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app.py
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app.py
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from flask import Flask, render_template, url_for, request, redirect, flash, session
import sys, math
import web3
from web3 import Web3
from solc import compile_source
from web3.contract import ConciseContract
from NeuralEngine.Predictor import *
app = Flask(__name__)
# Blockchain part #
# Run-only-once-in-the-start part begins
src = open('P2PLending.sol')
src = "\n".join(list(line.replace("\n", "") for line in src))
print("Contract Code Loaded")
w3provider = Web3(web3.providers.rpc.HTTPProvider("http://localhost:8545"))
compiled_sol = compile_source(src)
contract_interface = compiled_sol['<stdin>:P2PLending']
P2PLending_contract = w3provider.eth.contract(abi=contract_interface['abi'], bytecode=contract_interface['bin'])
tx_hash = P2PLending_contract.deploy(transaction={'from': w3provider.eth.accounts[0], 'gas': 4100000})
tx_receipt = w3provider.eth.getTransactionReceipt(tx_hash)
contract_address = tx_receipt['contractAddress']
print("Contract is deployed at the address ", contract_address)
contract_read_interface = w3provider.eth.contract(contract_interface['abi'], contract_address,
ContractFactoryClass=ConciseContract)
contract_txn_interface = P2PLending_contract(contract_address)
# Run-only-once-in-the-start part ends
src = open('P2PLending.sol')
src = "\n".join(list(line.replace("\n", "") for line in src))
print("Contract Code Loaded")
w3provider = Web3(web3.providers.rpc.HTTPProvider("http://localhost:8545"))
compiled_sol = compile_source(src)
contract_interface = compiled_sol['<stdin>:P2PLending']
P2PLending_contract = w3provider.eth.contract(abi=contract_interface['abi'], bytecode=contract_interface['bin'])
tx_hash = P2PLending_contract.deploy(transaction={'from': w3provider.eth.accounts[0]})
tx_receipt = w3provider.eth.getTransactionReceipt(tx_hash)
contract_address = tx_receipt['contractAddress']
print("Contract is deployed at the address ", contract_address)
contract_read_interface = w3provider.eth.contract(contract_interface['abi'], contract_address,
ContractFactoryClass=ConciseContract)
contract_txn_interface = P2PLending_contract(contract_address)
# Run-only-once-in-the-start part ends
def create_account(password, name, borrower):
account_address = w3provider.personal.newAccount(password)
# Give some ether to fund gas for txns
w3provider.eth.sendTransaction(
{'from': w3provider.eth.accounts[0], 'to': account_address, 'value': 50000000})
# Unlock for 3 seconds to run the create<User> Txns
w3provider.personal.unlockAccount(account_address, password, 3)
if borrower == "True":
contract_txn_interface.transact({'from': account_address}).createBorrower(name)
else:
contract_txn_interface.transact({'from': account_address}).createInvestor(name)
return account_address
def login(account_address, password):
# TODO: Store address in session variable
try:
w3provider.personal.unlockAccount(account_address, password, 3600)
is_borrower = contract_read_interface.isBorrower(account_address)
is_investor = contract_read_interface.isInvestor(account_address)
if is_borrower:
return [True, "borrower"]
elif is_investor:
return [True, "investor"]
else:
return [False, "INVALID"]
except:
return [False, None]
def logout(account_address):
try:
web3.personal.lockAccount(account_address)
# TODO: Destroy the session variable that stores the address
return True
except:
return False
def check_balance(account_address):
