Class: VChainClient::BlockchainConnection

Inherits:
Object
  • Object
show all
Defined in:
lib/vchain_client/blockchain_connection.rb

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ BlockchainConnection

Returns a new instance of BlockchainConnection.



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# File 'lib/vchain_client/blockchain_connection.rb', line 9

def initialize(config)
  @config = config

  @log = Log4r::Logger["vchain_client"]
end

Instance Method Details

#getTx(txid) ⇒ Object 



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# File 'lib/vchain_client/blockchain_connection.rb', line 15

def getTx(txid)

   if @log.debug?
     @log.debug("[BlockchainConnection.getTx] input:")
     @log.debug("-> txid: #{txid}")
   end

  adapters = []

   if !@config.key?("blockchain_adapters")
     raise "There are no blockchain_adapters in config"
   end

  config_adapters = @config["blockchain_adapters"]

   if config_adapters.length <= 0
     raise "There are no blockchain_adapters in config"
   end

  config_adapters.each { |adapter_config|

     begin
     
       adapter = VChainClient::BlockchainAdapterFactory.getAdapter(adapter_config["type"], adapter_config, @config)

     rescue => e
       if @log.error?
         @log.error("[BlockchainConnection.getTx] BlockchainAdapterFactory.getAdapter raised exception:")
         @log.error("#{e.class}, #{e.message}")
         @log.error("-> txid: #{txid}")
         @log.error("--> type: "+ adapter_config["type"])
       end

       raise e
     end

    if adapter != nil
      
       adapters.push(adapter)

     else 
       if @log.error?
         @log.error("[BlockchainConnection.getTx] failed to init BlockchainAdapter")
         @log.error("-> txid: #{txid}")
         @log.error("--> type: "+ adapter_config["type"])
       end
    end
  }

  if adapters.length > 0

     prev_size = nil
     prev_block_hash = nil
     prev_block_timestamp = nil
     prev_op_return = nil

     adapters.each { |adapter|

       tx = nil

       begin

        tx = adapter.getTx(txid)

       rescue => e
         if @log.error?
           @log.error("[BlockchainConnection.getTx] adapter.getTx raised exception:")
           @log.error("#{e.class}, #{e.message}")
           @log.error("-> txid: #{txid}")
           @log.error("--> txid: #{txid}")
           @log.error("--> adapter: "+ adapter.getName())
         end

         raise e
       end

      if tx == nil
         if @log.error?
           @log.error("[BlockchainConnection.getTx] failed to get tx")
           @log.error("-> txid: #{txid}")
           @log.error("--> txid: #{txid}")
           @log.error("--> adapter: "+ adapter.getName())
         end

        return nil
      end

      if !tx.key?("block_hash")
         if @log.error?
           @log.error("[BlockchainConnection.getTx] no 'block_hash' field")
           @log.error("-> txid: #{txid}")
           @log.error("--> txid: #{txid}")
           @log.error("--> adapter: "+ adapter.getName())
         end

        return nil
      end

      if !tx.key?("block_timestamp")
         if @log.error?
           @log.error("[BlockchainConnection.getTx] no 'block_timestamp' field")
           @log.error("-> txid: #{txid}")
           @log.error("--> txid: #{txid}")
           @log.error("--> adapter: "+ adapter.getName())
         end

        return nil
      end

      if tx["block_hash"] == nil || tx["block_hash"] == ""
         if @log.error?
           @log.error("[BlockchainConnection.getTx] 'block_hash' field is empty")
           @log.error("-> txid: #{txid}")
           @log.error("--> txid: #{txid}")
           @log.error("--> adapter: "+ adapter.getName())
         end

        return nil
      end

    size = tx["size"]
    block_hash = tx["block_hash"]
    block_timestamp = tx["block_timestamp"]
    op_return = tx["op_return"]

    if prev_size != nil && prev_size != size
         if @log.error?
           @log.error("[BlockchainConnection.getTx] size mismatch")
           @log.error("-> txid: #{txid}")
           @log.error("--> txid: #{txid}")
           @log.error("--> adapter: "+ adapter.getName())
         end

         return nil
    end

       if prev_block_hash != nil && prev_block_hash != block_hash
         if @log.error?
           @log.error("[BlockchainConnection.getTx] block_hash mismatch")
           @log.error("-> txid: #{txid}")
           @log.error("--> txid: #{txid}")
           @log.error("--> adapter: "+ adapter.getName())
         end

         return nil
       end

       if prev_block_timestamp != nil && prev_block_timestamp != block_timestamp
         if @log.error?
           @log.error("[BlockchainConnection.getTx] block_timestamp mismatch")
           @log.error("-> txid: #{txid}")
           @log.error("--> txid: #{txid}")
           @log.error("--> adapter: "+ adapter.getName())
         end

         return nil
       end

       if prev_op_return != nil && prev_op_return != op_return
         if @log.error?
           @log.error("[BlockchainConnection.getTx] op_return mismatch")
           @log.error("-> txid: #{txid}")
           @log.error("--> txid: #{txid}")
           @log.error("--> adapter: "+ adapter.getName())
         end

         return nil
       end

       prev_size = size
       prev_block_hash = block_hash
       prev_block_timestamp = block_timestamp
       prev_op_return = op_return
    }

     return {
       "block_hash"      => prev_block_hash,
       "block_timestamp" => prev_block_timestamp,
       "op_return"       => prev_op_return
  }

   else
     raise "There are no initialized blockchain_adapters"
  end

  return nil
end