Class: Ethereum::Contract

Inherits:
Object
  • Object
show all
Defined in:
lib/ethereum/contract.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, code, abi) ⇒ Contract

Returns a new instance of Contract.



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# File 'lib/ethereum/contract.rb', line 6

def initialize(name, code, abi)
  @name = name
  @code = code
  @abi = abi
  @functions = []
  @events = []
  @constructor_inputs = @abi.detect {|x| x["type"] == "constructor"}["inputs"] rescue nil
  @abi.select {|x| x["type"] == "function" }.each do |abifun|
    @functions << Ethereum::Function.new(abifun) 
  end
  @abi.select {|x| x["type"] == "event" }.each do |abievt|
    @events << Ethereum::ContractEvent.new(abievt)
  end
end

Instance Attribute Details

#abi ⇒ Object

Returns the value of attribute abi.



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# File 'lib/ethereum/contract.rb', line 4

def abi
  @abi
end

#code ⇒ Object

Returns the value of attribute code.



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# File 'lib/ethereum/contract.rb', line 4

def code
  @code
end

#constructor_inputs ⇒ Object

Returns the value of attribute constructor_inputs.



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# File 'lib/ethereum/contract.rb', line 4

def constructor_inputs
  @constructor_inputs
end

#events ⇒ Object

Returns the value of attribute events.



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# File 'lib/ethereum/contract.rb', line 4

def events
  @events
end

#functions ⇒ Object

Returns the value of attribute functions.



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# File 'lib/ethereum/contract.rb', line 4

def functions
  @functions
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/ethereum/contract.rb', line 4

def name
  @name
end

Instance Method Details

#build(connection) ⇒ Object 



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# File 'lib/ethereum/contract.rb', line 21

def build(connection)
  class_name = @name
  functions = @functions
  constructor_inputs = @constructor_inputs
  binary = @code
  events = @events

  class_methods = Class.new do

    define_method "connection".to_sym do
      connection
    end

    define_method :deploy do |*params|
      formatter = Ethereum::Formatter.new
      deploy_code = binary
      deploy_arguments = ""
      if constructor_inputs.present?
        raise "Missing constructor parameter" and return if params.length != constructor_inputs.length
        constructor_inputs.each_index do |i|
          args = [constructor_inputs[i]["type"], params[i]]
          deploy_arguments << formatter.to_payload(args)
        end
      end
      deploy_payload = deploy_code + deploy_arguments
      deploytx = connection.send_transaction({from: self.sender, gas: self.gas, gasPrice: self.gas_price, data: "0x" + deploy_payload})["result"]
      instance_variable_set("@deployment", Ethereum::Deployment.new(deploytx, connection))
    end

    define_method :events do
      return events
    end

    define_method :deployment do
      instance_variable_get("@deployment")
    end

    define_method :deploy_and_wait do |time = 60.seconds, *params|
      self.deploy(*params)
      self.deployment.wait_for_deployment(time)
      instance_variable_set("@address", self.deployment.contract_address)
      self.events.each do |event|
        event.set_address(self.deployment.contract_address)
        event.set_client(connection)
      end
    end

    define_method :at do |addr|
      instance_variable_set("@address", addr) 
      self.events.each do |event|
        event.set_address(addr)
        event.set_client(connection)
      end
    end

    define_method :address do
      instance_variable_get("@address")
    end

    define_method :as do |addr|
      instance_variable_set("@sender", addr)
    end

    define_method :sender do
      instance_variable_get("@sender") || connection.coinbase["result"]
    end

    define_method :set_gas_price do |gp|
      instance_variable_set("@gas_price", gp)
    end

    define_method :gas_price do
      instance_variable_get("@gas_price") || 60000000000
    end

    define_method :set_gas do |gas|
      instance_variable_set("@gas", gas)
    end

    define_method :gas do 
      instance_variable_get("@gas") || 3000000
    end

    events.each do |evt|
      define_method "nf_#{evt.name.underscore}".to_sym do |params = {}|
        params[:to_block] ||= "latest"
        params[:from_block] ||= "0x0"
        params[:address] ||=  instance_variable_get("@address")
        params[:topics] = evt.signature
        payload = {topics: [params[:topics]], fromBlock: params[:from_block], toBlock: params[:to_block], address: params[:address]}
        filter_id = connection.new_filter(payload)
        return filter_id["result"]
      end