# TODO: On login, save account_address to global, maybe?
return contract_txn_interface.call({'from': account_address}).viewBalance()
def withdraw(account_address, amount):
try:
contract_txn_interface.transact({'from': account_address}).withdraw(int(amount))
return True
except:
return False
def deposit(account_address, amount):
contract_txn_interface.transact({'from': account_address}).deposit(int(amount))
return True
def squishify(*args, **kwargs):
name = kwargs['name']
age = kwargs['age']
job = kwargs['job']
gender = kwargs['gender']
marr_status = kwargs['marr_status']
liab = kwargs['liab']
housing = kwargs['housing']
res_since = kwargs['res_since']
status_ca = kwargs['status_ca']
duration = kwargs['duration']
purpose = kwargs['purpose']
cred_amt = kwargs['cred_amt']
sav_act = kwargs['sav_act']
emp_since = kwargs['emp_since']
inst_rate = kwargs['inst_rate']
debtors = kwargs['debtors']
_property = kwargs['_property']
plans = kwargs['plans']
exist_cred = kwargs['exist_cred']
phone = kwargs['phone']
foreign = kwargs['foreign']
category = kwargs['category']
confidence = kwargs['confidence']
history = kwargs['history']
return "~".join([name, age, job, gender, marr_status, liab, housing, res_since, status_ca, duration, purpose,
cred_amt, sav_act, emp_since, inst_rate, debtors, _property, plans, exist_cred, phone, foreign,
category, confidence, history])
def desquishify(compressed_string):
s = compressed_string.split('~')
return {
'name': s[0], 'age': s[1], 'job': s[2],
'gender': s[3], 'marr_status': s[4], 'liab': s[5],
'housing': s[6], 'res_since': s[7], 'status_ca': s[8],
'duration': s[9], 'purpose': s[10], 'cred_amt': s[11],
'sav_act': s[12], 'emp_since': s[13], 'inst_rate': s[14],
'debtors': s[15], '_property': s[16], 'plans': s[17],
'exist_cred': s[18], 'phone': s[19], 'foreign': s[20],
'category': s[21], 'confidence': s[22], 'history': s[23]
}
def create_application(account_address, duration, interest_rate, credit_amount, otherData):
try:
contract_txn_interface.transact({'from': account_address}) \
.createApplication(int(duration), int(interest_rate), int(credit_amount), otherData)
return True
except:
return False
def get_num_applications():
return contract_txn_interface.call({'from': w3provider.eth.accounts[0]}).getNumApplications()
def get_num_loans():
return contract_txn_interface.call({'from': w3provider.eth.accounts[0]}).getNumLoans()
def view_open_applications():
open_applications = []
n = get_num_applications()
for i in range(1, n + 1):
is_open = contract_read_interface.ifApplicationOpen(i)
if is_open:
raw_data = contract_read_interface.getApplicationData(i)
open_applications.append({
'application_id': raw_data[0][0],
'duration': raw_data[0][1],
'amount': raw_data[0][2],
'interest_rate': raw_data[0][3],
# TODO: De-squishify other data
'other_data': raw_data[1],
'borrower': raw_data[2]
})
return open_applications
def view_open_applications():
open_applications = []
n = get_num_applications()
for i in range(1, n + 1):
is_open = contract_read_interface.ifApplicationOpen(i)
if is_open:
raw_data = contract_read_interface.getApplicationData(i)
other_data = desquishify(raw_data[1])
open_applications.append({
'application_id': raw_data[0][0],
'duration': raw_data[0][1],
'amount': raw_data[0][2],
'interest_rate': raw_data[0][3],
'name': other_data['name'],
'purpose': other_data['purpose'],
'job': other_data['job'],
'age': other_data['age'],
'category': other_data['category'],
'confidence': other_data['confidence'],
'borrower': raw_data[2]
})
return open_applications
def grant_loan(account_address, app_id):
try:
contract_txn_interface.transact({'from': account_address}).grantLoan(int(app_id))
return True
except:
return False
