cic-stack/apps/cic-ussd/cic_ussd/transactions.py

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2021-02-06 16:13:47 +01:00
# standard imports
import decimal
import logging
from datetime import datetime
# third-party imports
from cic_eth.api import Api
# local imports
from cic_ussd.notifications import Notifier
logg = logging.getLogger()
notifier = Notifier()
def truncate(value: float, decimals: int):
"""This function truncates a value to a specified number of decimals places.
:param value: The value to be truncated.
:type value: float
:param decimals: The number of decimals for the value to be truncated to
:type decimals: int
:return: The truncated value.
:rtype: int
"""
decimal.getcontext().rounding = decimal.ROUND_DOWN
contextualized_value = decimal.Decimal(value)
return round(contextualized_value, decimals)
def from_wei(value: int) -> float:
"""This function converts values in Wei to a token in the cic network.
:param value: Value in Wei
:type value: int
:return: SRF equivalent of value in Wei
:rtype: float
"""
value = float(value) / 1e+18
return truncate(value=value, decimals=2)
def to_wei(value: int) -> int:
"""This functions converts values from a token in the cic network to Wei.
:param value: Value in SRF
:type value: int
:return: Wei equivalent of value in SRF
:rtype: int
"""
return int(value * 1e+18)
class IncomingTransactionProcessor:
def __init__(self, phone_number: str, preferred_language: str, token_symbol: str, value: int):
"""
:param phone_number: The recipient's phone number.
:type phone_number: str
:param preferred_language: The user's preferred language.
:type preferred_language: str
:param token_symbol: The symbol for the token the recipient receives.
:type token_symbol: str
:param value: The amount of tokens received in the transactions.
:type value: int
"""
self.phone_number = phone_number
self.preferred_language = preferred_language
self.token_symbol = token_symbol
self.value = value
def process_token_gift_incoming_transactions(self, first_name: str):
"""This function processes incoming transactions with a "tokengift" param, it collects all appropriate data to
send out notifications to users when their accounts are successfully created.
:param first_name: The first name of the recipient of the token gift transaction.
:type first_name: str
"""
balance = from_wei(value=self.value)
key = 'sms.account_successfully_created'
notifier.send_sms_notification(key=key,
phone_number=self.phone_number,
preferred_language=self.preferred_language,
balance=balance,
first_name=first_name,
token_symbol=self.token_symbol)
def process_transfer_incoming_transaction(self, sender_information: str):
"""This function processes incoming transactions with the "transfer" param and issues notifications to users
about reception of funds into their accounts.
:param sender_information: A string with a user's full name and phone number.
:type sender_information: str
"""
key = 'sms.received_tokens'
amount = from_wei(value=self.value)
timestamp = datetime.now().strftime('%d-%m-%y, %H:%M %p')
logg.debug('Balance requires implementation of cic-eth integration with balance.')
notifier.send_sms_notification(key=key,
phone_number=self.phone_number,
preferred_language=self.preferred_language,
amount=amount,
token_symbol=self.token_symbol,
tx_sender_information=sender_information,
timestamp=timestamp,
balance='')
class OutgoingTransactionProcessor:
def __init__(self, chain_str: str, from_address: str, to_address: str):
"""
:param chain_str: The chain name and network id.
:type chain_str: str
:param from_address: Ethereum address of the sender
:type from_address: str, 0x-hex
:param to_address: Ethereum address of the recipient
:type to_address: str, 0x-hex
"""
self.cic_eth_api = Api(chain_str=chain_str)
self.from_address = from_address
self.to_address = to_address
def process_outgoing_transfer_transaction(self, amount: int, token_symbol='SRF'):
"""This function initiates standard transfers between one account to another
:param amount: The amount of tokens to be sent
:type amount: int
:param token_symbol: ERC20 token symbol of token to send
:type token_symbol: str
"""
self.cic_eth_api.transfer(from_address=self.from_address,
to_address=self.to_address,
value=to_wei(value=amount),
token_symbol=token_symbol)