class FabricWorkOrderImpl(WorkOrderProxy):
"""
This class provide work order management APIs which interact with
Fabric blockchain. Detail method description will be
available in WorkOrder interface
"""
def __init__(self, config):
"""
config is dict containing fabric specific parameters.
"""
self.__fabric_wrapper = None
# Chain code name
self.CHAIN_CODE = 'order'
self.WORK_ORDER_SUBMITTED_EVENT_NAME = 'workOrderSubmitted'
self.WORK_ORDER_COMPLETED_EVENT_NAME = 'workOrderCompleted'
self.WAIT_TIME = 30
self.__wo_resp = ''
if config is not None:
self.__fabric_wrapper = FabricWrapper(config)
else:
raise Exception("config is none")
def work_order_submit(self,
work_order_id,
worker_id,
requester_id,
work_order_request,
id=None):
"""
Submit work order request to fabric block chain.
Params
work_order_id is unique id of the work order request
worker_id is identifier for the worker
requester_id is unique id to identify the requester
work_order_request is json string work order request
defined in EEA specification 6.1.1.
Returns
0 on success and non zero on error.
"""
if (self.__fabric_wrapper is not None):
params = []
params.append(work_order_id)
params.append(worker_id)
params.append(requester_id)
params.append(work_order_request)
txn_status = self.__fabric_wrapper.invoke_chaincode(
self.CHAIN_CODE, 'workOrderSubmit', params)
return txn_status
else:
logging.error("Fabric wrapper instance is not initialized")
return ContractResponse.ERROR
def work_order_get_result(self, work_order_id, id=None):
"""
Function to query blockchain to get work order result.
Params
work_order_id is a Work Order id that was
sent in the corresponding work_order_submit request.
Returns
None on error, result on Success.
"""
# Calling the contract workOrderGet() will result in error
# work order id doesn't exist. This is because committing will
# take some time to commit to chain.
# Instead of calling contract api to get result chosen the
# event based approach.
event_handler = \
self.get_work_order_completed_event_handler(
self.handle_fabric_event)
if event_handler:
tasks = [
event_handler.start_event_handling(),
event_handler.stop_event_handling(int(self.WAIT_TIME))
]
loop = asyncio.get_event_loop()
loop.run_until_complete(
asyncio.wait(tasks, return_when=asyncio.ALL_COMPLETED))
loop.close()
return self.__wo_resp
else:
logging.info("Failed while creating event handler")
return None
def work_order_complete(self, work_order_id, work_order_response):
"""
This function is called by the Worker Service to
complete a Work Order successfully or in error.
This API is for proxy model.
params
work_order_id is unique id to identify the work order request
work_order_response is the Work Order response data in string
Returns
errorCode is a result of operation.
"""
if (self.__fabric_wrapper is not None):
if work_order_response is None:
logging.info("Work order response is empty")
return ContractResponse.ERROR
params = []
params.append(work_order_id)
params.append(work_order_response)
txn_status = self.__fabric_wrapper.invoke_chaincode(
self.CHAIN_CODE, 'workOrderComplete', params)
return txn_status
else:
logging.error("Fabric wrapper instance is not initialized")
return ContractResponse.ERROR
def encryption_key_start(self, tag):
"""
Function to initiate to set the encryption key of
worker.
"""
logging.error("This API is not supported")
return None
def encryption_key_get(self,
worker_id,
requester_id,
last_used_key_nonce=None,
tag=None,
signature_nonce=None,
signature=None):
"""
Function to worker's key from fabric block chain.
"""
logging.error("This API is not supported")
return None
def encryption_key_set(self, worker_id, encryption_key, encryption_nonce,
tag, signature):
"""
Function to set worker's encryption key.
"""
logging.error("This API is not supported")
return None
def get_work_order_submitted_event_handler(self, handler_func):
"""
Function to start event handler loop for
workOrderSubmitted event
params:
handler_func is call back function name as string
returns:
event handler object
"""
if (self.__fabric_wrapper is not None):
event_handler = self.__fabric_wrapper.get_event_handler(
self.WORK_ORDER_SUBMITTED_EVENT_NAME, self.CHAIN_CODE,
handler_func)
return event_handler
else:
logging.error("Fabric wrapper instance is not initialized")
return None
def get_work_order_completed_event_handler(self, handler_func):
"""
Function to start event handler loop for
workOrderCompleted event
params:
handler_func is call back function name as string
"""
if (self.__fabric_wrapper is not None):
event_handler = self.__fabric_wrapper.get_event_handler(
self.WORK_ORDER_COMPLETED_EVENT_NAME, self.CHAIN_CODE,
handler_func)
return event_handler
else:
logging.error("Fabric wrapper instance is not initialized")
return None
def handle_fabric_event(self, event, block_num, txn_id, status):
"""
callback function for fabric event handler
"""
payload = event['payload'].decode("utf-8")
resp = json.loads(payload)
self.__wo_resp = json.loads(resp["workOrderResponse"])
logging.debug("Work order response from event : {}".format(
self.__wo_resp))
class FabricWorkOrderImpl(WorkOrderProxy):
"""
This class provide work order management APIs which interact with
Fabric blockchain. Detail method description will be
available in WorkOrder interface
"""
def __init__(self, config):
"""
config is dict containing fabric specific parameters.
