cic-internal-integration/apps/cic-ussd/cic_ussd/account/tokens.py

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# standard imports
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import hashlib
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import json
import logging
from typing import Optional, Union
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# external imports
from cic_eth.api import Api
from cic_types.condiments import MetadataPointer
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# local imports
from cic_ussd.account.balance import get_cached_available_balance
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from cic_ussd.account.chain import Chain
from cic_ussd.cache import cache_data, cache_data_key, get_cached_data
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from cic_ussd.error import CachedDataNotFoundError, SeppukuError
from cic_ussd.metadata.tokens import query_token_info, query_token_metadata
from cic_ussd.processor.util import wait_for_cache
from cic_ussd.translation import translation_for
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logg = logging.getLogger(__file__)
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def collate_token_metadata(token_info: dict, token_metadata: dict) -> dict:
"""
:param token_info:
:type token_info:
:param token_metadata:
:type token_metadata:
:return:
:rtype:
"""
logg.debug(f'Collating token info: {token_info} and token metadata: {token_metadata}')
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description = token_info.get('description')
issuer = token_info.get('issuer')
location = token_metadata.get('location')
contact = token_metadata.get('contact')
return {
'description': description,
'issuer': issuer,
'location': location,
'contact': contact
}
def create_account_tokens_list(blockchain_address: str):
"""
:param blockchain_address:
:type blockchain_address:
:return:
:rtype:
"""
token_symbols_list = get_cached_token_symbol_list(blockchain_address=blockchain_address)
token_list_entries = []
if token_symbols_list:
logg.debug(f'Token symbols: {token_symbols_list} for account: {blockchain_address}')
for token_symbol in token_symbols_list:
entry = {}
logg.debug(f'Processing token data for: {token_symbol}')
key = cache_data_key([bytes.fromhex(blockchain_address), token_symbol.encode('utf-8')], MetadataPointer.TOKEN_DATA)
token_data = get_cached_data(key)
token_data = json.loads(token_data)
logg.debug(f'Retrieved token data: {token_data} for: {token_symbol}')
token_name = token_data.get('name')
entry['name'] = token_name
token_symbol = token_data.get('symbol')
entry['symbol'] = token_symbol
token_issuer = token_data.get('issuer')
entry['issuer'] = token_issuer
token_contact = token_data['contact'].get('phone')
entry['contact'] = token_contact
token_location = token_data.get('location')
entry['location'] = token_location
decimals = token_data.get('decimals')
identifier = [bytes.fromhex(blockchain_address), token_symbol.encode('utf-8')]
wait_for_cache(identifier, f'Cached available balance for token: {token_symbol}', MetadataPointer.BALANCES)
token_balance = get_cached_available_balance(decimals=decimals, identifier=identifier)
entry['balance'] = token_balance
token_list_entries.append(entry)
account_tokens_list = order_account_tokens_list(token_list_entries, bytes.fromhex(blockchain_address))
key = cache_data_key(bytes.fromhex(blockchain_address), MetadataPointer.TOKEN_DATA_LIST)
cache_data(key, json.dumps(account_tokens_list))
def get_active_token_symbol(blockchain_address: str):
"""
:param blockchain_address:
:type blockchain_address:
:return:
:rtype:
"""
identifier = bytes.fromhex(blockchain_address)
key = cache_data_key(identifier=identifier, salt=MetadataPointer.TOKEN_ACTIVE)
active_token_symbol = get_cached_data(key)
if not active_token_symbol:
raise CachedDataNotFoundError('No active token set.')
return active_token_symbol
def get_cached_token_data(blockchain_address: str, token_symbol: str):
"""
:param blockchain_address:
:type blockchain_address:
:param token_symbol:
:type token_symbol:
:return:
:rtype:
"""
identifier = [bytes.fromhex(blockchain_address), token_symbol.encode('utf-8')]
key = cache_data_key(identifier, MetadataPointer.TOKEN_DATA)
logg.debug(f'Retrieving token data for: {token_symbol} at: {key}')
token_data = get_cached_data(key)
return json.loads(token_data)
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def get_cached_default_token(chain_str: str) -> Optional[str]:
"""This function attempts to retrieve the default token's data from the redis cache.
:param chain_str: chain name and network id.
:type chain_str: str
:return:
:rtype:
"""
logg.debug(f'Retrieving default token from cache for chain: {chain_str}')
key = cache_data_key(identifier=chain_str.encode('utf-8'), salt=MetadataPointer.TOKEN_DEFAULT)
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return get_cached_data(key=key)
def get_default_token_symbol():
"""This function attempts to retrieve the default token's symbol from cached default token's data.
:raises SeppukuError: The system should terminate itself because the default token is required for an appropriate
system state.
:return: Default token's symbol.