def view_my_loan(account_address, userType):
if userType == "borrower":
n = get_num_loans()
for i in range(1, n + 1):
is_open = contract_read_interface.ifLoanOpen(i)
if is_open:
raw_data = contract_read_interface.getLoanData(i)
if raw_data[1].lower() == account_address.lower():
return {
'loan_id': raw_data[0][0],
'interest_rate': raw_data[0][1],
'duration': raw_data[0][2],
'principal_amount': raw_data[0][3],
'original_amount': raw_data[0][4],
'paid_amount': raw_data[0][5],
'start_time': raw_data[0][6],
'monthly_checkpoint': raw_data[0][7],
'application_id': raw_data[0][8],
'borrower': raw_data[1],
'investor': raw_data[2]
}
return False
elif userType == "investor":
n = get_num_loans()
for i in range(1, n + 1):
is_open = contract_read_interface.ifLoanOpen(i)
if is_open:
raw_data = contract_read_interface.getLoanData(i)
if raw_data[2].lower() == account_address.lower():
return {
'loan_id': raw_data[0][0],
'interest_rate': raw_data[0][1],
'duration': raw_data[0][2],
'principal_amount': raw_data[0][3],
'original_amount': raw_data[0][4],
'paid_amount': raw_data[0][5],
'start_time': raw_data[0][6],
'monthly_checkpoint': raw_data[0][7],
'application_id': raw_data[0][8],
'borrower': raw_data[1],
'investor': raw_data[2]
}
return False
else:
return False
def estimate_interest(account_address, userType):
# Select how fast you want time to move
TIME_STEP = {'seconds': 1, 'minutes': 60, 'hours': 3600, 'days': 3600 * 24, 'months': 3600 * 24 * 30}
if userType == "investor":
return False
else:
loan_data = view_my_loan(account_address, userType)
if loan_data != False:
p = loan_data['principal_amount']
r = loan_data['interest_rate']
checkpoint = loan_data['monthly_checkpoint']
start_time = loan_data['start_time']
n = 12 # n is the number of times interest is compounded annually
amount_with_interest = p
# Note that this time is not the actual time, but a timestamp in num_of_seconds
current_time = contract_read_interface.getTime()
time_elapsed = (current_time - start_time) / TIME_STEP['seconds']
t_since_last_payment = time_elapsed - checkpoint
print(current_time, "Current Time")
print(start_time, "Start time")
print(checkpoint, "Checkpoint")
print(time_elapsed, "Time elapsed")
if t_since_last_payment != 0:
amount_with_interest = p * (1 + r / (100 * n)) ** (time_elapsed)
amount_with_interest = int(amount_with_interest)
return [int(amount_with_interest), int(t_since_last_payment)]
else:
return [int(p), 0]
def repay_loan(account_address, amount):
try:
amount_with_interest, months_since_last_checkpoint = estimate_interest(account_address, 'borrower')
amount = int(amount) # Typecast for safety B|
contract_txn_interface.transact({'from': account_address}) \
.repayLoan(amount, amount_with_interest, months_since_last_checkpoint)
return True
except:
return False
def view_application_by_id(index):
n = get_num_applications()
if index > n or index < 1:
return False
else:
raw_data = contract_read_interface.getApplicationData(index)
return desquishify(raw_data[1])
def view_loan_by_id(index):
n = get_num_loans()
if index > n or index < 1:
return False
else:
raw_data = contract_read_interface.getLoanData(index)
return {
'loan_id': raw_data[0][0],
'interest_rate': raw_data[0][1],
'duration': raw_data[0][2],
'principal_amount': raw_data[0][3],
'original_amount': raw_data[0][4],
'paid_amount': raw_data[0][5],
'start_time': raw_data[0][6],
'monthly_checkpoint': raw_data[0][7],
'application_id': raw_data[0][8],
'borrower': raw_data[1],
'investor': raw_data[2]
}
def get_full_blockchain():
n = w3provider.eth.blockNumber
blocks_with_txns = []
for i in range(10):
block = w3provider.eth.getBlock(i)
blocks_with_txns.append(block)
return blocks_with_txns