"""
self.__fabric_wrapper = None
# Chain code name
self.CHAIN_CODE = 'order'
self.WORK_ORDER_SUBMITTED_EVENT_NAME = 'workOrderSubmitted'
self.WORK_ORDER_COMPLETED_EVENT_NAME = 'workOrderCompleted'
if config is not None:
self.__fabric_wrapper = FabricWrapper(config)
else:
raise Exception("config is none")
def work_order_submit(self,
work_order_id,
worker_id,
requester_id,
work_order_request,
id=None):
"""
Submit work order request to fabric block chain.
Params
work_order_id is unique id of the work order request
worker_id is identifier for the worker
requester_id is unique id to identify the requester
work_order_request is json string work order request
defined in EEA specification 6.1.1.
Returns
0 on success and non zero on error.
"""
if (self.__fabric_wrapper is not None):
params = []
params.append(work_order_id)
params.append(worker_id)
params.append(requester_id)
params.append(work_order_request)
txn_status = self.__fabric_wrapper.invoke_chaincode(
self.CHAIN_CODE, 'workOrderSubmit', params)
if txn_status is True:
return 0
else:
return -1
else:
logging.error("Fabric wrapper instance is not initialized")
return -1
def work_order_get_result(self, work_order_id, id=None):
"""
Function to query blockchain to get work order result.
Params
work_order_id is a Work Order id that was
sent in the corresponding work_order_submit request.
Returns
-1 on error, result on Success.
"""
if (self.__fabric_wrapper is not None):
params = []
params.append(work_order_id)
work_order_result = self.__fabric_wrapper.invoke_chaincode(
self.CHAIN_CODE, 'workOrderGetResult', params)
if work_order_result is not None:
return work_order_result
else:
return -1
else:
logging.error("Fabric wrapper instance is not initialized")
return -1
def work_order_complete(self, work_order_id, work_order_response):
"""
This function is called by the Worker Service to
complete a Work Order successfully or in error.
This API is for proxy model.
params
work_order_id is unique id to identify the work order request
work_order_response is the Work Order response data in string
Returns
errorCode is a result of operation.
"""
if (self.__fabric_wrapper is not None):
if work_order_response is None:
logging.info("Work order response is empty")
return -1
params = []
params.append(work_order_id)
params.append(work_order_response)
txn_status = self.__fabric_wrapper.invoke_chaincode(
self.CHAIN_CODE, 'workOrderComplete', params)
if txn_status is True:
return 0
else:
return -1
else:
logging.error("Fabric wrapper instance is not initialized")
return -1
def encryption_key_start(self, tag):
"""
Function to initiate to set the encryption key of
worker.
"""
logging.error("This API is not supported")
return None
def encryption_key_get(self,
worker_id,
requester_id,
last_used_key_nonce=None,
tag=None,
signature_nonce=None,
signature=None):
"""
Function to worker's key from fabric block chain.
"""
logging.error("This API is not supported")
return None
def encryption_key_set(self, worker_id, encryption_key, encryption_nonce,
tag, signature):
"""
Function to set worker's encryption key.
"""
logging.error("This API is not supported")
return None
def get_work_order_submitted_event_handler(self, handler_func):
"""
Function to start event handler loop for
workOrderSubmitted event
params:
handler_func is call back function name as string
returns:
event handler object
"""
if (self.__fabric_wrapper is not None):
event_handler = self.__fabric_wrapper.get_event_handler(
self.WORK_ORDER_SUBMITTED_EVENT_NAME, self.CHAIN_CODE,
handler_func)
return event_handler
else:
logging.error("Fabric wrapper instance is not initialized")
return None
def get_work_order_completed_event_handler(self, handler_func):
"""
Function to start event handler loop for
workOrderCompleted event
params:
handler_func is call back function name as string
"""
if (self.__fabric_wrapper is not None):
event_handler = self.__fabric_wrapper.get_event_handler(
self.WORK_ORDER_COMPLETED_EVENT_NAME, self.CHAIN_CODE,
handler_func)
return event_handler
else:
logging.error("Fabric wrapper instance is not initialized")
return None