178 lines
6.9 KiB
Python
178 lines
6.9 KiB
Python
# standard import
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import logging
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from math import trunc
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from typing import Dict, Tuple
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# external import
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from cic_eth.api import Api
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from sqlalchemy.orm.session import Session
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# local import
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from cic_ussd.db.models.account import Account
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from cic_ussd.db.models.base import SessionBase
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from cic_ussd.error import UnknownUssdRecipient
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from cic_ussd.translation import translation_for
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logg = logging.getLogger(__name__)
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def _add_tags(action_tag_key: str, preferred_language: str, direction_tag_key: str, transaction: dict):
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""" This function adds action and direction tags to a transaction data object.
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:param action_tag_key: Key mapping to a helper entry in the translation files describing an action.
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:type action_tag_key: str
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:param preferred_language: An account's set preferred language.
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:type preferred_language: str
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:param direction_tag_key: Key mapping to a helper entry in the translation files describing a transaction's
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direction relative to the transaction's subject account.
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:type direction_tag_key: str
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:param transaction: Parsed transaction data object.
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:type transaction: dict
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"""
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action_tag = translation_for(action_tag_key, preferred_language)
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direction_tag = translation_for(direction_tag_key, preferred_language)
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transaction['action_tag'] = action_tag
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transaction['direction_tag'] = direction_tag
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def aux_transaction_data(preferred_language: str, transaction: dict) -> dict:
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"""This function adds auxiliary data to a transaction object offering contextual information relative to the
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subject account's role in the transaction.
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:param preferred_language: An account's set preferred language.
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:type preferred_language: str
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:param transaction: Parsed transaction data object.
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:type transaction: dict
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:return: Transaction object with contextual data.
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:rtype: dict
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"""
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role = transaction.get('role')
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if role == 'recipient':
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_add_tags('helpers.received', preferred_language, 'helpers.from', transaction)
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if role == 'sender':
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_add_tags('helpers.sent', preferred_language, 'helpers.to', transaction)
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return transaction
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def from_wei(decimals: int, value: int) -> float:
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"""This function converts values in Wei to a token in the cic network.
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:param decimals: The decimals required for wei values.
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:type decimals: int
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:param value: Value in Wei
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:type value: int
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:return: SRF equivalent of value in Wei
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:rtype: float
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"""
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value = float(value) / (10**decimals)
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return truncate(value=value, decimals=2)
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def to_wei(decimals: int, value: int) -> int:
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"""This functions converts values from a token in the cic network to Wei.
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:param decimals: The decimals required for wei values.
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:type decimals: int
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:param value: Value in SRF
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:type value: int
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:return: Wei equivalent of value in SRF
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:rtype: int
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"""
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return int(value * (10**decimals))
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def truncate(value: float, decimals: int) -> float:
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"""This function truncates a value to a specified number of decimals places.
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:param value: The value to be truncated.
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:type value: float
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:param decimals: The number of decimals for the value to be truncated to
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:type decimals: int
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:return: The truncated value.
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:rtype: int
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"""
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stepper = 10.0**decimals
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return trunc(stepper*value) / stepper
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def transaction_actors(transaction: dict) -> Tuple[Dict, Dict]:
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""" This function parses transaction data into a tuple of transaction data objects representative of
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of the source and destination account's involved in a transaction.
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:param transaction: Transaction data object.
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:type transaction: dict
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:return: Recipient and sender transaction data object
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:rtype: Tuple[Dict, Dict]
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"""
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destination_token_symbol = transaction.get('destination_token_symbol')
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destination_token_value = transaction.get('destination_token_value') or transaction.get('to_value')
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recipient_blockchain_address = transaction.get('recipient')
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sender_blockchain_address = transaction.get('sender')
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source_token_symbol = transaction.get('source_token_symbol')
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source_token_value = transaction.get('source_token_value') or transaction.get('from_value')
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recipient_transaction_data = {
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"token_symbol": destination_token_symbol,
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"token_value": destination_token_value,
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"blockchain_address": recipient_blockchain_address,
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"role": "recipient",
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}
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sender_transaction_data = {
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"blockchain_address": sender_blockchain_address,
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"token_symbol": source_token_symbol,
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"token_value": source_token_value,
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"role": "sender",
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}
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return recipient_transaction_data, sender_transaction_data
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def validate_transaction_account(blockchain_address: str, role: str, session: Session) -> Account:
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"""This function checks whether the blockchain address specified in a parsed transaction object resolves to an
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account object in the ussd system.
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:param blockchain_address:
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:type blockchain_address:
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:param role:
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:type role:
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:param session:
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:type session:
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:return:
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:rtype:
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"""
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session = SessionBase.bind_session(session)
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account = session.query(Account).filter_by(blockchain_address=blockchain_address).first()
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if not account:
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if role == 'recipient':
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raise UnknownUssdRecipient(
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f'Tx for recipient: {blockchain_address} has no matching account in the system.'
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)
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if role == 'sender':
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logg.warning(f'Tx from sender: {blockchain_address} has no matching account in system.')
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SessionBase.release_session(session)
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return account
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class OutgoingTransaction:
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def __init__(self, chain_str: str, from_address: str, to_address: str):
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"""
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:param chain_str: The chain name and network id.
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:type chain_str: str
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:param from_address: Ethereum address of the sender
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:type from_address: str, 0x-hex
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:param to_address: Ethereum address of the recipient
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:type to_address: str, 0x-hex
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"""
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self.chain_str = chain_str
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self.cic_eth_api = Api(chain_str=chain_str)
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self.from_address = from_address
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self.to_address = to_address
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def transfer(self, amount: int, decimals: int, token_symbol: str):
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"""This function initiates standard transfers between one account to another
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:param amount: The amount of tokens to be sent
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:type amount: int
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:param decimals: The decimals for the token being transferred.
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:type decimals: int
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:param token_symbol: ERC20 token symbol of token to send
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:type token_symbol: str
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"""
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self.cic_eth_api.transfer(from_address=self.from_address,
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to_address=self.to_address,
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value=to_wei(decimals=decimals, value=amount),
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token_symbol=token_symbol)
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