Class: Web3::Eth::Contract::ContractMethod

Inherits:
Object
  • Object
show all
Includes:
Abi::AbiCoder, Abi::Utils, Utility
Defined in:
lib/web3/eth/contract.rb

Direct Known Subclasses

ContractConstructor

Constant Summary

Constants included from Abi::Constant

Abi::Constant::BYTE_EMPTY, Abi::Constant::BYTE_ONE, Abi::Constant::BYTE_ZERO, Abi::Constant::CONTRACT_CODE_SIZE_LIMIT, Abi::Constant::HASH_ZERO, Abi::Constant::INT_MAX, Abi::Constant::INT_MIN, Abi::Constant::PRIVKEY_ZERO, Abi::Constant::PRIVKEY_ZERO_HEX, Abi::Constant::PUBKEY_ZERO, Abi::Constant::TT160, Abi::Constant::TT256, Abi::Constant::TT32, Abi::Constant::TT40, Abi::Constant::TT64M1, Abi::Constant::UINT_MAX, Abi::Constant::UINT_MIN

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Utility

#from_hex, #hex, #remove_0x_head, #wei_to_ether

Methods included from Abi::Utils

#base58_check_to_bytes, #big_endian_to_int, #bytearray_to_int, #bytes_to_base58_check, #bytes_to_int_array, #ceil32, #coerce_addr_to_hex, #coerce_to_bytes, #coerce_to_int, #decode_hex, #decode_int, #double_sha256, #encode_hex, #encode_int, #function_signature, #hash160, #hash160_hex, #int_array_to_bytes, #int_to_addr, #int_to_big_endian, #keccak256, #keccak256_rlp, #keccak512, #lpad, #mk_contract_address, #mk_metropolis_contract_address, #mod_exp, #mod_mul, #normalize_address, #normalize_hex_without_prefix, #parse_int_or_hex, #ripemd160, #rpad, #sha256, #to_signed, #zpad, #zpad_hex, #zpad_int, #zunpad

Methods included from Abi::AbiCoder

#decode_abi, #decode_primitive_type, #decode_type, #decode_typed_data, #encode_abi, #encode_primitive_type, #encode_type, #min_data_size, #zero_padding

Constructor Details

#initialize(abi) ⇒ ContractMethod

Returns a new instance of ContractMethod.



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# File 'lib/web3/eth/contract.rb', line 34

def initialize abi
  @abi = abi
  @name = abi['name']
  @constant = !!abi['constant'] || abi['stateMutability']=='view'
  @input_types = abi['inputs'] ? abi['inputs'].map{|a| parse_component_type a } : []
  @output_types = abi['outputs'].map{|a| parse_component_type a } if abi['outputs']
  @signature = Abi::Utils.function_signature @name, @input_types
  @signature_hash = Abi::Utils.signature_hash @signature, (abi['type'].try(:downcase)=='event' ? 64 : 8)
end

Instance Attribute Details

#abi ⇒ Object (readonly)

Returns the value of attribute abi.



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# File 'lib/web3/eth/contract.rb', line 32

def abi
  @abi
end

#constant ⇒ Object (readonly)

Returns the value of attribute constant.



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# File 'lib/web3/eth/contract.rb', line 32

def constant
  @constant
end

#input_types ⇒ Object (readonly)

Returns the value of attribute input_types.



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# File 'lib/web3/eth/contract.rb', line 32

def input_types
  @input_types
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/web3/eth/contract.rb', line 32

def name
  @name
end

#output_types ⇒ Object (readonly)

Returns the value of attribute output_types.



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# File 'lib/web3/eth/contract.rb', line 32

def output_types
  @output_types
end

#signature ⇒ Object (readonly)

Returns the value of attribute signature.



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# File 'lib/web3/eth/contract.rb', line 32

def signature
  @signature
end

#signature_hash ⇒ Object (readonly)

Returns the value of attribute signature_hash.



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# File 'lib/web3/eth/contract.rb', line 32

def signature_hash
  @signature_hash
end

Instance Method Details

#do_call(web3_rpc, contract_address, args) ⇒ Object 



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# File 'lib/web3/eth/contract.rb', line 92

def do_call web3_rpc, contract_address, args
  data = '0x' + signature_hash + encode_hex(encode_abi(input_types, args) )

  response = web3_rpc.eth.call [{ to: contract_address, data: data}, 'latest']

  string_data = [remove_0x_head(response)].pack('H*')
  return nil if string_data.empty?

  result = decode_abi output_types, string_data
  result.length==1 ? result.first : result
end

#parse_component_type(argument) ⇒ Object 



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# File 'lib/web3/eth/contract.rb', line 44

def parse_component_type argument
  if argument['type']=~/^tuple((\[[0-9]*\])*)/
    argument['components'] ? "(#{argument['components'].collect{|c| parse_component_type c }.join(',')})#{$1}" : "()#{$1}"
  else
    argument['type']
  end
end

#parse_event_args(log) ⇒ Object 



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# File 'lib/web3/eth/contract.rb', line 52

def parse_event_args log

  log_data = remove_0x_head log.raw_data['data']
  indexed_types = abi['inputs'].select{|a| a['indexed']}.collect{|a| parse_component_type a }
  not_indexed_types = abi['inputs'].select{|a| !a['indexed']}.collect{|a| parse_component_type a }

  indexed_args = log.indexed_args

  if indexed_args.size==indexed_types.size

    indexed_values = [indexed_types, indexed_args].transpose.collect{|arg|
      decode_typed_data( arg.first, [arg.second].pack('H*') )
    }

    not_indexed_values = not_indexed_types.empty? ? [] :
                             decode_abi(not_indexed_types, [log_data].pack('H*') )

    i = j = 0

    abi['inputs'].collect{|input|
      input['indexed'] ? (i+=1; indexed_values[i-1]) : (j+=1;not_indexed_values[j-1])
    }

  elsif !indexed_args.empty? || !log_data.empty?
    all_types = abi['inputs'].collect{|a| parse_component_type a }
    [all_types[0...indexed_args.size], indexed_args].transpose.collect{|arg|
      decode_typed_data( arg.first, [arg.second].pack('H*') )
    } + decode_abi(all_types[indexed_args.size..-1], [log_data].pack('H*') )
  else
    []
  end

end

#parse_method_args(transaction) ⇒ Object 



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# File 'lib/web3/eth/contract.rb', line 87

def parse_method_args transaction
  d = transaction.call_input_data
  (!d || d.empty?) ? [] : decode_abi(input_types, [d].pack('H*'))
end