      define_method "gfl_#{evt.name.underscore}".to_sym do |filter_id|
        formatter = Ethereum::Formatter.new
        logs = connection.get_filter_logs(filter_id)
        collection = []
        logs["result"].each do |result|
          inputs = evt.input_types
          outputs = inputs.zip(result["topics"][1..-1])
          data = {blockNumber: result["blockNumber"].hex, transactionHash: result["transactionHash"], blockHash: result["blockHash"], transactionIndex: result["transactionIndex"].hex, topics: []} 
          outputs.each do |output|
            data[:topics] << formatter.from_payload(output)
          end
          collection << data 
        end
        return collection
      end

      define_method "gfc_#{evt.name.underscore}".to_sym do |filter_id|
        formatter = Ethereum::Formatter.new
        logs = connection.get_filter_changes(filter_id)
        collection = []
        logs["result"].each do |result|
          inputs = evt.input_types
          outputs = inputs.zip(result["topics"][1..-1])
          data = {blockNumber: result["blockNumber"].hex, transactionHash: result["transactionHash"], blockHash: result["blockHash"], transactionIndex: result["transactionIndex"].hex, topics: []} 
          outputs.each do |output|
            data[:topics] << formatter.from_payload(output)
          end
          collection << data 
        end
        return collection
      end

    end

    functions.each do |fun|

      fun_count = functions.select {|x| x.name == fun.name }.count
      derived_function_name = (fun_count == 1) ? "#{fun.name.underscore}" : "#{fun.name.underscore}__#{fun.inputs.collect {|x| x.type}.join("__")}"
      call_function_name = "call_#{derived_function_name}".to_sym
      call_function_name_alias = "c_#{derived_function_name}".to_sym
      call_raw_function_name = "call_raw_#{derived_function_name}".to_sym
      call_raw_function_name_alias = "cr_#{derived_function_name}".to_sym
      transact_function_name = "transact_#{derived_function_name}".to_sym
      transact_function_name_alias = "t_#{derived_function_name}".to_sym
      transact_and_wait_function_name = "transact_and_wait_#{derived_function_name}".to_sym
      transact_and_wait_function_name_alias = "tw_#{derived_function_name}".to_sym

      define_method call_raw_function_name do |*args|
        formatter = Ethereum::Formatter.new
        arg_types = fun.inputs.collect(&:type)
        connection = self.connection
        return {result: :error, message: "missing parameters for #{fun.function_string}" } if arg_types.length != args.length
        payload = []
        payload << fun.signature
        arg_types.zip(args).each do |arg|
          payload << formatter.to_payload(arg)
        end
        raw_result = connection.call({to: self.address, from: self.sender, data: payload.join()})["result"]
        formatted_result = fun.outputs.collect {|x| x.type }.zip(raw_result.gsub(/^0x/,'').scan(/.{64}/))
        output = formatted_result.collect {|x| formatter.from_payload(x) }
        return {data: "0x" + payload.join(), raw: raw_result, formatted: output}
      end

      define_method call_function_name do |*args|
        data = self.send(call_raw_function_name, *args)
        output = data[:formatted]
        if output.length == 1 
          return output[0]
        else 
          return output
        end
      end

      define_method transact_function_name do |*args|
        formatter = Ethereum::Formatter.new
        arg_types = fun.inputs.collect(&:type)
        connection = self.connection
        return {result: :error, message: "missing parameters for #{fun.function_string}" } if arg_types.length != args.length
        payload = []
        payload << fun.signature
        arg_types.zip(args).each do |arg|
          payload << formatter.to_payload(arg)
        end
        txid = connection.send_transaction({to: self.address, from: self.sender, data: "0x" + payload.join(), gas: self.gas, gasPrice: self.gas_price})["result"]
        return Ethereum::Transaction.new(txid, self.connection, payload.join(), args)
      end

      define_method transact_and_wait_function_name do |*args|
        function_name = "transact_#{derived_function_name}".to_sym
        tx = self.send(function_name, *args)
        tx.wait_for_miner
        return tx
      end

      alias_method call_function_name_alias, call_function_name
      alias_method call_raw_function_name_alias, call_raw_function_name
      alias_method transact_function_name_alias, transact_function_name
      alias_method transact_and_wait_function_name_alias, transact_and_wait_function_name

    end
  end
  if Object.const_defined?(class_name)
    Object.send(:remove_const, class_name)
  end
  Object.const_set(class_name, class_methods)
end