def view_my_txns_from_blockchain(account_address):
n = w3provider.eth.blockNumber
print(n, "Blocks in the blockchain")
output = []
for block_num in range(n):
txn_count = w3provider.eth.getBlockTransactionCount(block_num)
for i in range(txn_count):
raw_data = dict(w3provider.eth.getTransactionFromBlock(block_num, i))
if raw_data['from'].lower() == account_address.lower() or raw_data['to'].lower() == account_address.lower():
output.append({
'from': raw_data['from'],
'to': raw_data['to'],
'blockNumber': raw_data['blockNumber'],
'hash': raw_data['hash']
})
return output
# TODO: Remove this test script later
# add = create_account("foo", "foo", borrower="True")
# print(login(add, "foo"))
# print("Login done")
# print("Creating application", create_application(add, 10, 1, 100, squishify(name='Alisha', age='21', job='wtf',
# gender='f', marr_status='blh', liab='hh',
# housing='ff', res_since='fff',
# status_ca='dd', duration='222',
# purpose='education', cred_amt='2255',
# sav_act='44444', emp_since='5',
# inst_rate='11', debtors='2',
# _property='fds',
# plans='22', exist_cred='9', phone='yes',
# foreign='no')))
@app.route("/")
def main():
return render_template('index.html')
@app.route("/signup/", methods=['GET', 'POST'])
def signup():
if request.method == 'POST':
# Sign Up
if request.form['btn'] == 'Sign Up':
name = request.form['su_name']
password = request.form['su_password']
borrower = request.form['client_type'] # False for investors, True for borrowers
account_address = create_account(password, name, borrower)
return render_template('signup.html', account_address=account_address)
# Login
else:
account_address = request.form['l_acc_add']
password = request.form['l_password']
success, client_type = login(account_address, password)
if success:
session['logged_in'] = True
session['account_address'] = account_address
session['client_type'] = client_type
return (redirect(url_for('inv_dashboard_open_apps'))) if client_type == 'investor' else (
redirect(url_for('appl_dashboard_new_app')))
else:
return render_template('signup.html', error_l_pass="Invalid credentials.")
return render_template('signup.html', account_address=None)
@app.route("/signout/")
def signout():
logout(session['account_address'])
session.clear()
return redirect(url_for('main'))
@app.route("/inv_dashboard/open_apps/")
def inv_dashboard_open_apps():
apps = view_open_applications()
napps = len(apps)
to_hide = 0
if napps % 3 == 1: # get number of blank cards
to_hide = 2
elif napps % 3 == 2:
to_hide = 1
ndecks = math.ceil(napps / 3) # for 3 cards per deck
return render_template('inv_dashboard.html', apps=apps, ndecks=ndecks, to_hide=to_hide, tab='open_apps')
@app.route("/inv_dashboard/profile/", methods=['GET', 'POST'])
def inv_dashboard_profile():
if request.method == 'POST':
# Deposit
if request.form['transactBtn'] == 'Deposit':
success = deposit(session['account_address'], request.form['deposit_amt'])
msg = 'Transaction successful' if success else 'Transaction failed'
balance = check_balance(session['account_address'])
return render_template('inv_dashboard.html', balance=balance, tab='profile', deposit_msg=msg)
# Withdraw
else:
success = withdraw(session['account_address'], request.form['withdraw_amt'])
msg = 'Transaction successful' if success else 'Transaction failed'
balance = check_balance(session['account_address'])
return render_template('inv_dashboard.html', balance=balance, tab='profile', withdraw_msg=msg)
return render_template('inv_dashboard.html', balance=check_balance(session['account_address']), tab='profile')
@app.route("/inv_dashboard/my_loan/", methods=['GET', 'POST'])
def inv_dashboard_my_loan():
loan = view_my_loan(session['account_address'], session['client_type'])
