

#latest ⇒ Object

Gets the hash of the latest block.



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# File 'lib/sibit/blockchain.rb', line 117

def latest
  hash = Sibit::Json.new(http: @http, log: @log).get(
    URI('https://blockchain.info/latestblock')
  )['hash']
  @log.info("The latest block hash is #{hash}")
  hash
end

#next_of(_hash) ⇒ Object

Get hash of the block after this one.

Raises:



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# File 'lib/sibit/blockchain.rb', line 61

def next_of(_hash)
  raise Sibit::NotSupportedError, 'Blockchain API doesn\'t provide next_of()'
end

#price(currency = 'USD') ⇒ Object

Current price of BTC in USD (float returned).

Raises:



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# File 'lib/sibit/blockchain.rb', line 50

def price(currency = 'USD')
  h = Sibit::Json.new(http: @http, log: @log).get(
    URI('https://blockchain.info/ticker')
  )[currency]
  raise Error, "Unrecognized currency #{currency}" if h.nil?
  price = h['15m']
  @log.info("The price of BTC is #{price} USD")
  price
end

#push(hex) ⇒ Object

Push this transaction (in hex format) to the network.



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# File 'lib/sibit/blockchain.rb', line 108

def push(hex)
  return if @dry
  Sibit::Json.new(http: @http, log: @log).post(
    URI('https://blockchain.info/pushtx'),
    hex
  )
end

#utxos(sources) ⇒ Object

Fetch all unspent outputs per address. The argument is an array of Bitcoin addresses.



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# File 'lib/sibit/blockchain.rb', line 93

def utxos(sources)
  Sibit::Json.new(http: @http, log: @log).get(
    URI("https://blockchain.info/unspent?active=#{sources.join('|')}&limit=1000")
  )['unspent_outputs'].map do |u|
    {
      value: u['value'],
      hash: u['tx_hash_big_endian'],
      index: u['tx_output_n'],
      confirmations: u['confirmations'],
      script: [u['script']].pack('H*')
    }
  end
end