def insert_transaction(cnx, client, gpg, contract_id, transaction_data, recipients):
contract_dir = 'contract_files/' + contract_id
update_timestamp = get_timestamp()
if not os.path.isdir(contract_dir):
os.mkdir(path=contract_dir)
fname = contract_dir + '/' + update_timestamp + '.txt'
# write transaction data to json
with open(fname, 'wb') as outfile:
json.dump(transaction_data, outfile)
# encrypt
output_filename = contract_dir + '/' + update_timestamp + '_enc.gpg'
with open(fname, 'rb') as f:
status = gpg.encrypt_file(f, recipients=recipients, output=output_filename)
# send via IPFS
res = client.add(output_filename)
ipfs_hash_sent = res['Hash']
print(ipfs_hash_sent)
cur = cnx.cursor()
query_str = 'INSERT INTO transaction_pool (contract_id, txn_hash) VALUES(\'' + contract_id + '\', \'' + ipfs_hash_sent + '\');'
cur.execute(query_str)
cnx.commit()
return ipfs_hash_sent
def submit_invoice(self, invoice_file_name, invoice_hash):
if self.user_role == 'engineer':
raise NameError('Only technicians can submit invoices')
exists, current_state = blockchain.contract_exists(
self.blockchain.cnx, self.contract_id)
if exists is False:
raise NameError(
'Invalid state transition - contract must be deployed first')
self.contract_header = blockchain.download_contract_header(
self.blockchain.cnx, self.contract_id)
if self.contract_header[
'current_state'] is not 'Post Processing Submitted':
print(
'Warning - post processing procedure has not been submitted yet'
)
last_update_timestamp = get_timestamp()
self.contract_header['current_state'] = 'Invoice Submitted'
self.contract_header['last_update_timestamp'] = last_update_timestamp
transaction_data = {
'transaction_timestamp': last_update_timestamp,
'filename': invoice_file_name,
'invoice_hash': invoice_hash
}
block_added = self.refresh(transaction_data, last_update_timestamp)
print('Transaction block added to blockchain at ',
self.blockchain.ledger_path, '\n', block_added)
return block_added
def submit_post_processing_procedure(self, post_processing_procedure):
if self.user_role == 'technician':
raise NameError(
'Only engineers can submit post processing procedures')
exists, current_state = blockchain.contract_exists(
self.blockchain.cnx, self.contract_id)
if exists is False:
raise NameError(
'Invalid state transition - contract must be deployed first')
self.contract_header = blockchain.download_contract_header(
self.blockchain.cnx, self.contract_id)
if self.contract_header[
'current_state'] is not 'Build Report Submitted':
print('Warning - build report has not been submitted yet')
last_update_timestamp = get_timestamp()
self.contract_header['current_state'] = 'Post Processing Submitted'
self.contract_header['last_update_timestamp'] = last_update_timestamp
transaction_data = {
'transaction_timestamp': last_update_timestamp,
'post_processing_procedure': post_processing_procedure
}
block_added = self.refresh(transaction_data, last_update_timestamp)
print('Transaction block added to blockchain at ',
self.blockchain.ledger_path, '\n', block_added)
return block_added
def submit_powder(self, powder_id):
if self.user_role == 'engineer':
raise NameError('Only technicians can submit powder')
exists, current_state = blockchain.contract_exists(
self.blockchain.cnx, self.contract_id)
if exists is False:
raise NameError(
'Invalid state transition (contract does not exist) - contract must be deployed first'
)
self.contract_header = blockchain.download_contract_header(
self.blockchain.cnx, self.contract_id)
last_update_timestamp = get_timestamp()
print(self.contract_header['current_state'])
self.contract_header['current_state'] = 'Powder Selected'
self.contract_header['last_update_timestamp'] = last_update_timestamp
transaction_data = {
'transaction_timestamp': last_update_timestamp,
'powder_id': powder_id
}
block_added = self.refresh(transaction_data, last_update_timestamp)
print('Transaction block added to blockchain at ',
self.blockchain.ledger_path, '\n', block_added)
return block_added
def deploy_contract(self,
project_name,
engineer_email,
engineer_name,
technician_email,
technician_name,
build_file_name,
build_file_hash,
comments=None,
oracle_string=None):
# only engineers can deploy a new contract?
if self.user_role is 'technician':
raise NameError('Only engineers can submit new contracts')
# check if contract id already exists
exists, current_state = blockchain.contract_exists(
self.blockchain.cnx, self.contract_id)
if exists:
raise NameError(
'Contract with this contract id has already been deployed. Retry with new contract id or try a different function'
)
# self.blockchain = self.blockchain.load_blockchain()
# create contract header when deploying. This cannot be changed later
deployment_timestamp = get_timestamp()
last_update_timestamp = deployment_timestamp
self.contract_header['deployment_timestamp'] = deployment_timestamp
self.contract_header['last_update_timestamp'] = last_update_timestamp
self.contract_header['current_state'] = 'Contract Submitted'
self.contract_header['project_name'] = project_name
self.contract_header['engineer_email'] = engineer_email
self.contract_header['engineer_name'] = engineer_name
self.contract_header['technician_email'] = technician_email
self.contract_header['technician_name'] = technician_name
# transaction data is specific to this transaction
transaction_data = {
'transaction_timestamp': get_timestamp(),
'filename': build_file_name,
'build_file_hash': build_file_hash,
'comments': comments,
'oracle_string': oracle_string
}
blockchain.upload_contract_header(
self.blockchain.cnx, self.contract_id, deployment_timestamp,
project_name, engineer_email, technician_email,
last_update_timestamp, self.contract_header['current_state'])
block_added = self.refresh(transaction_data, last_update_timestamp)
return block_added
def submit_build_report(self, build_report_file_name, build_report_hash):
if self.user_role == 'engineer':
raise NameError('Only technicians can submit build reports')
exists, current_state = blockchain.contract_exists(self.blockchain.cnx, self.contract_id)
if exists is False:
raise NameError('Invalid state transition - contract must be deployed first')
self.contract_header = blockchain.download_contract_header(self.blockchain.cnx, self.contract_id)
if self.contract_header['current_state'] is not 'Powder Submitted':
print('Warning - powder has not been submitted yet')
last_update_timestamp = get_timestamp()
self.contract_header['current_state'] = 'Build Report Submitted'
self.contract_header['last_update_timestamp'] = last_update_timestamp
transaction_data = {
'current_state': self.contract_header['current_state'],
'transaction_timestamp': last_update_timestamp,
'filename': build_report_file_name,
'build_report_hash': build_report_hash
}
block_added = self.refresh(transaction_data, last_update_timestamp, self.contract_header['current_state'])
return block_added