if not loan:
loan = ""
return render_template('inv_dashboard.html', loan=loan, tab='my_loan')
@app.route("/view_app/", methods=['GET', 'POST'])
def view_app():
app_id = int(request.args.get('app_id', None))
app = view_application_by_id(app_id)
if request.method == 'POST':
success = grant_loan(session['account_address'], app_id)
if success:
return redirect(url_for('inv_dashboard_my_loan', tab='my_loan'))
else:
return render_template('view_app.html', app=app)
return render_template('view_app.html', app=app)
@app.route("/appl_dashboard/new_app", methods=['GET', 'POST'])
def appl_dashboard_new_app():
if request.method == 'POST':
# mapping from 0, 1, 2 to actual value
jobs = {'A171': 'Unemployed/ Unskilled - non-resident', 'A172': 'Unskilled - resident',
'A173': 'Skilled employee / Official',
'A174': 'Management/ Self-employed/ Highly qualified employee/ Officer'}
genders = {'0': 'Male', '1': 'Female'}
marr_statuses = {'1': 'Married', '2': 'Single', '3': 'Divorced/ Separated', '4': 'Widowed'}
housings = {'A151': 'Rent', 'A152': 'Own', 'A153': 'For free'}
status_cas = {'A11': 'Less than 0', 'A12': 'Between 0 and 200', 'A13': 'More than 200',
'A14': 'No checking account'}
purposes = {'A40': 'Car (new)', 'A41': 'Car (used)', 'A42': 'Furniture/ Equipment', 'A43': 'Radio/ Television',
'A44': 'Domestic appliances', 'A45': 'Repairs', 'A46': 'Education',
'A48': 'Retraining', 'A49': 'Business', 'A410': 'Others'}
sav_acts = {'A61': 'Less than 100', 'A62': 'Between 100 and 500', 'A63': 'Between 500 and 1000',
'A64': 'More than 1000', 'A65': 'Unknown/ No savings account'}
emp_sinces = {'A71': 'Unemployed', 'A72': 'Less than 1 year', 'A73': 'Between 1 and 4 years',
'A74': 'Between 4 and 7 years', 'A75': 'More than 7 years'}
debtorss = {'A101': 'None', 'A102': 'Co-applicant', 'A103': 'Guarantor'}
propertys = {'A121': 'Real estate', 'A122': 'Life Insurance', 'A123': 'Car or other',
'A124': 'Unknown/ No property'}
planss = {'A141': 'Bank', 'A142': 'Stores', 'A143': 'None'}
phones = {'A191': 'Yes, under my name', 'A192': 'No'}
foreigns = {'A201': 'Yes', 'A202': 'No'}
historys = {'A30': 'No credits taken', 'A31': 'All credits paid back duly',
'A32': 'Existing credits paid back duly till now', 'A33': 'Delay in paying off in the past',
'A34': 'Critical account'}
status_sex = ''
if request.form['gender'] == '0' and request.form['marr_status'] == '3':
status_sex = 'A91'
elif request.form['gender'] == '1' and (
request.form['marr_status'] == '3' or request.form['marr_status'] == '1'):
status_sex = 'A92'
elif request.form['gender'] == '0' and request.form['marr_status'] == '2':
status_sex = 'A93'
elif request.form['gender'] == '0' and (
request.form['marr_status'] == '4' or request.form['marr_status'] == '1'):
status_sex = 'A94'
elif request.form['gender'] == '1' and request.form['marr_status'] == '2':
status_sex = 'A92'
else:
status_sex = 'A92'
name = request.form['name']
age = request.form['age']
job = jobs[request.form['job']]
gender = genders[request.form['gender']]
marr_status = marr_statuses[request.form['marr_status']]
liab = request.form['liab']
housing = housings[request.form['housing']]
res_since = request.form['res_since']
status_ca = status_cas[request.form['status_ca']]
duration = request.form['duration']
purpose = purposes[request.form['purpose']]
cred_amt = request.form['cred_amt']
sav_act = sav_acts[request.form['sav_act']]
emp_since = emp_sinces[request.form['emp_since']]
inst_rate = request.form['inst_rate']
debtors = debtorss[request.form['debtors']]
_property = propertys[request.form['property']]
plans = planss[request.form['plans']]
exist_cred = request.form['exist_cred']
phone = phones[request.form['phone']]