:rtype: str
"""
chain_str = Chain.spec.__str__()
cached_default_token = get_cached_default_token(chain_str)
if cached_default_token:
default_token_data = json.loads(cached_default_token)
return default_token_data.get('symbol')
else:
logg.warning('Cached default token data not found. Attempting retrieval from default token API')
default_token_data = query_default_token(chain_str)
if default_token_data:
return default_token_data.get('symbol')
else:
raise SeppukuError(f'Could not retrieve default token for: {chain_str}')
def get_cached_token_symbol_list(blockchain_address: str) -> Optional[list]:
"""
:param blockchain_address:
:type blockchain_address:
:return:
:rtype:
"""
key = cache_data_key(identifier=bytes.fromhex(blockchain_address), salt=MetadataPointer.TOKEN_SYMBOLS_LIST)
token_symbols_list = get_cached_data(key)
if token_symbols_list:
return json.loads(token_symbols_list)
return token_symbols_list
def get_cached_token_data_list(blockchain_address: str) -> Optional[list]:
"""
:param blockchain_address:
:type blockchain_address:
:return:
:rtype:
"""
key = cache_data_key(bytes.fromhex(blockchain_address), MetadataPointer.TOKEN_DATA_LIST)
token_data_list = get_cached_data(key)
if token_data_list:
return json.loads(token_data_list)
return token_data_list
def handle_token_symbol_list(blockchain_address: str, token_symbol: str):
"""
:param blockchain_address:
:type blockchain_address:
:param token_symbol:
:type token_symbol:
:return:
:rtype:
"""
token_symbol_list = get_cached_token_symbol_list(blockchain_address)
if token_symbol_list:
if token_symbol not in token_symbol_list:
token_symbol_list.append(token_symbol)
else:
token_symbol_list = [token_symbol]
identifier = bytes.fromhex(blockchain_address)
key = cache_data_key(identifier=identifier, salt=MetadataPointer.TOKEN_SYMBOLS_LIST)
data = json.dumps(token_symbol_list)
cache_data(key, data)
def hashed_token_proof(token_proof: Union[dict, str]) -> str:
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"""
:param token_proof:
:type token_proof:
:return:
:rtype:
"""
if isinstance(token_proof, dict):
token_proof = json.dumps(token_proof)
logg.debug(f'Hashing token proof: {token_proof}')
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hash_object = hashlib.new("sha256")
hash_object.update(token_proof.encode('utf-8'))
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return hash_object.digest().hex()
def order_account_tokens_list(account_tokens_list: list, identifier: bytes) -> list:
"""
:param account_tokens_list:
:type account_tokens_list:
:param identifier:
:type identifier:
:return:
:rtype:
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"""
ordered_tokens_list = []
# get last sent token
key = cache_data_key(identifier=identifier, salt=MetadataPointer.TOKEN_LAST_SENT)
last_sent_token_symbol = get_cached_data(key)
# get last received token
key = cache_data_key(identifier=identifier, salt=MetadataPointer.TOKEN_LAST_RECEIVED)
last_received_token_symbol = get_cached_data(key)
last_sent_token_data, remaining_accounts_token_list = remove_from_account_tokens_list(account_tokens_list, last_sent_token_symbol)
if last_sent_token_data:
ordered_tokens_list.append(last_sent_token_data[0])
last_received_token_data, remaining_accounts_token_list = remove_from_account_tokens_list(remaining_accounts_token_list, last_received_token_symbol)
if last_received_token_data:
ordered_tokens_list.append(last_received_token_data[0])
# order the by balance
ordered_by_balance = sorted(remaining_accounts_token_list, key=lambda d: d['balance'], reverse=True)
return ordered_tokens_list + ordered_by_balance
def parse_token_list(account_token_list: list):
parsed_token_list = []
for i in range(len(account_token_list)):
token_symbol = account_token_list[i].get('symbol')
token_balance = account_token_list[i].get('balance')
token_data_repr = f'{i+1}. {token_symbol} {token_balance}'
parsed_token_list.append(token_data_repr)
return parsed_token_list
def process_token_data(blockchain_address: str, token_symbol: str):
"""
:param blockchain_address:
:type blockchain_address:
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:param token_symbol:
:type token_symbol:
:return:
:rtype:
"""
logg.debug(f'Processing token data for token: {token_symbol}')
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identifier = token_symbol.encode('utf-8')
query_token_metadata(identifier=identifier)
token_info = query_token_info(identifier=identifier)
hashed_token_info = hashed_token_proof(token_proof=token_info)
query_token_data(blockchain_address=blockchain_address,
hashed_proofs=[hashed_token_info],
token_symbols=[token_symbol])
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def query_default_token(chain_str: str):
"""This function synchronously queries cic-eth for the deployed system's default token.
:param chain_str: Chain name and network id.
:type chain_str: str
:return: Token's data.
:rtype: dict
"""
logg.debug(f'Querying API for default token on chain: {chain_str}')
cic_eth_api = Api(chain_str=chain_str)
default_token_request_task = cic_eth_api.default_token()
return default_token_request_task.get()
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def query_token_data(blockchain_address: str, hashed_proofs: list, token_symbols: list):
""""""
logg.debug(f'Retrieving token metadata for tokens: {", ".join(token_symbols)}')
api = Api(callback_param=blockchain_address,
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callback_queue='cic-ussd',
chain_str=Chain.spec.__str__(),
callback_task='cic_ussd.tasks.callback_handler.token_data_callback')
api.tokens(token_symbols=token_symbols, proof=hashed_proofs)
def remove_from_account_tokens_list(account_tokens_list: list, token_symbol: str):
"""
:param account_tokens_list:
:type account_tokens_list:
:param token_symbol:
:type token_symbol:
:return:
:rtype:
"""
removed_token_data = []
for i in range(len(account_tokens_list)):
if account_tokens_list[i]['symbol'] == token_symbol:
removed_token_data.append(account_tokens_list[i])
del account_tokens_list[i]
break
return removed_token_data, account_tokens_list
def set_active_token(blockchain_address: str, token_symbol: str):
"""
:param blockchain_address:
:type blockchain_address:
:param token_symbol:
:type token_symbol:
:return:
:rtype:
"""
logg.info(f'Active token set to: {token_symbol}')
key = cache_data_key(identifier=bytes.fromhex(blockchain_address), salt=MetadataPointer.TOKEN_ACTIVE)
cache_data(key=key, data=token_symbol)
def token_list_set(preferred_language: str, token_data_reprs: list):
"""
:param preferred_language:
:type preferred_language:
:param token_data_reprs:
:type token_data_reprs:
:return:
:rtype:
"""
if not token_data_reprs:
return translation_for('helpers.no_tokens_list', preferred_language)
return ''.join(f'{token_data_repr}\n' for token_data_repr in token_data_reprs)