Class: Dcha::Chain

Inherits:
Object
  • Object
show all
Defined in:
lib/dcha/chain.rb

Overview

:nodoc:

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Chain

Returns a new instance of Chain.



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# File 'lib/dcha/chain.rb', line 6

def initialize
  @blocks = [Block::GENESIS]
end

Instance Attribute Details

#blocks ⇒ Object (readonly)

Returns the value of attribute blocks.



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# File 'lib/dcha/chain.rb', line 4

def blocks
  @blocks
end

Instance Method Details

#add_block(block) ⇒ Object 



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# File 'lib/dcha/chain.rb', line 10

def add_block(block)
  blocks << block if block.valid_after?(blocks.last)

  unless valid_chain?
    @blocks = @blocks[0..-2]
    return false
  end

  true
end

#create_and_add_block(root_hash) ⇒ Object 



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# File 'lib/dcha/chain.rb', line 21

def create_and_add_block(root_hash)
  add_block(Block.new(
    index: blocks.last.index + 1,
    parent_hash: blocks.last.hash,
    root_hash: root_hash
  ).make_proof)
end

#replace_with(new_blocks) ⇒ Object 



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# File 'lib/dcha/chain.rb', line 29

def replace_with(new_blocks)
  new_blocks = [Block::GENESIS] + new_blocks
  return unless valid_chain?(new_blocks) &&
                new_blocks.length > blocks.length
  @blocks = new_blocks
  true
end

#valid_chain?(blocks = @blocks) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dcha/chain.rb', line 37

def valid_chain?(blocks = @blocks)
  valid = true
  blocks.each.with_index(0) do |block, idx|
    valid &&= if idx.zero?
                Oj.dump(block) == Oj.dump(Block::GENESIS)
              else
                block.valid_after?(blocks[idx - 1])
              end
  end
  valid
end