foreign = foreigns[request.form['foreign']]
history = historys[request.form['history']]
predictor = Predictor()
print("NN Processing")
raw_op = predictor.predict(status_of_account=request.form['status_ca'], duration=request.form['duration'],
history=request.form['history'],
purpose=request.form['purpose'], amount=request.form['cred_amt'],
saving_bonds=request.form['sav_act'],
employment=request.form['emp_since'], rate=request.form['inst_rate'],
status_sex=status_sex, other_coap=request.form['debtors'],
resi_since=request.form['res_since'],
property=request.form['property'], age=request.form['age'],
other_plans=request.form['plans'],
housing=request.form['housing'],
existing_credits=request.form['exist_cred'],
job=request.form['job'], liability=request.form['liab'],
telephone=request.form['phone'],
foreign=request.form['foreign'])
print("Raw output from NN", raw_op)
otherData = squishify(name=name, age=age, job=job, gender=gender, marr_status=marr_status,
liab=liab, housing=housing, res_since=res_since, status_ca=status_ca,
duration=duration, purpose=purpose, cred_amt=cred_amt,
sav_act=sav_act, emp_since=emp_since, inst_rate=inst_rate, debtors=debtors,
_property=_property, plans=plans, exist_cred=exist_cred, phone=phone, foreign=foreign,
category=raw_op['category'], confidence=str(raw_op['confidence']), history=history)
success = create_application(session['account_address'], int(duration), int(inst_rate), int(cred_amt),
otherData)
if success:
return render_template('appl_dashboard.html', balance=check_balance(session['account_address']), tab='profile')
return render_template('appl_dashboard.html', tab='new_app')
return render_template('appl_dashboard.html', tab='new_app')
@app.route("/appl_dashboard/profile/", methods=['GET', 'POST'])
def appl_dashboard_profile():
if request.method == 'POST':
# Deposit
if request.form['transactBtn'] == 'Deposit':
success = deposit(session['account_address'], request.form['deposit_amt'])
msg = 'Transaction successful' if success else 'Transaction failed'
balance = check_balance(session['account_address'])
return render_template('appl_dashboard.html', balance=balance, tab='profile', deposit_msg=msg)
# Withdraw
else:
success = withdraw(session['account_address'], request.form['withdraw_amt'])
msg = 'Transaction successful' if success else 'Transaction failed'
balance = check_balance(session['account_address'])
return render_template('appl_dashboard.html', balance=balance, tab='profile', withdraw_msg=msg)
return render_template('appl_dashboard.html', balance=check_balance(session['account_address']), tab='profile')
@app.route("/appl_dashboard/my_loan", methods=['GET', 'POST'])
def appl_dashboard_my_loan():
loan = view_my_loan(session['account_address'], session['client_type'])
if not loan:
loan = ""
# TODO: Display History in view application
amount_with_interest, t_since_last_pay = estimate_interest(session['account_address'], session['client_type'])
if request.method == 'POST':
success = repay_loan(session['account_address'], request.form['amount'])
if success:
msg = 'Transaction successful'
return render_template('appl_dashboard.html', loan=loan, msg=msg, amount_with_interest=amount_with_interest, t_since_last_pay=t_since_last_pay, tab='my_loan')
else:
msg = 'Transaction failed'
return render_template('appl_dashboard.html', loan=loan, msg=msg, amount_with_interest=amount_with_interest, t_since_last_pay=t_since_last_pay, tab='my_loan')
return render_template('appl_dashboard.html', amount_with_interest=amount_with_interest, t_since_last_pay=t_since_last_pay, loan=loan, tab='my_loan')
app.secret_key = 'A0Zr98j/3yX R~XHH!jmN]LWX/,?RT'
if __name__ == "__main__":
app.run(debug=True)