cic-cli/cic/ext/eth/__init__.py

# standard imports
import logging
import copy

# external imports
from chainlib.chain import ChainSpec
from chainlib.eth.tx import (
        TxFormat,
        TxFactory,
        )
from chainlib.eth.connection import RPCConnection
from chainlib.eth.contract import (
        ABIContractEncoder,
        ABIContractType
        )
from chainlib.eth.address import is_address
from eth_token_index import TokenUniqueSymbolIndex
from eth_address_declarator import Declarator

logg = logging.getLogger(__name__)


class CICEth:

    def __init__(self, chain_spec, resources, proofs, signer=None, rpc=None, nonce_oracle=None, fee_oracle=None):
        """resources will be modified
        """
        self.resources = resources
        self.proofs = proofs
        self.chain_spec = chain_spec
        self.signer = signer
        self.rpc = rpc
        self.nonce_oracle = nonce_oracle
        self.fee_oracle = fee_oracle
        self.token_details = None
        self.token_address = None
        self.token_code = None
        self.outputs = []
        self.tx_format = TxFormat.RAW_ARGS
        if self.rpc != None:
            self.tx_format = TxFormat.JSONRPC
        elif self.signer != None:
            self.tx_format = TxFormat.RLP_SIGNED


    def prepare_token(self, name, symbol, precision, code, extra=[], extra_types=[], positions=None):
        self.token_details = {
                'name': name,
                'symbol': symbol,
                'precision': precision,
                'code': code,
                'extra': extra,
                'extra_types': extra_types,
                'positions': positions,
                }

    
    def __detect_arg_type(self, v):
        typ = None
        try:
            int(v, 10)
            typ = ABIContractType.UINT256
        except TypeError:
            pass
   
        if typ == None:
            try:
                vv = strip_0x(v)
                if is_address(vv):
                    typ =  ABIContractType.ADDRESS
                else:
                    typ =  ABIContractType.BYTES32
            except ValueError:
                pass

        if typ == None:
            try:
                v.encode('utf-8') 
                typ =  ABIContractType.STRING
            except ValueError:
                pass

        if typ == None:
            raise ValueError('cannot automatically determine type for value {}'.format(v))

        logg.info('argument {} parsed as abi contract type {}'.format(typ.value))

        return typ


    def __order_args(self):
        args = [
                self.token_details['name'],
                self.token_details['symbol'],
                self.token_details['precision'],
                ]
        args_types = [
                ABIContractType.STRING.value,
                ABIContractType.STRING.value,
                ABIContractType.UINT256.value,
                ]

        for i, x in enumerate(self.token_details['extra']):
            args.append(x)
            typ = None
            if self.token_details['extra_types'] != None:
                typ = self.token_details['extra_types'][i]
            else:
                typ = self.__detect_arg_type(x)
            arg_types.append(typ)

        positions = self.token_details['positions']
        if positions == None:
            positions = list(range(len(args)))
       
        return (args, args_types, positions)


    def process_token(self):
        (args, args_types, positions) = self.__order_args()

        enc = ABIContractEncoder()

        for i in positions:
            getattr(enc, args_types[i])(args[i]) 

        code = self.token_details['code'] + enc.get()

        signer_address = self.resources['token']['key_address']
        c = TxFactory(self.chain_spec, signer=self.signer, nonce_oracle=self.nonce_oracle, gas_oracle=self.fee_oracle)
        tx = c.template(signer_address, None, use_nonce=True)
        tx = c.set_code(tx, code)
        o = c.finalize(tx, self.tx_format)

        r = None
        if self.rpc != None:
            r = self.rpc.do(o[1])
        elif self.signer != None:
            r = o[1]

        if r == None:
            r = code

        self.outputs.append(r)
        return r


    def process_token_index(self):
        c = TokenUniqueSymbolIndex(self.chain_spec, signer=self.signer)

        contract_address = self.resources['token_index']['reference']
        signer_address = self.resources['token_index']['key_address']
        o = c.register(contract_address, signer_address, self.token_address, tx_format=self.tx_format)
        r = None
        if self.rpc != None:
            r = self.rpc.do(o[1])
        elif self.signer != None:
            r = o[1]
        else:
            r = o

        self.outputs.append(r)
        return r


    def process_address_declarator(self):
        c = Declarator(self.chain_spec, signer=self.signer)

        contract_address = self.resources['address_declarator']['reference']
        signer_address = self.resources['address_declarator']['key_address']

        r = []
        for proof in self.proofs:
            o = c.add_declaration(contract_address, signer_address, self.token_address, proof, tx_format=self.tx_format)
            if self.rpc != None:
                r.append(self.rpc.do(o[1]))
            elif self.signer != None:
                r.append(o[1])
            else:
                r.append(o)

        self.outputs += r
        return r


    def process(self):
        self.token_address = self.resources['token']['reference']
        if self.token_address == None:
            tasks.append('token')

        for k in self.resources.keys():
            if k == 'token':
                continue
            if self.resources[k]['reference'] != None:
                tasks.append(k)
                
        for task in tasks:
            getattr(self, 'process_̈́ ' + task)()


def new(resources, proofs, signer_hint=None):
    return CICEth(resources, proofs, signer=None)